ASTM A105 — Chemical Composition & Mechanical Properties
ASTM A105 is a carbon steel grade for forged flanges & fittings (UNS K03504, EN / W.Nr ≈ P250GH (1.0460)). It is also known as A105N. 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 A105 at a glance
| Specification | ASTM A105 |
|---|---|
| Material family | Carbon steel |
| Product form | Forged flanges & fittings |
| UNS number | K03504 |
| EN / W.Nr equivalent | ≈ P250GH (1.0460) |
| Also known as | A105N |
| Document | TG-MG-001 · Rev. 1 · October 2026 |
Typical service
General carbon-steel piping, -29 to 425 °C
Heat treatment
Not mandatory for standard flanges up to Class 300; anneal, normalize, N&T or Q&T required above Class 300, for special designs and similar cases (A105N = normalized)
Chemical composition of ASTM A105 (weight %)
Other elements and limits: V 0.08 max; Cu+Ni+Cr+Mo+V 1.00 max; Cr+Mo 0.32 max
Single values are maximums unless shown as a range or “min”.
Mechanical properties
| Tensile strength, min | 485 MPa |
|---|---|
| Yield strength, min | 250 MPa |
| Elongation, min | 22 % |
| Hardness | 197 HBW |
About carbon steel
Carbon steel is iron with up to about 0.35 % carbon and 1–1.6 % manganese, and no deliberate chromium, nickel or molybdenum. It is the default material for piping in water, steam, oil, gas and general process service from about −29 °C up to roughly 425 °C.
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 A105
All equivalents| Standard system | Nearest equivalent grade |
|---|---|
| USA — ASTM / ASME | ASTM A105 · ASME SA-105 |
| USA — UNS | K03504 |
| Europe — EN designation | P250GH |
| Europe — W.Nr | 1.0460 |
| Japan — JIS | SFVC2A (JIS G3202) |
| China — GB / NB | 20 / 16Mn (NB/T 47008) |
| China — old GB designation | 20 |
| India — IS | IS 2004 Class 3A |
| UK — BS (withdrawn) | BS 1503-221-490 |
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 A105
All material standardsFAQ
ASTM A105: common questions
What is the minimum yield strength of ASTM A105?
250 MPa, with a minimum tensile strength of 485 MPa.
What is the carbon content of ASTM A105?
0.35 max %.
What is the UNS number and EN equivalent of ASTM A105?
UNS K03504; the nearest European designation is W.Nr ≈ P250GH (1.0460). Equivalents are close but not identical — check the specification if substituting.
How is ASTM A105 heat treated?
Not mandatory for standard flanges up to Class 300; anneal, normalize, N&T or Q&T required above Class 300, for special designs and similar cases (A105N = normalized).
What is the Chinese (GB) equivalent of ASTM A105?
The nearest Chinese equivalent is 20 / 16Mn (NB/T 47008), formerly 20. Equivalents are close but not identical — compare chemistry and properties before substituting.
What is the JIS equivalent of ASTM A105?
The nearest Japanese (JIS) equivalent is SFVC2A (JIS G3202).
Does Teshi Group supply ASTM A105?
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.
Related products, data sheets and standards
Weld Neck Flange
OEM manufacturer
View online · PDFTechnical data sheetSlip-On Flange
OEM manufacturer
View online · PDFTechnical data sheetBlind Flange
OEM manufacturer
View online · PDFTechnical data sheetSocket Weld Flange
OEM manufacturer
View online · PDFTechnical data sheetThreaded Flange
OEM manufacturer
View online · PDFTechnical data sheetLap Joint Flange
OEM manufacturer
View online · PDFMaterial productsASTM A105 / A105N Carbon Steel Flanges
Grades, sizes and standards we supply
ViewMaterial productsASTM A234 WPB Carbon Steel Pipe Fittings
Grades, sizes and standards we supply
ViewMaterial productsCarbon Steel, Low-Temperature & High-Yield Pipeline Flanges
Grades, sizes and standards we supply
View
Ready to build to spec?
Share your drawing, bill of materials or technical requirements with the Teshi team.