1.1 This specification covers minimum-wall-thickness, seamless medium-carbon steel, boiler tubes, and boiler flues, including safe ends (see Note 1), arch and stay tubes, and superheater tubes.
NOTE 1: This type is not suitable for safe endings by forge welding.
1.2 The tubing sizes and thicknesses usually furnished to this specification are 1/2 in. to 5 in. [12.7 to 127 mm] in outside diameter and 0.035 to 0.500 in. [0.9 to 12.7 mm], inclusive, in minimum wall thickness. Tubing having other dimensions may be furnished, provided such tubes comply with all other requirements of this specification.
1.3 Mechanical property requirements do not apply to tubing smaller than 1/8 in. [3.2 mm] in inside diameter or 0.015 in. [0.4 mm] in thickness.
1.4 This specification covers grades A-1 and C of Seamless Medium-Carbon Boiler and Superheater Tubes with different chemical and tensile requirements. (Table 1, Table 3, and Section 11.)
OD:1/2in-5in(12.7-127mm),
WT: 0.035in-0.500in(0.9-12.7mm)
Grade: ASTM A210 Grade A1, ASTM A210 Grade C
Application: For high, middle, low-pressure boiler and pressure purpose
2)Chemical Composition:
|
Element |
Grade A1 |
Grade C |
|
C% |
Max. 0.27 |
Max. 0.35 |
|
Mn% |
Max. 0.93 |
0.29-1.06 |
|
P% |
Max. 0.035 |
Max. 0.035 |
|
S% |
Max. 0.035 |
Max. 0.035 |
|
Si% |
Max. 0.10 |
Max. 0.10 |
3)Mechanical Properties:
| Item |
Grade A1 |
Grade C |
|
Tensile Strength Loading Ksi (Mpa) |
min 60(415) |
min 70(485) |
|
Yield Strength loading Ksi (Mpa) |
min 37(255) |
min 40(275) |
|
Elongation(50mm)% A |
min 30 |
min 30 |
|
Hardness |
Max 79HRB |
Max 89HRB |
4)Manufacturing Process:
Seamless and cold-finished/hot finished
5)Heat treatment:
Hot-finished Tube need not be heat treated, cold-finished shall be given a subcritical anneal, a full anneal, or normalizing heat treatment after the final cold-finishing process.
6)Surface Condition:
If picking or shot blasting or both are required, this shall be specifically stated in the order.
7)Mechanical Tests Required:
1.Tension test
2.Flattening Test
3.Flaring test
4.Hardness test
5.Hydrostatic test
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