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Method for producing 490MPa level acid-washing-free hot rolled steel plate

A technology for a hot-rolled steel sheet and a production method, applied in the field of metallurgy, can solve the problems affecting popularization and use, high smelting cost, and achieve the effects of low production cost, improved cold forming performance, and excellent cold bending performance.

Active Publication Date: 2011-01-05
PANGANG GROUP VANADIUM TITANIUM & RESOURCES +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Low C-Mn-V microalloying or trace Nb alloying steels are produced by controlled rolling and controlled cooling. Because of the disadvantage of high smelting cost after adding alloy elements, it affects the popularization and use of the above method

Method used

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  • Method for producing 490MPa level acid-washing-free hot rolled steel plate
  • Method for producing 490MPa level acid-washing-free hot rolled steel plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] a. Smelting molten steel: The smelting equipment is a 120-ton top-blown converter, blast furnace molten iron is used as raw material, the blast furnace molten iron temperature is 1370 ℃, and steelmaking auxiliary materials are added to smelt to 1697 ℃. Ferroalloy (Anyang Jiaxin Refractory Co., Ltd.) is pre-deoxidized, and then pitch coke (Panzhihua Yangcheng Metallurgical Accessories Co., Ltd.) and silicon-manganese alloy (Dechang Ferroalloy Co., Ltd.) are added to the deoxidized molten steel, so that the composition of The content is (based on the total weight of molten steel, wt%) C: 0.06, Si: 0.19, Mn: 1.06, P: 0.014, S: 0.012, Nb: 0.016, Ti: 0.01, Al: 0.05, N: 0.0042, The rest is Fe. Then, the molten steel tank is bottom-blown with argon on a small platform outside the furnace, and the argon pressure is 200-400 Pa for 4 minutes.

[0037] By controlling the addition amount of the deoxidizer, the oxygen content in the molten steel is 10-50 ppm, and the oxidation of m...

Embodiment 2

[0044] The preparation method is basically the same as that of Example 1, except that the molten steel obtained by converter smelting is C: 0.07, Si: 0.18, Mn: 1.10, P: 0.014, S: 0.006, Nb: 0.020, Ti: 0.01, Al: 0.04 , N: 0.0034, the rest is Fe, (weight percentage, %) and the hot-rolled steel sheet produced with the aforementioned molten steel, the slab discharge temperature is 1215 ° C, the finishing rolling temperature is 888 ° C, the coiling temperature is 575 ° C, and the hot-rolled finished product Thickness 7.0mm.

[0045] The mechanical properties of the prepared coils were tested, and the tensile strength Rm and elongation A at room temperature were detected respectively. 200mm , the tensile properties are carried out in accordance with the GB / T228 room temperature tensile test method for metal materials. The yield strength (Rel) of the finished product is 435MPa, the tensile strength (Rm) is 535MPa, and the elongation (A 200mm ) is 20%, the cold bending process test ...

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Abstract

The invention belongs to the technical field of metallurgy, and particularly relates to a method for producing a 490MPa level acid-washing-free hot rolled steel plate. The method comprises the following steps of: heating a continuous casting billet; hot rolling; cooling; reeling, and the like, wherein the billet comprises the following chemical compositions in percentage by weight: 0.04-0.11 percent of C, 0.13-0.27 percent of Si, 0.9-1.30 percent of Mn, 0.001-0.007 percent of N, 0-0.027 percent of P, 0-0.017 percent of S, 0.01-0.09 percent of Al, 0.013-0.027 percent of Nb, 0.004-0.012 percent of Ti and the balance of Fe; the heating temperature of the billet is 1,200-1,240 DEG C, the initial rolling temperature of the hot rolling is 1,120-1,220 DEG C, and the finish rolling temperature is 870-910 DEG C; front-section laminar flow water-cooling after rolling is used by the cooling step; and the temperature of the reeling step is 550-585 DEG C. In the invention, the yield strength of a finished steel band product obtained by the method is larger than or equal to 380MPa, the tensile strength is larger than or equal to 490 MPa, the elongation is larger than or equal to 17 percent, the cold bending property is good, and the proportion of Fe3O4 in an oxidized iron sheet on the surface of the finished product exceeds 80 percent.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and particularly relates to a production method of a 490MPa grade pickling-free hot-rolled steel plate. Background technique [0002] With the increasing development of the national economy, the automobile industry has become a pillar industry in my country, and the amount of hot-rolled steel sheets for automobiles is increasing year by year. In terms of steel, there is a requirement to develop steel products that can be pickled-free or easy to pickle. The form of iron oxide scale produced on the surface of this hot-rolled steel product is Fe 3 O 4 +Fe, not Fe 3 O 4 +FeO type, even multi-layer Fe needs to be generated 3 O 4 oxide. Due to Fe 3 O 4 It has reduced hardness (HV350~HV500), good plasticity and good adhesion, so it will not peel and crack due to bending in the subsequent deep processing process, and the iron oxide scale can play the role of lubrication between the tool and th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/14C21D8/02
Inventor 刘庆春郑之旺刘勇李正荣冯远超黄徐晶
Owner PANGANG GROUP VANADIUM TITANIUM & RESOURCES
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