Abstract: A hot dipped high manganese steel and a manufacturing method therefor. The high manganese steel comprises a steel base plate and a coating on the surface of the steel base plate. The core of the steel base plate is austenite. The surface layer of the steel base plate is a ferrite fine grain layer. The ferrite fine grain layer comprises an oxide of Al. Furthermore, the steel base plate of the hot dipped high manganese steel comprises, in mass percentages, 10 to 30% of Mn element, 1 to 2% of Al element, and 0.4 to 0.8% of C element. The manufacturing method comprises: 1) manufacturing strip steel; 2) primary annealing and acid washing; 3) secondary annealing and hot dipping.

Abstract: A continuous annealing method for low coercive force cold-rolled electromagnetic pure iron plate and strip. Control parameters of each stages in a continuous annealing process are as follows: 750-850° C. at a heating stage; 750-850° C. at a soaking stage, the soaking time is 100-150 s; an outlet temperature of 575-675° C. at a slow-cooling stage, the cooling speed in slow-cooling stage is 2.5-10° C./s; an outlet temperature of 380-420° C. at a fast-cooling stage, the cooling speed of the fast-cooling stage is 15-25° C./s; and 270-310° C. at an overaging stage. The annealing medium is a non-oxidizing atmosphere composed of H2 and N2. After annealing, the cold-rolled electromagnetic pure iron plate and strip is leveled and pressed such that the leveling elongation rate of the plate and strip is controlled within the range of 0.2±0.1%.

Abstract: Method for directly producing a pickling-free hot-plated sheet strip product from molten steel comprising: obtaining a refined molten steel; thin strip continuous casting: a mixed gas of an inert gas and a reducing gas is used for protection in the billet casting process; hot rolling: the cast strip is levelled at a high temperature so as to improve the sheet shape and rolled to a suitable thickness so as to change the product specification, or provide a mechanical disruption action on the iron oxide skin on the surface of the cast strip; reduction annealing: a sectional reduction method is used to perform sectional reductions with the temperature held within two ranges, i.e., 450-600° C. and 700-1000° C., wherein the reduction is performed within a range of 450-600° C. for 1-5 minutes and within a range of 700-1000° C.

Abstract: A non-oriented electrical steel having excellent magnetic properties, the chemical elements thereof in percentage by mass being: Si: 0.2-1.5%, Mn: 0.01-0.30%, Al: 0.001-0.009%, O: 0.005-0.02%, C?0.005%, S?0.005%, N?0.005%, and Ti?0.002%, the remainder being Fe and other unavoidable impurities, and Al/Si?0.006 and Mn/Si?0.2. The method for producing comprises the following sequence of steps: (1) smelting; (2) hot rolling: the slab heating temperature being 850° C. to 1250° C., and the final rolling temperature being 800-1050° C.; (3) acid pickling; (4) cold rolling; (5) annealing: the annealing plate temperature being controlled between 620° C.-900° C.; and (6) coating.

Abstract: Disclosed is an aluminium-zinc hot-plated steel plate having excellent weather resistance, corrosion resistance and alkali resistance, and an environmental-friendly surface treating agent therefor, wherein after the surface treatment of the aluminium-zinc hot-plated steel plate using an environmental-friendly surface treating agent consisting of the components of a matrix resin compounded from a particular solvent-free aqueous aliphatic polyurethane dispersion and aqueous polyurethane-acrylic acid copolymer, an organic silicon compound, a matrix resin curing agent, a water-soluble metal salt compound and a high-density polyethylene lubrication auxiliary etc., the formed surface-treated aluminium-zinc hot-plated steel plate has comprehensive properties of excellent weather resistance, corrosion resistance and alkali resistance, and good machine formability etc.

Abstract: A hot dipped medium manganese steel and a manufacturing method therefor. The medium manganese steel comprises a steel base plate and a coating on the surface of the steel base plate; the mass percentages of the components in the hot dipped medium manganese steel are: C: 0.1 to 0.3%, Si: 0.1 to 2.0%, Mn: 5 to 12%, Al: 1 to 2%, P?0.02%, S?0.02%, N?0.005%, and the remaining being Fe and unavoidable impurities; the core structure is ferrite and austenite, and the surface layer of the steel base plate is a ferrite layer.

Abstract: Disclosed is a rolling method for a board having various longitudinal thicknesses, comprising the following steps: 1) setting a number N of uniform-thickness segments of a sample, thicknesses h1, h2, . . . , hN of the uniform-thickness segments, lengths L1, L2, . . . , LN of the uniform-thickness segments, and lengths T1, T2, . . .

