Production process for quenching and tempering high-strength stainless steel fastener

Abstract

The invention discloses a production process for quenching and tempering a high-strength stainless steel fastener. The process comprises process steps that a product is put into an annealing furnace for annealing treatment, cooled to 350-400 DEG C along with the furnace, and taken out for air cooling; quenching is conducted, specifically, the pretreated workpiece is put into a high-temperature furnace, heated to 840-860 DEG C, subjected to heat preservation for 0.5-1 h, then heated to 1080-1100 DEG C and subjected to heat preservation for 2-3 h, after heat preservation is completed, rapid discharging is conducted, the workpiece enters a quenching tank to be cooled in an oil cooling mode to 150-200 DEG C, and then the workpiece is taken out to be subjected to air cooling; tempering is conducted, specifically, the quenched workpiece is put into the high-temperature furnace, heated to 320-380 DEG C and subjected to heat preservation for 0.5 h, then heated to 580-620 DEG C and subjected toheat preservation for 1-2 h, after heat preservation is completed, the workpiece is cooled to 200-240 DEG C along with the furnace, and then the workpiece is taken out and put into air to be cooled for 2 h; the workpiece is put into alkaline solution to be subjected to descaling treatment, the descaling time ranges from 10 min to 20 min, and finally the workpiece is cleaned, dried and packaged. The process is advantaged in that the original structure refining grain size of the stainless steel heat-resistant steel forge piece can be improved, and the quenching and tempering treatment effect isimproved.

Description

Technical field [0001] The invention relates to the technical field of quenching and tempering treatment, in particular to a production process for the quenching and tempering treatment of high-strength stainless steel fasteners. Background technique [0002] With the rapid development of science and technology in China and the continuous improvement of the equipment manufacturing industry, the petroleum and petrochemical, aerospace and shipbuilding industries are developing in clusters. In order to meet the needs of lightweight and corrosion resistance, stainless steel fasteners are used instead of alloy steel and carbon. Steel fasteners are the direction of development today and in the future. Stainless steel fasteners are usually quenched and tempered to improve their mechanical properties such as strength, plasticity and toughness. The current quenching and tempering process is a simple quenching and tempering process. This simple quenching and tempering method has insufficie...

AI Technical Summary

Problems solved by technology

[0002] With the rapid development of science and technology in our country, the level of equipment manufacturing industry has been continuously improved, and industries such as petroleum and petrochemical, aerospace and shipbuilding have developed in clusters. In order to meet the needs of lightweight and corrosion resistance, stainless steel fasteners are used to replace alloy steel and carbon Steel fasteners are the direction of current and future development. Stainless steel fasteners usually adopt quenching and tempering treatment to improve their mechanical properties such as strength, plasticity and toughness. The current quenching and tempering treatment process is simply one quenching and one tempering. The hardness and strength of the products obtained by this simple quenching and tempering treatment method are insufficient, and the scrap rate is high. Therefore, we propose a production process for quenching and tempering treatment of high-strength stainless steel fasteners to solve the above problems