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P91 material welding and heat treatment method

A heat treatment method, P91 technology, applied in steel material welding and heat treatment, P91 material welding and heat treatment field, can solve the problem of high residual stress in welded joints, improve structure and performance, improve oxidation resistance and high temperature steam corrosion resistance, Effect of Reducing Residual Stress

Inactive Publication Date: 2018-06-19
NANJING DUBLE METAL EQUIP ENG +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The main purpose of the present invention is to provide a P91 material welding and heat treatment method, solve the problem of high residual stress in the welded joint, and improve the structure and performance of the weld metal

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Embodiment Construction

[0034] In order to make the technical solutions of the present invention clearer and clearer to those skilled in the art, the present invention will be further described in detail below in conjunction with the examples and accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0035] Such as figure 1 and figure 2 As shown, a kind of P91 material welding and heat treatment method provided in this embodiment includes the following steps:

[0036] Step 1: Preheat

[0037] Set the preheating temperature to 150-200°C and keep it warm for 0.5h;

[0038] Step 2: Soldering

[0039] Use GTAW welding, set the welding current to 130-180A, set the welding voltage to 10-14V, and protect the back of the weld with argon gas with a purity of 99.99%;

[0040] Or use SMAW welding, set the welding current to 160-180A, set the welding voltage to 21-24V, and control the interlayer temperature at 200-250°C;

[0041] Step 3: Keep warm and cool slowly

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Abstract

The invention discloses a P91 material welding and heat treatment method and belongs to the technical field of steel material treatment. The method comprises the steps of (1) conducting preheating andheat preservation; (2) adopting GTAW or SMAW welding and setting the welding current and voltage; (3) conducting heat preservation and slow cooling immediately after welding; (4) putting a material into a furnace to conduct postwelding heat treatment immediately after the weld seam temperature is controlled to be 100 DEG C or above, conducting heating and heat preservation and conducting slow cooling in the furnace; and (5) dropping the temperature to 300 DEG C and opening a furnace door to conduct cooling in the static air to the indoor temperature. Through the P91 material welding and heattreatment method, the problem that the residual stress of welded joints is high is solved; the residual stress of the weld joints is effectively reduced; the metal structure and performance of weld seams are improved; the oxidation resistance and high-temperature steam corrosion resistance of the P91 material are improved, so that the P91 material has good impact toughness and high and stable rupture ductility and thermal strength properties. The allowable stress of the P91 material is higher than that of austenitic stainless steel when the usage temperature is lower than 620 DEG C.

Description

technical field [0001] The invention relates to a steel material welding and heat treatment method, in particular to a P91 material welding and heat treatment method, and belongs to the technical field of steel material treatment. Background technique [0002] P91 material, namely 9Cr-1Mo steel material, is a new type of martensitic heat-resistant steel developed in the United States in the late 1970s and early 1980s. It is famous for its thermal expansion coefficient, elastic modulus, creep performance and oxidation resistance. Excellent, it has been widely used in the main steam pipes of power stations in many countries. In my country, the application of P91 steel has already begun. , in 1996 put forward the suggestion of recommending the use of P91 steel in our country, therefore, it has become an inevitable trend to use P91 steel in large thermal power generating units. [0003] In recent years, P91 steel has been widely used in the main steam pipes and reheating hot sect...

Claims

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Application Information

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IPC IPC(8): B23K9/00B23K9/167B23K9/235C21D9/50
CPCB23K9/00B23K9/167B23K9/235C21D9/50C21D2211/008
Inventor 魏康黄文马冲冯志刚吴小玲成一冰
Owner NANJING DUBLE METAL EQUIP ENG
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