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ASTM A312 Pipe Manufacturer & Supplier in China

    ASTM A312 Pipe

    ASTM A312 pipe is the standard international specification covering seamless,straight-seam welded,and heavily cold-worked austenitic stainless steel pipes engineered for high-temperature and general corrosive environments.
    • TP304/304L
    • TP316/316L
    • TP321/321H
    • TP347/347H
    • TP317L / UNS S31703
    • 904L / UNS N08904
    • 254 SMO / UNS S31254
    • TP310S / UNS S31008
    • TP316H / UNS S31609
    • TP309S / UNS S30908
    ASTM A312 Pipe Factory in China
    Generally,we supply seamless stainless steel pipes that comply with the ASTM A312 standard in sizes ranging from 1/2″ to 24″,with wall thicknesses of SCH10S, SCH20, SCH40S/STD, SCH80S/XS, SCH30, SCH60, SCH80, SCH100, SCH120, SCH160, and XXS.
    Welded stainless steel pipes are available in sizes ranging from 1/2″ to 104″,with wall thicknesses from SCH5S to SCH80S/XS.
    If you do not find what you need here,we also offer highly customized services.Please feel free to contact us for a personalized quote.

    Have a requirement?

    Kaysuns is a professional supplier of 904L stainless steel pipes.Please feel free to contact me if you have any requirements.

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    Chemical Composition of ASTM A312 Pipe

    ASTM A312 TP304 and TP304L are austenitic stainless steels.The difference between the two lies in the upper limit of carbon and nickel content.

    ElementCCrNiMnSiPSNFe
    TP304≤ 0.08%18.0% – 20.0%8.0% – 11.0%≤ 2.00%≤ 1.00%≤ 0.045%≤ 0.030%≤ 0.10%Balance
    TP304L≤ 0.035%18.0% – 20.0%8.0% – 13.0%≤ 2.00%≤ 1.00%≤ 0.045%≤ 0.030%≤ 0.10%Balance

    ASTM A312 TP316 and TP316L are molybdenum-containing austenitic stainless steels.Compared to 304 series stainless steels,they offer superior resistance to localized pitting and chloride corrosion.Kaysuns typically supplies these grades with dual certification.

    ElementCMoCrNiMnSiPSNFe
    TP316≤ 0.08%2.00% – 3.00%16.0% – 18.0%10.0% – 14.0%≤ 2.00%≤ 1.00%≤ 0.045%≤ 0.030%≤ 0.10%Balance
    TP316L≤ 0.035%2.00% – 3.00%16.0% – 18.0%10.0% – 15.0%≤ 2.00%≤ 1.00%≤ 0.045%≤ 0.030%≤ 0.10%Balance

    ASTM A312 TP321 and TP321H are titanium-stabilized austenitic stainless steel tubes.The main difference lies in their carbon (C) content and the corresponding proportion of titanium (Ti) stabilizer.

    ElementCTiCrNiMnSiPSNFe
    TP321≤ 0.08%5 × (C + N) to 0.7%17.0% – 19.0%9.0% – 12.0%≤ 2.00%≤ 1.00%≤ 0.045%≤ 0.030%≤ 0.10%Balance
    TP321H0.04% – 0.10%4 × C to 0.7%17.0% – 19.0%9.0% – 12.0%≤ 2.00%≤ 1.00%≤ 0.045%≤ 0.030%≤ 0.10%Balance

    Standard TP347 is suitable for general chemical processing at moderate temperatures,while the high-carbon TP347H offers significantly superior creep strength and stress rupture strength under extreme temperature conditions.

    ElementCCb / NbCrNiMnSiPSNFe
    TP347≤ 0.08%10 × C to 1.10%17.0% – 19.0%9.0% – 12.0%≤ 2.00%≤ 1.00%≤ 0.045%≤ 0.030%–Balance
    TP347H0.04% – 0.10%8 × C to 1.10%17.0% – 19.0%9.0% – 13.0%≤ 2.00%≤ 1.00%≤ 0.045%≤ 0.030%≤ 0.10%Balance

    ASTM A312 TP317L (UNS S31703) is a low-carbon,molybdenum-containing austenitic stainless steel pipe.It is an upgraded version of TP316L with higher alloy content and is specifically designed to withstand highly corrosive chemical media.

