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Technical Specifications
Product Overview
Metallurgical Characteristics
API 5L X65 is a high-strength low-alloy (HSLA) steel specifically engineered for pipeline applications requiring superior strength-to-weight ratios and excellent weldability. The steel achieves its enhanced properties through controlled microalloying with elements such as niobium, vanadium, and titanium, combined with thermomechanical controlled processing (TMCP) to achieve fine-grained ferrite-pearlite microstructures.
Manufacturing Process
MetalZenith employs advanced steelmaking processes including electric arc furnace (EAF) melting, ladle refining, and continuous casting to achieve precise chemical composition control. The hot rolling process utilizes controlled rolling temperatures between 1050-1150°C followed by accelerated cooling to ambient temperature. This TMCP approach ensures optimal grain refinement and precipitation hardening effects from microalloying elements.
Heat Treatment & Processing
X65 grade steel is typically supplied in the as-rolled condition, eliminating the need for additional heat treatment. For specialized applications, normalizing at 900-950°C may be performed to achieve uniform microstructure and stress relief. Welding procedures must follow API 1104 or ASME Section IX requirements, with preheat temperatures typically ranging from 50-150°C depending on thickness and ambient conditions.
Quality Standards & Compliance
All MetalZenith API 5L X65 products comply with API Specification 5L 45th Edition requirements for both PSL1 and PSL2 product specification levels. Additional compliance includes ASTM A106, EN 10208-2, and ISO 3183 standards. Comprehensive testing protocols include chemical analysis per ASTM E415, tensile testing per ASTM A370, Charpy V-notch impact testing per ASTM A370, and non-destructive testing per API 5L requirements. Third-party inspection and certification services are available through accredited agencies including DNV, SGS, and TÜV.
🧪 Chemical Composition
| Element | PSL1 (%) | PSL2 (%) |
|---|---|---|
| Carbon (C) | ≤ 0.28 | ≤ 0.16 |
| Manganese (Mn) | ≤ 1.40 | ≤ 1.65 |
| Phosphorus (P) | ≤ 0.030 | ≤ 0.025 |
| Sulfur (S) | ≤ 0.030 | ≤ 0.015 |
| Silicon (Si) | ≤ 0.45 | ≤ 0.45 |
| Chromium (Cr) | - | ≤ 0.30 |
| Nickel (Ni) | - | ≤ 0.30 |
| Molybdenum (Mo) | - | ≤ 0.15 |
| Copper (Cu) | - | ≤ 0.50 |
| Niobium (Nb) | - | ≤ 0.05 |
| Vanadium (V) | - | ≤ 0.10 |
| Titanium (Ti) | - | ≤ 0.04 |
| Carbon Equivalent (CE) | ≤ 0.43 | ≤ 0.43 |
| Carbon Equivalent (Pcm) | - | ≤ 0.25 |
⚙️ Mechanical Properties
| Property | PSL1 | PSL2 |
|---|---|---|
| Yield Strength (Rp0.2) | 450-570 MPa | 450-570 MPa |
| Tensile Strength (Rm) | 535-760 MPa | 535-760 MPa |
| Yield to Tensile Ratio | ≤ 0.93 | ≤ 0.93 |
| Elongation (A) | ≥ 18% | ≥ 18% |
| Charpy V-Notch Impact Energy (0°C) | - | ≥ 68 J |
| Charpy V-Notch Impact Energy (-10°C) | - | ≥ 40 J |
| Charpy V-Notch Impact Energy (-20°C) | - | ≥ 27 J |
| Hardness (HV10) | ≤ 250 | ≤ 250 |
| Drop Weight Tear Test (DWTT) | - | ≥ 85% Shear Area |
| Fatigue Limit (10^7 cycles) | 180-220 MPa | 180-220 MPa |
| Fracture Toughness (KIC) | - | ≥ 150 MPa·m^0.5 |
| Modulus of Elasticity | 210 GPa | 210 GPa |
🔬 Physical Properties
| Property | Value | Units |
|---|---|---|
| Density | 7.85 | g/cm³ |
| Melting Point | 1510-1540 | °C |
| Thermal Conductivity (20°C) | 54 | W/m·K |
| Thermal Expansion Coefficient (20-100°C) | 12×10-6 | /K |
| Specific Heat Capacity | 500 | J/kg·K |
| Electrical Resistivity (20°C) | 0.16 | µΩ·m |
| Magnetic Permeability | Ferromagnetic | - |
| Curie Temperature | 770 | °C |
| Poisson's Ratio | 0.27-0.30 | - |
| Thermal Diffusivity | 13.8 | mm²/s |
| Coefficient of Linear Expansion (0-100°C) | 11.5×10-6 | /°C |
| Emissivity (Oxidized Surface) | 0.79 | - |
📏 Product Specifications
| Specification | Available Options | Standards |
|---|---|---|
| Product Forms | Seamless Pipes, Welded Pipes, Plates, Coils, Sheets | API 5L, ASTM A106 |
| Pipe Diameter Range | 6.35-1422 mm (1/4'-56') | API 5L |
| Wall Thickness | 2.11-80 mm | API 5L |
| Plate Thickness | 6-150 mm | API 5L, ASTM A516 |
| Coil Width | 1000-2500 mm | API 5L |
| Length | Single Random (4-7m), Double Random (10-12m), Fixed Length | API 5L |
| End Finish | Plain End, Beveled End, Threaded & Coupled | API 5L |
| Surface Finish | Black, Galvanized, Epoxy Coated, 3PE Coated | API 5L, ISO 21809 |
| Dimensional Tolerance | ±0.5% (OD), ±10% (WT) | API 5L |
| Testing Requirements | Hydrostatic, NDT, Chemical Analysis, Mechanical Testing | API 5L PSL1/PSL2 |
| Marking | Stenciled, Low Stress Stamped, Laser Engraved | API 5L |
| Packaging | Bundled, Wooden Cases, Steel Frames, Export Packaging | Custom Requirements |
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Our Advantages in Processing API 5L X65
Advanced TMCP Manufacturing Technology
MetalZenith employs cutting-edge Thermomechanical Controlled Processing (TMCP) with precise temperature control and accelerated cooling systems. Our advanced rolling mills achieve optimal grain refinement and microstructure control, resulting in superior strength-toughness balance and enhanced weldability compared to conventional processing methods.
Comprehensive Quality Control Systems
Our integrated quality management system features real-time chemical composition monitoring, automated mechanical testing, and advanced non-destructive testing capabilities. Every coil and plate undergoes ultrasonic testing, dimensional verification, and surface quality inspection to ensure 100% compliance with API 5L specifications and customer requirements.
Global Supply Chain & Customization
MetalZenith maintains strategic inventory locations worldwide and offers extensive customization capabilities including specific chemistry modifications, dimensional tolerances, surface treatments, and packaging solutions. Our flexible production scheduling and logistics network ensure reliable delivery to pipeline projects globally with full traceability documentation.
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