+61 478727799

+61 434518549

Product List

Contact Us

  • North Steel (Sydney) Group Co., Ltd
    • +61 478727799info@north-steel.com
  • Room 604, No. 2, Beichen Building, Beichen District, Tianjin, China.
    • +61 478727799  +61 434518549
    Head Office: Room 604, No. 2, Beichen Building, Beichen District, Tianjin, China.
    Australian Office: 72/208 Parramatta Rd, Homebush, NSW 2140, Australia.
    • ASTM A335 seamless alloy steel pipe
    • ASTM A335 seamless alloy steel pipe
    • Alloy steel pipe
    • ASTM A335 SEAMLESS ALLOY STEEL PIPE
    1 (35)
    X
    1 (35)

    ASTM A335 SEAMLESS PIPE

    Categories:

    Contact Now

    ASTM A335 ALLOY STEEL SEAMLESS PIPE

    ASTM A335 is often called as chrome moly pipe because of the chemical contain of Molybdenum (Mo) and Chromium (Cr). Molybdenum increases the strength of steel and Chromium (or chrome) is the essential constituent of stainless steel. The composition chrome moly alloy steel pipe make it ideal for use in power plants, refineries, petro chemical plants, and oil field services where fluids and gases are transported at extremely high temperatures and pressures.  
    • Strong resistance to rupturing at high temperatures and high pressures
    • May be used for Hydrogen Sulfide Corrosion Services
    • Resistant to cracking from hydrogen attack and embrittlement
    • Resistant to hot sulfide corrosion cracking
    • Can be used for NACE Applications where sour environments are under high temp and pressure
    • Can be used in NACE-MRO 175 Sour Service
    • Ideal for creep rupture applications
    • Can handle high temperatures with very low elasticity

    CHEMICAL COMPOSITION OF ASTM A335 ALLOY STEEL SEAMLESS PIPE

    The types of alloy steel covered by the ASTM A335 – ASME SA335 specification are designed with a “P” prefix, from P5 to P92. Grades P11/P22 and P91/92 are typically found in power stations, whereas grade P5 and P9 are more common for application in the petrochemical industry. Grades P9, P91 are, in the list, the more expensive (a P91 seamless pipe may cost approx 5€ per kg.).  
    ASTM A335 Low-Alloy Steel (Grades) UNS equivalent C≤ Mn P≤ S≤ Si≤ Cr Mo
    P1 K11522 0.10~0.20 0.30~0.80 0.025 0.025 0.10~0.50 – 0.44~0.65
    P2 K11547 0.10~0.20 0.30~0.61 0.025 0.025 0.10~0.30 0.50~0.81 0.44~0.65
    P5 K41545 0.15 0.30~0.60 0.025 0.025 0.5 4.00~6.00 0.44~0.65
    P5b K51545 0.15 0.30~0.60 0.025 0.025 1.00~2.00 4.00~6.00 0.44~0.65
    P5c K41245 0.12 0.30~0.60 0.025 0.025 0.5 4.00~6.00 0.44~0.65
    P9 S50400 0.15 0.30~0.60 0.025 0.025 0.50~1.00 8.00~10.00 0.44~0.65
    P11 K11597 0.05~0.15 0.30~0.61 0.025 0.025 0.50~1.00 1.00~1.50 0.44~0.65
    P12 K11562 0.05~0.15 0.30~0.60 0.025 0.025 0.5 0.80~1.25 0.44~0.65
    P15 K11578 0.05~0.15 0.30~0.60 0.025 0.025 1.15~1.65 – 0.44~0.65
    P21 K31545 0.05~0.15 0.30~0.60 0.025 0.025 0.5 2.65~3.35 0.80~1.60
    P22 K21590 0.05~0.15 0.30~0.60 0.025 0.025 0.5 1.90~2.60 0.87~1.13
    P91 K91560 0.08~0.12 0.30~0.60 0.02 0.01 0.20~0.50 8.00~9.50 0.85~1.05
    P92 K92460 0.07~0.13 0.30~0.60 0.02 0.01 0.5 8.50~9.50 0.30~0.60
     

    MECHANICAL PROPERTIES OF ASTM A335 ALLOY STEEL SEAMLESS PIPE

    Hardness
    A335 Low-Alloy Pipe UNS Number Yield Strength ksi Tensile Strength ksi Elongation % Rockwell Brinell
    P1 K11522 30 55 30 – –
    P2 K11547 30 55 30 – –
    P5 K41545 40 70 30 – 207 max
    P9 S50400 30 60 30 – –
    P11 K11597 30 60 20 – –
    P12 K11562 32 60 30 – 174 max
    P22 K21590 30 60 30 – –
    P91 K91560 60 85 20 – –

    HEAT TREATMENT

    Alloy Steel pipe are heat treated to achieve mechanical properties as per the desired alloying element. Below are some of the types of heat treatment.
    • Normalize Quench and Tempering
    • Quench and Tempering
    • Normalizing & Hardening

    TESTING REQUIREMENTS

    • Transverse/longitudinal: tension and flattening, hardness, bend tests- for material which has been heat-treated in batch furnaces, these tests shall be made on the 5% of the pipes from each heat lot number. For smaller lots, one pipe at a minimum has to be tested
    • ASTM A335 Gr. P91 shall have a hardness of 250 HB / 265 HV (25 HRC)
    • Hydro testing: shall be applied to every length of pipe
    • The non-destructive electric test is optional
     

    TOLERANCES

     

    DIAMETER

    A335 Pipe Over Under
    NPS [DN] in. mm in. mm
    1/8 to 1 1/2 / DN 6 to 40 1/64 (0.015) 0.4 1/64 (0.015) 0.4
    Over 1 1/2 to 4 / DN 40 to 100 1/32 (0.031) 0.79 1/32 (0.031) 0.79
    Over 4 to 8 / DN 100 to 200 1/16 (0.062) 1.59 1/32 (0.031) 0.79
    Over 8 to 12 / DN 200 to 300 3/32 (0.093) 2.38 1/32 (0.031) 0.79
    Over 12 / > DN 300 +/- 1% of the specified outside diameter
     

    WALL THICKNESS

    The tolerances in WT, in %, from specified are:
    • 1/8 to 2 1/2 [6 to 65] incl., all t/D ratios: over 20%, under 12.5%
    • Above 2 1/2 [65], t/D < or = 5%: over 22.5%, under 12.5%
    • Above 2 1/2 [65], t/D > 5%: over 15%, under 12.5%
    t = Specified Wall Thickness; D = Specified Outside Diameter)

    Request Inquery

    News

    PRODUCTS

    Request a Quote

    Contact Us

  • North Steel (Sydney) Group Co., Ltd
    • +61 478727799info@north-steel.com
  • Room 604, No. 2, Beichen Building, Beichen District, Tianjin, China.
    • +61 478727799  +61 434518549

    Head Office

    Room 604, No. 2 Beichen Building, Beichen District, Tianjin, China.

    Australian Office

    72/208 Parramatta Rd, Homebush, NSW 2140, Australia.

    Copyright © 2025 North Steel (Sydney) Group Co., Ltd.  All Rights Reserved.

    Contact Us

    Request Inquery