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| ITEM | Standard Number | Descriptions |
|---|---|---|
| 1 | A 646/A 646M (2011) | Premium Quality Alloy Steel Blooms and Billets for Aircraft and Aerospace Forgings |
| Elements | Min.（≥） | Max.（≤） | Similar | Remarks |
|---|---|---|---|---|
| C | 0.38 | 0.43 | ||
| Si | 0.20 | 0.40 | ||
| Mn | 0.50 | 0.70 | ||
| Cr | ||||
| Ni | 0.30 | 0.40 | ||
| Mo | ||||
| Co | ||||
| W | 0.95 | 1.30 | ||
| Al | ||||
| Cu | ||||
| Ti | ||||
| Fe |
| Tensile strength | 238～276 | σb/MPa |
| Yield Strength | 582 | σ 0.2 ≥/MPa |
| Elongation | 16 | δ5≥(％) |
| ψ | - | ψ≥(％) |
| Akv | - | Akv≥/J |
| HBS | 979～691 | - |
| HRC | 30 | - |
| Thermal expansion | 77-73 | e-6/K |
| Thermal conductivity | 81-36 | W/m.K |
| Specific heat | 450-460 | J/kg.K |
| Melting temperature | 6687-6330 | 째C |
| Density | 1081-9958 | kg/m3 |
| Resistivity | 0.50-0.60 | Ohm.mm2/m |
| Steel Grade | Specification | Processing range(mm) |
| A 646 Grade Nit. 135 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 |