Equivalent lookup
Designation Cross-Reference

J03003 — ASTM Equivalent

Holding a datasheet that specifies J03003 (UNS)? The valve-grade equivalent, its properties, and certified supply of the matching ASTM grade.

What is the ASTM equivalent of J03003?

J03003 is a UNS designation corresponding to ASTM A352 LCB (Low Temperature Carbon Steel LCB) 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.

A352 LCB

Carbon Steel

Low Temperature Carbon Steel LCB - cast form.

Service temperature-46°C to +343°C
Nominal compositionC ≤ 0.30%, Mn 0.50–1.00%, Si ≤ 0.60%, P ≤ 0.025%, S ≤ 0.025%

Typical service: Natural gas pipeline block valves - compressor station isolation in cold climates; LPG / propane / butane storage terminals - tank outlet isolation valves; Nitrogen and CO₂ storage valve bodies - food-grade gas storage

Also designated:J03003 [UNS]1.0558 (GP240GH) [EN]
Reviewed by Materials Engineering, Vajra Industrial SolutionsDiscipline: Valve Metallurgy & Materials SelectionLast reviewed: 20 June 2026

Connected Engineering

Need valves in J03003 / its ASTM equivalent?

We supply A352 LCB valves - the J03003 equivalent - with EN 10204 3.1 material certification. Share the datasheet for a 24-hour quote.

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