Super 13Cr, UNS S41426, 1.4415, X2CrNiMoV13-5-2 Stainless Steel according to ASTM A479 and ISO 13680
|Chemical composition %|
|EN||1.4415 / X2CrNiMoV13-5-2|
|<0.03||<0.5||<0.5||<0.04||<0.015||11.5-13.5||4.5-6.5||1.5-2.5||0.1-0.5||<0.01||Cu:<1% for austenitic steel grades||-|
|ISO||13-5-2 / CrNiMo13-5-2|
|ASTM||A479 grade S41425 / Super 13Cr|
1.4415, X2CrNiMoV13-5-2, Super 13 – description
Alloy 1.4415 belongs to the group of martensitic stainless steels, to the subgroup of supermartensitic steels. Compared to other martensitic steels, it is characterised by a low carbon content (up to only 0.03%) and additions of titanium and vanadium. The steel has high tensile strength, impact strength, weldability and abrasion resistance, and is resistant to corrosion in mild corrosive environments.
1.4415 retains its mechanical properties up to temperatures of 350-450°C. Unlike other martensitic steels, 1.4415 can be used at low temperatures.
Steel 1.4415 is used to make components for the petrochemical industry, marine ship equipment and aircraft parts. It's also used in carbon capture and sequestriation units.
1.4415, X2CrNiMoV13-5-2, Super 13 - physical and mechanical properties
Room temperature physical properties of 1.4415 according to ISO 10088-1:2021:
- Density: 7.8 g/cm3
- Electrical resistivity: 0.71 μΩ⋅m
- Specific heat capacity: 500 J/kg⋅K
- Thermal conductivity: 16 W/(m*K)
- Young's modulus: 200 GPA
Mechanical properties of tempered grade 1.4415 bars:
- Yield Strength: >650 MPa
- Tensile Strength: 750-900 MPa
- Elongation: >18%
Mechanical properties of tempered UNS S41425 bars according to ASTM A479:
- Yield Strength: >655 MPa
- Tensile Strength: >825 MPa
- Elongation: >15%
- Hardness: <321 HB
- Percent reduction of area: >45%
According to NACE MR0175, UNS S41425 grade can be used to transport oil, natural gas and can be used in other environments containing hydrogen sulphide H2S and carbon dioxide CO2. According to the recommendations, the partial pressure of H2S should not exceed 10 kPa, because the alloy may be susceptible to sulfide corrosion cracking. If the otherwise 22Cr alloys should be used (i.e. 1.4462), which has significantly higher resistance to chlorides and wet hydrogen sulfide and can resist SCC at ten times higher concentrations.
1.4415 belongs to weldability group 7.2 according to ISO/TR 20172.
Super 13 Cr clearly distinguishes itself from other martensitic steels by its fairly good weldability. Thanks to the very low carbon content, welding does not result in the loss of the martensitic microstructure. Hardening cracks are also less of a problem.
Heat treatment and working
Recommended working and heat treatment parameters:
- Quenching: 950-1050 °C
- Tempering: 600-650 °C
We deliver this steel alloy as:
- Bars according to ASTM A276. A479/A. 479M
- Wires according to ASTM A314
- Forgings according to ASTM A473
- Seamless pipes according to ISO 13680
Replacements, equivalents and other designations:
1.4415, X2CrNiMoV13-5-2, 13-5-2, CrNiMo13-5-2, S41425, Super 13Cr, NACE MR-01-75