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Chemical and Mechanical Properties of S355JR Steel Grade Spiral Steel Pipe
1、 Chemical composition
The chemical composition of S355JR spiral steel pipe complies with the European standard EN10025, with the following core elements and contents:
Carbon (C): ≤ 0.22% (upper limit for some data is 0.24%);
Silicon (Si): ≤ 0.55%；
Manganese (Mn): ≤ 1.60%；
Phosphorus (P): ≤ 0.025% (some data shows ≤ 0.035%);
Sulfur (S): ≤ 0.025% (some data shows ≤ 0.035%);
Copper (Cu): ≤ 0.55% (not explicitly required by some standards).
2、 Mechanical performance
Strength and plasticity:
Yield strength (σ s): ≥ 355 MPa；
Tensile strength (σ b): 470~630 MPa;
Elongation rate (δ 5): ≥ 22% (elongation at break).
Impact toughness:
Impact energy at room temperature (20 ℃): ≥ 27 J (JR grade corresponds to national standard B grade, structural stability).
Process performance:
Weldability: Supports arc welding, submerged arc welding, and gas shielded welding, with weld strength matching the base metal;
Processability: Excellent cold/hot processing performance, easy to cut, bend, and form.
3、 Application Fields
S355JR spiral steel pipe is widely used in the following scenarios:
Infrastructure projects: support structures for bridges, highways, and railway tunnels;
In the field of architecture: load-bearing columns and steel structure connectors for high-rise buildings;
Machinery and ships: engineering machinery frames, ship components;
Energy and Chemical Industry: Medium and Low Pressure Fluid Transport Pipelines, Storage Tank Structures.
4、 Production and Standards
Execution standard: EN10025 (European standard hot-rolled structural steel);
Delivery status: Hot rolling is the main method, and some scenarios can specify normalizing treatment;
Testing requirements: Weld seams must undergo ultrasonic testing and X-ray re examination.
(Note: The impact temperature corresponding to JR grade is 20 ℃. If a lower temperature (such as -20 ℃) toughness requirement is required, J0 or J2 grade can be selected.)
ADD：Chengnan Industrial Development Zone, Yanshan County, Hebei Province
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