ASME SA213 Seamless alloy steel boiler, U-bend superheater, and heat exchanger tubes
Standard: ASTM A213 / ASME SA213
Steel grade: ferritic alloy steels
Material shall conform to the applicable requirements of specification A450/A450M
| T5 | T11 | T22 | T23 | T91 | |
| Carbon, max, % | 0.15 | 0.05-0.15 | 0.05-0.15 | 0.04-0.10 | 0.08-0.12 |
| Manganese, % | 0.30-0.60 | 0.30-0.60 | 0.30-0.60 | 0.1-0.6 | 0.30-0.60 |
| Phosphorous, max. % | 0.025 | 0.025 | 0.025 | 0.03 | 0.02 |
| Sulfur, max, % | 0.025 | 0.025 | 0.025 | 0.01 | 0.01 |
| Silicon, max, % | 0.50 | 0.50-1.00 | 0.50 | 0.50 | 0.2-0.5 |
| Chromium, max, % | 4.0-6.0 | 1.00-1.50 | 1.90-2.60 | 1.9-2.6 | 8.0-9.5 |
| Molybdenum, % | 0.45-0.65 | 0.44-0.65 | 0.87-1.13 | 0.05-0.30 | 0.85-1.05 |
| Vanadium, min, % | - | - | - | - | 0.18-0.25 |
Process: cold drawn
The tubes cover minimum wall thickness.
Application: tubular heat exchangers, superheaters, boilers.
Dimensional range:
OD: 12.7-76.2mm
Length: up to 24m
Any specific size is to be discussed before offer
The tube be 100% eddy current tested
Ultrasonic test is as option
Straightness ≤1mm/1000mm
Roughness: Ra ≤0.8
Heat treatment
All tubes of grades, except T23, T91 shall be reheated and furnished in the full-annealed, normalized and tempered condition.
Mechanical properties
| T5 | T11 | T22 | T23 | T91 | |
|
Tensile strength min, ksi (MPa) |
60 (415) | 60 (415) | 60 (415) | 74 (510) | 85 (585) |
|
Yield strength min, ksi (MPa) |
30 (205) | 30 (205) | 30 (205) | 58 (400) | 60 (415) |
|
Elongation in 50mm min, % |
30 | 30 | 30 | 20 | 20 |
Hardness
T9 shall have a hardness not exceeding 179HB or 89HRB
Grade T91, T92 shall have a hardness not exceeding 250HB or 25HRC
Grade T23 shall have a hardness not exceeding 220HB or 97HRB
Grade T5, T9, T11, T22 shall have a hardness not exceeding 163HB or 85HRB.
Test
- One tension test shall be made on a specimen for lots of not more than 50 tubes. Tension tests shall be made on specimens from two tubes for lots of more than 50 tubes
- One flattening test shall be made on specimens from each end of one finished tube, not the one used for the flaring test, from each lot.
- One flaring test shall be made on specimens from each end of one finished tube, not the one used for the flattening test, from each lot.
- Each tube shall be subjected to the hydrostatic test, or, instead of this test, a nondestructive electric test may be used when specified by the client.
Surface quality
- Cold drawn steel tubes shall be free of scale and suitable for inspection. A slight amount of oxidation is not considered scale.
- Any special finish requirement shall be subject to agreement between the supplier and the purchaser.
Tubes shall be delivered with square cut ends. The ends are free of excessive burrs.
The tubes are bundled in the waterproof plastic sheet and packed in the wooden cases
The case is most suitable for hanging by forklift.
EN10204-3.1 MTC shall be issued
EN10204-3.2 MTC is as option
