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    Chromium-Molybdenum Alloy Steel Pipes, Fittings and Flange

    What are alloy steels and low alloy steels?

    According to ASTM A 941 the definition terminology, alloy steels are steels(other than stainless steel) containing deliberate amounts of one or more of the following elements shown in below chart, 
    Alloying Element
    Mass Percent(%) Minimum
    Aluminum
    0.30 
    Boron
    0.0008 
    Chromium
    0.30 
    Cobalt
    0.30 
    Copper
    0.40 
    Lead
    0.40 
    Manganese
    1.65 
    Molybdenum
    0.08 
    Nickel
    0.30 
    Niobium
    0.06 
    Silicon
    0.60 
    Titanium
    0.05 
    Tungsten
    0.30 
    Vanadium
    0.10 
    Zirconium
    0.05 
    Any other element, except P, S, N and Carbon
    0.10 
    On the contrary, low alloy steels are alloy steels that contain less than the minimum percentages of alloying elements that define and alloy steel.

    Chromium-Molybdenum alloy steels for pipes, fittings and flanges

    The Cr-Mo alloy steels are most widely used alloy steels for piping components which are mainly applied to high pressure & high temperature services such as oil refinery pipeline, power plants, heat exchangers, furnace systems and pressure reactor vessels. 
    1) Seamless pipes: ASTM A 335, Grade P5, P9, P11, P12, P22, P91, P911
    2) Butt weld fittings: ASTM A 234, Grade WP5, WP9, WP11, WP12, WP22, WP91, WP911
    3) Flanges & Forgings: ASTM A 182, Grade F5, F9, F11, F12, F22, F91, F911

    1-1. Chemical composition of ASTM A 335, Gr. P5, P9, P11, P12, P22, P91, P911

    SPEC.
    CHEMICAL COMPOSITION(%)
    ASTM A335
    C
    Mn
    P
    S
    Si
    Cr
    Mo
    Others
    P5
    0.15
    0.30~0.60
    0.025
    0.025
    0.5
    4.00~6.00
    0.45~0.65
    -
    P9
    0.15
    0.30~0.60
    0.025
    0.025
    0.25~1.00
    8.00~10.00
    0.90~1.10
    -
    P11
    0.05~0.15
    0.30~0.60
    0.025
    0.025
    0.50~1.00
    1.00~1.50
    0.44~0.65
    -
    P12
    0.05~0.15
    0.30~0.61
    0.025
    0.025
    0.5
    0.80~1.25
    0.44~0.65
    -
    P22
    0.05~0.15
    0.30~0.60
    0.025
    0.025
    0.5
    1.90~2.60
    0.87~1.13
    -
    P91
    0.08~0.12
    0.30~0.60
    0.02
    0.010
    0.20~0.50
    8.00~9.50
    0.85~1.05
    *A
    P911
    0.09~0.13
    0.30~0.60
    0.02
    0.010
    0.10~0.50
    8.50~10.50
    0.90~1.10
    *B
    *All requirements are maximum unless otherwise specified
    *A refers to V(0.18~0.25), N(0.030~0.070), Ni(0.40 max), Al(0.04 max), Cb(0.060~0.10)
    *B refers to V(0.18~0.25), N(0.030~0.070), Ni(0.40 max), Al(0.04 max), Cb(0.060~0.10), W(0.90~1.10)
                        B(0.0003~0.006), W(0.90~1.10)

    1-2. Mechanical properties of ASTM A 234, Gr. WP5, WP9, WP11, WP12, WP22, WP91, WP911

    ASTM A335
    Tensile Strength
    (Min. Mpa)
    Yield Strength
    (Min. Mpa)
    Elongation L.
    (Min%)
    Elongation Tr.
    (Min%)
    P5
    415
    205
    20
    -
    P9
    415
    205
    20
    -
    P11
    415
    205
    20
    -
    P12
    415
    220
    20
    -
    P22
    415
    205
    20
    -
    P91
    585
    415
    30
    20
    P911
    620
    440
    30
    20

    2-1. Chemical composition of ASTM A 234, Gr. WP5, WP9, WP11, WP12, WP22, WP91, WP911

