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.

Abstract: Disclosed herein is a high strength austenitic stainless steel with excellent corrosion resistance even in oxidative enviroments, and a method for producing such stainless steel, in which the kinds and proportions of the component elements are strictly restricted, especially limiting the contents of C and N to achieve solution strengthening while preventing degradations in corrosion resistance and defects of steel ingots which would be caused if they are added excessively. Besides, V is added under coexistence with Cr and Ni to increase the strength by precipitation of carbides and nitrides of V while preventing production of Cr carbides.

Abstract: A nitrogen-containing dual phase stainless steel with high hot workability, containing in percentage by weight:less than 0.03% of C;0.3-2.0% of Si;0.4-4.0% of Mn;16-22% of Cr;4-7% of Ni;2-4% of Mo;0.06-0.20% of N;less than 0.005% of S;0.001-0.01% of Ca in a Ca/S ratio of greater than 1.5;andthe balance of iron and inevitable impurities.

Abstract: Disclosed herein is a dual phase stainless steel suitable for use in sour wells. It comprises 0.06-0.20% C, .ltoreq.1.0% Si, 2.5-4% Mn, 20-27% Cr, 5-8% Ni, 2.5-4% Mo, 0.3-2% Cu, 0.1-0.25% N, 40-60% ferrite and the balance Fe and inevitable impurities. It may further contain one or more metals selected from Ti, Nb and V in a total amount of 0.1% to 0.5%. The dual phase stainless steel is excellent in proof strength, tensile strength and elongation and is capable of exhibiting good corrosion resistance in Cl.sup.- --CO.sub.2 --H.sub.2 S environments.

Abstract: High Mn-Cr non-magnetic steel having good resistance to stress corrosion cracking, which consists essentially of the following elements in percentage by weight:0.05-0.18% of carbon;up to 1.0% of silicon;16-25% of manganese;14-17% of chromium;0-0.8% of vanadium0.3-0.6% of nitrogen;0.06-0.3% of nickel; andthe balance of iron and inevitable impurities.

Abstract: A lubricant film which prevents galling or sliding metal surfaces comprising: a solid lubricant comprising 60-80% wt % of MoS.sub.2 or MoS.sub.2 +graphite; a lubricant additive comprising at least one component which comprises 10-30% wt % of Sb.sub.2 O.sub.3, Fe powder Zn powder or Ag powder; and an organic binder comprising 3-15% by weight of at least one component selected from the group consisting of epoxy ester resin, acrylic resin and urea resin.

Abstract: A catalytic converter effective to prevent damage or breakage of a catalytic element for improved durability. A catalytic element is housed in a casing and a pair of first and second end members are fitted into the opposite end portions of the casing so as to support the opposite end portions of the catalytic element via first and second end cushions. The first and second end cushions have, when in a free state, a rectangular cross section and inner diameters gradually increasing toward the catalytic element. The first and second cushions are compressed, when the catalytic converter is assembled, by the first and second end members to be fitted and held at their respective inner end portions between the inner circumferential surface of the casing and the outer circumferential surfaces of opposite end portions of the catalytic element.