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Thermal treatment method for precipitation hardening of martensitic stainless steel FV520B

A martensitic stainless steel, FV520B technology, applied in the field of heat treatment of precipitation hardened martensitic stainless steel FV520B, can solve the problems of low toughness in low temperature tempering, low strength in high temperature tempering, incompatibility of high strength and high toughness, etc., to achieve Effect of heat treatment on energy saving, strength and toughness improvement

Inactive Publication Date: 2009-08-19
NORTHEASTERN UNIV
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Problems solved by technology

[0004] The purpose of the present invention is to provide a heat treatment method for precipitation hardening martensitic stainless steel FV520B, so that the steel has excellent toughness and strength combination, and solve the problem that the existing heat treatment process of the steel has low high-temperature tempering strength and low-temperature tempering toughness. Low, high strength and high toughness can not have both problems

Method used

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Embodiment 1

[0022] A piece of FV520B precipitation hardening martensitic steel is selected. The main components of the steel are shown in Table 1. The original state of the steel is a forged plate with a thickness of (11)mm, and the characteristic temperature of the phase transformation of the steel is tested by a thermal dilatometer: A c1 、A c3 , Ms see Table 2. According to this, steel alloys were tempered at different temperatures and cooling methods, and their tensile properties and impact properties were compared.

[0023] Table 1 Main components of FV520B precipitation hardening martensitic steel

[0024] element C Si mn S P Ni Cr Cu Mo Nb content 0.042 0.335 0.579 0.0016 0.017 5.540 13.80 1.560 1.470 0.391

[0025] Table 2 Phase transformation characteristic temperature of FV520B precipitation hardening martensitic steel

[0026] critical point A c1 A c3 Mrs. temperature °C 589 847 180

[0027] The heat tr...

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Abstract

The invention provides a method for heat-treating precipitation-hardened martensitic stainless steel FV520B, particularly a method adopting the following manner: tempering the precipitation-hardened martensitic stainless steel FV520B at a higher temperature for a short time and then slowly cooling, to lead the precipitation-hardened martensitic stainless steel FV520B to have the advantage of good combination of toughness and strength, and solve the following problems of the existing heat treatment processes: the high-temperature tempering strength is low and the low-temperature tempering toughness is low; as a result, the high strength and the high toughness cannot be achieved at the same time.

Description

technical field [0001] The invention relates to a heat treatment method of precipitation hardening martensitic stainless steel FV520B. Specifically, the precipitation hardening martensite is tempered at a relatively high temperature for a short time, and then slowly cooled to make the precipitation hardening martensite Stainless steel has an excellent combination of toughness and strength. Background technique [0002] Low-carbon precipitation-hardening martensitic stainless steel is widely used because of its easy processing, high strength, good toughness, excellent corrosion resistance and welding performance, good impact toughness and ideal transverse properties on larger sections Used in gears, bolts, shafts, discs, blades, rotors, pump parts, etc. Various components of this type of martensitic stainless steel with excellent performance have been successfully manufactured internationally. However, due to technical confidentiality and other reasons, the details of the ke...

Claims

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Application Information

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IPC IPC(8): C21D6/00C21D1/28C21D1/00
Inventor 周倩青翟玉春
Owner NORTHEASTERN UNIV
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