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Technical Specifications
Product Overview
Metallurgical Characteristics
API 5L X70 steel features a fine-grained ferrite-pearlite microstructure achieved through controlled thermomechanical processing. The steel's enhanced strength is derived from solid solution strengthening, grain refinement, and precipitation hardening mechanisms. Microalloying elements such as niobium, vanadium, and titanium contribute to grain refinement and precipitation strengthening, while maintaining excellent weldability and toughness properties.
Manufacturing Process
MetalZenith employs advanced controlled rolling technology followed by accelerated cooling to produce API 5L X70 steel. The process begins with electric arc furnace steelmaking, followed by ladle refining and continuous casting. Hot rolling is performed under precisely controlled temperature and deformation conditions, with finish rolling temperatures optimized to achieve the desired austenite grain size. Accelerated cooling immediately after rolling ensures optimal transformation kinetics and microstructure development.
Heat Treatment Considerations
API 5L X70 steel is typically supplied in the as-rolled condition and does not require post-rolling heat treatment. However, stress relief annealing at 580-620°C may be applied after welding or forming operations. The steel exhibits excellent weldability with preheating temperatures typically ranging from 50-150°C depending on thickness and ambient conditions. Post-weld heat treatment is generally not required for most applications.
Quality Standards & Testing
MetalZenith's API 5L X70 steel production adheres to stringent quality control protocols including chemical composition verification, mechanical property testing, non-destructive examination, and dimensional inspection. All products undergo hydrostatic testing, ultrasonic inspection, and Charpy V-notch impact testing. Our quality management system is certified to ISO 9001:2015, API Q1, and other international standards, ensuring consistent product quality and full traceability from raw materials to finished products.
🧪 Chemical Composition
| Element | Composition (%) |
|---|---|
| Carbon (C) | ≤ 0.22 |
| Manganese (Mn) | 1.40 - 1.85 |
| Silicon (Si) | ≤ 0.45 |
| Phosphorus (P) | ≤ 0.025 |
| Sulfur (S) | ≤ 0.015 |
| 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) | ≤ 0.06 |
| Aluminum (Al) | ≤ 0.06 |
| Carbon Equivalent (CE) | ≤ 0.43 |
⚙️ Mechanical Properties
| Property | Value |
|---|---|
| Yield Strength (Rt0.5) | 485 - 635 MPa |
| Tensile Strength (Rm) | 570 - 760 MPa |
| Elongation (A) | ≥ 18% |
| Yield to Tensile Ratio | ≤ 0.93 |
| Hardness (HV10) | 200 - 280 |
| Impact Energy (CVN at 0°C) | ≥ 40 J |
| Impact Energy (CVN at -20°C) | ≥ 27 J |
| Fatigue Limit (107 cycles) | 240 MPa |
| Fracture Toughness (K1c) | 150 - 200 MPa·m0.5 |
| Young's Modulus | 210 GPa |
| Poisson's Ratio | 0.30 |
| Shear Modulus | 80 GPa |
🔬 Physical Properties
| Property | Value |
|---|---|
| Density | 7.85 g/cm³ |
| Melting Point | 1510°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 |
| Thermal Diffusivity | 13.7 mm²/s |
| Coefficient of Linear Expansion (0-100°C) | 11.5×10-6/K |
| Emissivity (oxidized surface) | 0.79 |
📏 Product Specifications
| Specification | Details |
|---|---|
| Available Forms | Seamless Pipes, Welded Pipes, Plates, Sheets, Coils |
| Pipe Diameter Range | 6.35mm - 1422mm (0.25' - 56') |
| Wall Thickness Range | 2.11mm - 50.8mm |
| Plate Thickness Range | 6mm - 100mm |
| Length Range | 5.8m - 18.3m (Random Length, Double Random Length) |
| Manufacturing Standards | API 5L, ASTM A106, EN 10208, ISO 3183, CSA Z245.1 |
| End Preparation | Plain End, Beveled End, Threaded & Coupled |
| Surface Finish | Black, Varnished, 3PE Coated, FBE Coated |
| Dimensional Tolerance | ±1% (OD), ±10% (Wall Thickness) |
| Testing Requirements | Hydrostatic Test, NDT, Chemical Analysis, Mechanical Testing |
| Certification | Mill Test Certificate, Third Party Inspection Available |
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Our Advantages in Processing API 5L X70
Advanced Thermomechanical Processing
MetalZenith utilizes cutting-edge controlled rolling and accelerated cooling technology to achieve optimal microstructure refinement in API 5L X70 steel, ensuring superior mechanical properties and consistent quality throughout the material thickness.
Comprehensive Quality Control System
Our state-of-the-art testing facilities perform complete chemical analysis, mechanical testing, ultrasonic inspection, and dimensional verification on every batch of API 5L X70 steel, guaranteeing compliance with international pipeline standards and customer specifications.
Global Supply Chain Excellence
MetalZenith offers flexible customization options for API 5L X70 steel including various pipe diameters, wall thicknesses, and end preparations, backed by our efficient global logistics network ensuring timely delivery to pipeline projects worldwide.
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