Pipeline steel plate

Product Application: Low-pressure / medium-pressure crude oil and natural gas transmission pipelines, steel pipes for industrial and civil water supply and drainage, sewage treatment pipelines, low-pressure fluid transport pipelines for industrial, power, and metallurgical sectors, scaffolding pipes, mechanical structure support pipes, pile driving pipes, etc.

Delivery conditions:The goods can be delivered under various conditions, such as hot rolling, normalization, tempering, quenching, N+T, T+Q, etc.

Specifications & Standards:Refer to the table below

Consultation Hotline: 0086-371-55023661

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Executive StandardsAPI 5L/API 5L M (Standard for Carbon Steel and Low-Alloy Steel Seamless & Welded Pipes for Pipelines)Equivalent Grades: ASTM A283 Gr.C, GB/T 700 Q235B, EN 10025 S235JR
Specification Range– Thickness: 1.5 – 50 mm (conventional pipeline plate thickness; thick plates must meet flaw detection requirements)- Width: 1000 – 4800 mm; Length: 3000 – 20000 mm (cut-to-size plates customizable for pipeline forming needs)- Delivery Form: Hot-Rolled (HR) plate, Controlled-Rolled (CR) plate, Normalized plate (recommended for thick plates ≥ 20mm)
Chemical Composition (%) (Melting Analysis)C ≤ 0.26, Si ≤ 0.40, Mn: 0.80-1.30, P ≤ 0.035, S ≤ 0.035, Cu ≤ 0.30 (residual element), Ni ≤ 0.30 (residual element)Note: Carbon Equivalent (CEV) ≤ 0.42% (ensures weldability)
Mechanical Properties (Room Temperature)– Yield Strength (σs): ≥ 235 MPa (thickness ≤ 12.5mm); ≥ 225 MPa (12.5-25mm); ≥ 215 MPa (25-50mm)- Tensile Strength (σb): 370 – 510 MPa- Elongation (A5): ≥ 22%- Impact Energy (Akv): ≥ 27 J (0℃, Charpy V-notch, optional requirement)- Hardness: ≤ 137 HB (hot-rolled state)
Heat Treatment State– Conventional: Hot-Rolled (HR)/Controlled-Rolled (CR) – no subsequent heat treatment required- Thick Plates (≥ 20mm): Normalized (880-920℃ air cooling) for grain refinement and toughness improvement- Core Requirement: Eliminate rolling internal stress to ensure structural stability after welding
Processing Adaptability– Welding: No preheating needed (thickness ≤ 12mm); preheat to 80-150℃ for thickness ＞ 12mm; use E43 series electrodes (e.g., E4315); no post-weld tempering required for simple structures- Cutting: Laser cutting (≤ 20mm), plasma cutting (4-30mm), flame cutting (＞ 20mm) – no special preheating required- Bending/Forming: Cold bending radius ≥ 1.5× plate thickness (avoids cracking); directly suitable for spiral welded pipe and straight-seam welded pipe forming
Application Fields– Oil & Gas Transmission Pipelines: Low/medium-pressure crude oil and natural gas pipelines (onshore long-distance pipelines, urban gas networks)- Water Supply & Drainage Pipelines: Industrial/civil water supply/drainage steel pipes, sewage treatment pipelines- Industrial Pipelines: Low-pressure fluid transmission pipelines for chemical, power, and metallurgical industries (e.g., cooling water, compressed air pipelines)- Structural Pipes: Scaffolding pipes, mechanical structure support pipes, pile driving pipes
Inspection Requirements– Routine Testing: Chemical composition analysis, tensile test, bending test, surface quality inspection (no cracks, scars)- Non-Destructive Testing (NDT): Ultrasonic flaw detection (API 5L S4 level, optional; 100% flaw detection recommended for thick plates)- Certificate Requirements: Provide EN 10204 3.1 material certificate, including composition and mechanical property test reports
Core Characteristics– Excellent Weldability: Low-carbon & low-sulfur design with CEV ≤ 0.42% – extremely low welding crack sensitivity- Superior Formability: Elongation ≥ 22% – no cracking risk during cold bending or pipe rolling- Cost-Effective: Carbon steel material with high cost-performance, ideal for low-pressure working conditions- Strong Versatility: Compatible with multiple processing technologies; matches API 5L X42 and lower-grade pipelines
Service Environment Limitations– Applicable Temperature: -20℃ ~ +300℃ (toughness evaluation required beyond this range)- Medium Compatibility: Suitable for neutral/weakly corrosive media; anti-corrosion treatment (e.g., 3PE coating) required for strong acid/alkali environments- Pressure Limitation: Recommended for pipeline systems with design pressure ≤ 4.0 MPa (upgrade to API 5L X42+ for high-pressure conditions)

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