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Manufacturing method of cold-rolled medium-high carbon structural steel

A manufacturing method and technology of structural steel, applied in the field of steel manufacturing, can solve the problems of incomplete penetration of deformation, uneven structure, low reduction rate, etc., and achieve the effects of reduced annealing passes, uniform structure and performance, and good plasticity and toughness

Active Publication Date: 2016-11-16
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] This application provides a method for manufacturing cold-rolled medium-high carbon structural steel, which solves the problem that in the prior art, two annealings are required, and the reduction rate of a single cold-rolling is low, resulting in incomplete penetration of deformation, and easy to cause uneven structure, The technical problem of poor plasticity and toughness achieves the technical effect of improving production efficiency and reducing costs

Method used

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  • Manufacturing method of cold-rolled medium-high carbon structural steel
  • Manufacturing method of cold-rolled medium-high carbon structural steel
  • Manufacturing method of cold-rolled medium-high carbon structural steel

Examples

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Effect test

example 1

[0063] The manufacturing method of cold-rolled carbon structural steel 65Mn with a thickness of 0.8mm in this example, the components and weight percentages of cold-rolled carbon structural steel 65Mn are C: 0.70%, Si: 0.27%, Mn: 1.20%, P: 0.012%, S: 0.001%, Alt: 0.021%, and the rest are Fe and unavoidable impurities.

[0064] According to the cold-rolled carbon structural steel 65Mn with a thickness of 0.8mm, a 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, and the coiling temperature is 730°C ℃, and then the steel is coiled into the warehouse for slow cooling.

[0065] 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.

[0066] The distribution of cold rolling passes is shown in Table 1, and the surface roughness Ra of the last pass is 0.5 μm. ...

example 2

[0074] The manufacturing method of the cold-rolled alloy structural steel 42CrMo4 with a thickness of 1.5mm in this example, the components and weight percentages of the cold-rolled alloy structural steel 42CrMo4 are 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.

[0075]According to the cold-rolled alloy structural steel 42CrMo4 with a thickness of 1.5mm, a raw steel coil with a thickness of 3.0mm is selected, the finish rolling temperature is 860°C, the cold rolling speed after finish rolling is 18°C / s, and the coiling temperature is 680°C , and then the steel is rolled into the warehouse for slow cooling.

[0076] 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.

[0077] The distribution of cold rolling passes is shown in Table 3, and the s...

example 3

[0085] In this example, the manufacturing method of cold-rolled carbon structural steel SAE1055 with a thickness of 1.0mm, the chemical composition of cold-rolled carbon structural steel SAE1055 is C: 0.55wt.%, Si: 0.35wt.%, Mn: 0.90wt.%, P : 0.010wt.%, S: 0.006wt.%, Alt: 0.025%, Cr: 0.10%, and the rest are Fe and unavoidable impurities.

[0086] According to the cold-rolled carbon structural steel SAE1055 with a thickness of 1.0mm, the raw steel coil with a thickness of 2.5mm is selected, the finishing rolling temperature is 912°C, the cold rolling speed after finishing rolling is 24°C / s, and the coiling temperature is 700°C , and then the steel is rolled into the warehouse for slow cooling.

[0087] 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.

[0088] The distribution of cold rolling passes is shown in Table 5, and the surface roughness Ra...

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Abstract

The invention discloses a manufacturing method of cold-rolled medium-high carbon structural steel. The steel is prepared from components in percentage by weight as follows: 0.30%-0.70% of C, 0.15%-0.35% of Si, 0.10%-1.20% of Mn, 0.10%-1.10% 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 Fe and inevitable impurity elements. According to the manufacturing method, one-time annealing and one-time cold-rolling are adopted, a raw material steel coil can be cold-rolled directly by controlling hot rolling process parameters, the cold-rolling reduction ratio is larger than or equal to 50%, deformation can infiltrate the structural core part, lamellar carbide in a hot-rolled raw material pearlite structure is broken through cold-rolling deformation, a lot of dislocation is produced in grains, the broken carbide and defects provide a core for separation of carbide in the annealing process, the uniform structure and the tiny carbide are obtained, and technical effects of improving the production efficiency and reducing the cost are realized.

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 structural steel. Background technique [0002] Medium-high carbon structural steel is widely used in key industries such as machinery, automobiles, and high-tech. etc. 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 components and weight percentages 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%, Cr: 0.80-1.20%, V: 0.27-0.55%, N≤0.005%, the coiling temperature of this method is 650-750 ° C, annealing is performed after coiling, the first annealing temperature is 700-840 ° C, followed by cold rolling, the first cold rolling The reduction rate is 15-25%, ...

Claims

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Application Information

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IPC IPC(8): C21D8/04C22C38/02C22C38/04C22C38/18
CPCC21D8/0436C22C38/02C22C38/04C22C38/18
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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