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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

Inactive Publication Date: 2021-04-06
CSSC NANJING LUZHOU MACHINE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the quenching and tempering temperatures of conventional heat treatment are high, consume a lot of energy, and oil combustion will emit a large amount of harmful gases during quenching, which has a great impact on human health and seriously pollutes the environment
[0004] More importantly, the comprehensive mechanical properties of parts treated by conventional heat treatment methods are very poor, and often cannot meet the design requirements, especially the impact energy does not meet the design specifications, the pass rate is less than 10%, and cracks occur on the surface, resulting in a large amount of scrap

Method used

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  • 1Cr17Ni2 stainless steel screw and heat treatment process thereof
  • 1Cr17Ni2 stainless steel screw and heat treatment process thereof
  • 1Cr17Ni2 stainless steel screw and heat treatment process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027]A stainless steel screw is 1 CR17NI2 material containing the following mass percent components: C 0.11 to 0.17%, Si ≤ 0.80%, Mn ≤ 0.80%, CR 16.00 ~ 18.00%, Ni1.50 ~ 2.50%, P ≤ 0.035%, S ≤ 0.030%, the rest is Fe and inevitable impurity elements.

[0028]A heat treatment process for stainless steel screws, which uses a tuning process, including the following steps:

[0029]The first step, the furnace process: placed the parts that need to be processed in the quenching tool (quenching equipment is a hanging frame), and then the quenching machine is hanged, and the quenching tool is automatically transported to the box resistance furnace. In an effective heating zone, the implementation standard of the effective heating zone measurement method is: GB / T9452, automatically operate the program after setting the parameters after the front desk, automatically opens.

[0030]In the second step, the quenching process begins to be quenched. In the quenching operation, the quenching temperature i...

Embodiment 2

[0045]In this example, the F2000 water-based liquid is carried out by the F2000 water-based liquid as an example of φ38 × 200 mm, φ55 × 200 mm, φ85 mm × 200 mm, respectively, and the F2000 water-based liquid is carried out by the cooling medium in the cooling medium.

[0046]In this embodiment, a connecting box (nitrogen protection) resistor furnace is also employed, the device level is V, and the temperature control accuracy is ± 1 ° C. And use the same manner as the foregoing.

[0047]The heat treatment quenching heating temperature is: 900 ± 10 ° C, and the hi-furnace warming method is from 75 minutes, 100 points, 150 points, and the heat treatment quenching cooling medium is a F2000 water-based liquid, and the quenching water is 30 ° C. The concentration was measured to be 11% and the pH was 7.8. To prevent cracking, control the liquid temperature, i.e., the workpiece is empty after 2 to 3 points.

[0048]Temperature and time: The temper temperature is 650 ± 10 ° C, the holding time is 1...

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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.

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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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/40C21D1/18C21D1/60C21D6/00C21D9/00
CPCC21D1/18C21D1/60C21D6/004C21D6/005C21D6/008C21D9/0068C22C38/002C22C38/02C22C38/04C22C38/40
Inventor 李永茂芦国齐孙晨王国先
Owner CSSC NANJING LUZHOU MACHINE
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