High-weather-resistant cold heading steel for 10.9 grade fastener and production method of high-weather-resistant cold heading steel

A production method and fastener technology, applied in the field of cold heading steel production, can solve the problems that the weather resistance index I value does not reach 7.0, cannot be used to make high-strength fasteners, etc., and achieve the goal of increasing corrosion resistance Effect

Active Publication Date: 2020-03-27
MAANSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Fasteners made of steel produced by the method of the invention have good oxidation resistance and corrosion resistance, yield strength reaches 320-370MPa, tensile strength is 490-520MPa, and has good cold drawing, cold heading and hot upset processing. Process performance, good anti-oxidation and anti-corrosion performance at the same time, can meet the working requirements of high stress and high relaxation conditions in corrosive environments; but its tensile strength is below 520MPa, it cannot be used to make high-strength fasteners
[0005] The Chinese patent application number is: 201711215120.3, and the publication date is: 2018.05.25 "A 1040MPa weather-resistant bolt with delayed fracture resistance". The mass percentage of its chemical composition is: C: 0.21~0.32, Si: 0.10~0.50,

Method used

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  • High-weather-resistant cold heading steel for 10.9 grade fastener and production method of high-weather-resistant cold heading steel
  • High-weather-resistant cold heading steel for 10.9 grade fastener and production method of high-weather-resistant cold heading steel
  • High-weather-resistant cold heading steel for 10.9 grade fastener and production method of high-weather-resistant cold heading steel

Examples

Experimental program
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Effect test

Embodiment 1

[0085] The main chemical composition and mass percentage of the high weather-resistant cold heading steel for 10.9-grade fasteners in this embodiment are shown in Example 1 in Table 1.

[0086] A production method of high-weather-resistant cold-heading steel for 10.9 grade fasteners of this embodiment includes the following steps on the basis of the ingredients of this embodiment:

[0087] S1. Electric furnace smelting; during the smelting process, the oxygen is fixed before tapping, and the steel is left during the tapping process to avoid slag.

[0088] S2, LF furnace refining: during the LF furnace refining process, adjust elements such as C, Si, Mn, Cr, Ni, Cu, V, Re, P to the target value.

[0089] S3, RH vacuum degassing; degassing time ≥ 15 minutes, [H] content ≤ 1.5ppm after vacuum treatment, to avoid hydrogen embrittlement of bolts.

[0090] S4. Billet continuous casting; the temperature of the molten steel in the tundish is controlled at 10-40°C above the liquidus l...

Embodiment 2

[0099] The main chemical composition and mass percentage of a high weather-resistant cold heading steel for 10.9-grade fasteners in this embodiment are shown in Example 2 in Table 1.

[0100] A production method of high-weather-resistant cold-heading steel for 10.9 grade fasteners of this embodiment includes the following steps on the basis of the ingredients of this embodiment:

[0101] S1. Electric furnace smelting; during the smelting process, the oxygen is fixed before tapping, and the steel is left during the tapping process to avoid slag.

[0102] S2, LF furnace refining: during the LF furnace refining process, adjust elements such as C, Si, Mn, Cr, Ni, Cu, V, Re, P to the target value.

[0103] S3, VD vacuum degassing; degassing time ≥ 15 minutes, [H] content ≤ 1.5ppm after vacuum treatment, to avoid hydrogen embrittlement of bolts.

[0104] S4. Billet continuous casting; the temperature of the molten steel in the tundish is controlled at 10-40°C above the liquidus lin...

Embodiment 3

[0113] The main chemical composition and mass percentage of the high weather-resistant cold heading steel for 10.9-grade fasteners in this embodiment are shown in Example 3 in Table 1.

[0114] A production method of high-weather-resistant cold-heading steel for 10.9 grade fasteners of this embodiment includes the following steps on the basis of the ingredients of this embodiment:

[0115] S1. Converter smelting; during the smelting process, the oxygen is fixed before tapping, and the steel is left during the tapping process to avoid slag.

[0116] S2, LF furnace refining: during the LF furnace refining process, adjust elements such as C, Si, Mn, Cr, Ni, Cu, V, Re, P to the target value.

[0117] S3, RH vacuum degassing; degassing time ≥ 15 minutes, [H] content ≤ 1.5ppm after vacuum treatment, to avoid hydrogen embrittlement of bolts.

[0118] S4. Billet continuous casting; the temperature of the molten steel in the tundish is controlled at 10-40°C above the liquidus line, an...

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Abstract

The invention discloses a high-weather-resistant cold heading steel for a 10.9 grade fastener and a production method of the high-weather-resistant cold heading steel, and belongs to the technical field of cold heading steel production. The main chemical composition of the high-weather-resistant cold heading steel comprises, by mass percentage content, 0.33-0.43% of C, 0.20-0.50% of Si, 0.35-0.55%of Mn, 0.60-1.00% of Cr, 0.50-0.80% of Ni, 0.20-0.40% of Cu, 0.01-0.10% of V, 0.015-0.040% of Alt, 0.01-0.10% of Re, 0.010-0.030% of P, no greater than 0.0015% of O, no greater than 0.006% of N and the balance Fe and unavoidable impurities. The tensile strength Rm of the high-weather-resistant cold heading steel is less than or equal to 1040 MPa, the yield strength R<p0.2> is less than or equal to 940 MPa, the post-break elongation A is less than or equal to 9%, the area shrinkage Z is less than or equal to 48%, the yield ratio is less than or equal to 0.9, the requirements of the 10.9 gradefastener steel are met, the high weather resistance is achieved, and the production and use are facilitated.

Description

technical field [0001] The invention belongs to the technical field of cold heading steel production, and more specifically relates to a high weather resistance cold heading steel for 10.9 grade fasteners and a production method thereof. Background technique [0002] Cold heading steel is mainly used for the production of fasteners such as bolts, screws, and nuts. my country's railway construction maintains rapid development. The new high-standard railways and the transformation of existing lines into high-speed EMUs, high-power locomotives, and heavy-duty trucks are the most urgent activities. Firmware provides new market demand, and the replacement of in-service equipment on railway lines also provides market space for fasteners. China has a vast territory and complex natural climate environment. With the development of rail transit, higher requirements are put forward for cold heading steel for fasteners. There is an urgent need to develop cold heading steel materials with...

Claims

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Application Information

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IPC IPC(8): C22C33/04C21D8/06C21D9/52C21D6/00C22C38/02C22C38/04C22C38/06C22C38/42C22C38/46B21B1/46B21B37/74
CPCB21B1/463B21B37/74C21D6/004C21D6/005C21D6/008C21D8/065C21D9/525C21D2211/002C21D2211/005C21D2211/009C22C33/04C22C38/001C22C38/002C22C38/005C22C38/02C22C38/04C22C38/06C22C38/42C22C38/46
Inventor 姜婷汪开忠于同仁胡芳忠张晓瑞尹德福龚梦强郭湛许文喜丁雷余良其丁新军
Owner MAANSHAN IRON & STEEL CO LTD
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