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Chemical and Mechanical Properties of RINA-AH36 Spiral Steel Pipe
1、 Chemical composition
The chemical composition of RINA-AH36 spiral steel pipe meets the high-strength ship structural steel standards of the classification society, and the core elements are as follows:
Carbon (C): 0.15%~0.18% (balance strength and weldability);
Silicon (Si): 0.15%~0.50% (improves oxidation resistance);
Manganese (Mn): 1.20%~1.45% (enhances strength and low-temperature toughness);
Phosphorus (P), sulfur (S): ≤ 0.025%, ≤ 0.015% (strictly control impurities);
Niobium (Nb): 0.015%~0.025% (refine grain size, optimize toughness);
Other elements: Trace alloys such as chromium (Cr ≤ 0.2%), nickel (Ni ≤ 0.4%), titanium (Ti ≤ 0.02%), etc.
2、 Mechanical performance
Basic performance:
Yield strength (σ s): ≥ 355 MPa；
Tensile strength (σ b): 490~630 MPa;
Post fracture elongation (δ 5): ≥ 21% (when thickness ≤ 50mm).
Impact toughness (0 ℃ test):
Longitudinal impact energy:
Thickness ≤ 50mm: ≥ 34 J；
50~70mm：≥ 41 J；
70~150mm：≥ 50 J；
Lateral impact energy:
Thickness ≤ 50mm: ≥ 24 J；
50~70mm：≥ 27 J；
70~150mm：≥ 34 J.
Special performance:
Z-directional performance: optional Z15/Z25/Z35 grades (cross-sectional shrinkage rate ≥ 15%/25%/35% respectively);
Welding performance: Supports submerged arc welding and electric arc welding, with weld strength matching the base metal;
Corrosion resistance: The surface has been sandblasted and coated to adapt to marine environments.
3、 Application Fields
RINA-AH36 spiral steel pipe is mainly used in high load and harsh environmental scenarios:
Shipbuilding: main structure of the ship, deck, and bulkheads;
Marine engineering: offshore platforms, drilling equipment support pipes;
Low temperature scenarios: polar ships, low-temperature storage and transportation facilities;
Infrastructure projects: Port machinery, bridge load-bearing structures.
(Note: Specific parameters may be adjusted due to thickness, delivery status, and additional technical requirements.)
ADD：Chengnan Industrial Development Zone, Yanshan County, Hebei Province
Domestic phone number：0086-317-6689999
International call：0086-317-6165555
E-mail:9905791@qq.com
