CN7M Austenitic Stainless Steel Casting Material
Austenitic Stainless Steel
Introduction
CN7M is an austenitic stainless steel grade covered by ASTM A351, ASTM A743, ASTM A744. Typical family applications include pump casings, impellers and covers.
| Field | Value |
|---|---|
| Designation | CN7M |
| Material Type | Stainless Steel |
| Sub Type | Austenitic Stainless Steel |
| Product Form | casting |
Manufacturing Process
Investment Casting
Shell Molding Casting
Sand Casting
Equivalent Materials
| Standard | Material Grade |
|---|---|
| EN 10283 | GX4NiCrCuMo30-20-4 |
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 | CN7M | UNS N08007 |
| ASTM A743 | Standard Specification for Castings, Iron-Chromium, Iron-Chromium-Nickel, Corrosion Resistant, for General Application | 03 | CN7M | UNS N08007 |
| ASTM A744 | Standard Specification for Castings, Iron-Chromium-Nickel, Corrosion Resistant, for Severe Service | 00e1 | CN7M | UNS N08007 |
Related Casting Products
Physical Properties
N/A
Chemical Composition
| Element | ASTM A351Edition 03 | ASTM A743Edition 03 | ASTM A744Edition 00e1 |
|---|---|---|---|
| C | ≤ 0.07 % | ≤ 0.07 % | ≤ 0.07 % |
| Si | ≤ 1.50 % | ≤ 1.50 % | ≤ 1.50 % |
| Mn | ≤ 1.50 % | ≤ 1.50 % | ≤ 1.50 % |
| P | ≤ 0.040 % | ≤ 0.04 % | ≤ 0.04 % |
| S | ≤ 0.040 % | ≤ 0.04 % | ≤ 0.04 % |
| Cr | 19.0–22.0 % | 19.0–22.0 % | 19.0–22.0 % |
| Ni | 27.5–30.5 % | 27.5–30.5 % | 27.5–30.5 % |
| Mo | 2.0–3.0 % | 2.0–3.0 % | 2.0–3.0 % |
| Cu | 3.0–4.0 % | 3.0–4.0 % | 3.0–4.0 % |
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 |
ASTM A744–00e1 · Heat treatment
| Step | Operation | Temperature | Cooling |
|---|---|---|---|
| 1 | Heat | ≥ 2050 °F / ≥ 1120 °C[2] | — |
| 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
ASTM A744 · Edition 00e1
[2] Heat treatment: sufficient time to heat casting to temperature
Mechanical Properties
Core Mechanical Properties
ASTM A351 — 03 · Table 3 — Normative
| Property | heat treated |
|---|---|
| Tensile Strength | ≥ 62 ksi ≥ 425 MPa |
| Yield Strength (Rp0.2) | ≥ 25 ksi ≥ 170 MPa |
| Elongation | ≥ 35.0 % |
ASTM A743 — 03 · Table S12.1 — Normative
Notes
ASTM A743 · Edition 03
[1] Tensile Strength/Yield Strength/Elongation: Applies only when Supplementary Requirement S12 is specified; Condition: heat treatment per; separately cast keel block per S12.2 unless S12.3 agreement applies
ASTM A744 · Edition 00e1
[2] Tensile Strength/Yield Strength/Elongation: Applies only when Supplementary Requirement S22 is specified; Condition: heat treated to the same production procedure as the casting; separately cast keel block per S22.2
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. Other cast components used in this material family include pump casings, impellers and covers. Typical settings include chemical and pharmaceutical processing, pulp-and-paper plants and selected water-handling systems.
Suitability for a particular acid, concentration or temperature remains grade- and process-specific.
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Email Us for a QuoteLast Updated: November 6, 2026