Introduction
HK40 is a austenitic stainless steel grade specified in ASTM A351 for pressure-containing cast components. Casting process options include Investment Casting, Shell Molding Casting and Sand Casting, subject to the applicable specification and component requirements.
| Field | Value |
|---|---|
| Designation | HK40 |
| Material Type | Stainless Steel |
| Sub Type | Austenitic Stainless Steel |
| Product Form | casting |
Manufacturing Process
Investment Casting
Shell Molding Casting
Sand Casting
Equivalent Grades
- GX40CrNiSi25-20 (1.4848) — EN 10295[1]
Notes
- [1] Chemical comparison (similar grade reference).
Similar Materials
N/A
Reference Standards
| Standard | Standard Title | Edition | Specification | Identifier |
|---|---|---|---|---|
| ASTM A351 | Standard Specification for Castings, Austenitic, Austenitic-Ferritic (Duplex), for Pressure-Containing Parts | 03 | HK40 | UNS J94204 |
Related Casting Products
Physical Properties
N/A
Chemical Composition
| Element | ASTM A351Edition 03 |
|---|---|
| C | 0.35–0.45 % |
| Si | ≤ 1.75 % |
| Mn | ≤ 1.50 % |
| P | ≤ 0.040 % |
| S | ≤ 0.040 % |
| Cr | 23.0–27.0 % |
| Ni | 19.0–22.0 % |
| Mo | ≤ 0.50 % |
Heat Treatment
ASTM A351–03 · As cast
| Step | Operation |
|---|---|
| 1 | As cast |
Mechanical Properties
| Property | ASTM A351Edition 03 |
|---|---|
| Tensile Strength | ≥ 62 ksi ≥ 425 MPa |
| Yield Strength (Rp0.2) | ≥ 35 ksi ≥ 240 MPa |
| Elongation | ≥ 10.0 % |
Welding Conditions
N/A
Applications
Typical casting applications include pressure-containing cast components such as valve bodies, flanges and fittings, subject to grade-specific service requirements.
Last Updated: October 14, 2026