    ElementMoCrNiCMnSiPSNFe
    TP317L(S31703)3.00% – 4.00%18.0% – 20.0%11.0% – 15.0%≤ 0.030%≤ 2.00%≤ 1.00%≤ 0.045%≤ 0.030%≤ 0.10%Balance

    ASTM A312 904L (UNS N08904) was originally developed for use in extremely high-concentration sulfuric acid applications.Its unique chemical composition combines very high concentrations of nickel and chromium with specific additions of molybdenum and copper.

    ElementNiCrMoCuCMnSiPSFe
    904L(N08904)23.0% – 28.0%19.0% – 23.0%4.00% – 5.00%1.00% – 2.00%≤ 0.020%≤ 2.00%≤ 1.00%≤ 0.040%≤ 0.030%Balance

    ASTM A312 254 SMO (UNS S31254) is characterized by a significantly higher molybdenum content and the deliberate addition of nitrogen to enhance its mechanical strength and structural stability,thereby preventing alloy segregation.

    ElementMoCrNiNCuCMnSiPSFe
    254 SMO6.0% – 6.5%19.5% – 20.5%17.5% – 18.5%0.18% – 0.25%0.5% – 1.0%≤ 0.020%≤ 1.00%≤ 0.08%≤ 0.030%≤ 0.010%Balance

    According to the ASTM A312 standard, the chemical composition limits for TP310S are as follows:

    ElementCrNiCMnSiPSFe
    TP310S(S31008)24.00% – 26.00%19.00% – 22.00%≤ 0.08%≤ 2.00%≤ 1.50%≤ 0.045%≤ 0.030%Balance

    ASTM A312 TP316H (UNS S31609) is a high-carbon variant of molybdenum-containing austenitic stainless steel pipe.By maintaining carbon content within a specific,higher range,it offers exceptional resistance.

    ElementCMoCrNiMnSiPSFe
    TP316H(S31609)0.04% – 0.10%2.00% – 3.00%16.00% – 18.00%10.00% – 14.00%≤ 2.00%≤ 1.00%≤ 0.045%≤ 0.030%Balance

    TP309S (UNS S30908) is a high-chromium,high-nickel austenitic stainless steel pipe.According to the ASTM A312 standard,the chemical composition limits for TP309S are as follows:

    ElementCrNiCMnSiPSFe
    TP309S(S30908)22.00% – 24.00%12.00% – 15.00%≤ 0.08%≤ 2.00%≤ 1.00%≤ 0.045%≤ 0.030%Balance

    Mechanical Properties of ASTM A312 Pipe

    According to the ASTM A312 / ASME SA312 standards,the mechanical properties of stainless steel pipes are key indicators for determining whether they can withstand high internal pressure,external loads,and high-temperature creep.
    Under the ASTM A312 standard,all steel pipes must be in a solution-annealed condition prior to shipment,and their mechanical properties must meet the following minimum values and maximum hardness limits:
    GradeTensile StrengthYield StrengthElongationHardness
    TP304 / TP316≥ 515 MPa (75 ksi)≥ 205 MPa (30 ksi)≥ 35%≤ 192 HBW (90 HRB)
    TP304L / TP316L≥ 485 MPa (70 ksi)≥ 170 MPa (25 ksi)≥ 35%≤ 192 HBW (90 HRB)
    TP321 / TP347≥ 515 MPa (75 ksi)≥ 205 MPa (30 ksi)≥ 35%≤ 192 HBW (90 HRB)
    TP321H / TP347H≥ 515 MPa (75 ksi)≥ 205 MPa (30 ksi)≥ 35%≤ 192 HBW (90 HRB)
    TP316H≥ 515 MPa (75 ksi)≥ 205 MPa (30 ksi)≥ 35%≤ 192 HBW (90 HRB)
    TP317L≥ 515 MPa (75 ksi)≥ 205 MPa (30 ksi)≥ 35%≤ 192 HBW (90 HRB)
    TP309S / TP310S≥ 515 MPa (75 ksi)≥ 205 MPa (30 ksi)≥ 35%≤ 192 HBW (90 HRB)
    904L≥ 490 MPa (71 ksi)≥ 220 MPa (32 ksi)≥ 35%90 HRB / 70 HRB
    254 SMO≥ 650 MPa (94 ksi)≥ 300 MPa (44 ksi)≥ 35%≤ 250 HBW (100 HRB)

    ASTM A312 Pipe Dimensions and Tolerances

    In the international piping industry,the physical dimensions of stainless steel pipes are governed by ASME B36.19M and ASME B36.10M.The permissible dimensional deviations are strictly mandated by the ASTM A999/A999M general requirements specification,which covers ASTM A312.

