ASTM A213 / A213M, also adopted by ASME as SA213, is the internationally recognized standard for seamless alloy-steel boiler, superheater, and heat-exchanger tubes. Among the many grades covered in this specification, T11 is one of the most widely used due to its excellent strength, corrosion resistance, and ability to perform under high-temperature and high-pressure conditions.
These tubes are essential in industries such as power generation, petrochemical processing, and refineries, where they serve as vital components in boilers, superheaters, and heat exchangers.
Standard and Scope
The ASTM A213 T11 seamless alloy tube must be produced by the seamless process, which ensures uniformity, structural integrity, and superior mechanical performance. Depending on requirements, the tubes may be supplied as hot-finished or cold-finished.
The ASTM A213 specification covers a wide range of minimum-wall-thickness alloy-steel tubes, particularly for use in boilers and superheaters, where reliability under elevated temperatures is critical.
Referenced standards for general requirements include:
ASTM A1016 / A1016M – Specification for General Requirements for Ferritic Alloy Steel, Austenitic Alloy Steel, and Stainless Steel Tubes.
Sizes and Dimensions of ASTM A213 T11 Seamless Alloy Tubes
|
Parameter
|
Range / Specification
|
Notes
|
|
Outside Diameter (OD)
|
19.05 mm – 114.3 mm (¾ in. – 4½ in.)
|
Standard size range
|
|
Wall Thickness
|
1.65 mm – 12.7 mm (0.065 in. – 0.5 in.)
|
Standard tolerance
|
|
Inside Diameter
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3.2 mm – 127 mm (1/8 in. – 5 in.)
|
As per ASTM A213 specification
|
|
Length
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Single random, double random, or cut-to-length
|
Based on customer requirement
|
|
Shape
|
Round
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Standard delivery form
|
|
Custom Options
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Special OD / thickness available if meeting ASTM spec
|
Customized production possible
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Chemical Composition of ASTM A213 T11
|
Element
|
Content (%)
|
|
Carbon (C)
|
0.05 – 0.15
|
|
Manganese (Mn)
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0.30 – 0.60
|
|
Phosphorus (P)
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≤ 0.025
|
|
Sulfur (S)
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≤ 0.025
|
|
Silicon (Si)
|
0.50 – 1.00
|
|
Chromium (Cr)
|
1.00 – 1.50
|
|
Molybdenum (Mo)
|
0.44 – 0.65
|
ASTM A213 T11 Seamless Alloy Tubes are a vital material choice for high-temperature and high-pressure applications. Manufactured to stringent ASTM and ASME standards, these Cr-Mo alloy steel tubes deliver excellent strength, resistance to oxidation, and long service life in boilers, superheaters, and heat exchangers. Their wide dimensional range, strict chemical composition, and mechanical property requirements make them one of the most trusted materials in power generation, refineries, and petrochemical industries worldwide.
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