GX2CrNiMoCuN20-18-6 (1.4557) chemical composition
High-molybdenum, nitrogen-alloyed fully austenitic cast steel supplied solution annealed and water quenched (+AT). Used for pumps, valves and fittings in seawater, desalination, pulp bleaching and chemical service where chloride pitting and crevice corrosion are the governing risk.
- Designation
- GX2CrNiMoCuN20-18-6
- Material no.
- 1.4557
- Standard
- EN 10283
- Also known as
- Cast 6Mo / cast 254, ≈ ASTM A351 / A743 / A744 CK3MCuN (UNS J93254), ≈ 1.4547 X1CrNiMoCuN20-18-7 (wrought), ≈ UNS S31254 / 254 SMO (wrought)
- Family
- Stainless cast steel
Chemical composition (mass %)
| Element | min | max |
|---|---|---|
| CCarbon | – | 0.025 |
| SiSilicon | – | 1.00 |
| MnManganese | – | 1.20 |
| PPhosphorus | – | 0.03 |
| SSulphur | – | 0.01 |
| CrChromium | 19.5 | 20.5 |
| NiNickel | 17.5 | 19.5 |
| MoMolybdenum | 6.00 | 7.00 |
| CuCopper | 0.50 | 1.00 |
| NNitrogen | 0.18 | 0.24 |
| FeIron | remainder | |
Basis of values: Limits per EN 10283.
We cast GX2CrNiMoCuN20-18-6
Tsitouras Foundry supplies stainless steel sand castings – and centrifugal castings for bushings and sleeves – with the heat treatment each grade requires (solution annealing; quenching and tempering for martensitic grades), spectrometric chemical analysis, mechanical testing and NDT, EN 10204 3.1 certificates, and CNC machining to the finished part in the group's own machine shop.
- Sand casting at our foundry in Mandra, Attica; centrifugal casting for bushings, sleeves and liners
- Heat treatment at the foundry (water, oil or air quench); CNC machining in our machine shop in Perama
- Spectrometer analysis of every heat, mechanical testing and NDT
- EN 10204 3.1 inspection certificates; ISO 9001 (both plants) and ISO 14001 (foundry) certified
Other grades in this family
For information only, without warranty: limits per the cited standard or, where stated, typical or house values; ≈ marks a comparable grade, not an equivalent. The current edition of the standard, the purchase order and the drawing govern.