Introduction
CG6MMN is a austenitic stainless steel grade specified in ASTM A351, ASTM A743 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 | CG6MMN |
| 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 | CG6MMN | UNS J93790 |
| ASTM A743 | Standard Specification for Castings, Iron-Chromium, Iron-Chromium-Nickel, Corrosion Resistant, for General Application | 03 | CG6MMN | UNS J93790 |
Related Casting Products
Physical Properties
N/A
Chemical Composition
| Element | ASTM A351Edition 03 | ASTM A743Edition 03 |
|---|---|---|
| C | ≤ 0.06 % | ≤ 0.06 % |
| Si | ≤ 1.00 % | ≤ 1.00 % |
| Mn | 4.00–6.00 % | 4.00–6.00 % |
| P | ≤ 0.040 % | ≤ 0.04 % |
| S | ≤ 0.030 % | ≤ 0.03 % |
| Cr | 20.50–23.50 % | 20.5–23.5 % |
| Ni | 11.50–13.50 % | 11.5–13.5 % |
| Mo | 1.50–3.00 % | 1.50–3.00 % |
| N | 0.20–0.40 % | 0.20–0.40 % |
| Nb | 0.10–0.30 % | 0.10–0.30 % |
| V | 0.10–0.30 % | 0.10–0.30 % |
Heat Treatment
ASTM A351–03 · Heat treatment
| Step | Operation | Temperature | Cooling |
|---|---|---|---|
| 1 | Heat treat | ≥ 2050 °F / ≥ 1120 °C | — |
| 2 | Quench or rapid cool | — | water quench or rapid cooling by other means |
ASTM A743–03 · Heat treatment
| Step | Operation | Temperature | Cooling |
|---|---|---|---|
| 1 | Heat | ≥ 2050 °F / ≥ 1120 °C[1] | — |
| 2 | Quench or rapid cool | — | water quench or rapid cooling by other means |
Notes
ASTM A743 · Edition 03
[1] Heat treatment: sufficient time to heat casting to temperature
Mechanical Properties
| Property | ASTM A351Edition 03 | ASTM A743Edition 03 |
|---|---|---|
| Tensile Strength | ≥ 85 ksi ≥ 585 MPa | ≥ 85 ksi[1] ≥ 585 MPa[1] |
| Yield Strength (Rp0.2) | ≥ 42.5 ksi ≥ 295 MPa | — / Not specified |
| Elongation | ≥ 30.0 % | ≥ 30 %[1] |
| Yield Strength | — / Not specified | ≥ 42 ksi[1] ≥ 290 MPa[1] |
Notes
ASTM A743 · Edition 03
[1] Tensile Strength/Elongation/Yield Strength: Applies only when Supplementary Requirement S12 is specified; Condition: heat treatment per; separately cast keel block per S12.2 unless S12.3 agreement applies
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