Introduction
CA6NM is a heat-treatable martensitic stainless steel casting grade covered by ASTM A743. Its established uses include large hydraulic components. Casting process options include Investment Casting, Shell Molding Casting and Sand Casting, subject to the applicable specification and component requirements.
| Field | Value |
|---|---|
| Designation | CA6NM |
| Material Type | Stainless Steel |
| Sub Type | Martensitic Stainless Steel |
| Product Form | casting |
Manufacturing Process
Investment Casting
Shell Molding Casting
Sand Casting
Equivalent Grades
- GX4CrNi13-4 (1.4317) — ISO 11972[1]
Notes
- [1] Source: ISO 11972:2023, Table A.1 (similar grade reference).
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 | CA6NM | UNS J91540 |
Related Casting Products
Physical Properties
N/A
Chemical Composition
| Element | ASTM A743Edition 03 |
|---|---|
| C | ≤ 0.06 % |
| Si | ≤ 1.00 % |
| Mn | ≤ 1.00 % |
| P | ≤ 0.04 % |
| S | ≤ 0.03 % |
| Cr | 11.5–14.0 % |
| Ni | 3.5–4.5 % |
| Mo | 0.40–1.0 % |
Heat Treatment
ASTM A743–03 · Air cooling and final tempering
| Step | Operation | Temperature | Cooling |
|---|---|---|---|
| 1 | Heat | ≥ 1850 °F / ≥ 1010 °C | — |
| 2 | Air cool | ≤ 200 °F / ≤ 95 °C | air |
| 3 | Optional intermediate temper | — | — |
| 4 | Final temper | 1050–1150 °F / 565–620 °C | — |
Mechanical Properties
| Property | ASTM A743Edition 03 |
|---|---|
| Tensile Strength | ≥ 110 ksi[1] ≥ 755 MPa[1] |
| Yield Strength | ≥ 80 ksi[1] ≥ 550 MPa[1] |
| Elongation | ≥ 15 %[1] |
| Reduction of Area | ≥ 35 %[1] |
| Brinell Hardness | ≤ 285 HB[2] |
Notes
ASTM A743 · Edition 03
[1] Tensile Strength/Yield Strength/Elongation/Reduction of Area: Applies only when Supplementary Requirement S12 is specified; Condition: heat treatment per; separately cast keel block per S12.2 unless S12.3 agreement applies
[2] Brinell Hardness: Applies only when Supplementary Requirement S14 is specified; Condition: non-austenitic grade; treatment; non-austenitic; per manufacturer–purchaser agreement (S14.2)
Welding Conditions
N/A
Applications
Typical casting applications include hydraulic turbine runners and associated power-generation castings.
Last Updated: October 16, 2026