CK20 Austenitic Stainless Steel Casting Material
Austenitic Stainless Steel
Introduction
CK20 is an austenitic stainless steel grade covered by ASTM A351, ASTM A743. Typical family applications include pump casings, impellers, covers and pipe fittings.
| Field | Value |
|---|---|
| Designation | CK20 |
| Material Type | Stainless Steel |
| Sub Type | Austenitic Stainless Steel |
| Product Form | casting |
Manufacturing Process
Investment Casting
Shell Molding Casting
Sand Casting
Equivalent Materials
N/A
Similar Materials
N/A
Reference Standards
| Standard | Standard Title | Edition | Specification | Identifier |
|---|---|---|---|---|
| ASTM A351 | Standard Specification for Castings, Austenitic, Austenitic-Ferritic (Duplex), for Pressure-Containing Parts | 03 | CK20 | UNS J94202 |
| ASTM A743 | Standard Specification for Castings, Iron-Chromium, Iron-Chromium-Nickel, Corrosion Resistant, for General Application | 03 | CK20 | UNS J94202 |
Related Casting Products
Physical Properties
N/A
Chemical Composition
| Element | ASTM A351Edition 03 | ASTM A743Edition 03 |
|---|---|---|
| C | 0.04–0.20 % | ≤ 0.20 % |
| Si | ≤ 1.75 % | ≤ 2.00 % |
| Mn | ≤ 1.50 % | ≤ 2.00 % |
| P | ≤ 0.040 % | ≤ 0.04 % |
| S | ≤ 0.040 % | ≤ 0.04 % |
| Cr | 23.0–27.0 % | 23.0–27.0 % |
| Ni | 19.0–22.0 % | 19.0–22.0 % |
| Mo | ≤ 0.50 % | — / Not specified |
Heat Treatment
ASTM A351–03 · Heat treatment
| Step | Operation | Temperature | Cooling |
|---|---|---|---|
| 1 | Heat treat | ≥ 2100 °F / ≥ 1150 °C | — |
| 2 | Quench or rapid cool | — | water quench or rapid cooling by other means |
ASTM A743–03 · Heat treatment
| Step | Operation | Temperature | Cooling |
|---|---|---|---|
| 1 | Heat | ≥ 2000 °F / ≥ 1093 °C[1] | — |
| 2 | Quench or rapid cool | — | water quench or rapid cooling by other means |
Notes
ASTM A743 · Edition 03
[1] Heat treatment: sufficient time to heat casting to temperature
Mechanical Properties
Core Mechanical Properties
ASTM A351 — 03 · Table 3 — Normative
| Property | heat treated |
|---|---|
| Tensile Strength | ≥ 65 ksi ≥ 450 MPa |
| Yield Strength (Rp0.2) | ≥ 28 ksi ≥ 195 MPa |
| Elongation | ≥ 30.0 % |
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
Welding Conditions
N/A
Applications
Typical casting applications include pressure-containing cast components such as valve bodies, flanges and fittings, subject to grade-specific service requirements. Other cast components used in this material family include pump casings, impellers, covers and pipe fittings. Typical settings include chemical and pharmaceutical plants, food and beverage machinery, and filling, mixing and liquid-handling systems.
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Email Us for a QuoteLast Updated: November 6, 2026