Manufacturing method of cold-rolled medium-high carbon alloy structural steel with thickness ranging from 0.1 mm to 0.4 mm

An alloy structural steel and a manufacturing method technology, applied in the field of steel manufacturing, can solve the problems of easy fracture, peeling, incomplete penetration of deformation, poor forming performance of steel strips, etc., and achieve the effects of improving plasticity, reducing quantity and reducing strength.

Active Publication Date: 2016-12-14
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] This application provides a method for manufacturing cold-rolled medium-high carbon alloy structural steel with a thickness of 0.1-0.4mm, which solves the problem that the cold-rolled product of medium-high carbon alloy structural steel in the prior art is relatively thick and cold-rolled to a thickness below 0.4mm. It is prone to quality problems of fracture, peeling, and holes. The reduction rate of a single cold rolling is low, resulting in incomplete penetration of deformation, and no annealing after the end of cold rolling, and the technical problems of poor formability of the steel strip.

Method used

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  • Manufacturing method of cold-rolled medium-high carbon alloy structural steel with thickness ranging from 0.1 mm to 0.4 mm
  • Manufacturing method of cold-rolled medium-high carbon alloy structural steel with thickness ranging from 0.1 mm to 0.4 mm
  • Manufacturing method of cold-rolled medium-high carbon alloy structural steel with thickness ranging from 0.1 mm to 0.4 mm

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0078] The method for manufacturing cold-rolled structural alloy steel 50Cr with a thickness of 0.1 mm described in this example, the chemical composition is C: 0.50wt.%, Si: 0.27wt.%, Mn: 0.60wt.%, Cr: 1.0wt.%, P: 0.012wt.%, S: 0.001wt.%, Alt: 0.021%, and the rest are Fe and unavoidable impurities.

[0079] The thickness of the billet raw material is 55mm, 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, and the thickness of the steel coil is 2.0mm .

[0080] 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.

[0081] The distribution of cold rolling passes is shown in Table 1. The surface roughness Ra of the third cold rolling roll is 0.5 μm. The first intermediate annealing, the second intermediate annealin...

example 2

[0089] The manufacturing method of the cold-rolled structural alloy steel 42CrMo4 with a thickness of 0.4mm described 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 is Fe and unavoidable impurities.

[0090] The thickness of the billet raw material is 90mm, 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. The thickness of the steel coil is 2.5mm.

[0091] 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.

[0092] The allocation of cold rolling passes is shown in Table 3. After the third cold rolling, the surface roughness Ra of the roll is 0.45 μm. The protective gas used for the first intermediate...

example 3

[0101] The manufacturing method of cold-rolled alloy structural steel 40CrMn with a thickness of 0.2mm described in this example, the chemical composition is C: 0.40wt.%, Si: 0.35wt.%, Mn: 0.90wt.%, P: 0.010wt.%, S: 0.005wt.%, Alt: 0.025%, Cr: 1.0%, and the rest is Fe and unavoidable impurities.

[0102] The thickness of the billet raw material is 150mm, the finish rolling temperature is 912°C, the cold rolling speed after finish rolling is 24°C / s, and the coiling temperature is 700°C, and then the steel coil is slowly cooled in the warehouse, and the thickness of the steel coil is 2.2mm.

[0103] 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.

[0104] The distribution of cold rolling passes is shown in Table 5. After the third cold rolling, the surface roughness Ra of the roll is 0.35 μm. The protective gas used for the first intermediate anne...

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Abstract

The invention discloses a manufacturing method of cold-rolled medium-high carbon alloy structural steel with the thickness ranging from 0.1 mm to 0.4 mm. The cold-rolled medium-high carbon alloy structural steel is prepared from components in percentage by weight as follows: 0.25%-0.55% of C, 0.15%-0.35% of Si, 0.10%-2.0% of Mn, 0.10%-2.0% of Cr, 0.010%-0.030% of Alt, less than or equal to 0.015% of P, less than or equal to 0.005% of S, no more than 0.3% of other added alloy elements and the balance of Fe and inevitable impurity elements. The manufacturing method comprises steps as follows: smelting, refining, continuous casting, heating, finish rolling, pickling, cold rolling, intermediate annealing, cold rolling, intermediate annealing, cold rolling and finished product annealing. Through control on inclusions in the steel, three times of cold rolling and three times of annealing, a cold-rolled medium-high carbon alloy structural steel strip with the thickness ranging from 0.1 mm to 0.4 mm is obtained. The total reduction rate of first-time cold rolling and second-time cold rolling is controlled to be larger than or equal to 50%, and the single-pass reduction rate is larger than or equal to 10%, so that lamellar carbide in different areas are crushed, the carbide is evenly separated out in the shape of fine particles through long-time low-temperature intermediate annealing, the strength is further reduced, and the plasticity is further improved.

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 0.1-0.4 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 0.1-0.4mm, 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): C22C38/04C22C38/18C22C38/02C22C38/06C21D8/02
CPCC21D1/74C21D8/0226C21D8/0236C21D8/0268C21D8/0273C21D2211/009C22C38/02C22C38/04C22C38/06C22C38/18
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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