CN7M (UNS N08007) chemical composition
Nickel-rich Cr-Ni-Mo-Cu grade, cast counterpart of Alloy 20 / N08020 (UNS N08007). The copper and high nickel give resistance to sulphuric acid across a wide concentration range; typical for acid pumps and valves.
- Designation
- CN7M
- Material no.
- UNS N08007
- Standard
- ASTM A743 / A351
- Also known as
- ≈ Alloy 20 / N08020 (cast), A743 CN-7M
- Family
- Stainless cast steel
Chemical composition (mass %)
| Element | min | max |
|---|---|---|
| CCarbon | – | 0.07 |
| SiSilicon | – | 1.50 |
| MnManganese | – | 1.50 |
| PPhosphorus | – | 0.04 |
| SSulphur | – | 0.04 |
| CrChromium | 19.0 | 22.0 |
| NiNickel | 27.5 | 30.5 |
| MoMolybdenum | 2.00 | 3.00 |
| CuCopper | 3.00 | 4.00 |
| FeIron | remainder | |
Basis of values: Limits per ASTM A743 / A351.
We cast CN7M
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.