Abstract: An age hardenable martensitic steel alloy having a unique combination of very high strength and good toughness consists essentially of, in weight percent, about______________________________________ C 0.21-0.34 Mn 0.20 max. Si 0.10 max. P 0.008 max. S 0.003 max. Cr 1.5-2.80 Mo 0.90-1.80 Ni 10-13 Co 14.0-22.0 Al 0.1 max. Ti 0.05 max. Ce 0.030 max. La 0.010 max. ______________________________________the balance essentially iron. In addition, cerium and sulfur are balanced so that the ratio Ce/S is at least about 2 and not more than about 15. A small but effective amount of calcium can be present in place of some or all of the cerium and lanthanum.

Abstract: Steel for the manufacture of molds for injection molding of plastics, wherein its chemical composition contains, by weight: 0.35%.ltoreq.C.ltoreq.0.5%, 0%.ltoreq.Si.ltoreq.0.5%, 0.2%.ltoreq.Mn.ltoreq.2.5%, 0%.ltoreq.Ni.ltoreq.4%, 0%.ltoreq.Cr.ltoreq.4%, 0%.ltoreq.Mo+W/2.ltoreq.2%, 0%.ltoreq.Cu.ltoreq.1%, 0%.ltoreq.V+Nb/2+Ta/4.ltoreq.0.5%, 0.005%.ltoreq.Al.ltoreq.0.2%, 0%.ltoreq.B.ltoreq.0.015%, 0%.ltoreq.Ti+Zr/2.ltoreq.0.3%, 0%.ltoreq.S+Se+Te .ltoreq.0.2%, 0%.ltoreq.Pb+Bi.ltoreq.0.2%, 0%.ltoreq.Ca.ltoreq.0.1%, the remainder being iron and impurities resulting from the production, the analysis simultaneously satisfying the following relationships: Cr+3.times.(Mo+W/2)+10.times.(V+Nb/2+Ta/4).gtoreq.1, R=3.8.times.C+10.times.Si+3.3.times.Mn+2.4.times.Ni+1.4.times.(Cr+Mo+W/2). ltoreq.11, Qu=3.8.times.C+1.1.times.Mn+0.7.times.Ni+0.6.times.Cr+1.6.times.(Mo+W/2)+k B.gtoreq.3, with kB=0.5 if B.gtoreq.0.0005% and kB=0 if not, and: R.ltoreq.Max(2.33.times.Qu-1, 0.9.times.Qu+4).

Abstract: The present invention has an object to provide a steel for a chimney or a gas duct, which is excellent in pitting resistance and rust adhesion in a corrosive environment caused by combustion waste gas in a plant in which the combustion of natural gas occurs. Pitting resistance and rust adhesion are remarkably improved in the steel of the present invention which steel is prepared by using a 5% Cr steel as the base, while reducing an impurity sulfur to not more than 0.010 wt. %, adding titanium within a range of 0.005 to 0.05 wt. %, and further adding nickel alone within a range of 1.0 to 2.5 wt. %, or adding molybdenum alone within a range of 0.10 to 1.0 wt. %, or adding in combination therewith trace amount of copper or molybdenum within a range of 0.10 to 1.0 wt. %.

Abstract: This invention provides low-Cr ferritic steels and low-Cr ferritic cast steels having excellent high-temperature strength and weldability. These low-Cr ferritic steels and low-Cr ferritic cast steels consist essentially of, on a weight percentage basis, 0.03 to 0.12% C, 0.05 to 0.7% Si, 0.05 to 1% Mn, 0.002 to 0.025% P, 0.001 to 0.015% S, 0.3 to 3% Cr, 0.01 to 1% Ni, 0.05 to 3% Mo, 0.01 to 0.5% V, 0.1 to 3% W, 0.01 to 0.2% Nb, 0.02 to 1.5% Re, 0.003 to 0.05% Al, 0.0001 to 0.01% B, 0.003 to 0.03% N, and the balance being Fe and incidental impurities, and have excellent high-temperature strength and weldability.

