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Heat treatment process of duplex stainless steel composite plate

A duplex stainless steel and clad plate technology, applied in heat treatment furnaces, heat treatment equipment, manufacturing tools, etc., can solve the problems of large performance loss of carbon steel structures, unfavorable product applications, etc., and achieve the effect of ensuring structural performance and corrosion resistance

Inactive Publication Date: 2021-06-04
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for the rolled-formed composite plate, the structural performance of carbon steel will be lost too much if the heat treatment is carried out above 1040°C, which is not conducive to the application of the product.

Method used

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  • Heat treatment process of duplex stainless steel composite plate
  • Heat treatment process of duplex stainless steel composite plate
  • Heat treatment process of duplex stainless steel composite plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Step 1: Using a trolley-type heating furnace, first raise the temperature of the heating furnace to 500°C;

[0019] Step 2: Put the sample into the heating furnace, wait for the temperature to rise to 500°C, and keep it warm for 84 minutes;

[0020] Step 3: Take the sample out of the heating furnace and air cool;

[0021] The microstructure of the duplex stainless steel finally obtained in this embodiment is as follows: figure 1 As shown at 500°C, the austenite content is 46.95%, and there is no harmful second phase precipitated at the phase interface between austenite and ferrite. Pitting corrosion test, the surface is smooth and bright, no pitting pits appear, the sample passed the pitting corrosion test.

Embodiment 2

[0023] Step 1: Using a trolley-type heating furnace, first raise the temperature of the heating furnace to 520°C;

[0024] Step 2: Put the sample into the heating furnace, wait for the temperature to rise to 520°C, and keep it warm for 62 minutes;

[0025] Step 3: Take the sample out of the heating furnace and air cool;

[0026] The microstructure of the duplex stainless steel finally obtained in this embodiment is as follows: figure 1 As shown at 520°C, the austenite content is 45.93%, and there is no harmful second phase precipitated at the phase interface between austenite and ferrite. Pitting corrosion test, the surface is smooth and bright, no pitting pits appear, the sample passed the pitting corrosion test.

Embodiment 3

[0028] Step 1: Using a trolley heating furnace, first raise the temperature of the heating furnace to 540°C;

[0029] Step 2: Put the sample into the heating furnace, wait for the temperature to rise to 540 ° C, and keep it for 93 minutes;

[0030] Step 3: Take the sample out of the heating furnace and air cool;

[0031] The microstructure of the duplex stainless steel finally obtained in this embodiment is as follows: figure 1 As shown at 540°C, the austenite content is 50.60%, and there is no harmful second phase precipitated at the phase interface between austenite and ferrite. Pitting corrosion test, the surface is smooth and bright, no pitting pits appear, the sample passed the pitting corrosion test.

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Abstract

The invention discloses a heat treatment process of a duplex stainless steel composite plate. The heat treatment process comprises the steps that (1) the temperature of a heat treatment furnace is increased to 500-600 DEG C; (2) the composite plate is fed, timing is carried out, and the heat preservation time is 2-4 min / mm; and (3) after the heat preservation time is ended, the composite plate is directly discharged from the furnace to be subjected to air cooling, or furnace cooling is carried out according to carbon steel heat treatment requirements. In the process, the stainless steel composite plate is subjected to tempering heat treatment at the temperature of 500-600 DEG C, and the cooling speed is not limited at all. On one hand, generation of the sigma phase and carbide can be effectively avoided, and corrosion resistance of duplex stainless steel is guaranteed; and on the other hand, heat treatment delivery conditions of a base material can be met, and structural performance of carbon steel is guaranteed.

Description

technical field [0001] The invention relates to a heat treatment process, in particular to a heat treatment process for a duplex stainless steel clad plate. Background technique [0002] The rolled clad clad steel plate not only has the strength and toughness of the base material, but also has the corrosion resistance and wear resistance of the clad material. Compared with the pure stainless steel plate and the carbon steel coated steel plate, it has obvious mechanical properties and cost advantages. Widely used in petroleum, chemical industry, electric power and other important fields. The production process takes the overlapping part of the carbon steel and stainless steel processing windows. When the base carbon steel needs to be hot-rolled and then heat-treated before delivery, the stainless steel layer will inevitably follow the heat treatment, and its functionality will decline. [0003] The heat treatment process of duplex stainless steel has a great influence on the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/00C21D9/00B21B1/38C22C38/02C22C38/04C22C38/44C22C38/12C22C38/14
CPCC21D1/00C21D9/0081B21B1/38C22C38/02C22C38/04C22C38/44C22C38/12C22C38/14C22C38/001B21B2001/386
Inventor 周玉伟曾周燏陈颜堂蔡佳兴
Owner NANJING IRON & STEEL CO LTD
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