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Chemical Composition and Mechanical Properties of Submerged Arc Welded Spiral Seam Steel Pipe with ГОСТ 1050 Steel Grade
1、 Chemical composition
Carbon (C): 0.37% -0.45% (medium to high carbon content, improving hardness and strength).
Silicon (Si): 0.17% -0.37% (deoxidizer, improves material uniformity).
Manganese (Mn): 0.50% -0.80% (enhances strength and toughness).
Phosphorus (P): ≤ 0.035% (strictly control harmful elements and reduce cold brittleness).
Sulfur (S): ≤ 0.035% (reduces the tendency for hot cracking).
Other elements (Cr, Ni, Cu): all ≤ 0.25% (trace impurities controlled).
2、 Mechanical performance
Strength and plasticity
Tensile strength (Rm): ≥ 570-630 MPa (typical strength range for medium to high carbon steel).
Yield strength (Re): ≥ 335-375 MPa (suitable for medium load scenarios).
Elongation rate (δ 5): ≥ 14% -19% (meeting general plasticity requirements).
Other performance
Impact toughness: ≥ 39-47 J (impact resistance at room temperature).
Hardness: ≤ 187-229 HB (hardness range after annealing).
3、 Manufacturing process and characteristics
Welding process: Double sided submerged arc welding (SAWH) is used, with spiral seam forming, ensuring uniformity and strength of the weld seam.
Application scenario: Suitable for medium and low-pressure fluid transportation in water engineering, petrochemical pipelines, agricultural irrigation, and other fields.
(Note: ГОСТ 1050 is a high-quality carbon structural steel with Russian standards. Specific parameters should be based on standard documents or manufacturer technical agreements.)
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