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  • ASTM A249 TP321 Welded Boiler Tubes
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  • ASTM A249 TP321 Welded Boiler Tubes

    ASTM A249 TP321 Welded Austenitic Steel Boiler, Superheater, Heat-Exchanger, and Condenser Tubes
     
     
     
     
    Standard Specification for
    Welded Austenitic Steel Boiler, Superheater, Heat-Exchanger, and Condenser Tubes
     
     
     
    ASTM A249 TP321 Welded Boiler Tubes covers nominal-wall-thickness welded tubes and heavily cold worked welded tubes made from the austenitic steels, ASTM A249 TP321 Welded Austenitic Steel  Tubes intended for such use as boiler, superheater, heat exchanger, or condenser tubes.
     
     
     
    ASTM A249 TP321 Welded Boiler Tubes sizes and thicknesses usually furnished to this specification are 1 ⁄ 8 in. [3.2 mm] in inside diameter to 12 in. [304.8 mm] in outside diameter and 0.015 to 0.320 in. [0.4 to 8.1 mm], inclusive, in wall thickness. 
     
     
     
    ASTM A249 TP321 Welded Boiler Tubes Quick Details
    Company Name: Beite steel pipe
    Country/Region: China
    Product Name:ASTM A249 TP321 Welded Boiler Tubes
    Manufacture:welded process,
    Outside Diameter:12.7mm——127mm
    Wall thickness:0.9mm——12.7mm
    Length:6000mm、12000m or specified length as require
     
     
    Port of Shipment:Tianjin,China
    Payment:L/C or T/T
    Delivery: 7-15 days after payment
    Package: Bundles (hexagonal),Wooden Boxes,Crates (steel/wooden)
     
     
     
     
    Manufacture
    The welded (WLD) tubes are made from flat-rolled steel by an automatic welding process
    Subsequent to welding and prior to final heat treatment, the tubes shall be cold worked either in both weld and base metal or in weld metal only. 
     
    Heavily cold worked (HCW) tubes are made by applying cold working 
     
     

     
    Heat Treatment of ASTM A249 TP321

    Grade  UNS Number  Solutioning Temperature, min or range  Quenching Method
    TP321 S32100  1900 °F [1040 °C] C Quenched in water or rapidly cooled by other methods.
     
    A solution annealing temperature above 1950 °F [1065°C] may impair the resistance to intergranular corrosion after subsequent exposure to sensitizing conditions inTP321. 
     


     
    Chemical Composition of ASTM A249 TP321
     
    Grade
    UNS
    Designation
    Composition, %  
    Carbon Manganese Phosphorous Sulfur Silicon Chromium Nickel  Nitrogen  Other
    TP321  S32100 0.08 2.00 0.045 0.030 1.00 17.0-19.0 9.0–12.0 0.10
    Ti 5(C+N)-
    0.70
     



    Mechanical Properties of ASTM A249 TP321
     
    Grade
    UNS
    Designation
    Tensile Strength,
    min, ksi [MPa]
    Yield Strength,
    min, ksi [MPa]
    Elongation in 2 in. or
    50 mm,min, %
    Rockwell Hardness
    Number,max
    TP321  S32100 75 [515]  30 [205]  35 B90
     
    Mechanical property requirements do not apply to tubing smaller than 1 ⁄ 8 in. [3.2 mm] in inside diameter or 0.015 in. [0.4 mm] in thickness.
     

     
     
    Mechanical Tests and Grain Size Determinations 
     
    Grain Size
    Tension Test—One tension test be made on tubes.
    Flattening Test—One flattening test shall be made on specimens from each end of one finished tube
    Flange Test—One flange test shall be made on specimens from each end of one finished tube
    Reverse-Bend Test—One reverse-bend test shall be made on a specimen from each 1500 ft [450 m] of finished tubing.
    Hardness Test—Brinell or Rockwell hardness tests shall be made on specimens from two tubes from each lot .
    Hydrostatic or Nondestructive Electric Test—Each tube shall be subjected to either the hydrostatic or the nondestructive electric test. 
    Heavily cold worked tubes (HCW) are capable of passing the weld decay test listed 
     
     
     
     
     
    Permissible Variations in Dimensions
     

    Standard 

    Allowable Outside Diameter Variation in mm Allowable Wall Thickness Variation Exact Length Tolerance in mm
    Nominal Diameter Over Under %Over %Under Over Under

    ASTM-A249

    Under 25.4 .1016 .1016 +10 -10 3.175 0
    25.4-38.1 incl .1524 .1524 +10 -10 3.175 0
    38.1-50.8 Excl .2032 .2032 +10 -10 3.175 0
    50.0-63.5 excl .254 .254 +10 -10 4.762 0
    63.5-76.2 excl .3848 .3848 +10 -10 4.762 0
    76.2-101.6 incl .381 .381 +10 -10 4.762 0
          Minimum Wall tubes +18% 0 available On request    

     
     
     
    Surface Condition
    The tubes, after final heat treatment, shall be chemically descaled or pickled free of scale. When bright annealing is used, pickling or chemical descaling is not necessary.
     
     
     
     
     
    Ordering Information
    1 Quantity (feet, metres, or number of lengths),
    2 Name of material welded tubes (WLD) or heavily cold worked tubes (HCW),
    3 Grade (TP321),
    4 Size (outside diameter and nominal wall thickness),
    5 Length (specific or random),
    6 Test report required (see Certification Section of Specification A 1016/A 1016M),
    7 Specification designation, and
    8 Special requirements and any supplementary requirements selected.
     

     
     
     
     

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