ASTM A210 Specification for Seamless Carbon Boiler Tubes

The ASTM A210 standard specifies seamless carbon steel tubes and superheater tubes designed for use in boiler systems. These are medium carbon steel products that are manufactured through a seamless process, allowing for both hot and cold working of the final product. The tubes come in various types, including safe-end tubes, minimum wall thickness arch tubes, and support tubes. Surface conditions can be tailored to meet specific customer requirements.

Common delivery conditions include annealing, normalizing, or normalization followed by tempering. Surface treatments available are oil immersion, varnish coating, passivation, phosphating, and shot blasting. These tubes are ideal for high, medium, and low-pressure boiler applications as well as other pressure-related uses.

Chemical Composition:

Grade C (Max) Mn (Max) Si (Min) P (Max) S (Max)
A1 0.27 0.93 0.10 0.035 0.035
C 0.35 0.29–1.06 0.10 0.035 0.035

Mechanical Properties:

Grade Tensile Strength (MPa) Yield Strength (MPa) Elongation (%)
A1 ≥ 415 ≥ 255 ≥ 30
C ≥ 485 ≥ 275 ≥ 30

Outside Diameter and Tolerance:

Hot Rolled Outside Diameter, mm Tolerance, mm
OD ≤ 101.6 +0.4 / -0.8
101.6 < OD ≤ 127 +0.4 / -1.2
   
Cold Drawn Outside Diameter, mm Tolerance, mm
OD < 25.4 ±0.10
25.4 ≤ OD ≤ 38.1 ±0.15
38.1 < OD < 50.8 ±0.20
50.8 ≤ OD < 63.5 ±0.25
63.5 ≤ OD < 76.2 ±0.30
76.2 ≤ OD ≤ 101.6 ±0.38
101.6 < OD ≤ 127 +0.38 / -0.64
   

Wall Thickness and Tolerance:

Hot Rolled Outside Diameter, mm Tolerance, %
OD ≤ 101.6, WT ≤ 2.4 +40 / -0
OD ≤ 101.6, 2.4 < WT ≤ 3.8 +35 / -0
OD ≤ 101.6, 3.8 < WT ≤ 4.6 +33 / -0
OD ≤ 101.6, WT > 4.6 +28 / -0
OD > 101.6, 2.4 < WT ≤ 3.8 +35 / -0
OD > 101.6, 3.8 < WT ≤ 4.6 +33 / -0
OD > 101.6, WT > 4.6 +28 / -0
Cold Drawn Outside Diameter, mm Tolerance, %
OD ≤ 38.1 +20 / -0
OD > 38.1 +22 / -0

These tubes are widely used in industrial boilers and heat exchangers due to their excellent mechanical properties and durability. They are also suitable for applications where high strength and resistance to thermal stress are required. Compliance with ASTM A210 ensures that the tubes meet strict quality and performance standards, making them a reliable choice for critical engineering applications.

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