Abstract: There is disclosed a bearing member which is enhanced in toughness without lowering the hardness of a core portion so as to prevent an instantaneous rupture of the bearing member, and is excellent in rolling fatigue service life characteristics. Martensitic Fe-based bearing steel of the invention contains, by weight, not more than 0.4% carbon, not more than 2% silicon, not more than 2% manganese, not more than 5% nickel, 3.5 to 7.0% chromium, at least one of tungsten and molybdenum an tungsten equivalent defined by (?W!+2?Mo!) of which at least one is 3 to 15%, and not less than 0.5% but less than 1.1% vanadium. A ratio of Cv/Ceq is not more than 0.3 where Cv represents a carbon equivalent of vanadium defined by 0.2?V!, and Ceq represents a carbon equivalent of carbide-forming elements defined by (0.063?Cr!+0.06?Mo!+0.033?W!+0.2?V!). With this construction, the precipitation of MC carbides is suppressed, and M.sub.

Abstract: A steam turbine in which principal components to be exposed to high temperatures are all made of ferritic steel, whereby the temperatures of main steam and reheat steam can be increased to 610-660 (.degree.C.). The rotor shaft (23 in FIG. 1) of the steam turbine is made of ferritic forged steel whose 100,000-hour creep rupture strength is at least 15 (kg/mm.sup.2) at the service temperature of the rotor shaft. Likewise, the casing (18) is made of ferritic cast steel whose 100,000-hour creep rupture strength is at least 10 (kg/mm.sup.2). The steam turbine of high thermal efficiency can be applied to a steam-turbine power plant.

Abstract: Steel for forming a gear by carburizing and quenching consisting essentially of: 0.1 to 0.35 wt. % C, 0.5 to 2.5 wt. % Si, 0.2 to 2.5 wt. % Mn, 0.01 to 2.5 wt. % Cr, 0.01 to 0.7 wt. % Mo, and the balance being Fe and inevitable impurities. The steel has an Ac.sub.3 point parameter (Ac.sub.3) and an ideal critical diameter (D.sub.I), the Ac.sub.3 point parameter being in a range of 850.degree. to 960 .degree. C., the ideal critical diameter (D.sub.I) being in a range of 30 to 250 mm, and the Ac.sub.3 point parameter (Ac.sub.3) and the ideal critical diameter (D.sub.I) being defined by the following equations.Ac.sub.3 =920-203.sqroot.C+44.7 Si+31.5.times.Mo-30.times.Mn-11.times.CrD.sub.I =7.95.sqroot.C(1+0.70.times.Si) (1+3.3.times.Mn)(1+2.16.times.Cr) (1+3.0.times.Mo)The steel has a non-carburized portion after carburizing and quenching, an internal structure of the non-carburized portion comprising a dual phase of martensite and ferrite, said ferrite having an area percentage of 10 to 70% in the dual phase.

Abstract: The present invention relates to a steel having excellent corrosion resistance and workability and more particularly to a steel having excellent corrosion resistance and workability in an exhaust system of internal combustion engines in, for example, internal combustion engines in automobiles and ships. A steel having excellent corrosion resistance and a steel having excellent corrosion resistance and workability, characterized by comprising Si: not less than 0.01 to less than 1.2%, Mn: 0.1 to 1.5%, Cr: 2.5 to 9.9%, and Al: more than 3.0 to 8.0%, and, reduced to, C: not more than 0.02%, P: not more than 0.03%, S: not more than 0.01%, and N: not more than 0.02%, and further comprising 0.01 to 0.5% in total of Nb, V, Ti, Zr, Ta, and Hf so as to meet a particular conditional formula, or further comprising at least one member selected from Cu, Mo, Sb, Ni, W, rare earth elements, and Ca, with the balance consisting of Fe and unavoidable impurities.

Abstract: A steel composition useful for the manufacture of articles and components having high abrasion resistance.

Abstract: This invention aims at providing a carburizing bearing steel which can provide excellent rolling fatigue characteristics by providing a long life carburizing bearing steel comprising, in terms of percent by weight, 0.1 to 0.35% of C, 0.3 to 2.0% of Mn, 0.001 to 0.03% of S, 0.4 to 1.5% of Cr, 0.01 to 0.07% of Al, 0.003 to 0.015% of N, 0.0005 to 0.03% of T.Mg, "0.35 to 1.70% of Si" or "0.05 to 1.70% of Si and 0.30 to 1.20% of Mo", a specific amount of at least one member consisting of Ni and V, and not more than 0.025% of P, and not more than 0.0050% of Ti and not more than 0.0020% of T.O, wherein a number ratio of Mg type oxides contained in the steel is at least 0.8.

