Introduction
CB6 is a martensitic stainless steel grade specified in ASTM A743 for general corrosion-resistant castings. Casting process options include Investment Casting, Shell Molding Casting and Sand Casting, subject to the applicable specification and component requirements.
| Field | Value |
|---|---|
| Designation | CB6 |
| Material Type | Stainless Steel |
| Sub Type | Martensitic Stainless Steel |
| Product Form | casting |
Manufacturing Process
Investment Casting
Shell Molding Casting
Sand Casting
Equivalent Grades
- GX4CrNi16-4 (1.4421) — EN 10293[1]
Notes
- [1] Chemical comparison (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 | CB6 | UNS J91804 |
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 | 15.5–17.5 % |
| Ni | 3.5–5.5 % |
| Mo | ≤ 0.5 % |
Heat Treatment
ASTM A743–03 · Forced-air cooling and tempering
| Step | Operation | Temperature | Cooling |
|---|---|---|---|
| 1 | Heat | 1800–1920 °F / 980–1050 °C | — |
| 2 | Forced-air cool | ≤ 120 °F / ≤ 50 °C | forced air |
| 3 | Temper | 1100–1160 °F / 595–625 °C | — |
Mechanical Properties
| Property | ASTM A743Edition 03 |
|---|---|
| Tensile Strength | ≥ 115 ksi[1] ≥ 790 MPa[1] |
| Yield Strength | ≥ 85 ksi[1] ≥ 580 MPa[1] |
| Elongation | ≥ 16 %[1] |
| Reduction of Area | ≥ 35 %[1] |
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
Welding Conditions
N/A
Applications
Typical casting applications include turbine runner blade castings for hydropower equipment.
Last Updated: October 16, 2026