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ASTM A209/A209M Seamless Carbon-Molybdenum Alloy-Steel Boiler and Superheater Carbon Steel Heat Exchanger Tubes
Standard: ASTM A209 / A209M Seamless Carbon-Molybdenum Alloy-Steel Boiler and Super heater Tubes,Cold drawn and hot rolled seamless steel tubes for Boiler and Super heater
Applications: Boiler, Heat Exchanger, Cold Condensers
Size Range: OD:12.7-127mm WT:0.9-12.7mm
Steel Grade: T1, T1a, T1b
Manufacture:
Killed steel material.
The tubes are made by seamless process either hot-finished or cold-finished
Seamless Carbon-Molybdenum Alloy-Steel Boiler and Super heater Tubes
Cold drawn and hot rolled seamless steel tubes for Boiler and Super heater.
| STEEL GRADE AND CHEMICAL COMPOSITIONS | ||||||
| Seel Grade | C | Mn | P | S | Si | Mo |
| T1 | 0.10-0.20 | 0.30-0.80 | ≤0.025 | ≤0.025 | 0.10-0.50 | 0.44-0.65 |
| T1a | 0.15-0.25 | 0.30-0.80 | ≤0.025 | ≤0.025 | 0.10-0.50 | 0.44-0.65 |
| T1b | ≤0.14 | 0.30-0.80 | ≤0.025 | ≤0.025 | 0.10-0.50 | 0.44-0.65 |
| Mechanical Properties | |||||
| Seel Grade | Tensile strength (Mpa) | Yield Strength (Mpa) | δfixed (Pipe Segment S≥8mm vertical) | δfixed (S＜8mm vertical) | δfixed (Round brilliant) |
| T1 | ≥380 | ≥205 | ≥30 | See note | ≥22 |
| T1a | ≥415 | ≥220 | ≥30 | See note | ≥22 |
| T1b | ≥365 | ≥195 | ≥30 | See note | ≥22 |
| Note: S＜8mm vertical Elongation is the basic value minus 1.5%,per wall thickness minus 0.8mm | |||||
| HARDNESS | ||
| Seel Grade | HB S ≥5.1mm | HRB S≤ 5.1mm |
| T1 | ≤146 | ≤80 |
| T1a | ≤153 | ≤81 |
| T1b | ≤137 | ≤77 |
Delivery condition and Heat treatment:
Cold Drawn Seamless and Hot Rolled Seamless need Heat treatment .minimum temperature is 650℃
If Delivery condition is annealing, isothermal annealing, normalizing+ tempering tempering minimum temperature is 650℃
Hot-finished tubes are heat treated at a temperature of 1200℉ (650℃) or higher.
Reference Documents:
ASTM A450/A450M Specification for General Requirements for Carbon, Ferritic Alloy, and Austenitic Ally Steel Tubes
ASTM A941 Terminology Relating to Steel, Stainless Steel, Related Alloys and Ferroalloys