P91 Concerns

April 1st 2013

Creep Rupture? Tight Nickel levels? ( ASTM A335 & ASME SA335 )

Creep Rupture, tight Nickel levels, Nitrogen to Aluminum Ratio, no Delta Ferrite requirements, Brinell Hardness, Fatigue Cracking from Thermal Cycling are all issues affecting P91 and/or P22 material that are on the mind of power professionals around the world.

U. S. Metals has now added, to our globally recognized Seamless ASME SA335/ASTM A335 P91 inventory, material that will meet the requirements of the EPRI "Guidelines and Specifications for High-Reliability Fossil Power Plants". This EPRI document is a "Best Practice Guideline for Manufacturing and Construction of Grade 91 Components".



  • Trade Name
    1 1/4 Chrome
    2 1/4 Chrome
    5 Chrome
    9 Chrome
    91
    92
    Chrome Alloy Seamless Pipe
    A335
    A335
    A335
    A335
    A335
    A335
    Grade
    P11
    P22
    P5
    P9
    P91
    P92
    UNS #
    K11597
    K21590
    K41545
    S50400
    K91560
    K92460
     
    Chrome Alloy Welded Pipe
    A691
    A691
    A691
    A691
    A691
    ----
    Grade
    1 1/4CR
    2 1/4CR
    5CR
    9CR
    91
    ----
     
    Chrome Alloy Heater Tubes
    A213
    A213
    A213
    A213
    A213
    A213
    Grade
    T11
    T22
    T5
    T9
    T91
    T92
    UNS #
    K11597
    K21590
    K41545
    K90941
    K90901
    K92460
     
    Chrome Alloy Buttweld Fittings
    A234
    A234
    A234
    A234
    A234
    ----
    Grade
    WP11 / WP11W
    WP22 / WP22W
    WP5 / WP5W
    WP9 / WP9W
    WP91 / WP91W
    ----
     
    Chrome Alloy Flanges
    A182
    A182
    A182
    A182
    A182
    A182
    Grade
    F11
    F22
    F5
    F9
    F91
    F92
    Class 1 / UNS #
    K11597
    K21590
    K41545
    K90941
    K90901
    K92460
    Class 2 / UNS #
    K11572
    ----
    ----
    ----
    ----
    ----
    Class 3 / UNS #
    K11572
    K21590
    ----
    ----
    ----
    ----
     
    Chrome Alloy Forged Fittings
    A182
    A182
    A182
    A182
    A182
    A182
    Ident Symbol
    F11
    F22
    F5
    F9
    F91
    F92
    Class 1 / UNS #
    K11597
    K21590
    K41545
    K90941
    K90901
    K92460
    Class 2 / UNS #
    K11572
    ----
    ----
    ----
    ----
    ----
    Class 3 / UNS #
    K11572
    K21590
    ----
    ----
    ----
    ----
     
    Alloy Forged Valves
    A182
    A182
    A182
    A182
    A182
    A182
    Ident Symbol
    F11
    F22
    F5
    F9
    F91
    F92
    Class 1 / UNS #
    K11597
    K21590
    K41545
    K90941
    K90901
    K92460
    Class 2 / UNS #
    K11572
    ----
    ----
    ----
    ----
    ----
    Class 3 / UNS #
    K11572
    K21590
    ----
    ----
    ----
    ----
     
    Cast Alloy Steel Valves
    A217
    A217
    A217
    A217
    A217
    ----
    Grade
    WC6
    WC9
    C5
    C12
    C12A
    ----
    UNS #
    J12072
    J21890
    J42045
    J82090
    J84090
    ----
     
    Chrome Alloy Plate
    A387
    A387
    A387
    A387
    A387
    A387
    Grade
    11
    22
    5
    9
    91
    ----
    Class 1 / UNS #
    K11789
    K21590
    S50200
    K90941
    ----
    ----
    Class 2 / UNS #
    K11789
    K21590
    S50200
    K90941
    K90901
    ----
     
    Chrome Alloy Bar
    A182
    A182
    A182
    A182
    A182
    A182
    Grade
    F11
    F22
    F5
    F9
    F91
    ----
    UNS #
    ----
    ----
    ----
    ----
    ----
    ----
Information provided in this page is in accordance with the 2013 Edition of the ANNUAL BOOK OF ASTM STANDARDS
Refer to ASME B & PV Section II for non-identical A/SA requirements