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Technical Specifications
Product Overview
Metallurgical Characteristics
API 5L X80 is a high-strength low-alloy (HSLA) steel featuring a fine-grained microstructure achieved through controlled rolling and accelerated cooling. The steel exhibits a predominantly ferritic-pearlitic microstructure with dispersed carbide precipitates, providing excellent combination of strength, toughness, and weldability. Microalloying elements including niobium, vanadium, and titanium contribute to precipitation strengthening and grain refinement.
Manufacturing Process
MetalZenith employs advanced Thermomechanical Controlled Processing (TMCP) technology for API 5L X80 production. The process begins with controlled reheating of steel slabs to 1200-1250°C, followed by multi-pass rolling with precise temperature control. The final rolling passes occur below the recrystallization temperature, followed by accelerated cooling to achieve optimal microstructure and mechanical properties. This process ensures consistent grain size and uniform distribution of strengthening precipitates.
Heat Treatment & Processing
The steel is typically supplied in the as-rolled condition without additional heat treatment. However, stress relief annealing at 580-620°C may be applied for specific applications. Welding procedures require preheating to 100-150°C for heavy sections, with interpass temperature control below 250°C. Post-weld heat treatment is generally not required due to the steel's excellent weldability characteristics.
Quality Standards & Testing
MetalZenith's API 5L X80 steel undergoes comprehensive testing including chemical analysis by optical emission spectroscopy, tensile testing, Charpy V-notch impact testing at specified temperatures, and hardness measurements. Non-destructive testing includes ultrasonic examination, magnetic particle inspection, and hydrostatic testing for pipes. All products are manufactured under ISO 9001:2015 quality management system with full traceability documentation and third-party inspection available upon request.
🧪 Chemical Composition
| Element | Composition (%) | Notes |
|---|---|---|
| Carbon (C) | ≤ 0.22 | Low carbon for weldability |
| Manganese (Mn) | 1.20 - 1.85 | Strength enhancement |
| Silicon (Si) | ≤ 0.45 | Deoxidation agent |
| Phosphorus (P) | ≤ 0.025 | Controlled for toughness |
| Sulfur (S) | ≤ 0.015 | Low sulfur grade |
| Chromium (Cr) | ≤ 0.30 | Hardenability improvement |
| Nickel (Ni) | ≤ 0.30 | Toughness enhancement |
| Molybdenum (Mo) | ≤ 0.15 | Strength and hardenability |
| Copper (Cu) | ≤ 0.50 | Corrosion resistance |
| Niobium (Nb) | ≤ 0.06 | Microalloying element |
| Vanadium (V) | ≤ 0.06 | Grain refinement |
| Titanium (Ti) | ≤ 0.06 | Precipitation hardening |
⚙️ Mechanical Properties
| Property | Value | Test Standard |
|---|---|---|
| Yield Strength (Rt0.5) | 555 - 705 MPa | API 5L / ISO 6892 |
| Tensile Strength (Rm) | ≥ 625 MPa | API 5L / ISO 6892 |
| Yield to Tensile Ratio | ≤ 0.93 | API 5L PSL2 |
| Elongation (A) | ≥ 18% | ISO 6892 (Lo = 5.65√So) |
| Charpy V-Notch Impact Energy (0°C) | ≥ 101 J | ISO 148-1 |
| Charpy V-Notch Impact Energy (-10°C) | ≥ 68 J | ISO 148-1 |
| Hardness (HV10) | ≤ 350 | ISO 6507-1 |
| Young's Modulus | 210 GPa | ASTM E111 |
| Poisson's Ratio | 0.30 | ASTM E132 |
| Fatigue Limit (107 cycles) | 280 MPa | ASTM D7791 |
| Fracture Toughness (KIC) | ≥ 150 MPa·m1/2 | ASTM E1820 |
🔬 Physical Properties
| Property | Value | Temperature/Conditions |
|---|---|---|
| Density | 7.85 g/cm³ | 20°C |
| Melting Point | 1510°C | Solidus temperature |
| Thermal Conductivity | 54 W/m·K | 20°C |
| Thermal Expansion Coefficient | 12×10-6/K | 20-100°C |
| Specific Heat Capacity | 500 J/kg·K | 20°C |
| Electrical Resistivity | 0.16 µΩ·m | 20°C |
| Magnetic Permeability | Ferromagnetic | Room temperature |
| Curie Temperature | 770°C | Magnetic transition |
| Thermal Diffusivity | 13.7×10-6 m²/s | 20°C |
| Emissivity | 0.85 | Oxidized surface |
📏 Product Specifications
| Specification | Available Options | Standards |
|---|---|---|
| Product Forms | Seamless Pipes, Welded Pipes, Plates, Coils | API 5L PSL1/PSL2 |
| Pipe Diameter Range | 168.3 - 1422 mm (6.625' - 56') | API 5L |
| Wall Thickness | 6.4 - 50.8 mm (0.25' - 2.0') | API 5L |
| Plate Thickness | 6 - 100 mm | ASTM A572 Gr.65 |
| Length Range | 5.8 - 18.3 m (Random/Fixed) | API 5L |
| End Finish | Plain End, Beveled End | API 5L |
| Surface Finish | Black, Varnished, 3PE Coated | API 5L |
| Dimensional Tolerance | ±1% (Diameter), ±12.5% (Wall) | API 5L PSL2 |
| Testing Requirements | Hydrostatic, NDT, Chemical Analysis | API 5L PSL2 |
| Certification | API 5L, ISO 3183, DNV-GL, PED | International Standards |
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Our Advantages in Processing API 5L X80
Advanced TMCP Manufacturing Technology
MetalZenith utilizes cutting-edge Thermomechanical Controlled Processing (TMCP) with precise temperature control and accelerated cooling systems. Our advanced rolling technology ensures optimal microstructure refinement, delivering consistent mechanical properties and superior toughness for demanding pipeline applications.
Comprehensive Quality Control Systems
Our state-of-the-art testing facilities include automated chemical analyzers, universal testing machines, and advanced NDT equipment. Every batch undergoes rigorous testing including Charpy V-notch impact testing at sub-zero temperatures, ensuring compliance with API 5L PSL2 requirements and customer specifications.
Custom Engineering & Global Supply
MetalZenith offers complete customization services including specialized heat treatments, custom dimensions, and application-specific modifications. Our global logistics network ensures timely delivery worldwide, supported by technical engineering services and comprehensive documentation for seamless project integration.
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