ASME SA209 Seamless carbon-molybdenum alloy steel boiler and superheater tubes
Standard: ASTM A209 / ASME SA209
Steel grade: Carbon-molybdenum alloy steel
Material shall conform to the applicable requirements of specification A450/A450M
| 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 |
| Phosphorous, 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 |
Process: cold drawn
The tubes cover minimum wall thickness.
Application: tubing for boilers
Dimensional range:
OD: 19.05-76.2mm
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
Test
| Steel grade |
Rockwell hardness HRB |
| Grade T1 | 80 |
| Grade T1a | 81 |
| Grade T1b | 77 |
Mechanical properties
| Grade T1 | Grade T1b | Grade T1a | |
| Tensile strength, min, MPa | 380 | 365 | 415 |
| Yield strength, min, MPa | 205 | 195 | 220 |
| Elongation in 50mm, min, % | 30 | 30 | 30 |
Test
- One flattening test shall be made on specimens from each of two tubes from each lot or fraction thereof.
- One flaring test shall be made on specimens from each of two tubes from each lot or fraction thereof.
- For tension and hardness tests, the term lot applies to all tubes prior to cutting, of the same nominal diameter and wall thickness that are produced from the same heat of steel.
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
