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Heat treatment method of non-magnetic nickel-free high-chromium stainless steel

A technology of high chromium stainless steel and heat treatment method, applied in heat treatment equipment, quenching agent, manufacturing tools, etc., can solve the problem of weak magnetic properties of stainless steel

Inactive Publication Date: 2021-02-05
深圳市泛海统联精密制造股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Conventional stainless steel heat treatment method, in the process of treatment, a small amount of martensite or ferrite structure is easy to be produced in stainless steel, so that the treated stainless steel has weak magnetic properties

Method used

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  • Heat treatment method of non-magnetic nickel-free high-chromium stainless steel
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  • Heat treatment method of non-magnetic nickel-free high-chromium stainless steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Select non-magnetic nickel-free high chromium stainless steel (X15 CrMnMoN17 11 3) sintered body.

[0030] Place the stainless steel sintered body in a vacuum quenching furnace, evacuate the vacuum quenching furnace, and then set the temperature rise program: room temperature -350°C, heating time 30-60min, holding time 30-60min; 350-850°C, The heating time is 60-90min, and the holding time is 60-90min.

[0031] When the temperature reaches 850° C., nitrogen gas is introduced into the vacuum quenching furnace, and the pressure in the furnace is adjusted to 0.1-0.2 bar.

[0032] Maintain the pressure of 0.1-0.2bar in the vacuum quenching furnace and continue to heat up, 850-1050°C, heating time 60-90min, holding time 60-90min; 1050-1200°C, heating time 90-120min, holding time 90-120min.

[0033] After the holding time is reached, turn on the fan, feed nitrogen with a purity of ≥99.99% into the vacuum quenching furnace at a pressure of 6-12bar, cool to 500-600°C at a spee...

Embodiment 2

[0035] Select non-magnetic nickel-free high chromium stainless steel (X15 CrMnMoN17 11 3) sintered body.

[0036] Place the stainless steel sintered body in a vacuum quenching furnace, evacuate the vacuum quenching furnace, and then set the temperature rise program: room temperature -350°C, heating time 30-60min, holding time 30-60min, 350-850°C, The heating time is 60-90min, and the holding time is 60-90min.

[0037] When the temperature reaches 850° C., nitrogen gas is introduced into the vacuum quenching furnace, and the pressure in the furnace is adjusted to 0.2-0.4 bar.

[0038] Maintain the pressure of 0.2-0.4bar in the vacuum quenching furnace and continue to heat up, 850-1050°C, heating time 60-90min, holding time 60-90min, 1050-1200°C, heating time 90-120min, holding time 90-120min.

[0039] After the holding time is reached, turn on the fan, feed nitrogen with a purity of ≥99.99% into the vacuum quenching furnace at a pressure of 6-12bar, cool to 500-600°C at a spee...

Embodiment 3

[0041] Select non-magnetic nickel-free high chromium stainless steel (X15 CrMnMoN17 11 3) sintered body.

[0042] Place the stainless steel sintered body in a vacuum quenching furnace, evacuate the vacuum quenching furnace, and then set the temperature rise program: room temperature -350°C, heating time 30-60min, holding time 30-60min, 350-850°C, The heating time is 60-90min, and the holding time is 60-90min.

[0043] When the temperature reaches 850° C., nitrogen gas is introduced into the vacuum quenching furnace, and the pressure in the furnace is adjusted to 0.4-0.6 bar.

[0044] Maintain the pressure of 0.4-0.6bar in the vacuum quenching furnace and continue to heat up, 850-1050°C, heating time 60-90min, holding time 60-90min, 1050-1200°C, heating time 90-120min, holding time 90-120min.

[0045] After the holding time is reached, turn on the fan, feed nitrogen with a purity of ≥99.99% into the vacuum quenching furnace at a pressure of 6-10bar, cool to 500-600°C at a spee...

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Abstract

The invention discloses a heat treatment method of non-magnetic nickel-free high-chromium stainless steel. The heat treatment method comprises the following steps of (1), putting stainless steel intoa vacuum quenching furnace, and carrying out gradient heating to 850 DEG C; (2), maintaining the temperature at 850 DEG C, introducing nitrogen into the vacuum quenching furnace, and adjusting the pressure in the furnace to 0.1-0.6 bar; (3), maintaining the pressure of 0.1-0.6 bar, and continuously carrying out gradient heating to 1200 DEG C; and (4), introducing nitrogen with the purity larger than or equal to 99.99% into the vacuum quenching furnace at the pressure of 6-12 bar for cooling. According to the method, high-purity nitrogen with specific pressure is introduced in the specific stage of the heat treatment process, so that austenite can be normally generated in the heat treatment process of the nickel-free stainless steel; and high-purity high-pressure nitrogen with specific pressure is used for quenching treatment, a corresponding austenite structure is obtained, meanwhile, martensite and ferrite which are difficult to avoid in the common heat treatment process are greatly reduced, and therefore magnetism of stainless steel is avoided.

Description

technical field [0001] The invention relates to the technical field of metal processing, in particular to a heat treatment method for non-magnetic, nickel-free, high-chromium stainless steel. Background technique [0002] With the development of science and technology, people put forward higher requirements for 3C electronic products and smart wearable products, and ordinary stainless steel is far from meeting people's needs. The non-magnetic property can keep 3C electronic products from being interfered by magnetism on the signal, and the communication ability is stronger, and nickel-free can save people who are allergic to nickel from the pain of nickel allergy. Therefore, non-magnetic nickel-free stainless steel is gradually entering the market. [0003] The heat treatment of stainless steel is to change its physical properties, mechanical properties, residual stress and restore the corrosion resistance that has been seriously affected by pre-processing and heating, so as...

Claims

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Application Information

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IPC IPC(8): C21D1/18C21D1/613C21D1/74
CPCC21D1/18C21D1/613C21D1/74C21D2211/001
Inventor 杨虎赵小杨陈开付侯春伟
Owner 深圳市泛海统联精密制造股份有限公司