    SPEC.
    CHEMICAL COMPOSITION(%)
    ASTM A234
    C
    Mn
    P
    S
    Si
    Cr
    Mo
    Others
    WP5
    0.15
    0.30~0.60
    0.04
    0.03
    0.5
    4.00~6.00
    0.44~0.65
    -
    WP9
    0.15
    0.30~0.60
    0.03
    0.03
    1.00 
    8.00~10.00
    0.90~1.10
    -
    WP11
    0.05~0.15
    0.30~0.60
    0.03
    0.03
    0.50~1.00
    1.00~1.50
    0.44~0.65
    -
    WP12
    0.05~0.20
    0.30~0.80
    0.045
    0.045
    0.6
    0.80~1.25
    0.44~0.65
    -
    WP22
    0.05~0.15
    0.30~0.60
    0.04 
    0.04
    0.5
    1.90~2.60
    0.87~1.13
    -
    WP91
    0.08~0.12
    0.30~0.60
    0.02
    0.01
    0.20~0.50
    8.00~9.50
    0.85~1.05
    *A
    WP911
    0.09~0.13
    0.30~0.60
    0.02
    0.01
    0.10~0.50
    8.50~9.50
    0.90~1.10
    *B
    *All requirements are maximum unless otherwise specified
    *A refers to V(0.18~0.25), N(0.030~0.070), Ti(0.01 max), Al(0.02 max), Co(0.060~0.10), N(0.03~0.07)
    *B refers to V(0.18~0.25), N(0.040~0.090), Ni(0.40 max), Al(0.02 max), Ti(0.01 max), W(0.90~1.10)
               B(0.0003~0.006), Zi(0.01 max)

    2-2. Mechanical Properties of ASTM A 234, Gr. WP5, WP9, WP11, WP12, WP22, WP91, WP911

    ASTM A234
    Tensile Strength
    (Min. Mpa)
    Yield Strength
    (Min. Mpa)
    Elongation L.
    (Min%)
    Elongation Tr.
    (Min%)
    WP5
    415~585
    205
    20
    -
    WP9
    415~585
    205
    20
    -
    WP11
    415~585
    205
    20
    -
    WP12
    415~585
    220
    20
    -
    WP22
    415~585
    205
    20
    -
    WP91
    585~760
    415
    30
    20
    WP911
    620~840
    440
    30
    20

    3-1. Chemical composition of ASTM A 182, Gr. F5, F9, F11, F12, F22, F91, F911

    SPEC.
    CHEMICAL COMPOSITION(%)
    ASTM A182
    C
    Mn
    P
    S
    Si
    Ni
    Cr
    Mo
    Others
    F5
    0.15
    0.30~0.60
    0.030 
    0.030 
    0.50 
    0.50 
    4.00~6.00
    0.44~0.65
    -
    F9
    0.15
    0.30~0.60
    0.030 
    0.030 
    0.50~1.00
     
    8.00~10.00
    0.90~1.10
    -
    F11
    0.05~0.15
    0.30~0.60
    0.030 
    0.030 
    0.50~1.00
     
    1.00~1.50
    0.44~0.65
    -
    F12
    0.05~0.15
    0.30~0.60
    0.045 
    0.045 
    0.50 
     
    0.80~1.25
    0.44~0.65
    -
    F22
    0.05~0.15
    0.30~0.60
    0.040 
    0.040 
    0.50 
     
    2.00~2.50
    0.87~1.13
    -
    F91
    0.08~0.12
    0.30~0.60
    0.020 
    0.010 
    0.20~0.50
    0.40 
    8.00~9.50
    0.85~1.05
    *A
    F911
    0.09~0.13
    0.30~0.60
    0.020 
    0.010 
    0.10~0.50
    0.40 
    8.50~9.50
    0.90~1.10
    *B
    *All requirements are maximum unless otherwise specified
    *A refers to V(0.18~0.25), N(0.030~0.070),  Al(0.04 max)
    *B refers to V(0.18~0.25), N(0.040~0.090), Al(0.04 max), W(0.90~1.10),B(0.0003~0.006)

    3-2. Mechanical Properties of ASTM A 182, Gr. F5, F9, F11, F12, F22, F91, F911

    ASTM A234
    Tensile Strength
    (Min. Mpa)
    Yield Strength
    (Min. Mpa)
    Elongation
    (Min%)
    HB
    (Min.)
    F5
    485
    275
    20
    143-217
    F9
    585
    380
    20
    179-217
    F11
    415
    205
    20
    121-174
    F12
    415
    220
    20
    121-174
    F22
    415
    205
    20
    170
    F91
    585
    415
    20
    248
    F911
    620~840
    440
    19
    187-248

     

    Views: 11420  Author:METALS INDUSTRIAL  Date:2015/02/07