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    PWHT Requiment

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    This document summarizes post-weld heat treatment (PWHT) requirements for various materials according to different ASME B31 codes. It lists the material types, applicable thickness ranges that require PWHT, and minimum hardness requirements. Key points include: - Carbon steel over 20mm thickness requires PWHT according to ASME B31.3. - Various alloy steels over certain thickness thresholds require PWHT, with minimum hardness requirements ranging from 225 to 241 BHN depending on the specific alloy steel. - High alloy martensitic steels over 32mm thickness and certain nickel alloys over 20mm require PWHT according to the codes.

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    PWHT Requiment

    Uploaded by

    youtube플래티넘
    26 views1 page
    This document summarizes post-weld heat treatment (PWHT) requirements for various materials according to different ASME B31 codes. It lists the material types, applicable thickness ranges that require PWHT, and minimum hardness requirements. Key points include: - Carbon steel over 20mm thickness requires PWHT according to ASME B31.3. - Various alloy steels over certain thickness thresholds require PWHT, with minimum hardness requirements ranging from 225 to 241 BHN depending on the specific alloy steel. - High alloy martensitic steels over 32mm thickness and certain nickel alloys over 20mm require PWHT according to the codes.

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    This document summarizes post-weld heat treatment (PWHT) requirements for various materials according to different ASME B31 codes. It lists the material types, applicable thickness ranges that require PWHT, and minimum hardness requirements. Key points include: - Carbon steel over 20mm thickness requires PWHT according to ASME B31.3. - Various alloy steels over certain thickness thresholds require PWHT, with minimum hardness requirements ranging from 225 to 241 BHN depending on the specific alloy steel. - High alloy martensitic steels over 32mm thickness and certain nickel alloys over 20mm require PWHT according to the codes.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    26 views1 page

    PWHT Requiment

    Uploaded by

    youtube플래티넘
    This document summarizes post-weld heat treatment (PWHT) requirements for various materials according to different ASME B31 codes. It lists the material types, applicable thickness ranges that require PWHT, and minimum hardness requirements. Key points include: - Carbon steel over 20mm thickness requires PWHT according to ASME B31.3. - Various alloy steels over certain thickness thresholds require PWHT, with minimum hardness requirements ranging from 225 to 241 BHN depending on the specific alloy steel. - High alloy martensitic steels over 32mm thickness and certain nickel alloys over 20mm require PWHT according to the codes.

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    PIPING PWHT REQUIREMENT

    ASME B31.3 ASME B31.4 ASME B31.8


    REMARKS
    (2010 edition) (2006 edition) (2010 edition)
    MATERIAL
    Hard
    Para. 331.1.1 Table 1 P No Para. 434.8.9 Para. 825.2
    (BHN)

    Carbon Steel ＞20 mm(3/4") THK 1 -

    Alloy Steel > 20 mm(3/4") THK,


    3 225
    Cr ≤ 1/2% ＞SMTS 71 ksi

    Alloy Steel ＞13 mm(1/2") THK,


    4 225
    1/2%＜ Cr ≤ 2% ＞SMTS 71 ksi

    Alloy Steel ＞13 mm(1/2") THK, 5A,5B,


    241
    2-1/4% ≤ Cr ≤ 10% ＞3% Cr or C＞0.15% 5C
    High Alloy Steel ＞32 mm(1-1/4")
    (Martensite), All 6 241 THK
    A240 Gr.429 (Exceed 1-1/4")
    ＞32 mm (1-1/4")
    High Alloy Steel
    None 7,8 - ☞ Min. Preheating THK for CS
    (Ferritic, Austenitic)
    93℃ for CS (Exceed 1-1/4")
    32 mm(1-1/4") ~
    Nickel Alloy Steels ＞20 mm(3/4") THK 9A,9B - 38 mm(1-1/2")
    may be exempted

    Cr-Cu / Duplex SS / 27Cr Steel All 10/10H/10I -

    11A SG 1/
    8Ni, 9Ni / 5Ni Steel ＞51 mm(2") THK -
    11A SG 2

    Alloy Steel 9Cr-1Mo-V All 15E _

    Zr R60705 All 62 _

    # Note : 1. Fabrication, Assembly, and Erection에 적용

    2. 원자재인 경우(Pipe, Fitting, Flange등)에는 orginal code and standard에 따라서 열처리 (즉, ASTM, API 등)

    3. NACE MR 0175 material인 경우에는 orginal code and standard에 추가하여 상기 사항 적용

    4. SMTS means Specified Min. Tensile Strength.

    C:PWHT req as per Code(PWHT) 1 of 1 Printed Date : 2012-12-10

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