UNS J94204｜GX40CrNiSi25‑20｜1.4848｜ZG40Cr25Ni20Si2
HK40 is a widely‑used high‑carbon 25Cr‑20Ni austenitic heat‑resistant cast alloy per ASTM A297 standard. Thanks to its balanced carbon, chromium and nickel content, this material delivers outstanding high‑temperature creep‑rupture strength, superior oxidation resistance and good anti‑carburizing performance under long‑term high‑temperature service.
| Element | Content |
|---|---|
| C | 0.35‑0.45 |
| Cr | 24.0‑28.0 |
| Ni | 18.0‑22.0 |
| Si | ≤2.00 |
| Mn | ≤2.00 |
| P | ≤0.04 |
| S | ≤0.04 |
| Mo | ≤0.50 |
| Fe | Balance |
Mechanical Properties (Solution‑treated condition)
Tensile strength Rm: ≥425 MPa
Yield strength Rp0.2: ≥240 MPa
Elongation A: ≥10%
Working Temperature
Continuous operating temperature: 950℃‑1100℃
Short‑term peak temperature: up to 1150‑1200℃
✅ Product Advantages
Excellent high‑temperature creep resistance, resist deformation under sustained high‑temperature load
Good high‑temperature oxidation resistance, anti‑scale peeling
Reliable anti‑carburizing performance for heat‑treatment and petrochemical furnaces
Fair thermal‑cycle fatigue resistance for repeated heating‑cooling working condition
Solution annealing treatment to eliminate casting internal stress, optimize microstructure
📌 Typical HK40 Casting Parts
Furnace grate bar / furnace grate segments
Hearth plates, furnace liners, heat‑resistant liners
Heat‑treatment furnace baskets, trays, fixtures, supports
Radiant tubes, reformer tubes for petrochemical industry
Incinerator components, sintering machine wear parts
Our Manufacturing Capacity
We produce HK40 castings via sand casting, lost‑foam casting, investment casting and centrifugal casting.
Strict solution heat treatment at 1150‑1200℃ is performed for every batch.
We support OEM & ODM custom production according to your drawings or samples.
