Heat-resistant cast steel
HK (25Cr-20Ni) chemical composition
Heat-resistant cast steel HK (25Cr-20Ni)
25Cr-20Ni fully austenitic grade of ASTM A297 with a broad carbon range. Higher nickel than HH gives better creep strength; used for furnace rolls, radiant tubes, trays and fixtures.
- Designation
- HK
- Standard
- ASTM A297
- Also known as
- 25Cr-20Ni
- Family
- Heat-resistant cast steel
Chemical composition (mass %)
| Element | min | max |
|---|---|---|
| CCarbon | 0.20 | 0.60 |
| SiSilicon | – | 2.00 |
| MnManganese | – | 2.00 |
| PPhosphorus | – | 0.04 |
| SSulphur | – | 0.04 |
| CrChromium | 24.0 | 28.0 |
| NiNickel | 18.0 | 22.0 |
| MoMolybdenum | – | 0.50 |
| FeIron | remainder | |
Basis of values: Limits per ASTM A297.
We cast HK
We produce heat-resistant castings by sand casting, and by centrifugal casting for cylindrical parts such as rings, bushings and sleeves. Every heat is analysed by OES; heat treatment, CNC machining in the group's Perama machine shop and EN 10204 3.1 certificates are available.
- 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
GX25CrNiSi20-14 1.4832GX40CrNiSi25-12 1.4837GX40CrNiSi25-20 1.4848GX40CrNiSi27-4 1.4823GX40NiCrSi35-26 1.4857GX40NiCrSiNb35-26 1.4852HFHHHIHK40 UNS J94204HPNb UNS N28701HTHUHWHXGX40CrSi28 1.4776GX130CrSi29 1.4777
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.