Abstract: A free-cutting and non-quenched and tempered steel, comprising the following chemical elements by mass percentages: C: 0.35-0.45%, Si: 0.45-0.0.65%, Mn: 1.35-1.65%, S: 0.025-0.065%, V: 0.07-0.15%, Ti: 0.01-0.018%, N: 0.012-0.017%, Al: 0.015-0.035%, Ca: 0.0008-0.0025%, with the remaining being iron and other unavoidable impurities, wherein the S and Ca elements satisfy the relationship S/Ca=20-60. A manufacturing method of the free-cutting and non-quenched and tempered steel, comprising the following steps: (1) smelting and refining; (2) casting; (3) rolling; (4) forging; and (5) two-stage cooling.

Abstract: A method of strengthening a dilute magnesium alloy sheet includes providing a dilute magnesium alloy sheet, which includes a magnesium alloy consisting essentially of (wt %): >0 to 3.0 of Zn; >0 to 1.5 of Ca; 0 to 1.0 of Zr; 0 to 1.3 of a rare earth element or mixture of the same; 0 to 0.3 of Sr; 0 to 0.7 of Al, the balance of Mg and other unavoidable impurities, wherein the total weight % of alloying elements is less than 3%; subjecting the dilute magnesium alloy sheet to plastic deformation, in which the tensile plastic strain should exceed 0.5%, but be less than 8% to form a pre-deformed magnesium alloy sheets; and subjecting the pre-deformed magnesium alloy sheets to an ageing treatment in a temperature range of 80 to 250° C. for at least 1 minute, thereby forming a strengthened magnesium alloy sheet.

Abstract: A laser-scribed grain-oriented silicon steel resistant to stress-relief annealing and a manufacturing method therefor. Parallel linear grooves (20) are formed on one or both sides of grain-oriented silicon steel (10) by laser etching. The linear grooves (20) are perpendicular to, or at an angle to, the rolling direction of the steel plate. A maximum height of edge protrusions of the linear grooves (20) does not exceed 5 ?m, and a maximum height of spatters in etch-free regions between adjacent linear grooves (20) does not exceed 5 ?m, and the proportion of an area occupied by spatters in the vicinity of the linear grooves (20) does not exceed 5%. The steel has low manufacturing costs, and the etching effect of the finished steel is retained during a stress-relief annealing process. The steel is suitable for manufacturing of wound iron core transformers.

Abstract: The invention discloses an oriented silicon steel with excellent magnetic properties and a manufacturing method thereof. The present invention obtains the oriented silicon steel with excellent magnetic properties by controlling the area ratio of small crystal grains of D<5 mm in an oriented silicon steel finished product to be not more than 3%, and controlling the ratio ?17/?15 of the magnetic conductivity under the magnetic induction of 1.7 T and 1.5 T in the oriented silicon steel finished product to be 0.50 or more.

Abstract: A steel welding component with an aluminum or aluminum alloy coating, using a steel welding blank with an aluminum or aluminum alloy coating. The welding blank is composed of a steel substrate (1) and coatings (2, 2?); the coating (2) comprises an intermetallic compound alloy layer (21) which contacts the substrate (1), and a metal alloy layer (22) on the intermetallic compound alloy layer (21); on at least one of the coating surfaces of the welding blank, the coating (2) within an area (3) to be welded of the welding blank has been totally removed, and an end face (23) of the coating (2) on the side of the coating within the area (3) to be welded removed has an angle of ? with a plane vertical to a surface (11) of the substrate (1) which is parallel to the welding seam, wherein ? is 0-80°. Also provided are welding and preparation methods for the steel welding component.

Abstract: A high-toughness low-alloy wear-resistant steel sheet and a method of manufacturing the same, which has the chemical compositions (wt %): C: 0.08-0.20%; Si: 0.10-0.60%; Mn: 1.00-2.00%; B: 0.0005-0.0040%; Cr: less than or equal to 1.50%; Mo: less than or equal to 0.80%; Ni: less than or equal to 1.50%; Nb: less than or equal to 0.080%; V: less than or equal to 0.080%; Ti: less than or equal to 0.060%; Al: 0.010-0.080%, Ca: 0.0010-0.0080%, N: less than or equal to 0.0080%, O: less than or equal to 0.0080%, H: less than or equal to 0.0004%, P: less than or equal to 0.015%, S: less than or equal to 0.010%, and (Cr/5+Mn/6+50B): more than or equal to 0.20% and less than or equal to 0.55%; (Mo/3+Ni/5+2Nb): more than or equal to 0.02% and less than or equal to 0.45%; (Al+Ti): more than or equal to 0.01% and less than or equal to 0.13%, the remainders being Fe and unavoidable impurities.