Abstract: High-strength high-ductility steel whose chemical composition, by weight, comprises from 0.15% to 0.35% of carbon, from 0% to 3% of silicon, from 0% to 3% of aluminium, from 0.1% to 4.5% of manganese, from 0% to 9% of nickel, from 0% to 6% of chromium, from 0% to 3% of the sum of tungsten divided by two plus molybdenum, from 0% to 0.5% of vanadium, from 0% to 0.5% of niobium, from 0% to 0.5% of zirconium, at most 0.3% of nitrogen and, optionally, from 0.0005% to 0.005% of boron, optionally from 0.005% to 0.1% of titanium, optionally at least one element taken from Ca, Se, Te, Bi and Pb in contents less than 0.2%, the balance being iron and impurities resulting from smelting; the chemical composition furthermore satisfying the relationships: 1%.ltoreq.Si+Al.ltoreq.3% and 4.6.times.(%C)+1.05.times.(%Mn)+0.54.times.(%Ni)+0.66.times.(%Mo+%W/2)+0.5 .times.(%Cr)+K.gtoreq.3.8 where K=0.5 when the steel contains boron, K=0 when the steel does not contain boron.

Abstract: An alloy composition is disclosed for a transmission gear of an automobile containing increased amounts of a component such as nickel to improve the quenching properties, increased amounts of niobium, and reduced amounts of components having a strong oxygen affinity, the alloy thereby having improved purity and fatigue strength.

Abstract: A tool steel composition including, expressed by weight: 2.5% to 5.8% Cr, not more than 1.3% V, not more than 0.8% Si, with an Mo content lying in the range 0.75% to 1.75%, and not more than 0.35% Si, when the Mo content is 2.5% to 3.5%, with 0.3% to 0.4% by weight of C. Also disclosed is a method of preparing and of shaping such steels, as well as parts obtained thereby.

Abstract: A high pressure-low pressure single cylinder turbine rotor is disclosed which is characterized by being formed of a steel of a composition having, by weight, a C content of from 0.10 to 0.35%, a Si (silicon) content of not more than 0.3% (not including 0%), a Mn (manganese) content of not more than 1.0% (not including 0%), a Ni content of from 1.0 to 2.0%, a Cr (chromium) content of from 1.5 to 3.0%, a Mo content of from 0.9 to 1.3%, a V (vanadium) content of from 0.10 to 0.35%, a Nb (niobium) content of from 0.01 to 0.15%, a W content of from 0.1 to 1.5%, and the balance of Fe (iron) and inevitable impurities, the inevitable impurities having a P content of not more than 0.005%, a S content of not more than 0.001%, an As content of not more than 0.008%, a Sb content of not more than 0.004%, and a Sn content of not more than 0.008%.

Abstract: Alloy steel powders capable of obtaining high strength in a sintered state and having excellent compacting compressibility and methods of manufacturing a sintered body. The alloy steel powder comprises, by wt %, about 0.5-2% of Cr, not greater than about 0.08% of Mn, about 0.1-0.6% of Mo, about 0.05-0.5% of V, not greater than about 0.015 of S, not greater than about 0.2% of O, and the balance being Fe and incidental impurities. The alloy steel powder is compacted and sintered at a temperature of about 1100.degree.-1300.degree. C. and then cooled at a cooling rate no higher than about 1.degree. C./s in a temperature range of from about 800.degree. C. to 400.degree. C. The alloy steel powder can contain Nb and/or Ti and one or more of Co, W and B. Additionally, Ni powder and/or Cu powder may be adhered and dispersed onto the surface of the alloy steel powder.

Abstract: An alloy steel having particular utility for roll caster shells used in the direct casting of molten aluminum to sheet, consisting essentially of, in weight %, 0.25-0.45% C, 1.75-3.75% Cr, 0.75-2.5% Mo, 0.35 to 0.8% V, 0.4-1% Mn, greater than 0.4-1% Ni, 0.02% max P, 0.02% max S, up to 0.35% Si and balance essentially Fe. Roll caster shells fabricated from the steel have excellent toughness and ductility at room temperature to enable a greater shrink-fit with the core. The shells also have good resistance to heat checking. The excellent properties are provided by a controlled amount of Mo.sub.2 C and VC as well as limiting the amount of C in solution.

