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Stainless steel tube doped with element cerium P92 and post-welding circulating heat treatment method thereof

A heat treatment method and a technology of doping elements, applied in heat treatment furnaces, heat treatment equipment, furnace types, 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, inhibit the formation and growth, and improve Effect of Tensile Strength and Endurance Strength

Active Publication Date: 2021-06-15
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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  • Stainless steel tube doped with element cerium P92 and post-welding circulating heat treatment method thereof
  • Stainless steel tube doped with element cerium P92 and post-welding circulating heat treatment method thereof
  • Stainless steel tube doped with element cerium P92 and post-welding circulating heat treatment method thereof

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 tube doped with element cerium P92 and a post-welding circulating heat treatment method thereof. The post-welding circulating heat treatment method comprises the steps that the post-welding stainless steel tube doped with element cerium is preheated and subjected to heat preservation treatment; the treated steel tube is heated and subjected to heat preservation treatment; then the steel tube is heated to 830-850 DEG C, and heat preservation is conducted for 0.4-0.6 h; the steel tube is cooled to 750-770 DEG C, and the heat preservation is conducted for 0.4-0.6 h; the two cycles of heating and cooling are repeated; and then heat preservation treatment is conducted, the steel tube is cooled to the room temperature, and post-welding circulating heat treatment of the stainless steel tube doped with the element cerium P92 is completed. According to the stainless steel tube doped with the element cerium P92 and the post-welding circulating heat treatment method thereof, on the basis of P92 steel components, a proper amount of rare earth element cerium is added, the circulating heat treatment method is adopted, so that formation and growth of delta ferrite in a tissue are inhibited, the solid solution strengthening degree is improved, the tissue structure is improved, and the tensile strength and endurance strength of the material are improved.

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 Applications(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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