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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 nonconformance 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 |
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) |
