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| Grade | Code | AISI | Martensitic Stainless Steel |
| 1.4313 | X3CrNiMo13-4 | 415 |
1.4313 is a soft martensitic stainless steel that combines high mechanical strength with good impact toughness. In the tempered condition, it exhibits good toughness and can be used at temperatures ranging from approximately -60°C to 300°C. The material offers moderate corrosion resistance and machinability and can be readily polished. Although it can be welded using arc welding processes, suitable preheating and post-weld heat treatment conditions may be required.
| C % | Si % | Mn % | P % | S % | Cr % | Ni % | Mo % | N % |
| ≤ 0.05 | ≤ 0.70 | ≤ 1.50 | ≤ 0.040 | ≤ 0.015 | 12.00–14.00 | 3.50–4.50 | 0.30–0.70 | ≥ 0.020 |
| Form | Condition | Rp0.2 [MPa] | Rm [MPa] | Elongation [%] | Hardness [HB] | Density [g/cm³] |
| Bar | QT780 | ≥ 620 | 780–980 | ≥ 15 | 245–309 | 7.70 |
| Bar | QT900 | ≥ 800 | 900–1100 | ≥ 12 | 285–346 | 7.70 |
| Plate | QT780 | ≥ 630 | 780–980 | ≥ 15 | 245–309 | 7.70 |
| Plate | QT900 | ≥ 800 | 900–1100 | ≥ 11 | 285–346 | 7.70 |
Note: The values for bars apply to d ≤ 160 mm, while the values for plates apply to t ≤ 75 mm. The hardness values are reference ranges taken from manufacturer technical data sheets.
| Industry | Most Common Products |
| Hydropower generation | Turbine runners, turbine guide vanes, turbine shafts |
| Oil and gas | Valve bodies, valve gates and seats, wellhead pressure components |
| Chemical and petrochemical | Process valves, pump housings, pump shafts |
| Industrial pump systems | Pump impellers, pump covers, high-pressure pump shafts |
| Compressors and centrifuges | Compressor shafts, compressor impellers, centrifuge rotors |
| Power plants and reactor technology | Turbine rotors, turbine blades, reactor pressure components |
1.4313's final performance is governed mainly by quenching and tempering. The controlled martensitic structure produced by heat treatment allows strength, hardness and toughness to be balanced for the intended service conditions. QT780 provides higher ductility and impact toughness, whereas QT900 provides higher yield strength and hardness. Welding can create a hard, untempered heat-affected zone; therefore, preheating according to section thickness, controlled heat input and post-weld tempering are important. For this reason, an order should not specify only grade "1.4313"; the required QT condition, section size, hardness and impact-toughness acceptance criteria must also be stated clearly.
1.4313, X3CrNiMo13-4, AISI 415, S41500
| Product Form | ASTM | DIN/EN |
| Bar | ASTM A276/A276M – UNS S41500; ASTM A479/A479M – UNS S41500 | DIN EN 10088-3 – X3CrNiMo13-4; DIN EN 10272 |
| Plate | ASTM A240/A240M – UNS S41500 | DIN EN 10088-2 – X3CrNiMo13-4; DIN EN 10028-7 |
S165M / 1.4418 / X4CrNiMo16-5-1 – This is the closest alternative. While retaining its soft martensitic structure, it offers high strength, good toughness and higher corrosion resistance.
15-5PH / XM-12 / 1.4545 / S15500 – It may be considered for components requiring high strength, good transverse toughness and corrosion resistance.
13-8PH / PH 13-8 Mo / XM-13 / 1.4534 / S13800 – It is a strong alternative for critical components requiring high fracture toughness, mechanical strength and resistance to stress corrosion cracking.
BÖHLER Edelstahl – BÖHLER N400
BGH Edelstahlwerke – 1.4313 / X3CrNiMo13-4
Note: The information contained in this datasheet is for informational purposes only; no liability is accepted.