Abstract: The present invention relates to a steam turbine comprising a rotor shaft integrating high and low pressure portions provided with blades at the final stage thereof having a length not less than 30 inches, wherein a steam temperature at first stage blades is 530.degree. C., a ratio (L/D) of a length (L) defined between bearings of the rotor shaft to a diameter (D) measured between the terminal ends of final stage blades is 1.4 to 2.3. This rotor shaft is composed of heat resisting steel containing by weight 0.15 to 0.4% C, not more than 0.1% Si, 0.05 to 0.25% Mn, 1.5 to 2.5% Ni, 0.8 to 2.5% Cr, 0.8 to 2.5% Mo and 0.15 to 0.35% V and, further, the heat resisting steel may contain at least one of Nb, Ta, W, Ti, Al, Zr, B, Ca, and rare earth elements.

Abstract: A high toughness steel has a composition comprising, by weight, about 0.10% to 1.05% carbon, about 0.00% to 0.05% aluminum, about 0.01% to 0.20% titanium, about 0.0005% to 0.02% boron, about 0.01% to 0.20% niobium and about 0.015% to 0.04% nitrogen and the balance essentially iron. Also, the composition contains sufficient amount of manganese, silicon, nickel, chromium, vanadium, and molybdenum such that said high toughness steel article, after quenching and tempering, has a R.sub.c hardness measured in the middle of a section having a thickness of no more than 25.4 mm, of at least 50% of the hardness measured at the surface of said section. After quenching and tempering, steel articles made of this composition have a plane strain fracture toughness more than 25% higher than that for steel having the same base chemistry and heat treatment, and being free from titanium, niobium, and boron and elevated nitrogen. Also, the composition preferably contains about 0.001% to 0.004% oxygen and less than about 0.

Abstract: A steel for darburized gear having softening resistance, consisting essentially of, in weight percentages, 0.18 to 0.25% C, 0.45 to 1.00% Si, 0.40 to 0.70% Mn, 0.30 to 0.70% Ni, 1.00 to 1.50% Cr, 0.30 to 0.70% Mo, up to 0.50% Cu, 0.015 to 0.030% A1, 0.03 to 0.30% V, 0.010 to 0.030% Nb, up to 0.0015% O, 0.0100 to 0.0200% N and the balance consisting of Fe and inevitable impurity elements, wherein quenching at 820.degree. C. or higher after carburization does not cause any ferrite to be formed in a hardened structure of the core part of the carburized steel, and wherein, while tempering is generally performed at 160.degree. to 180.degree. C. after the quenching, reheating at any of temperatures inclusive of the tempering temperature and up to 300.degree. C. does not cause the hardness of a carburized case of the carburized steel to decrease by HV 50 or more from the one after the carburization, quenching and tempering.

Abstract: A dual purpose steel having high strength, high hardness, high wear resistance, high hardenability and easy machining and therefore being equally well suited for (a) elevated temperature closed die forging (b) room temperature machine part applications, such as gears, pinions, etc.

Abstract: A warm forging implement having high tensile strength, high abrasion resistance, high impact strength and high ductility and a composition within the following ranges:______________________________________ C .28-.36 Mn .40-1.00 P Usual S Usual Si up to .35 Ni 1.65-3.40 Cr .80-1.30 Mo .40-1.00 V .05-.15 ______________________________________and a method of manufacture thereof which includes either single or double vacuum treatment, the second vacuum treatment being vacuum arc remelting.

Abstract: A high-strength spring steel has a high fatigue limit and is characterized by restricting the number of oxide particle inclusion having a diameter of not less than 10 .mu.m in steel to not more than 12 particles/100 mm.sup.2.

Abstract: A low-Cr ferritic steel with improved toughness as well as creep strength is disclosed, which consists essentially of, by weight %:C: 0.03-0.12%, Si: 0.70% or less, Mn: 0.10-1.50%,Ni: 2.0% or less, Cr: 1.50-3.50%, W: 1.0-3.0%,V: 0.10-0.35%, Nb: 0.01-0.10%,B: 0.00010-0.020%, N: 0.005% or less,Al: 0.005% or less,Ti: not less than 0.001% but less than 0.05%,Cu: 0.10-2.50%,at least one of La, Ce, Y, Ca, Zr, Ta each in an amount of 0-0.20%, and Mg in an amount of 0-0.05%,Mo in an amount of 0-0.40%, anda balance of Fe and incidental impurities including P: not more than 0.030% and S: not more than 0.015%.

