CA6NM Martensitic Stainless Steel Casting Material
Martensitic Stainless Steel
Introduction
CA6NM is a heat-treatable martensitic stainless steel casting grade covered by ASTM A743. Typical applications include hydraulic turbine runners and other water-power castings, including Francis runners and impulse wheels.
| 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 Materials
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
Core Mechanical Properties
ASTM A743 — 03 · Table S12.1 — Normative
ASTM A743 — 03 — Normative
| Property | Value |
|---|---|
| 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
Martensitic stainless steel ASTM A743 Grade CA6NM is used for hydraulic turbine runners and other water-power castings, including Francis runners and impulse wheels. Further applications include pump housings and impellers, compressor components and valve bodies in power generation and process equipment. Other cast components used in this material family include runner sections, turbine blades, guide components, pump impellers and pump casings.
Applications include hydroelectric generating equipment, power-station replacement components and turbine refurbishment. Water quality, entrained solids and cavitation conditions remain relevant to the particular installation.
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Email Us for a QuoteLast Updated: November 6, 2026