ASTM A995 Grade 4A (CD3MN) — Chemical Composition & Mechanical Properties
ASTM A995 Grade 4A (CD3MN) is a duplex stainless steel grade for duplex steel castings (UNS J92205, EN / W.Nr 1.4470). It is also known as Cast 2205. This sheet summarises its chemical composition limits, minimum mechanical properties, heat treatment and typical service. Teshi Group manufactures valves with bodies in this grade.
ASTM A995 Grade 4A (CD3MN) at a glance
| Specification | ASTM A995 Grade 4A (CD3MN) |
|---|---|
| Material family | Duplex stainless steel |
| Product form | Duplex steel castings |
| UNS number | J92205 |
| EN / W.Nr equivalent | 1.4470 |
| Also known as | Cast 2205 |
| PREN (min values) | 30.9 |
| Document | TG-MG-075 · Rev. 1 · October 2026 |
Typical service
Cast duplex valve bodies and pump casings
Heat treatment
Solution treated 1120 °C min, water quench
Chemical composition of ASTM A995 Grade 4A (CD3MN) (weight %)
Single values are maximums unless shown as a range or “min”.
Mechanical properties
| Tensile strength, min | 620 MPa |
|---|---|
| Yield strength (0.2 % offset), min | 415 MPa |
| Elongation, min | 25 % |
| Hardness | Not specified |
About duplex stainless steel
Duplex stainless steels have a mixed microstructure of roughly half austenite and half ferrite. The result is about twice the yield strength of 316L, much better resistance to chloride stress-corrosion cracking, and pitting resistance (PREN 34–36) between 316L and the 6Mo grades.
Reference information compiled from the published standard for convenience. It does not replace the current edition of the governing standard, which takes precedence. Verify critical dimensions and properties before design, purchase or fabrication. Teshi Engineers & Sales Promoters (P) Ltd accepts no liability for errors or omissions.
International equivalents of ASTM A995 Grade 4A (CD3MN)
All equivalents| Standard system | Nearest equivalent grade |
|---|---|
| USA — ASTM / ASME | ASTM A995 Grade 4A (CD3MN) · ASME SA-995 Grade 4A (CD3MN) |
| USA — UNS | J92205 |
| Europe — EN designation | GX2CrNiMoN22-5-3 (EN 10213) |
| Europe — W.Nr | 1.4470 |
| Japan — JIS | SCS10 (approx.) |
| China — GB / NB | ZG03Cr22Ni6Mo3N |
Equivalents are the nearest commonly cited grades. Chemistry, mechanical properties and testing differ between standards — compare them before substituting one for another.
Standards for ASTM A995 Grade 4A (CD3MN)
All material standardsFAQ
ASTM A995 Grade 4A (CD3MN): common questions
What is the minimum yield strength of ASTM A995 Grade 4A (CD3MN)?
415 MPa, with a minimum tensile strength of 620 MPa.
What is the carbon content of ASTM A995 Grade 4A (CD3MN)?
0.03 max %.
What is the PREN of ASTM A995 Grade 4A (CD3MN)?
About 31, calculated as Cr + 3.3Mo + 16N using the specification minimum values. Typical heats are a little higher.
What is the UNS number and EN equivalent of ASTM A995 Grade 4A (CD3MN)?
UNS J92205; the nearest European designation is W.Nr 1.4470. Equivalents are close but not identical — check the specification if substituting.
How is ASTM A995 Grade 4A (CD3MN) heat treated?
Solution treated 1120 °C min, water quench.
What is the Chinese (GB) equivalent of ASTM A995 Grade 4A (CD3MN)?
The nearest Chinese equivalent is ZG03Cr22Ni6Mo3N. Equivalents are close but not identical — compare chemistry and properties before substituting.
What is the JIS equivalent of ASTM A995 Grade 4A (CD3MN)?
The nearest Japanese (JIS) equivalent is SCS10 (approx.).
Does Teshi Group supply ASTM A995 Grade 4A (CD3MN)?
Teshi Group manufactures valves with bodies in this grade. Send your size, rating and quantity to info@teshigroup.com for a quotation with EN 10204 3.1 certificates.
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