USA AMS SA-268/SA-268M, SA-268 S44400 Specialsteel Specification for Seamless and Welded Ferritic and Martensitic Stainless Steel Tubing for General Service and Mechanical Properties, Chemical Element, Cross Reference, Datasheet.
| Category | Class | Grade | Type | Standard | Country | Application | 
|---|---|---|---|---|---|---|
| Steel Grades | Specialsteel | SA-268 S44400 | Ferrite | AMS | USA | Specification for Seamless and Welded Ferritic and Martensitic Stainless Steel Tubing for General Service | 
| C | Mn | Si | P | S | Cr | Ni | Mo | N | 
|---|---|---|---|---|---|---|---|---|
| ≤0.025 | ≤1.00 | ≤1.00 | ≤0.04 | ≤0.03 | 17.50 -19.50 | ≤1.00 | 1.75 -2.50 | ≤0.035 | 
| Yield Rp0.2 (MPa) | Tensile Rm (MPa) | Impact KV/Ku (J) | Elongation A (%) | Reduction in cross section on fracture Z (%) | As-Heat-Treated Condition | Brinell hardness (HBW) | 
|---|---|---|---|---|---|---|
| 228 (≥) | 583 (≥) | 31 | 33 | 42 | Solution and Aging, Annealing, Ausaging, Q+T,etc | 233 | 
| Temperature (°C) | Modulus of elasticity (GPa) | Mean coefficient of thermal expansion 10-6/(°C) between 20(°C) and | Thermal conductivity (W/m·°C) | Specific thermal capacity (J/kg·°C) | Specific electrical resistivity (Ω mm²/m) | Density (kg/dm³) | Poisson’s coefficient, ν | 
|---|---|---|---|---|---|---|---|
| 44 | - | - | 0.41 | - | |||
| 142 | 925 | - | 41.3 | 334 | - | ||
| 515 | - | 32 | 24.2 | 414 | 344 | 
Heat treated : 1514°C - 1637°C
| Grade | Standard | Country | Application | 
|---|---|---|---|
| 1.4449 | |||
| 1.4446 | |||
| 1.4448 | |||
| 1.4440 | |||
| 1.4440 | |||
| 444 | |||
| S44400 | |||
| 444 | |||
| S44450 | |||
| TP44400 | |||
| S44400 | |||
| TP44400 | |||
| S44400 | |||
| S44400 | |||
| S44400 | |||
| AMS 6444G | |||
| SUS444 | |||
| SUS444 | |||
| SUS444 | |||
| SUS444TP | 
| SA-268/SA-268M | Specification for Seamless and Welded Ferritic and Martensitic Stainless Steel Tubing for General Service | SA-268-SA-268M.pdf | 
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