A high-efficiency energy-saving cold heading steel hot-rolled wire rod and its production method

A high-efficiency, energy-saving, hot-rolled wire rod technology, applied in the field of iron and steel manufacturing, can solve the problems of low hardenability and limited use of cold-headed steel hot-rolled wire rods, and achieve the goal of improving hot-working performance, quality, and hardness Effect

Active Publication Date: 2017-08-29
福建三钢闽光股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a high-efficiency energy-saving cold heading steel hot-rolled wire rod and its production method to solve the defects of the existing cold heading steel hot-rolled wire rod such as low hardenability and limited use

Method used

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  • A high-efficiency energy-saving cold heading steel hot-rolled wire rod and its production method
  • A high-efficiency energy-saving cold heading steel hot-rolled wire rod and its production method
  • A high-efficiency energy-saving cold heading steel hot-rolled wire rod and its production method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The above-mentioned production method of high-efficiency and energy-saving cold heading steel hot-rolled wire rod, wherein the composition of cold heading steel includes by weight percentage: C content is 0.06%, Si content is 0.05%, Mn content is 0.42%, The P content is 0.01%, the S content is 0.01%, the Als content is 0.02%, the Ti content is 0.025%, the B content is 0.0045%, and the balance is Fe and unavoidable impurities. The heating process is to send the steel billet into the heating furnace and heat it to 1050°C; in the rolling process, the temperature for finishing rolling is 890-950°C; -900°C; the Stelmore roller table cooling process is to control the speed of the roller table to be 0.2-0.5m / s, and the cooling rate to be 0.5-5°C / s.

[0029] The following table is the performance comparison of products made of high-efficiency energy-saving cold heading steel and SWRCH22A in this embodiment

[0030]

Embodiment 2

[0032] The above-mentioned production method of a high-efficiency energy-saving cold heading steel hot-rolled wire rod, wherein the composition of the cold heading steel includes by weight percentage: C content is 0.13%, Si content is 0.05%, Mn content is 0.50%, P content is 0.01%, S content is 0.02%, Als content is 0.02%, Ti content is 0.02%, B content is 0.004%, V content is 0.015%, Co content is 0.005%, the balance is Fe and unavoidable Impurities.

[0033] The following table is the performance comparison of products made of high-efficiency energy-saving cold heading steel and SWRCH22A in this embodiment

[0034]

Embodiment 3

[0036]The above-mentioned production method of a high-efficiency energy-saving cold heading steel hot-rolled wire rod, wherein the composition of the cold heading steel includes by weight percentage: a C content of 0.08%, a Si content of not more than 0.03%, and a Mn content of 0.65% %, P content is 0.005%, S content is 0.008%, Als content is 0.03%, Ti content is 0.02%, B content is 0.004%, V content is 0.008%, Co content is 0.005%, and the balance is Fe and not Avoid impurities.

[0037] The following table is the performance comparison of products made of high-efficiency energy-saving cold heading steel and SWRCH22A in this embodiment

[0038]

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Abstract

Disclosed is an efficient and energy-saving cold heading steel hot-rolled wire rod. Cold heading steel comprises, by weight percentage, 0.05%-0.13% of C, smaller than or equal to 0.08% of Si, 0.5%-0.7% of Mn, smaller than or equal to 0.02% of P, smaller than or equal to 0.02% of S, larger than or equal to 0.01% of Als, 0.02%-0.03% of Ti, 0.004%-0.005% of B, and the balance Fe and inevitable impurities. According to the invention, the carbon content of the steel is substantially reduced, the strength of the steel formed after drawing is substantially reduced, and the plasticity of the steel is improved; the content of the Mn is increased, and therefore the quality of the steel is improved, the fragility of the steel is reduced, the hot-working performance of the steel is improved, and manganese can mostly dissolve in ferrite to form a substitutional solid solution; and the appropriate amount of boron is further added to the steel, acidic boron is formed in the steel, and therefore the hardenability of the steel is further improved.

Description

technical field [0001] The invention relates to the field of iron and steel manufacturing, in particular to a high-efficiency energy-saving cold heading steel hot-rolled wire rod and a production method thereof. Background technique [0002] Cold heading steel wire rods are mainly used to manufacture bolts, nuts, screws and other fasteners and some cold-formed parts. They have a wide range of uses and are in great demand. The technical requirements for home appliance screws and screw products are as follows: (1) Core hardness (HV0.3): 270-390; (2) Surface hardness (HV0.3): ≥450; (3) Torsional strength (N m) : ST2.9: 1.5, ST3.3: 2.0, ST3.5: 2.8, ST3.9: 3.4, ST4.2: 4.4, ST4.8: 6.3, ST4.9: 6.5, ST5.5: 10. According to the above technical requirements, the steel used should be cold heading steel with a carbon content of about 0.22%. When using medium carbon steel wire rods to prepare high-strength bolts, annealing or drawing annealing is required to soften the material and redu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/14C22C38/04C22C38/06C21D8/06C22C38/12C22C38/10
CPCC21D8/065C22C38/002C22C38/04C22C38/06C22C38/10C22C38/12C22C38/14
Inventor 陈伯瑜魏勇王明娣蔡常青严海峰陈正权陈泽平
Owner 福建三钢闽光股份有限公司
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