What is the mechanical property of 09CuPCrNi-A Corten Steel?

Dec 11, 2025 Leave a message

The composition of 09CuPCrNi steel typically includes alloying elements such as copper, chromium, and nickel, which contribute to its corrosion resistance properties. These elements react with the atmosphere to form a protective layer of rust, which helps to prevent further corrosion of the steel.

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09CuPCrNi-A Chemical composition:

09CuPCrNi-A Chemical composition

Grade	The Element Max (%)
09CuPCrNi-A	C	Si	Mn	P	S
	≤ 0.12	0.25-0.75	0.20-0.50	0.06-0.12	≤ 0.020
	Cr	Cu	Ni	RE
	0.30-1.25	0.25-0.50	0.12-0.65

09CuPCrNi-A Mechanical Properties

Grade	Thickness	Yield	Tensile	Elongation	Delivery state
09CuPCrNi-A	mm	Min Mpa	Mpa	Min %
	4<	345	480	24	Hot rolling
	≤ 4	310	440	26	Cold rolling

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Thickness-Dependent Property Adjustments

For plates with thickness t > 16mm, yield strength decreases slightly per standard requirements to account for heat treatment and forming effects:

16mm < t ≤ 40mm: Rp0.2 ≥ 335 MPa

40mm < t ≤ 63mm: Rp0.2 ≥ 325 MPa

Elongation remains ≥ 22% for t ≤ 63mm.

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Key Mechanical Performance Characteristics

Ductility: High elongation (≥22%) ensures good formability, suitable for bending, cutting, and welding without cracking.

Toughness: The 20°C impact toughness ≥ 34 J meets general structural needs; for low-temperature applications (≤ 0°C), normalized heat treatment is recommended to improve low-temperature toughness (KV ≥ 27 J at -20°C).

Weldability: Low carbon equivalent (CEV ≤ 0.45%) reduces cold cracking risk during welding, making it compatible with common welding processes (SMAW, GMAW, GTAW).

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Application Implications

These mechanical properties make 09CuPCrNi-A ideal for light-to-medium load-bearing outdoor structures (e.g., garden frames, decorative screens, flower boxes, and low-rise building components) where both corrosion resistance and structural stability are required.

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