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ASME A209 T1a Boiler tube 5" size

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Product Introduction

ASTM/ASME A209/A209M Standard Specification for
Seamless Carbon-Molybdenum Alloy-Steel Boiler and Superheater Tubes

This specification covers several grades of minimum-wall-thickness, seamless, carbon-molybdenum alloy-steel,boiler and superheater tubes.
This specification covers tubes 1 ⁄ 2 to 5 in. [12.7 to 127mm] inclusive, in outside diameter and 0.035 to 0.500 in. [0.9 to 12.7 mm], inclusive, in minimum wall thickness.
An optional supplementary requirement is provided and,when desired, shall be so stated in the order.
The values stated in either inch-pound units or SI units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system must be used independently ofthe other. Combining values from the two systems may result in nonconformance with the specification. The inch-pound units shall apply unless the “M”designation of this specification is specified in the order.

HeatTreatment: Hot-finished tubes shall be heat treated at a temperature of 1200 °F [650 °C] or higher. Cold-finished tubes shall, after the final cold finishing, be heat treated at a temperature of 1200 °F [650 °C] or higher, or tubing may be furnished in the full-annealed, isothermal annealed, or normalized and tempered condition.

Chemical Composition Of ASTM A209 Grade T1a

Element	Composition, %
Element	Grade T1a
Carbon	0.15–0.25
Manganese	0.30–0.80
Phosphorus, max	0.025
Sulfur, max	0.025
Silicon	0.10–0.50
Molybdenum	0.44–0.65

Mechanical Properties Of ASTM A209 Grade T1a

Grade T1a
Tensile strength, min, ksi [MPa]	53 [365]
Yield strength, min, ksi [MPa]	38 [195]
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	1.50 A
When standard round 2-in. or 50-mm gage length or smaller proportionally sized specimen with the gage length equal to 4D (four times the diameter) is used	22
Brinell Hardness Number (Tubes 0.200 in. [5.1 mm] and over in Wall Thickness), HBW	153
Rockwell Hardness Number (Tubes less than 0.200 in. [5.1 mm] in Wall Thickness), HRB	81