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ASTM A213 TP321 Stainless Steel Seamless Tube For Heat Exchange

Categories Stainless Steel Seamless Tube
Brand Name: YUHONG
Model Number: A213 TP321 , A312 TP321, A269 TP321
Certification: ABS, GL, DNV, NK, PED, AD2000, GOST9941-81, CCS, ISO 9001-2008
Place of Origin: CHINA
Payment Terms: L/C, T/T
Delivery Time: 7DAYS
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Yuhong Group Co.,Ltd
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    ASTM A213 TP321 Stainless Steel Seamless Tube For Heat Exchange

    ASTM A213 TP321 19.05 X 2.11 X 6000MM , Stainless Steel Seamless Tube for heat exchange application

    Stainless Steel 321 is a basic austenitic 18/8 steel (Grade 304) stabilised by Titanium (321) addition. SS 321 is used because they are not sensitive to intergranular corrosion after heating within the carbide precipitation range of 425-850°C. SS 321 is the grade of choice for applications in the temperature range of up to about 900°C, combining high strength, resistance to scaling and phase stability with resistance to subsequent aqueous corrosion. SS 321H is a modification of SS 321 with a higher carbon content, to provide improved high temperature strength.


    Stainless Steel SS 321 / 321H
    AISI321 / 321H
    UNSS32100 / S32109
    Werkstoff Nr.1.4541 / 1.4878

    Mechanical & Physical Properties

    Density8.0 g/cm3
    Melting Point1454 °C (2650 °F)
    Tensile StrengthPsi – 75000 , MPa – 515
    Yield Strength (0.2%Offset)Psi – 30000 , MPa – 205
    Elongation35 %

    Chemical Composition

    SS 321SS 321H
    Ni9 – 129 – 12
    Cr17 – 1917 – 19
    C0.08 max0.04 – 0.10
    N0.10 max
    Mn2 max2 max
    Si0.75 max0.75 max
    S0.03 max0.03 max
    P0.045 max0.045 max
    Ti5xC min
    0.60% max
    4xC min
    0.60% max

    Alloys 321 (S32100) and 347 (S34700) are stabilized stainless steels which offer as their main advantage an excellent resistance to intergranular corrosion following exposure to temperatures in the chromium carbide precipitation range from 800 to 15000F (427 to 8160C). Alloy 321 is stabilized against chromium carbide formation by the addition of titanium. Alloy 347 is stabilized by the addition of columbium and tantalum.

    While Alloys 321 and 347 continue to be employed for prolonged service in the 800 to 15000F (427 to 8160C) temperature range, Alloy 304L has supplanted these stabilized grades for applications involving only welding or short time heating.

    Alloys 321 and 347 stainless steels are also advantageous for high temperature service because of their good mechanical properties. Alloys 321 and 347 stainless steels offer higher creep and stress rupture properties than Alloy 304 and, particularly, Alloy 304L, which might also be considered for exposures where sensitization and intergranular corrosion are concerns. This results in higher elevated temperature allowable stresses for these stabilized alloys for ASME Boiler and Pressure Vessel Code applications. The 321 and 347 alloys have maximum use temperatures of 15000F (8160C) for code applications like Alloy 304, whereas Alloy 304L is limited to 8000F (4260C).

    High carbon versions of both alloys are available. These grades have UNS designations S32109 and S34709.

    Resistance to Corrosion of 321 Stainless Steel Pipes and Tubes

    General Corrosion
    Alloys 321 and 347 offer similar resistance to general, overall corrosion as the unstabilized chromium nickels Alloy 304. Heating for long periods of time in the chromium carbide precipitation range may affect the general resistance of Alloys 321 and 347 in severe corrosive media.

    In most environments, both alloys will show similar corrosion resistance; however, Alloy 321 in the annealed condition is somewhat less resistant to general corrosion in strongly oxidizing environments than annealed Alloy 347. For this reason, Alloy 347 is preferable for aqueous and other low temperature environments. Exposure in the 8000F to 15000F (4270C to 8160C) temperature range lowers the overall corrosion resistance of Alloy 321 to a much greater extent than Alloy 347. Alloy 347 is used primarily in high temperature applications where high resistance to sensitization is essential, thereby preventing intergranular corrosion at lower temperatures.

    Physical Properties of 321 Stainless Steel Pipes and Tubes

    The physical properties of Types 321 and 347 are quite similar and, for all practical purposes, may be considered to be the same. The values given in the table may be used to apply to both steels.
    When properly annealed, the Alloys 321 and 347 stainless steels consist principally of austenite and carbides of titanium or columbium. Small amounts of ferrite may or may not be present in the microstructure. Small amounts of sigma phase may form during long time exposure in the 10000F to 15000F (5930C to 8160C) temperature range.
    The stabilized Alloys 321 and 347 stainless steels are not hardenable by heat treatment.
    The overall heat transfer coefficient of metals is determined by factors in addition to thermal conductivity of the metal. In most cases, film coefficients, scaling, and surface conditions are such that not more than 10 to 15% more surface area is required for stainless steels than for other metals having higher thermal conductivity. The ability of stainless steels to maintain clean surfaces often allows better heat transfer than other metals having higher thermal conductivity.

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