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| ITEM | Standard Number | Descriptions |
|---|---|---|
| 1 | NF A 49-214 | Steel tubes. Seamless austenitic steel tubes for use at high temperatures. Dimensions (with normal tolerances). Technical conditions of delivery |
| 2 | NF A 35-578 | Iron and steel. Stainless steel for high temperature application |
| Elements | Min.（≥） | Max.（≤） | Similar | Remarks |
|---|---|---|---|---|
| C | 0.04 | 0.08 | ||
| Si | 1.00 | |||
| Mn | 2.00 | |||
| P | 0.040 | |||
| S | 0.030 | |||
| Cr | 17.00 | 19.00 | ||
| Ni | 11.00 | 13.00 | ||
| Mo | ||||
| B | 0.0015 | 0.0060 | ||
| Nb+Ta | 8×C | 1.00 |
| Tensile strength | 131～297 | σb/MPa |
| Yield Strength | 188 | σ 0.2 ≥/MPa |
| Elongation | 15 | δ5≥(％) |
| ψ | - | ψ≥(％) |
| Akv | - | Akv≥/J |
| HBS | 456～449 | - |
| HRC | 30 | - |
| Thermal expansion | 24-75 | e-6/K |
| Thermal conductivity | 20-91 | W/m.K |
| Specific heat | 450-460 | J/kg.K |
| Melting temperature | 6718-5393 | 째C |
| Density | 5175-8878 | kg/m3 |
| Resistivity | 0.50-0.60 | Ohm.mm2/m |
| Steel Grade | Specification | Processing range(mm) |
| 347F20 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 |