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High-temperature forged martensitic stainless steel heat treatment method

A technology of martensitic stainless steel and heat treatment method, which is applied in the field of high temperature forging martensitic stainless steel heat treatment, can solve the problem of difficulty in obtaining the 440-type molten filler metal, reduce the number of quenching and tempering, save energy, avoid effect of stress

Active Publication Date: 2014-04-23
隆英(常州)特钢科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The standard martensitic stainless steels are: Types 403, 410, 414, 416, 416(Se), 420, 431, 440A, 440B and 440C, which are magnetic; the corrosion resistance of these steels comes from "chromium", which ranges from 11.5 to 18%, the steel with higher chromium content needs higher carbon content to ensure the formation of martensite during heat treatment. The above three types of 440 stainless steel are rarely considered as applications that require welding, and the composition of type 440 Filler metal is not easy to obtain

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Embodiment 1

[0020] Embodiment 1: as attached figure 2 As shown, after the forging is put into the furnace, the furnace temperature is raised, and the heating rate is less than or equal to 75°C / hour; when the furnace temperature rises to 500°C, the forging is kept for 1 hour; When the temperature rises to 860°C, keep the forgings warm for 1 hour, and continue heating the furnace at a heating rate of 35°C / hour. When heated to 1010-1038°C, keep the forgings for 4-5 hours after soaking; hang the forgings out of the furnace and air-cool to room temperature; if attached image 3 As shown, the first tempering: when the forging is put into the furnace, the furnace temperature is raised at a rate of less than or equal to 70°C / hour; when the furnace temperature is raised to 691-718°C, the forging is kept warm for 5.5-7 hours; the forging is lifted out of the heat treatment furnace Air cool to room temperature; if attached Figure 4 As shown, the second tempering: when the forging is put into the...

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Abstract

The invention relates to a high-temperature forged martensitic stainless steel heat treatment method. The method comprises the following steps: placing a forged piece into a furnace, and then performing solid dissolution, first tempering and second tempering for heat treatment; and by selecting the temperature of the heat treatment process, the time control and heat treatment equipment, the requirements of mechanical properties of clients are met, the number of times of quenching and tempering is reduced, and the energy is saved. By adopting an air cooling process and two-section tempering, the precipitation of residual austenitic items is avoided; and by directly heating to the hot melting temperature for austenitizing, then performing air-cooling and selecting the reasonable tempering temperature, the production of stress is avoided, and the performances of material from normal temperature to high temperature are stabilized according to memory principles.

Description

technical field [0001] The invention relates to a heat treatment technology for stainless steel materials, in particular to a heat treatment process for a high-temperature forged martensitic stainless steel ASTM A182-F6NM forging, especially a heat treatment method for a high-temperature forged martensitic stainless steel. Background technique [0002] Martensitic stainless steel is a type of stainless steel whose mechanical properties can be adjusted by heat treatment such as quenching and tempering. In layman's terms, it is a type of hardenable stainless steel. Typical grades are Cr13 type, such as 2Cr13, 3Cr13, 4Cr13 and so on. After quenching, the hardness is higher, and different tempering temperatures have different combinations of strength and toughness. It is mainly used for steam turbine blades, tableware, and surgical instruments. According to the difference in chemical composition, martensitic stainless steel can be divided into two types: martensitic chromium st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D6/00C21D8/00
Inventor 占凯赵以平杨建国
Owner 隆英(常州)特钢科技有限公司
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