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A stainless steel pipe doped with element cerium p92 and its post-welding cycle heat treatment method

A heat treatment method and a technology of doping elements, which are applied in heat treatment furnaces, heat treatment equipment, furnaces, etc., can solve the problems that the performance of P91 steel cannot meet the production requirements, so as to improve the degree of solid solution strengthening, increase the tensile strength and durable strength, The effect of internal tissue homogenization

Active Publication Date: 2022-02-22
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] With the development of ultra-supercritical thermal power generation units, the performance of P91 steel has gradually failed to meet production requirements

Method used

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  • A stainless steel pipe doped with element cerium p92 and its post-welding cycle heat treatment method
  • A stainless steel pipe doped with element cerium p92 and its post-welding cycle heat treatment method
  • A stainless steel pipe doped with element cerium p92 and its post-welding cycle heat treatment method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] The chemical composition and mass percentage of the doped element cerium P92 steel pipe are: C (0.112), Cr (8.831), Ni (0.235), Mn (0.409), W (1.936), Mo (0.386), V (0.209), Si (0.241), balance Fe and unavoidable impurity elements.

[0061] The post-weld heat treatment method for steel pipes as described above includes five steps of temperature rise 1, heat preservation 2, temperature rise 3, heat preservation 4, and temperature reduction 5 steps. step.

[0062] Step 1 of temperature rise includes raising the temperature of the steel pipe from 25°C to preheat the welded steel pipe to 165°C and keep it warm for 10 hours. The temperature rise rate during the preheating process is 140°C per hour.

[0063] The heat preservation 2 step includes heat preservation of the treated steel pipe at 165° C. for 16.5 hours.

[0064] The 3rd step of heating includes raising the treated steel pipe from 165°C; then raising the temperature of the steel pipe to 760°C and keeping it warm ...

Embodiment 2

[0068] The chemical composition and mass percentage of the doped element cerium P92 steel pipe are: C (0.112), Cr (8.831), Ni (0.235), Mn (0.409), W (1.936), Mo (0.386), V (0.209), Si(0.241), Ce(0.1), balance Fe and unavoidable impurity elements.

[0069] The post-weld heat treatment method for steel pipes as described above includes five steps of temperature rise 1, heat preservation 2, temperature rise 3, heat preservation 4, and temperature reduction 5 steps. step.

[0070] Step 1 of temperature rise includes raising the temperature of the steel pipe from 25°C to preheat the welded steel pipe to 165°C and keep it warm for 10 hours. The temperature rise rate during the preheating process is 140°C per hour.

[0071] The heat preservation 2 step includes heat preservation of the treated steel pipe at 165° C. for 16.5 hours.

[0072] The 3rd step of heating includes raising the treated steel pipe from 165°C; then raising the temperature of the steel pipe to 760°C and keeping ...

Embodiment 3

[0076] The chemical composition and mass percentage of the doped element cerium P92 steel pipe are: C (0.112), Cr (8.831), Ni (0.235), Mn (0.409), W (1.936), Mo (0.386), V (0.209), Si(0.241), Ce(0.2), balance Fe and unavoidable impurity elements.

[0077] The post-weld heat treatment method for steel pipes as described above includes five steps of temperature rise 1, heat preservation 2, temperature rise 3, heat preservation 4, and temperature reduction 5 steps. step.

[0078] Step 1 of temperature rise includes raising the temperature of the steel pipe from 25°C to preheat the welded steel pipe to 165°C and keep it warm for 10 hours. The temperature rise rate during the preheating process is 140°C per hour.

[0079] The heat preservation 2 step includes heat preservation of the treated steel pipe at 165° C. for 16.5 hours.

[0080] The 3rd step of heating includes raising the treated steel pipe from 165°C; then raising the temperature of the steel pipe to 760°C and keeping ...

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Abstract

The invention discloses a stainless steel pipe doped with element cerium P92 and a post-welding cycle heat treatment method thereof. The stainless steel pipe doped with cerium element after welding is preheated and heat-insulated; the treated steel pipe is heated and heat-insulated; and then Heat the steel pipe to 830-850°C and keep it warm for 0.4-0.6 hours; cool the steel pipe to 750-770°C and keep it warm for 0.4-0.6 hours; repeat the above two cycles of heating and cooling; then heat preservation treatment, and then cool the steel pipe to room temperature, Complete the post-weld cycle heat treatment of P92 stainless steel pipe doped with cerium. The present invention is based on the composition of P92 steel, by adding an appropriate amount of rare earth element cerium, and adopting the cyclic heat treatment method listed in the present invention, the formation and growth of δ ferrite in the structure are inhibited, the degree of solid solution strengthening is increased, and the structure is improved. Structure, improve the tensile strength and durability of the material.

Description

technical field [0001] The invention belongs to the technical field of mechanical processing, and in particular relates to a stainless steel pipe doped with element cerium P92 and a post-welding cycle heat treatment method thereof. Background technique [0002] With the development of ultra-supercritical thermal power generation units, the performance of P91 steel has gradually failed to meet production requirements. On the basis of the alloy composition of P91 steel, 1.5% to 2.0% W is added to replace part of Mo to improve the effect of solid solution strengthening. At the same time, a small amount of B is added to develop a new type of P92 steel for the high temperature section of supercritical boilers. [0003] Rare earth elements are known as "industrial vitamins". The content of cerium in the earth's crust is about 0.0046%, which is the highest abundance among rare earth elements. Widely used in metallurgy, petrochemical and new materials and other fields. [0004] Th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D9/50C21D6/00C21D1/78C22C38/02C22C38/04C22C38/44C22C38/46
CPCC21D9/50C21D1/785C21D6/004C21D6/005C21D6/008C22C38/04C22C38/44C22C38/46C22C38/02C22C38/005
Inventor 皇志富许容博王瑜坚永鑫
Owner XI AN JIAOTONG UNIV
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