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Atmosphere-corrosion-resistant high-strength bolt and manufacturing method thereof

A technology of atmospheric corrosion-resistant and high-strength bolts, which is applied to bolts, manufacturing tools, screws, etc., can solve problems such as endangering national defense construction, poor atmospheric corrosion resistance of 42CrMo bolt steel, and national economic losses.

Inactive Publication Date: 2020-05-15
南京福贝尔五金制品有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Different metal materials are inevitably corroded during service, and the corrosion of high-strength bolts caused by the atmospheric environment is the most common one. It will not only cause huge losses to the national economy, but also endanger the National defense construction, my country's annual economic losses due to atmospheric corrosion account for more than half of my country's economic losses, while the traditional 42CrMo bolt steel has poor atmospheric corrosion resistance and cannot meet its use requirements. Therefore, the most effective way is to improve the corrosion resistance of metal materials. Atmospheric corrosion resistance, it is necessary to research and develop high-strength weather-resistant bolt steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A high-strength bolt resistant to atmospheric corrosion, comprising the following components, in terms of mass percentage, C: 0.20; Si: 0.15; Mn: 0.70; P: 0.025; S: 0.01; Ni: 0.20; Cr: 0.45; Cu: 0.20 ; Mo: 0.15; B: 0.0030; Als: 0.015; Zr: 0.015; Re: 0.01; Nb: 0.10; gas content in bolts: [N]≤0.008%, [H]≤0.0002%;

[0029] A method for manufacturing high-strength bolts resistant to atmospheric corrosion, comprising the following steps:

[0030] S01, hot forging;

[0031] S02, Precipitation phase adjustment treatment: heat the bolts formed by S01 at 1100°C for 30 minutes, and quickly air-cool to room temperature after the heat preservation, so that the fine second phase particles are fully and evenly dispersed and precipitated and distributed on the tissue matrix of the bolts;

[0032] S03, high-temperature quenching: high-temperature quenching is adopted after the precipitation phase adjustment treatment, and heated at 860°C to austenitize. The heating and holding time of...

Embodiment 2

[0041] A high-strength bolt resistant to atmospheric corrosion, comprising the following components, in terms of mass percentage, C: 0.40; Si: 0.50; Mn: 1.20; P: 0.020; S: 0.008; Ni: 0.50; Cr: 0.80; Cu: 0.50 ; Mo: 0.50; B: 0.0025; Als: 0.020; Zr: 0.045; Re: 0.045;

[0042] A method for manufacturing high-strength bolts resistant to atmospheric corrosion, comprising the following steps:

[0043] S01, spheroidizing annealing cold heading forming;

[0044] S02, Precipitation Phase Adjustment Treatment: Heat and hold the bolt formed by S01 at 1100°C for 30 minutes, and quickly air-cool to room temperature after the heat preservation is completed, so that the fine second phase particles are fully and uniformly dispersed and precipitated and distributed on the tissue matrix of the bolt;

[0045] S03, high-temperature quenching: high-temperature quenching is adopted after the precipitation phase adjustment treatment, and heated at 860°C to make austenitization. The heating and holdi...

Embodiment 3

[0054] A high-strength bolt resistant to atmospheric corrosion, comprising the following components, in terms of mass percentage, C: 0.30; Si: 0.30; Mn: 0.90; P: 0.015; S: 0.005; Ni: 0.40; Cr: 0.60; Cu: 0.35 ; Mo: 0.35; B: 0.002; Als: 0.03; Zr: 0.03; Re: 0.02; Ti: 0.09; gas content in bolts: [N]≤0.008%, [H]≤0.0002%;

[0055] A method for manufacturing high-strength bolts resistant to atmospheric corrosion, comprising the following steps:

[0056] S01, hot forging;

[0057] S02, Precipitation Phase Adjustment Treatment: heat and hold the bolts formed by S01 at 1000°C for 30 minutes, and quickly air-cool to room temperature after the heat preservation is completed, so that the fine second phase particles are fully and uniformly dispersed and precipitated and distributed on the tissue matrix of the bolt;

[0058] S03, high-temperature quenching: high-temperature quenching is adopted after the precipitation phase adjustment treatment, heated at 880°C to austenitize, each group of...

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Abstract

The invention discloses an atmosphere-corrosion-resistant high-strength bolt. The atmosphere-corrosion-resistant high-strength bolt is characterized by comprising, by mass, 0.20-0.40% of C, 0.15-0.50%of Si, 0.70-1.20% of Mn, 0.025% or less of P, 0.01% or less of S, 0.20-0.50% of Ni, 0.45-0.80% of Cr, 0.20-0.50% of Cu, 0.15-0.50% of Mo, 0.0030% or less of B, 0.015% or more of Als, 0.015-0.045% ofZr, and 0.01-0.045% of Re. The invention also provides a manufacturing method of the atmospheric-corrosion-resistant high-strength bolt. The method includes the steps of forming, precipitated phase adjustment treatment, high-temperature quenching, two-stage tempering and machining, thread rolling, and alramenting treatment. The obtained bolt has the tensile strength higher than 1000 MPa, the section shrinkage not less than 35%, the percentage elongation after fracture not less than 10% and the -20 DEG C impact energy not less than 41 KV<2> / J, and has the advantages of high tensile strength, good toughness and plasticity and excellent atmospheric corrosion resistance.

Description

technical field [0001] The invention relates to an atmospheric corrosion-resistant high-strength bolt and a manufacturing method thereof, belonging to the technical field of alloy materials. Background technique [0002] Corrosion of different metal materials is inevitable during the service process. At the same time, the corrosion of high-strength bolts caused by the atmospheric environment is the most common one. It will not only cause huge losses to the national economy, but also endanger the National defense construction, my country's annual economic losses due to atmospheric corrosion account for more than half of my country's economic losses, and the traditional 42CrMo bolt steel has poor atmospheric corrosion resistance and cannot meet its use requirements. Therefore, the most effective way is to improve the corrosion resistance of metal materials. Atmospheric corrosion resistance, it is necessary to research and develop high-strength weather-resistant bolt steel. Con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/42C22C38/44C22C38/54C22C38/06C22C38/50C22C38/48C22C38/46C21D9/00C21D1/18F16B33/06F16B33/00F16B35/00
CPCC21D1/18C21D9/0093C21D2211/004C21D2211/008C22C38/005C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/54F16B33/008F16B33/06F16B35/00
Inventor 马金锁赵秀明侯华兴张先鸣黄华杨周杨益春龚国强林田子谢家成许莉钧王桂娟王加杰
Owner 南京福贝尔五金制品有限公司