Designation Cross-Reference

221-490 — ASTM Equivalent

Holding a datasheet that specifies 221-490 (BS 1503)? The valve-grade equivalent, its properties, and certified supply of the matching ASTM grade.

What is the ASTM equivalent of 221-490?

221-490 is a BS 1503 designation corresponding to ASTM A105 (Forged Carbon Steel A105) for industrial valve service. The full grade data is below - equivalence is by nominal chemistry and mechanical class, so confirm composition and heat-treat condition against the governing standard before substituting in critical service.

A105

Carbon Steel

Forged Carbon Steel A105 - forged form.

Service temperature-29°C to +538°C

Nominal compositionC ≤ 0.35%, Mn 0.60–1.05%, Si 0.10–0.35%, P ≤ 0.035%, S ≤ 0.040%. Cu, Ni, Cr, Mo, V individually ≤ 0.40% each.

Typical service: High-pressure steam (with IBR certification, per ASME B31.1); Hydraulic systems; Natural gas and LPG at high pressure

Also designated:221-490 [BS 1503]C22.8 [DIN/EN]1.0460 [DIN/EN]

Reviewed by Materials Engineering, Vajra Industrial SolutionsDiscipline: Valve Metallurgy & Materials SelectionLast reviewed: 20 June 2026

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Engineering references

A105 full grade pageForged Carbon Steel A105 Equivalence MatrixAll 43 grades across 7 systems Designation lookup directoryEvery foreign designation indexed