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Post-treatment process of stainless steel bolt

A technology of stainless steel and bolts, which is applied in the field of post-treatment of stainless steel bolts, can solve problems such as rod fracture, bolt turning, brittle fracture, etc., and achieve the effect of increasing service life and improving comprehensive mechanical properties

Inactive Publication Date: 2018-01-12
苏州华丰不锈钢紧固件有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the standard parts of aviation, aerospace, high-speed rail and other industries, high-strength bolts are fasteners that are often assembled and used under conditions of high strength requirements and harsh working environments (such as high vibration, high air humidity, large temperature difference, etc.). At present, my country generally uses medium-carbon low-alloy ultra-high-strength steel to make high-strength bolts (σb≥1500MPa), which are prone to brittle fracture under high stress during use, that is, hydrogen embrittlement can easily lead to unsafe phenomena such as bolt turning and rod fracture. Therefore, the strength performance of the bolt must be further strengthened

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A post-treatment process for stainless steel bolts, specifically comprising the steps of:

[0017] (1) Sandblasting: Preheat the stainless steel bolts to 100°C, and then use sandblasting to remove the oxide layer on the surface of the stainless steel bolts;

[0018] (2) Aging treatment: Put the stainless steel bolts after sandblasting into a high-temperature furnace, then cover the stainless steel bolts with sandblasting, then heat to 565°C and keep it warm for 5 hours;

[0019] (3) Stress relief treatment: lower the temperature of the high-temperature furnace to 180°C and keep it warm for 3 hours;

[0020] (4) Polishing: Remove the stress-relieved bolts, then use clean water to cool and clean the stress-relieved bolts, and then place them in a fine polishing machine for fine polishing;

[0021] (5) Waxing: The operator manually polishes the bolts after fine polishing, and saves them by coloring and waxing.

Embodiment 2

[0023] A post-treatment process for stainless steel bolts, specifically comprising the steps of:

[0024] (1) Sandblasting: Preheat the stainless steel bolts to 150°C, and then use sandblasting to remove the oxide layer on the surface of the stainless steel bolts;

[0025] (2) Aging treatment: Put the stainless steel bolts after sandblasting into a high-temperature furnace, then cover the stainless steel bolts with sandblasting, then heat to 545°C and keep it warm for 8 hours;

[0026] (3) Stress relief treatment: lower the temperature of the high-temperature furnace to 220°C and keep it warm for 2 hours;

[0027] (4) Polishing: Remove the stress-relieved bolts, then use clean water to cool and clean the stress-relieved bolts, and then place them in a fine polishing machine for fine polishing;

[0028] (5) Waxing: The operator manually polishes the bolts after fine polishing, and saves them by coloring and waxing.

Embodiment 3

[0030] A post-treatment process for stainless steel bolts, specifically comprising the steps of:

[0031] (1) Sandblasting: Preheat the stainless steel bolts to 125°C, and then use sandblasting to remove the oxide layer on the surface of the stainless steel bolts;

[0032] (2) Aging treatment: Put the stainless steel bolts after sandblasting into a high-temperature furnace, then cover the stainless steel bolts with sandblasting, then heat to 555°C and keep warm for 6.5h;

[0033] (3) Stress relief treatment: reduce the temperature of the high-temperature furnace to 200°C and keep it warm for 2.5 hours;

[0034] (4) Polishing: Remove the stress-relieved bolts, then use clean water to cool and clean the stress-relieved bolts, and then place them in a fine polishing machine for fine polishing;

[0035] (5) Waxing: The operator manually polishes the bolts after fine polishing, and saves them by coloring and waxing.

[0036] Wherein, the sandblasting in the step (1) and step (2) ...

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PUM

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Abstract

The invention discloses a post-treatment process of a stainless steel bolt. The process comprises the following specific steps of: firstly, preheating the stainless steel bolt to 100-150 DEG C and then removing oxidized layer on the surface of the stainless steel bolt by way of abrasive blasting; then putting the stainless steel bolt after abrasive blasting in a high temperature furnace, then covering the stainless steel bolt by means of abrasive blasting, then heating the stainless steel bolt to 545-565 DEG C and keeping the temperature for 5-8h; then cooling the high temperature furnace to 180-220 DEG C and keeping the temperature for 2-3h; then removing the bolt after destressing treatment, then water cooling and cleaning the bolt after destressing treatment by using clean water and then putting the bolt in a fine polishing machine to be finely polished; and finally, manually polishing the bolt after fine polishing by an operator, and coloring, waxing and storing the bolt. In this way, the comprehensive mechanical properties, particularly strength and hardness, of the stainless steel bolt in a post-treatment link can be improved, and the service life is prolonged greatly.

Description

technical field [0001] The invention relates to a treatment process for bolts, in particular to a post-treatment process for stainless steel bolts. Background technique [0002] In the standard parts of aviation, aerospace, high-speed rail and other industries, high-strength bolts are fasteners that are often assembled and used under conditions of high strength requirements and harsh working environments (such as high vibration, high air humidity, large temperature difference, etc.). At present, my country generally uses medium-carbon low-alloy ultra-high-strength steel to make high-strength bolts (σb≥1500MPa), which are prone to brittle fracture under high stress during use, that is, hydrogen embrittlement can easily lead to unsafe phenomena such as bolt turning and rod fracture. Therefore, the strength performance of bolts must be further strengthened. Contents of the invention [0003] The technical problem mainly solved by the present invention is to provide a post-trea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00
Inventor 徐建华
Owner 苏州华丰不锈钢紧固件有限公司