Introduction
CH8 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 | CH8 |
| Material Type | Stainless Steel |
| Sub Type | Austenitic Stainless Steel |
| Product Form | casting |
Manufacturing Process
Investment Casting
Shell Molding Casting
Sand Casting
Equivalent Grades
N/A
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 | CH8 | UNS J93400 |
Related Casting Products
Physical Properties
N/A
Chemical Composition
| Element | ASTM A351Edition 03 |
|---|---|
| C | ≤ 0.08 % |
| Si | ≤ 1.50 % |
| Mn | ≤ 1.50 % |
| P | ≤ 0.040 % |
| S | ≤ 0.040 % |
| Cr | 22.0–26.0 % |
| Ni | 12.0–15.0 % |
| Mo | ≤ 0.50 % |
Heat Treatment
ASTM A351–03 · Heat treatment
| Step | Operation | Temperature | Cooling |
|---|---|---|---|
| 1 | Heat treat | ≥ 2100 °F / ≥ 1150 °C | — |
| 2 | Quench or rapid cool | — | water quench or rapid cooling by other means |
Mechanical Properties
| Property | ASTM A351Edition 03 |
|---|---|
| Tensile Strength | ≥ 65 ksi ≥ 450 MPa |
| Yield Strength (Rp0.2) | ≥ 28 ksi ≥ 195 MPa |
| Elongation | ≥ 30.0 % |
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 13, 2026