Abstract: A filler wire weld composition is set forth which provides high yield strength characteristics comparable to a base substrate made from a high performance Ni--Cr steel alloy. The filler wire weld composition is useful for repair welding substrate alloys used commercially in contexts such as turbine components such as rotors and discs.

Abstract: A ferritic alloy steel that may be used for making very large pipe molds with high ductility and high toughness for centrifugally casting pipe with an inside diameter that may exceed 40 inches, the steel consisting essentially of from about 0.12% to about 0.18% carbon, about 0.70% to about 0.95% manganese, about 0.008% maximum phosphorous, about 0.008% maximum sulphur, about 0.20% to about 0.35% silicon, about 1.05% to about 1.25% nickel, about 1.85% to about 2.25% chromium, about 0.60% to about 0.75% molybdenum, about 0.03% to about 0.08% vanadium, and balance essentially iron.

Abstract: A steel composition is provided having improved sag resistance and fatigue behavior properties adapting it to be suitable for coil and torsion bar suspension springs for passenger vehicles and light trucks of lesser weight. Critical to the composition is the use of vanadium in an amount of from about 0.05 to about 0.50 wt% or niobium in an amount of about 0.05 to about 0.20 wt%, sufficient nitrogen to ensure that the vanadium or niobium is in the form of vanadium nitride or niobium nitride respectively and the substantial absence of aluminum. The vanadium nitride or niobium nitride ensures fine grain formation and the improved properties. Other components may be present including carbon, silicon and chromium.

Abstract: New low-alloy steel compositions and rotor shafts for electric machines made from them are described. High nickel and chromium contents ensure high strength and toughness, while other components, notably silicon and other impurities, are kept low with the result that magnetic properties remain good. One aspect provides a steel with the following proportions by weight:C 0.15 to 0.3%Si <0.1%Mn <1%Ni 3 to 5%Cr >2%, <3.5%(Mo+W) 0.1 to 1.0%, W being optionalV 0.03 to 0.35%,and the remainder substantially Fe.Other aspects are also described.

Abstract: Disclosed is a high-strength spring steel containing C, Si, Mn, Ni, Cr, Mo, V and the like within the specified range, wherein the above components satisfy the following equation:550-333[C]-34[Mn]-20[Cr]-17[Ni]-11[Mo].gtoreq. 300where [C, Mn, Cr, Ni, or Mo] represents wt % of each component, and the average diameter of the non-metallic inclusions of oxides is specified. By use of the above steel, there can be obtained a high-strength spring steel having a tensile strength of 200 kgf/mm.sup.2 or more and being excellent in the fatigue characteristic and the sag resistance. Further, in the above steel, each content of C, Si, Ni, and Cr may be added to satisfies the following equation:50[Si]+25[Ni]+40[Cr]-100[C].gtoreq. 230where [Si, Ni, Cr or C] represents wt % of each component. Thus the corrosion fatigue characteristic is also improved.

Abstract: A low alloy steel product having high hardenability and good machaniability in the presence of a relatively low S content, and utilizing minimal quantities of the currently expensive elements Ni and Mo is disclosed, the product having the following approximate composition:______________________________________ C from about .42 to about .52 Si from about .15 to about .35 Ni from about .65 to about .95 Cr from about 1.40 to about 1.60 Mo from about .30 to about .50 Mn from about .75 to about .95 V from about .04 to about .10 S from about .010 to about .025 Ti from about .003 to about .075 Al from about .015 to about .030 Ca about 15% of Al H 2.

Abstract: Disclosed is a high strength spring steel consisting of, in weight percentage, 0.40 to 0.70% C, 0.50 to 2.00% Si, more than 0.50 to 1.50% Mn, 0.50 to 2.50% Ni, 0.20 to 1.50% Cr, more than 0.60 to 1.50% Mo, 0.01 to 0.50% V, 0.01 to 0.50% Nb, 0.005 to 0.100% Al and the balance being Fe and unavoidable impurities. The steel of the present invention has a high hardness coupled with high toughness and is very useful especially for springs used in suspension devices or other various industrial machines.

