Introduction
CN7MS is a stainless steel grade specified in ASTM A743, ASTM A744 for corrosion-resistant castings for severe service. Casting process options include Investment Casting, Shell Molding Casting and Sand Casting, subject to the applicable specification and component requirements.
| Field | Value |
|---|---|
| Designation | CN7MS |
| 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 A743 | Standard Specification for Castings, Iron-Chromium, Iron-Chromium-Nickel, Corrosion Resistant, for General Application | 03 | CN7MS | UNS J94650 |
| ASTM A744 | Standard Specification for Castings, Iron-Chromium-Nickel, Corrosion Resistant, for Severe Service | 00e1 | CN7MS | UNS J94650 |
Related Casting Products
Physical Properties
N/A
Chemical Composition
| Element | ASTM A743Edition 03 | ASTM A744Edition 00e1 |
|---|---|---|
| C | ≤ 0.07 % | ≤ 0.07 % |
| Si | 2.50–3.50 % | 2.50–3.50 % |
| Mn | ≤ 1.00 % | ≤ 1.0 % |
| P | ≤ 0.04 % | ≤ 0.04 % |
| S | ≤ 0.03 % | ≤ 0.03 % |
| Cr | 18.0–20.0 % | 18.0–20.0 % |
| Ni | 22.0–25.0 % | 22.0–25.0 % |
| Mo | 2.5–3.0 % | 2.5–3.0 % |
| Cu | 1.5–2.0 % | 1.5–2.0 % |
Heat Treatment
ASTM A743–03 · Heat treatment and water quenching
| Step | Operation | Temperature / holding time | Cooling |
|---|---|---|---|
| 1 | Heat | 2100–2150 °F / 1150–1180 °C; Holding time: ≥ 2 h | — |
| 2 | Quench | — | water |
ASTM A744–00e1 · Heat treatment and water quenching
| Step | Operation | Temperature / holding time | Cooling |
|---|---|---|---|
| 1 | Heat | 2100–2150 °F / 1150–1180 °C; Holding time: ≥ 2 h | — |
| 2 | Quench | — | water |
Mechanical Properties
| Property | ASTM A743Edition 03 | ASTM A744Edition 00e1 |
|---|---|---|
| Tensile Strength | ≥ 70 ksi[1] ≥ 485 MPa[1] | ≥ 70 ksi[2] ≥ 485 MPa[2] |
| Yield Strength | ≥ 30 ksi[1] ≥ 205 MPa[1] | ≥ 30 ksi[2] ≥ 205 MPa[2] |
| Elongation | ≥ 35 %[1] | ≥ 35 %[2] |
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 pump and valve castings for chemical-processing, pharmaceutical and marine equipment.
Last Updated: October 13, 2026