Abstract: A method for arranging jet cleaning nozzles comprising: arranging multiple rows of nozzles in a parallel and uniform manner along a lengthwise direction of a metal plate strip; arranging the nozzles in each row at an equal interval; arraying adjacent rows of nozzles in a staggered manner along the widthwise direction of the metal plate strip so as to form a nozzle matrix; wherein each nozzle is perpendicular to a moving direction of the metal plate strip, and the perpendicular distance of each nozzle to a surface of the metal plate strip is the same. Through the method for arranging jet cleaning nozzles, nozzles can be flexibly controlled based on the change of the geometric relationship between nozzles, in order to implement efficient and continuous descaling on the surfaces of a metal plate strip with different width specifications and different requirements on the descaling speed.

Abstract: A roll for rolling surface topography of a steel plate is disclosed. A plurality of raised textured points are arranged on a roll surface. The shape formed by a joint between each single textured point and the roll surface is circular or approximately circular. The circular shape has a diameter of 50˜150 ?m. Each single textured point has a raised height of 2˜12 ?m, and the overlap among adjacent textured points is lower than 10%. The quantity variance of the textured points per square millimeter of the roll surface is lower than 20%, and the coverage area ratio of the textured points in each square millimeter is 30˜90%. The method comprises performing surface treatment on a feed roll to control the surface roughness Ra of the roll to be smaller than 0.5 ?m; and performing layer-by-layer ablation on a surface material of the roll to form the textured points.

Abstract: A high-strength and high-toughness tube for perforating gun, having a formulation of chemical elements in percentage by mass as follows: C: 0.15%-0.22%, Si: 0.1%-0.4%, Mn: 0.5%-1%, Cr: 0.3%-0.7%, Mo: 0.3%-0.7%, Nb: 0.01%-0.04%, V: 0.1%-0.2%, Ti: 0.02%-0.05%, B: 0.0015%-0.005%, Al: 0.01%-0.05%, Ca: 0.001%-0.004%, N?0.008%, and the balance of Fe and other inevitable impurities. Accordingly, further disclosed is a method for manufacturing a high-strength and high-toughness tube for perforating gun. The high-strength and high-toughness tube for perforating gun of the present invention has high strength, good toughness and uniform circumferential strength, and is suitable for application in the field of petroleum exploration and exploitation.

Abstract: A control method and apparatus for inhibiting slag entrapment in ladle (1) during continuous casting production. An optimal control model calculating unit (11) receives related signals and data sent by a ladle weight detector (4), a molten steel flow field detector (5), a slag detector (7), a sliding gate opening detector (9), and a process signal interface unit (10), performs calculation and analysis according to an optimal control model to obtain a corresponding optimal control strategy, and outputs the strategy to an electromagnetic brake (6) and a sliding gate controller (8) for slag entrapment inhibition control. Regarding the two processes where a vortex may be formed, by means of different optimal control strategies, which respectively inhibit or destroy the formation of a vortex, slag generation is postponed, and molten steel may flow out without bringing slag out, thereby reducing residual ladle steel and improving molten steel yield.

Abstract: Disclosed are a system and method for controlling a thickness of a hot-dip galvanized coating on a strip material with a continuously varying thickness. The system of the present disclosure is capable to provide a zinc coating with a uniform thickness on a coiled starting material with a continuously varying thickness, and the method of the present disclosure provides a simplified process to achieve such objective.

Abstract: Provided are a 1500 MPa-grade steel with a high product of strength and elongation for vehicles and a manufacturing method thereof. The mass percentages of the chemical elements thereof are: 0.1-0.3% of C, 0.1-2.0% of Si, 7.5-12% of Mn, 0.01-2.0% of Al, and the balance of iron and other inevitable impurities. The microstructure of the steel with a high product of strength and elongation for vehicles is austenite+martensite+ferrite or austenite+martensite. The steel for vehicles can reach a grade of 1500 MPa, and has a product of strength and elongation of no less than 30 GPa %.

Abstract: Provided is a cold-rolled high-strength steel having a tensile strength of not less than 1500 MPa and an excellent formability, the chemical elements thereof having the following mass percent ratios: 0.25%-0.40% of C, 1.50%-2.50% of Si, 2.0%-3.0% of Mn, 0.03%-0.06% of Al, P?0.02%, S?0.01%, N?0.01% and at least one of 0.1%-1.0% of Cr and 0.1%-0.5% of Mo, with the balance being Fe and other unavoidable impurities. The microstructure of the cold-rolled high-strength steel has 5%-20% of residual austenite and 70%-90% of martensite, and the carbon concentration ratio of the residual austenite to the martensite is greater than 3.5 and less than 15. The cold-rolled high-strength steel sheet has a high strength and an excellent formability through a rational ingredient design and microstructure control.