Abstract: A chromium heat-resistant steel excellent in toughness and having a high cracking resistance and a high creep strength when said steel is utilized to form a welded joint, said steel consisting essentially of:______________________________________ carbon: from 0.04 to 0.09 wt. %, silicon: from 0.01 to 0.50 wt. %, manganese: from 0.25 to 1.50 wt. %, chromium: from 7.0 to 9.2 wt. %, molybdenum: from 0.50 to 1.50 wt. %, soluble aluminum: from 0.005 to 0.060 wt. %, nitrogen: from 0.001 to 0.060 wt. %, ______________________________________where, the total amount of nitrogen and carbon being up to 0.13 wt. %, at least one element selected from the group consisting of: ______________________________________ vanadium: from 0.01 to 0.30 wt. %, and niobium: from 0.005 to 0.200 wt. %, ______________________________________where, the total amount of vanadium and 1.5 times niobium being up to 0.30 wt. %, and the balance being iron and incidental impurities; and the amount of ferrite as represented by the ferrite number (.

Abstract: A low alloy hot work implement which retains its fine grain size at elevated working temperatures up to the range of 2,200 degrees F. to 2,250 degrees F. characterized in having a substantial content of N in the range of 75-150 ppm and, preferably, Co in the range of 0.01 to 0.1 the implement being further characterized by relatively narrow ranges of C, Mn, Si, Ni, Cr, Mo, and V, and substantial contents of Al which furnishes the basis for a substantial presence of aluminum nitrides in the final product.

Abstract: A modified 1% CrMoV steel of particular use in steam and gas turbine rotors contains from about 0.20 percent to about 0.35 percent carbon, less than about 0.1 percent manganese, from about 1.5 percent to about 6.5 percent nickel, from about 0.8 percent to about 2.0 percent chromium, from about 0.9 percent to about 2.0 percent molybdenum, from about 0.1 percent to about 0.4 percent vanadium, from zero to about 0.07 percent columbium, less than about 0.12 percent silicon, less than about 0.006 percent phosphorus, less than about 0.002 percent sulfur, less than about 0.005 percent antimony, less than about 0.010 percent arsenic, less than about 0.010 percent tin, less than about 0.10 percent copper, less than about 0.010 percent aluminum, balance iron totalling 100 percent, with all percentages by weight.

Abstract: A high strength vacuum melted ferrous alloy having enhanced fracture toughness comprising not more than about 0.01% by weight sulfur, not more than about 0.1% manganese, and titanium in an amount in atomic percent of not less than about twice the atomic percentage of sulfur present in the alloy. Other detailed limits of titanium, zirconium, and niobium are also disclosed.

Abstract: High strength heat-resistant low alloy steels have a chemical composition of, on weight basis, a carbon content of 0.03-0.12%, a silicon content not higher than 1%, a manganese content of 0.2-1%, a phosphor content not higher than 0.03%, a sulfur content not higher than 0.03%, a nickel content not higher than 0.8%, a chromium content of 0.7-3%, a molybdenum content of 0.3-0.7%, a tungsten content of 0.6-2.4%, a vanadium content of 0.05-0.35%, a niobium content of 0.01-0.12% and a nitrogen content being 0.01-0.05% with the balance of iron and inevitable impurities, wherein the molybdenum content and the tungsten content satisfy the relationship 0.8%.ltoreq.(Mo+1/2W)%.ltoreq.1.5%; or a carbon content of 0.03-0.12%, a silicon content not higher than 1%, a manganese content of 0.2-1%, a phosphor content not higher than 0.03%, a sulfur content not higher than 0.03%, a nickel content not higher than 0.8%, a chromium content of 0.7-3%, a molybdenum content of 0.3-1.5%, a vanadium content of 0.05-0.

Abstract: A rolling-part steel and a rolling part employing same are disclosed. The steel includes: C; 0.1 to 0.7 wt. %, Si; below or equal to 0.04 wt. %; Mn; below or equal to 1.0 wt. %, Cr; 0.2 to 1.0 wt. %, S; below or equal to 0.003 wt. %; P; below or equal to 0.025 wt. %, O; below or equal to 0.0015 wt. %, the reminder Fe, and a necessary impurity. The steel has a good plastic-workability such that the rolling part can be produced only by plastic working. The steel also has a good hardenability.

