Introduction
CB30 is a ferritic 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 | CB30 |
| Material Type | Stainless Steel |
| Sub Type | Ferritic 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 | CB30 | UNS J91803 |
Related Casting Products
Physical Properties
N/A
Chemical Composition
| Element | ASTM A743Edition 03 |
|---|---|
| C | ≤ 0.30 % |
| Si | ≤ 1.50 % |
| Mn | ≤ 1.00 % |
| P | ≤ 0.04 % |
| S | ≤ 0.04 % |
| Cr | 18.0–21.0 % |
| Ni | ≤ 2.00 % |
| Cu | 0.90–1.20 %[1] |
Notes
ASTM A743 · Edition 03
[1] Cu: B For Grade CB30 a copper content of 0.90 to 1.20% is optional.
Heat Treatment
ASTM A743–03 · Air cooling alternative
| Step | Operation | Temperature | Cooling |
|---|---|---|---|
| 1 | Heat | ≥ 1450 °F / ≥ 790 °C | — |
| 2 | Cool | — | air |
ASTM A743–03 · Furnace cooling alternative
| Step | Operation | Temperature | Cooling |
|---|---|---|---|
| 1 | Heat | ≥ 1450 °F / ≥ 790 °C | — |
| 2 | Cool | — | furnace |
Mechanical Properties
| Property | ASTM A743Edition 03 |
|---|---|
| Tensile Strength | ≥ 65 ksi[1] ≥ 450 MPa[1] |
| Yield Strength | ≥ 30 ksi[1] ≥ 205 MPa[1] |
| Brinell Hardness | ≤ 241 HB[2] |
Notes
ASTM A743 · Edition 03
[1] Tensile Strength/Yield Strength: 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 corrosion-resistant pump and valve components and related industrial castings, subject to service review.
Last Updated: October 13, 2026