    Dimensions For ASTM A312 Pipe

    NPSOD,mm5S WT,mm10S WT,mm40S WT,mm80S WT,mm
    1/8″0.405″
    10.3 mm    		–0.049″
    1.24 mm    		0.068″
    1.73 mm    		0.095″
    2.41 mm
    1/4″0.540″
    13.7 mm    		–0.065″
    1.65 mm    		0.088″
    2.24 mm    		0.119″
    3.02 mm
    3/8″0.675″
    17.1 mm    		–0.065″
    1.65 mm    		0.091″
    2.31 mm    		0.126″
    3.20 mm
    1/2″0.840″
    21.3 mm    		0.065″
    1.65 mm    		0.083″
    2.11 mm    		0.109″
    2.77 mm    		0.147″
    3.73 mm
    3/4″1.050″
    26.7 mm    		0.065″
    1.65 mm    		0.083″
    2.11 mm    		0.113″
    2.87 mm    		0.154″
    3.91 mm
    1″1.315″
    33.4 mm    		0.065″
    1.65 mm    		0.109″
    2.77 mm    		0.133″
    3.38 mm    		0.179″
    4.55 mm
    1-1/4″1.660″
    42.2 mm    		0.065″
    1.65 mm    		0.109″
    2.77 mm    		0.140″
    3.56 mm    		0.191″
    4.85 mm
    1-1/2″1.900″
    48.3 mm    		0.065″
    1.65 mm    		0.109″
    2.77 mm    		0.145″
    3.68 mm    		0.200″
    5.08 mm
    2″2.375″
    60.3 mm    		0.065″
    1.65 mm    		0.109″
    2.77 mm    		0.154″
    3.91 mm    		0.218″
    5.54 mm
    2-1/2″2.875″
    73.0 mm    		0.083″
    2.11 mm    		0.120″
    3.05 mm    		0.203″
    5.16 mm    		0.276″
    7.01 mm
    3″3.500″
    88.9 mm    		0.083″
    2.11 mm    		0.120″
    3.05 mm    		0.216″
    5.49 mm    		0.300″
    7.62 mm
    4″4.500″
    114.3 mm    		0.083″
    2.11 mm    		0.120″
    3.05 mm    		0.237″
    6.02 mm    		0.337″
    8.56 mm
    6″6.625″
    168.3 mm    		0.109″
    2.77 mm    		0.134″
    3.40 mm    		0.280″
    7.11 mm    		0.432″
    10.97 mm
    8″8.625″
    219.1 mm    		0.109″
    2.77 mm    		0.148″
    3.76 mm    		0.322″
    8.18 mm    		0.500″
    12.70 mm
    10″10.750″
    273.0 mm    		0.134″
    3.40 mm    		0.165″
    4.19 mm    		0.365″
    9.27 mm    		0.500″
    12.70 mm
    12″12.750″
    323.8 mm    		0.156″
    3.96 mm    		0.180″
    4.57 mm    		0.375″
    9.53 mm    		0.500″
    12.70 mm

    Outside Diameter Tolerance

    NPS RangeOver Tolerance (Plus)Under Tolerance (Minus)
    1/8″ to 1-1/2″ (NPS 1/8 to 1-1/2)+1/64 in. (+0.4 mm)-1/32 in. (-0.8 mm)
    Over 1-1/2″ to 4″ (NPS 1-1/2 to 4)+1/32 in. (+0.8 mm)-1/32 in. (-0.8 mm)
    Over 4″ to 8″ (NPS 4 to 8)+1/16 in. (+1.6 mm)-1/32 in. (-0.8 mm)
    Over 8″ to 18″ (NPS 8 to 18)+3/32 in. (+2.4 mm)-1/32 in. (-0.8 mm)
    Over 18″ to 26″ (NPS 18 to 26)+1/8 in. (+3.2 mm)-1/32 in. (-0.8 mm)

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