ASTM A182 F22 Cl.1 — Chemical Composition & Mechanical Properties
ASTM A182 F22 Cl.1 is a chrome-moly alloy steel grade for forged flanges & fittings (UNS K21590, EN / W.Nr ≈ 1.7380 (10CrMo9-10)). It is also known as 2¼Cr-1Mo. This sheet summarises its chemical composition limits, minimum mechanical properties, heat treatment and typical service. Teshi Group manufactures flanges and fittings in this grade.
ASTM A182 F22 Cl.1 at a glance
| Specification | ASTM A182 F22 Cl.1 |
|---|---|
| Material family | Chrome-moly alloy steel |
| Product form | Forged flanges & fittings |
| UNS number | K21590 |
| EN / W.Nr equivalent | ≈ 1.7380 (10CrMo9-10) |
| Also known as | 2¼Cr-1Mo |
| Document | TG-MG-135 · Rev. 1 · October 2026 |
Typical service
Lower-strength 2¼Cr-1Mo forgings; used where hardness control is needed
Heat treatment
Annealed, normalised and tempered, or quenched and tempered
Chemical composition of ASTM A182 F22 Cl.1 (weight %)
Single values are maximums unless shown as a range or “min”.
Mechanical properties
| Tensile strength, min | 415 MPa |
|---|---|
| Yield strength (0.2 % offset), min | 205 MPa |
| Elongation, min | 20 % |
| Hardness | 170 HBW max |
About chrome-moly alloy steel
Chrome-moly steels are low-alloy steels with 1–9 % chromium and 0.5–1 % molybdenum. Chromium gives oxidation and sulphidation resistance; molybdenum gives creep strength at high temperature. They are the standard choice for steam and hot hydrocarbon service above the carbon-steel range.
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 A182 F22 Cl.1
All equivalents| Standard system | Nearest equivalent grade |
|---|---|
| USA — ASTM / ASME | ASTM A182 F22 Cl.1 · ASME SA-182 F22 Cl.1 |
| USA — UNS | K21590 |
| Europe — EN designation | 10CrMo9-10 |
| Europe — W.Nr | 1.7380 |
| Japan — JIS | STPA24 / SFVAF22B |
| China — GB / NB | 12Cr2MoG (GB/T 5310) |
| China — old GB designation | 12Cr2Mo1 |
| UK — BS (withdrawn) | BS 3604 622 |
Equivalents are the nearest commonly cited grades. Chemistry, mechanical properties and testing differ between standards — compare them before substituting one for another.
Same alloy in other product forms
| Product form | Specification / grade |
|---|---|
| Forged flanges & fittings | ASTM A182 F22 Cl.3 |
| Wrought butt-weld fittings | ASTM A234 WP22 Cl.1 |
| Seamless pipe | ASTM A335 P22 |
| Wrought butt-weld fittings | ASTM A234 WP22 Cl.3 |
| Pressure-vessel plate | ASTM A387 Grade 22 Cl.2 |
Standards for ASTM A182 F22 Cl.1
All material standardsFAQ
ASTM A182 F22 Cl.1: common questions
What is the minimum yield strength of ASTM A182 F22 Cl.1?
205 MPa, with a minimum tensile strength of 415 MPa.
What is the carbon content of ASTM A182 F22 Cl.1?
0.05–0.15 %.
What is the UNS number and EN equivalent of ASTM A182 F22 Cl.1?
UNS K21590; the nearest European designation is W.Nr ≈ 1.7380 (10CrMo9-10). Equivalents are close but not identical — check the specification if substituting.
How is ASTM A182 F22 Cl.1 heat treated?
Annealed, normalised and tempered, or quenched and tempered.
What is the Chinese (GB) equivalent of ASTM A182 F22 Cl.1?
The nearest Chinese equivalent is 12Cr2MoG (GB/T 5310), formerly 12Cr2Mo1. Equivalents are close but not identical — compare chemistry and properties before substituting.
What is the JIS equivalent of ASTM A182 F22 Cl.1?
The nearest Japanese (JIS) equivalent is STPA24 / SFVAF22B.
Does Teshi Group supply ASTM A182 F22 Cl.1?
Teshi Group manufactures flanges and fittings 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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