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