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  • ASTM A250 Grade T11 Alloy Boiler Tubes
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    ASTM A250 Grade T11 Alloy Steel  Boiler Tubes

    Standard Specification for Electric-Resistance-Welded Ferritic Alloy-Steel Boiler and Superheater Tubes
    ASTM A250 Grade T11 Steel Tube covers minimum-wall-thickness,electric -resistance-welded, carbon-molybdenum and chromium-molybdenum alloy-steel, boiler and superheater tubes.
    ASTM A250 Grade T11 Alloy-Steel Boiler Tubes sizes and thicknesses usually furnished to this specification are 1 ⁄ 2 to 5 in. [12.7 to 127 mm] in outside diameter and 0.035 to 0.320 in. [0.9 to 8.1 mm]

    ASTM A250 Grade T11 Alloy-Steel Boiler Tubes Quick Details
    Company Name: Beite steel pipe
    Country/Region: China
    Product Name:ASTM A250 Grade T11 Alloy-Steel Boiler Tubes
    Manufacture:electric-resistance welding
    Outside Diameter:12.7mm——127mm
    Wall thickness:0.9mm——8.1mm
    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)
    Materials and Manufacture
    The tubes are made by electric-resistance welding.

    Heat Treatment
    After welding, or when cold finished, after the final cold-drawing pass, all tubes shall be heat treated and, furnished in the full annealed, isothermal annealed, normalized, or normalized and tempered condition at the option of the manufacturer. If furnished in the normalized and tempered condition, the minimum tempering temperature shall be 1200 °F [650 °C]
    Chemical Composition
    Element Composition, %      
    Grade T11
    Carbon 0.05–0.15
    Manganese 0.30–0.60
    Phosphorus,max 0.025
    Sulfur, max 0.020
    Silicon 0.50–1.00
    Molybdenum 0.44–0.65
    Chromium 1.00–1.50

    Mechanical Properties

    Grade T11
    Tensile strength, min, ksi [MPa 60 [415]
    Yield strength, min, ksi [MPa] 30 [205]
    Elongation in 2 in. or 50 mm, min, % 30
    For longitudinal strip tests a deduction shall be made for each
    1 ⁄ 32 -in. [0.8-mm] decrease in wall thickness below 5 ⁄ 1 6 in.[8 mm] from the basic minimum elongation of the following
    percentage points
    1.50 A
    Brinell Hardness Number (Tubes 0.200 in. [5.1 mm] and over in wall thickness), HBW 163
    Rockwell Hardness Number (Tubes less than 0.200 in. [5.1 mm] in wall thickness), HRB 85
    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
    Tension Test—One tension test shall be made on a specimen for lots of not more than 50 tubes. Tension tests shall be made on specimens from two tubes for lots of more than 50 tubes
    Flattening Test—One flattening test shall be made on specimens from each end ofone finished tube
    Flange Test—One flange test shall be made on specimens from each end of one finished tube
    Reverse Flattening Test—One reverse flattening test shall be made on a specimen from each 1500 ft [450 m] of finished tubing.
    Hardness Test—Brinell and Rockwell hardness tests shall be made on specimens from two tubes from each lot
    Hydrostatic or Nondestructive Electric Tests—Each tube shall be subjected to either the hydrostatic or the nondestructive electric test. 
    Product Marking
    The marking shall include the words “Electric Resistance-Welded Steel.”
    Ordering Information
    Orders for material include the following, as required, to describe the desired material adequately:
    1.1 Quantity (feet, metres, or number of lengths),
    1.2 Name of material (electric-resistance-welded tubes),
    1.3 Grade (Grade T11),
    1.4 Size (outside diameter or minimum wall thickness),
    1.5 Length (specific or random),
    1.6 Test report required 
    1.7 Specification designation, and
    1.8 Special requirements and any supplementary requirements selected.


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