Standard

ASTM A209/A209M

Standard Specification for Seamless Carbon-Molybdenum Alloy-Steel Boiler and Superheater Tubes


Scope

1.1 This specification covers several grades of minimum-wall-thickness, seamless, carbon-molybdenum alloy-steel,boiler and superheater tubes.
1.2 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.
1.3 An optional supplementary requirement is provided and,when desired, shall be so stated in the order.
1.4 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 non conformance with the specification. The inch-pound units shall apply unless the “M”designation of this specification is specified in the order.


Specification

Steel Grade: T1, T1a, T1b

OD: 19.05-76.2MM

WT: 1.65-3.4MM

Length: 5.8M or the length according to customer needs


Chemical Composition

Element

Composition, %

Grade T1

Grade T1a

Grade T1b

Carbon

0.10–0.20

0.15–0.25

0.14 max

Manganese

0.30–0.80

0.30–0.80

0.30–0.80

Phosphorus, max

0.025

0.025

0.025

Sulfur, max

0.025

0.025

0.025

Silicon

0.10–0.50

0.10–0.50

0.10–0.50

Molybdenum

0.44–0.65

0.44–0.65

0.44–0.65


TABLE 2 Tensile Requirements


Grade T1

Grade T1a

Grade T1b

Tensile strength, min, ksi [MPa]

55 [380]

53 [365]

60 [415]

Yield strength, min, ksi [MPa]

30 [205]

28 [195]

32 [220]

Elongation in 2 in. or 50 mm, min, %

30

30

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

1.50 A

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

22

22


Material Comparison Tables (ASTM →KS, JIS, DIN, BS, NBN, NF, UNI)

ASTMSTANDARD

UNS NO.

KOREA/JAPANES

GERMAN

BRITISH

FRENCH

ITALIAN

KS/JIS Symbol

KS/JIS Numbe

Remarks

DIN Type

DIN

Number

Materiral

Number

Remarks

B.S

Number

B.S Grade

Remarks

AFNOR Type

NF Number

Ramarks

UNI Type

UNI Number

Ramarks

A 209

Seamless C-Mo Steel Boiler and Superheater Tubes


















Grade T 1

K11522

STHA 12 / STBA 12

D3572 / G3462

(30)(24)

16 Mo 5


1.5423

(3a)




18 MD 4.05


(3a)

16 Mo5

5462

(37)

Grade T 1a

K12023

STHA 13 /STBA 13

D3572 / G3462

(30)(24)

16 Mo 5


1.5423

(3a)






(3)



(3)

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