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Specification for Welded Austenitic Steel Boiler, Superheater, Heat-Exchanger, and Condenser Tubes
| ITEM | Standard Number | Descriptions |
|---|---|---|
| 1 | SA-249/SA-249M | Specification for Welded Austenitic Steel Boiler, Superheater, Heat-Exchanger, and Condenser Tubes |
| Elements | Min.（≥） | Max.（≤） | Similar | Remarks |
|---|---|---|---|---|
| C | 0.08 | |||
| Mn | 2.00 | |||
| Si | 1.50 | |||
| P | 0.045 | |||
| S | 0.03 | |||
| Cr | 24.00 | 26.00 | ||
| Ni | 19.00 | 22.00 | ||
| Mo | ||||
| Nb+Ta | 10×C％ | 1.10 |
| Tensile strength | 406～086 | σb/MPa |
| Yield Strength | 752 | σ 0.2 ≥/MPa |
| Elongation | 81 | δ5≥(％) |
| ψ | - | ψ≥(％) |
| Akv | - | Akv≥/J |
| HBS | 095～893 | - |
| HRC | 30 | - |
| Thermal expansion | 79-69 | e-6/K |
| Thermal conductivity | 38-01 | W/m.K |
| Specific heat | 450-460 | J/kg.K |
| Melting temperature | 5670-3711 | 째C |
| Density | 7836-2938 | kg/m3 |
| Resistivity | 0.50-0.60 | Ohm.mm2/m |
| Steel Grade | Specification | Processing range(mm) |
| SA-249 S31040 Stainless Steels | Round Bar and Hollow Bar | Φ1 to Φ2000 |
| Square and Flat Steel | Φ10 to Φ100 | |
| Plate and Sheet | 0.08-800(Thickness)*10-1500(Width)*Length | |
| Tube or Pipe | OD:Φ4-410; WT:1-35 mm; Lenght:10-12000 | |
| Coil and Strip Steel | THK:0.1mm Width:1500mm | |
| Forged | Ring/Cylindrical/Disk |