Grades · Structural & HSLA Steel · 09CuPCrNi-A

09CuPCrNi-A

Data under review

09CuPCrNi-A is China’s GB/T 4171 weathering steel — the name itself lists the alloy system (Cu-P-Cr-Ni) — and is the domestic counterpart of SPA-H and Corten A. It is produced in volume for containers, rail stock and architectural plate.

DINS355J0WP type (near)

AISIA242 type (near)

JISSPA-H (near)

CategoryStructural & HSLA Steel

Chemical composition

Element	Content (%)
C	≤0.12
Si	0.25–0.75
Mn	0.20–0.50
P	0.07–0.15
S	≤0.035
Cr	0.30–1.25
Ni	≤0.65
Cu	0.25–0.55

Weight percent, per the governing standard ranges. Actual values per heat are on the mill certificate.

Properties

Yield strength	≥345 MPa
Tensile strength	≥480 MPa
Density	7.85 g/cm³

Heat treatment

Supplied hot rolled.

Equivalent grades

Standard	Designation
din	S355J0WP type (near)
aisi	A242 type (near)
jis	SPA-H (near)
gb	09CuPCrNi-A (GB/T 4171)

Compare side by side: 09CuPCrNi-A vs SPA-H · 09CuPCrNi-A vs Corten A

Equivalents overlap in chemistry and use but are not always identical — see our equivalents guide before substituting in certified designs.

Applications & Processing

Applications: Containers, railway wagons, facades, bridges, power-plant structures.

Processing: As SPA-H; matching weathering filler for exposed welds.

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Source: GB/T 4171 published ranges · Last updated 2026-11-03. Data is indicative — verify critical values against the governing standard and mill certificate before use.