1Cr17Ni2 stainless steel screw and heat treatment process thereof

A stainless steel and screw technology, applied in heat treatment furnaces, heat treatment equipment, manufacturing tools, etc., can solve the problems of impact energy not reaching the design index, poor mechanical properties, and large amount of scrap, so as to reduce the risk of quenching deformation and cracking, Reduce the stress of martensitic transformed tissue and ensure the safety of personnel and equipment
CN112609124AInactive Publication Date: 2021-04-06CSSC NANJING LUZHOU MACHINE
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
CSSC NANJING LUZHOU MACHINE
Publication Date
2021-04-06
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a heat treatment process development and improvement method of a martensitic stainless steel 1Cr17Ni2 screw. The process comprises a charging procedure, a quenching procedure, a quenching cooling procedure and a tempering and tempering cooling procedure. According to the heat treatment process method, by improving heat treatment process parameters such as the quenching temperature, the tempering temperature and the quenching medium, the quenching temperature and the tempering temperature are greatly reduced, original oil medium quenching is changed into F2000 water-based liquid quenching, the using temperature of water-based liquid is strictly controlled, an austenitized workpiece is rapidly immersed into the water-based liquid to be cooled, and accordingly, martensite transformation is achieved. According to the process, the mechanical property index of 1Cr17Ni2 material products is improved, the one-time qualification rate is greatly increased and reaches 98% or above, due to the fact that the quenching temperature and the tempering temperature are greatly reduced, the electricity consumption cost is greatly reduced, the problem that original heat treatment parts are directly scrapped and cannot be produced due to cracks generated on the surfaces is solved, and performance indexes meet the requirements of design drawings after the process is improved. The water-based liquid is used for cooling, so that environmental pollution is avoided, and the medium consumption cost is reduced.
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Description

Technical field

[0001] The present invention relates to a heat treatment process of 1Cr17NI2 martensite stainless steel part, and more particularly to a cooled cooled by F2000 water-based rod part with austenitated martensite stainless steel, and complete the heat treatment of martensite transition. Process, belongs to the technical field of heat treatment process.Background technique

[0002] 1Cr17Ni2 material is a martensite stainless steel with high strength and toughness, and the hardenability is also better, as well as significant tempering brittleness. 1Cr17Ni2 material is widely used in engineering anchor brake screw or screw parts, the material technology requirements generally tempered, the performance indicator parameters of design drawings are generally: tensile strength Rm ≥ 780 MPa, yield strength rp0.2 ≥ 590MPa, elongation A≥15%, impact power AKU≥39j, hardness HB ≥ 229.

[0003] The conventional heat treatment process generally uses a quenching temperature of 980 to 1000 ° C, qu...

Claims

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