Abstract: Described herein is high strength steels used for bolts containing as alloy elements:0.30%.ltoreq.C.ltoreq.0.50%,Si<0.10%,0.50%.ltoreq.Mn.ltoreq.0.70%,P.ltoreq.0.01%,S.ltoreq.0.01%,0.30%.ltoreq.Cr.ltoreq.1.05%,0.50%.ltoreq.Mo.ltoreq.1.05%,0.01%.ltoreq.al.ltoreq.0.05%,0.0020%.ltoreq.Ti.ltoreq.0.050%, and0.002%.ltoreq.N.ltoreq.0.010%,the elements Si, Mn, P, S, Mo, Al, Ti and N satisfying the relation as follows0.05%.ltoreq.Mo-45P-11S.ltoreq.0.85%7.5Si+1.7Mn.ltoreq.1.85%, and0.020%.ltoreq.10Ti+Al-6N.ltoreq.0.50%;and the balance of Fe and inevitable impurities.The high strength steels used for bolts may optionally contain at least one of Ni and V in the range of0.2%.ltoreq.Ni.ltoreq.1.5% and 0.05%.ltoreq.V.ltoreq.0.15%, respectively.

Abstract: A steel from which rolls for a cold rolling mill are made and which gives to the rolls very excellent wear resistance in addition to thermal shock and spalling resistances and various mechanical characteristics is provided. Said steel comprises:C : 0.70 to 1.50 wt %Si: 0.15 to 1.00 wt %Mn: 0.15 to 1.50 wt %Cr: 2.50 to 10.00 wt %Mo: 1.00 wt % or lessV : 1.00 wt % or lessNi: 1.00 wt % or lessTi: 0.04 to 0.30 wt %with the balance being Fe and inevitable impurities.

Abstract: A steel product, such as a medium carbon die block, having good impact, ductility, transverse and physical properties, and lower than normal sulphur contents yet having machinability equal or better than higher sulphur levels characterized by a lower than ordinary level of stringer-type inclusions, other inclusions being mainly of the non-deleterious globular type.

Abstract: A high fatigue strength metal band saw backing material of the present invention comprises 0.27 to 0.40% of C, not more than 0.35% of Si, 0.3 to 1.2% of Mn, 0.45 to 0.75% of Ni, more than 3.0% to 4.5% of Cr, 1.5 to 2.3% of one or two of Mo and W in terms of "Mo+W/2", 0.03 to 0.2% of one or two of V and Nb in terms of "V+Nb/2", in terms of percent by weight, the balance Fe and inevitable impurities. The metal band saw can maintain its high fatigue strength even if it is subjected to heat treatment under the same conditions as those for high speed steel used as an edge material and thus exhibits excellent properties as a metal band saw backing material.

Abstract: A steel suitable for a hot working press tool used for a slab width sizing press comprises particular amounts of C, Si, Cr, Mn, Mo, V and N having a specific Cr equivalent, or particular amounts of C, Si, Mn, Mo, V, Cr and Ni having a specified Cr/Ni ratio.

Abstract: A spring steel having a good durability and a good sag-resistance consisting essentially of by weight 0.35-0.55% carbon, 1.80-3.00% silicon, 0.50-1.50% manganese, 0.50-3.00% nickel, 0.10-1.50% chromium, 0.01-0.05% aluminum and 0.010-0.025% nitrogen, the remainder being iron and inevitable impurities.The spring steel has been completed for the purpose of obtaining a spring steel having a high toughness in a high hardness of not less than HRC 55 and having a good sag-resistance, in particular examining the contents of nickel, chromium and nitrogen in addition to the carbon content.

Abstract: A heat resistant steel of the present invention contains 0.05 to 0.2 wt. % of C, less than 0.5 wt. % of Si, less than 0.6 wt. % of Mn, 8 to 13 wt. % of Cr, 1.5 to 3 wt. % of Mo, 2 to 3 wt. % of Ni, 0.05 to 0.3 wt. % of V, 0.02 to 0.2 wt. % in total of either or both of Nb and Ta, 0.02 to 0.1 wt. % of N and the balance substantially Fe. Since a gas turbine of the present invention is constituted by members, such as discs, blades, shafts and so forth, made of alloys of this kind, the gas turbine has a structure in which it is possible to achieve a high level of creep rupture strength and Charpy impact value.

