Manufacturing method of 0.4-0.8 mm thick high-carbon alloy structural steel

A technology of alloy structural steel and manufacturing method, which is applied in the field of steel manufacturing, can solve the problems of incomplete penetration of deformation, poor formability of steel strip, low reduction rate, etc., and achieve the effect of good plastic toughness, excellent plastic toughness and bright surface

Active Publication Date: 2016-12-14
武汉钢铁有限公司
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Problems solved by technology

[0004] This application provides a method for manufacturing cold-rolled medium-high carbon alloy structural steel with a thickness of 0.4-0.8mm, which solves the problem of thicker cold-rolled products of medium-high carbon alloy steel in the prior art and low reduction rate of single cold rolling. Leading to the technical problem that the deformation cannot be completely penetrated, and the steel strip is not annealed after the second cold rolling, and the formability of the steel strip is poor

Method used

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  • Manufacturing method of 0.4-0.8 mm thick high-carbon alloy structural steel
  • Manufacturing method of 0.4-0.8 mm thick high-carbon alloy structural steel
  • Manufacturing method of 0.4-0.8 mm thick high-carbon alloy structural steel

Examples

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example 1

[0062] In this example, the manufacturing method of alloy structural steel 50Mn2 with a thickness of 0.4mm, the chemical composition is C: 0.50wt.%, Si: 0.27wt.%, Mn: 1.60wt.%, P: 0.012wt.%, S: 0.001wt .%, Alt: 0.021%, the rest is Fe and unavoidable impurities.

[0063] The raw steel coil with a thickness of 2.0mm is selected, the finish rolling temperature is 920°C, the cold rolling speed after finish rolling is 30°C / s, the coiling temperature is 730°C, and then the steel coil is slowly cooled in the warehouse.

[0064] The pickling temperature is 85° C., the concentration of the hydrochloric acid is 12%, the iron salt content in the hydrochloric acid is 105 g / l, and the pickling speed is 15 m / min.

[0065] The distribution of cold rolling passes is shown in Table 1. After the second cold rolling, the roll surface roughness Ra is 0.5 μm, and the intermediate annealing and finished annealing are annealed with full hydrogen protective gas.

[0066] Table 1 Distribution of cold...

example 2

[0073]The manufacturing method of the cold-rolled alloy structural steel 42CrMo4 with a thickness of 0.8mm in this example, the chemical composition is C: 0.39wt.%, Si: 0.22wt.%, Mn: 0.77wt.%, P: 0.012wt.%, S: 0.003wt.%, Alt: 0.030%, Cr: 1.1%, Mo: 0.17%, and the rest are Fe and unavoidable impurities.

[0074] The raw steel coil with a thickness of 2.5mm is selected, the finish rolling temperature is 860°C, the cold rolling speed after finish rolling is 18°C / s, the coiling temperature is 680°C, and then the steel coil is slowly cooled in the warehouse.

[0075] The pickling temperature is 75° C., the concentration of the hydrochloric acid is 6%, the iron salt content in the hydrochloric acid is 110 g / l, and the pickling speed is 30 m / min.

[0076] The distribution of cold rolling passes is shown in Table 3. After the second cold rolling, the roll surface roughness Ra is 0.45 μm. The protective gas used for intermediate annealing and finished annealing is a mixture of nitrogen ...

example 3

[0084] In this example, the manufacturing method of cold-rolled alloy structural steel 50CrVA with a thickness of 0.6mm, the chemical composition is C: 0.55wt.%, Si: 0.35wt.%, Mn: 0.60wt.%, P: 0.010wt.%, S: 0.006wt.%, Alt: 0.025%, Cr: 1.0%, V: 0.1%, and the rest are Fe and unavoidable impurities.

[0085] The raw steel coil with a thickness of 2.2mm is selected, the finish rolling temperature is 912°C, the cold rolling speed after finish rolling is 24°C / s, the coiling temperature is 700°C, and then the steel coil is slowly cooled in the warehouse.

[0086] The pickling temperature is 81° C., the concentration of the hydrochloric acid is 11%, the iron salt content in the hydrochloric acid is 95 g / l, and the pickling speed is 21 m / min.

[0087] The distribution of cold rolling passes is shown in Table 5. After the second cold rolling, the roll surface roughness Ra is 0.39 μm. The atmosphere used for intermediate annealing and finished annealing is a mixture of nitrogen and hydro...

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Abstract

The invention discloses a manufacturing method of a 0.4-0.8 mm thick high-carbon alloy structural steel. The structural steel comprises the following components in percentage by weight: 0.25-0.55% of C, 0.15-0.35% of Si, 0.10-2.0% of Mn, 0.10-2.0% of Cr, less than or equal to 0.030% of Alt, less than or equal to 0.020% of P, less than or equal to 0.010% of S, no more than 0.3% of other added alloy elements, and the balance of iron and inevitable impurity elements. The manufacturing method comprises finish rolling, acid pickling, first cold rolling, intermediate annealing, second cold rolling, and finished product annealing. The product of the target thickness specification, which is obtained through twice cold rolling and twice annealing for a hot-rolled product that is previously pickled with acid, has good formability and surface quality; precise parts complex in shape and high in precision can be manufactured; in addition, the technical problems of a failure in interpenetration caused by deformation due to a high thickness and a low single-pass cold-rolling reduction ratio of a cold-rooked product and poor formability of the steel strip due to no annealing after the completion of the second cold tooling in the prior art are solved.

Description

technical field [0001] The invention relates to the technical field of steel manufacturing, in particular to a method for manufacturing cold-rolled medium-high carbon alloy structural steel with a thickness of 0.4-0.8 mm. Background technique [0002] Medium-high carbon alloy structural steel is widely used in various industries such as hardware, home appliances, tools, stone processing, automobiles, textiles, etc. After cold rolling to 0.4-0.8mm, precision parts such as small springs, valve plates, and chains can be manufactured. Surface quality, composition uniformity, inclusions, etc. all have high requirements. [0003] The prior art discloses "a cold-rolled diaphragm spring steel for automobiles and its production method", specifically disclosing a cold-rolled diaphragm spring steel for automobiles and its production method, the composition and weight percentage of which are C: 0.40-0.65%, Si: 0.15-0.35%, Mn: 0.60-1.00%, P≤0.010%, S≤0.007%, Alt≤0.040%, Ni: 0.20-0.50%, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/18C22C38/02C22C38/04C22C38/06C21D8/02
CPCC21D8/0236C21D8/0268C22C38/02C22C38/04C22C38/06C22C38/18
Inventor 蔡珍毛新平徐进桥李国彬汪水泽何亚元甘晓龙孙宜强
Owner 武汉钢铁有限公司
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