ASTM A268/ASME SA268 Standard Specification for Seamless and Welded Ferritic and Martensitic Stainless Steel Tubing for General Service
| Specification | ASTM A268/ASME SA268 Standard Specification for Seamless and Welded Ferritic and Martensitic Stainless Steel Tubing for General Service |
| Standard | ASTM A268, ASME SA268 |
| Equivalents | |
| Materials | TP444, 18Cr-2Mo, S44400 |
Chemistry Composition of ASTM A268/ASME SA268 TP444, 18Cr-2Mo, S44400
| C, % | Mn, % | P, % | S, % | Si, % | Cr, % | Ni, % | Mo, % | N, % | Ti+Nb, % |
| 0.025 max | 1.00 max | 0.040 max | 0.030 max | 1.00 max | 17.5-19.5 | 1.00 max | 1.75-2.50 | 0.035 max | [0.20+4(C+N)]-0.80 |
Mechanical Properties of ASTM A268/ASME SA268 TP444, 18Cr-2Mo, S44400
| Tensile Strength , MPa | Yield Strength, MPa | Elongation, % | Hardness, HB |
| 415 min | 275 min | 20 min | 217 max |