Abstract: A ferritic alloy steel with high ductility and high toughness, and a controlled microstructure for making pipe molds for centrifugally casting pipe consisting essentially of from about 0.12% to about 0.22% carbon, about 0.40% to about 0.80% manganese, about 0.025% maximum phosphorus, about 0.025% maximum sulphur, about 0.15% to about 0.40% silicon, about 0.00% to about 0.55% nickel, about 0.80% to about 1.20% chromium, about 0.15% to about 0.60% molybdenum, about 0.03% to about 0.08% vanadium, and balance essentially iron.

Abstract: A low-alloy steel suitable for use in generator rotors and having a combination of good strength and impact energy with a high magnetic permeability is disclosed. The low-alloy steels are comprised of in weight percent; about 3.5 to 5.25 percent nickel, about 0.75 to 2.0, percent chromium, about 0.3 to 0.8 percent molybdenum, about 0.05 to 0.15 percent vanadium, about 0.1 to 0.28 percent carbon, about 0.03 to 0.1 percent niobium or titanium, and the balance substantially iron, wherein nickel, chromium, and carbon additions are balanced.

Abstract: A steel for the production of as rolled products (products requiring no subsequent reheat treatment after finish rolling) for use in underground equipment and tools is provided which has a hardness in the order of 500 HV (Vickers); a Charpy toughness value at 20.degree.C. of 35 to 50 Joule; an excellent to fair corrosion resistance in simulated mild mine water as herein defined; and good to fair weldability; the steel having the following constitution on a percentage mass per mass basis:C=0.13 to 0.19; Cr=8.5 to 12.0;Ni=0 to 3.0; Si=0.10 to 0.5;Mn=0.3 to 0.9; Mo=0 to 1.4;Ti=0.01 to 0.04; Nb=0 to 0.06;Al=0.02 to 0.06; P=0.035(max); andS=0.02 (max); the balance being Fe.

Abstract: A ferritic alloy steel for roller caster shells with high heat resistance to heat checking or cracking used in continuously roll casting aluminum into sheets consisting essentially of from 0.45% to 0.49% carbon, 0.90% to 1.00% manganese, 0.010% maximum phosphorus, 0.002% maximum sulphur, 0.15% to 0.35% silicon, 1.20% to 1.50% nickel, 1.20% to 1.45% chromium, 0.80% to 1.00% molybdenum, 0.15% to 0.20% vanadium, 0.08% maximum rare earth, and balance essentially iron.

Abstract: Low alloy steels for use in pressure vessel comprising on the weight % basis:C: from 0.05% to 0.30%,Si: less than 0.10%,Mn: from 0.3% to 1.5%,Ni: from inevitably incorporated content to 0.55%,Cr: from 1.5% to 5.5%,Mo: from 0.25% to 1.5%,V: in excess of 0.10% and less than 0.6%, andthe balance of iron and inevitably incorporated impurities.The steels are excellent in hardenability, the hot strength, toughness weldability and hydrogen attack and embrittlement resistance, as well as show excellent toughness after the use in the temper brittle temperature region.

Abstract: A steel composition particularly suitable for the manufacture of electric resistance welded pipes for use in most hostile environments and able to display excellent sour resistance and high toughness. The aluminum content of the steel composition is reduced to not more than 0.005%, while from 0.006 to 0.2% in total of one or both of titanium and zirconium is used instead for steel containing 0.0005 to 0.008% Ca. The steel, apart from iron and unavoidable impurities further contains:0.01 to 0.35% C0.02 to 0.5% Si0.1 to 1.8% Mnnot more than 0.015% P, andnot more than 0.003% SCu, Ni, Cr, Mo, Nb and V may be added in appropriate amounts to enhance the steel performance.

Abstract: The present invention relates to low alloy steel and specifically to nickel-chrome-molybdenum steel.A low alloy steel having excellent stress corrosion cracking resistance containing C:.ltoreq.0.40%, Si:.ltoreq.0.15%, Mn:.ltoreq.0.20%, P:.ltoreq.0.010%, S:.ltoreq.0.030%, Ni: 0.50 to 4.00%, Cr: 0.50 to 2.50%, Mo: 0.25 to 4.00% and V:.ltoreq.0.30%, said Si, Mn and P being fulfilled with relationship of Si+Mn+20P.ltoreq.0.30%, the remainder comprising Fe and unavoidable impurities, the prior austenite crystal grain size being in excess of 4 of ASTM crystal grain size number.