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Butt weld fittingsWrought butt-weld fittingsTG-MG-017 · Rev. 0 · October 2026

ASTM A403 WP304L — Chemical Composition & Mechanical Properties

ASTM A403 WP304L is an ASTM specification for wrought butt-weld fittings (UNS S30403). This sheet summarises its chemical composition limits and minimum mechanical properties. Typical use: welded corrosion-resistant piping.

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Chemical composition of ASTM A403 WP304L (weight %)

C0.030 max
Mn2.00 max
P max0.045
S max0.030
Si1.00 max
Cr18.0–20.0
Ni8.0–12.0
Mo—

Mechanical properties

Tensile strength, min485 MPa
Yield strength, min170 MPa
Elongation, min28 %
HardnessNot specified

Heat treatment

Solution annealed at 1040 °C min, rapid cool

Typical service

Welded corrosion-resistant piping

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.

FAQ

ASTM A403 WP304L: common questions

What is the minimum yield strength of ASTM A403 WP304L?

170 MPa, with a minimum tensile strength of 485 MPa.

What is the carbon content of ASTM A403 WP304L?

0.030 max %.

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