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Technical Specifications
Product Overview
Metallurgical Characteristics
API 5L X42 is a high-strength low-alloy (HSLA) steel with a predominantly ferritic-pearlitic microstructure. The controlled rolling process employed by MetalZenith refines the grain structure through thermomechanical controlled processing (TMCP), resulting in enhanced strength and toughness. Microalloying elements such as niobium and vanadium provide precipitation strengthening and grain refinement.
Heat Treatment Process
MetalZenith utilizes advanced controlled cooling techniques following hot rolling to achieve optimal mechanical properties. The steel undergoes normalizing treatment at 900-950°C followed by accelerated cooling to room temperature. This process ensures uniform microstructure distribution and eliminates residual stresses while maintaining excellent weldability characteristics.
Manufacturing Process
Our integrated steel production facility employs electric arc furnace melting with secondary refining through ladle metallurgy and vacuum degassing. Continuous casting produces high-quality billets with minimal segregation. Hot rolling is performed using computer-controlled rolling mills with precise temperature and deformation control to achieve the required mechanical properties and dimensional accuracy.
Quality Standards & Testing
All API 5L X42 products manufactured by MetalZenith comply with international standards including API 5L PSL1/PSL2, ASTM A106, and ISO 3183. Comprehensive testing includes chemical analysis using optical emission spectroscopy, mechanical testing per ASTM A370, ultrasonic testing for internal defects, and hydrostatic testing for pressure integrity. Non-destructive testing capabilities include radiographic, magnetic particle, and dye penetrant inspection.
Welding Considerations
API 5L X42 exhibits excellent weldability with low carbon equivalent (CE ≤ 0.43%). Preheating is typically not required for wall thicknesses up to 25mm. Post-weld heat treatment may be specified for stress relief in critical applications. MetalZenith provides detailed welding procedure specifications (WPS) and qualified welding procedures for optimal joint performance.
🧪 Chemical Composition
| Element | Composition (%) | Specification |
|---|---|---|
| Carbon (C) | ≤ 0.26 | API 5L |
| Manganese (Mn) | 0.80 - 1.40 | API 5L |
| Silicon (Si) | 0.15 - 0.40 | API 5L |
| Phosphorus (P) | ≤ 0.025 | API 5L |
| Sulfur (S) | ≤ 0.015 | API 5L |
| Chromium (Cr) | ≤ 0.30 | Optional |
| Nickel (Ni) | ≤ 0.30 | Optional |
| Molybdenum (Mo) | ≤ 0.15 | Optional |
| Copper (Cu) | ≤ 0.35 | Optional |
| Aluminum (Al) | 0.020 - 0.055 | Deoxidizer |
| Niobium (Nb) | ≤ 0.05 | Microalloying |
| Vanadium (V) | ≤ 0.06 | Microalloying |
⚙️ Mechanical Properties
| Property | Value | Test Standard |
|---|---|---|
| Yield Strength (Rp0.2) | 290 - 440 MPa | ASTM A370 |
| Tensile Strength (Rm) | 415 - 565 MPa | ASTM A370 |
| Elongation (A) | ≥ 22% | ASTM A370 |
| Hardness (HB) | 125 - 170 | ASTM E10 |
| Impact Energy (CVN at 0°C) | ≥ 27 J | ASTM A370 |
| Impact Energy (CVN at -20°C) | ≥ 20 J | ASTM A370 |
| Young's Modulus | 210 GPa | ASTM E111 |
| Poisson's Ratio | 0.30 | ASTM E132 |
| Fatigue Limit (10^7 cycles) | 180 MPa | ASTM D7791 |
| Fracture Toughness (KIC) | 120 MPa·m^0.5 | ASTM E399 |
🔬 Physical Properties
| Property | Value | Temperature |
|---|---|---|
| Density | 7.85 g/cm³ | 20°C |
| Melting Point | 1510°C | - |
| 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 | 20°C |
| Curie Temperature | 770°C | - |
| Thermal Diffusivity | 13.8×10-6 m²/s | 20°C |
| Emissivity | 0.85 | 600°C |
📏 Product Specifications
| Specification | Available Options | Standards |
|---|---|---|
| Product Forms | Seamless Pipes, Welded Pipes, Plates, Sheets, Bars, Forgings | API 5L, ASTM A106 |
| Pipe Diameter Range | 6mm - 1422mm (0.25' - 56') | API 5L |
| Wall Thickness | 2mm - 80mm | API 5L |
| Plate Thickness | 6mm - 200mm | ASTM A516 |
| Length | 6m - 18m (Random/Fixed) | API 5L |
| Surface Finish | Black, Pickled, Oiled, Galvanized, Epoxy Coated | NACE MR0175 |
| End Preparation | Plain End, Beveled End, Threaded | API 5L |
| Dimensional Tolerance | ±1% (Diameter), ±12.5% (Wall Thickness) | API 5L |
| Testing Requirements | Hydrostatic, UT, RT, MT, Chemical Analysis | API 5L |
| Certification | Mill Test Certificate, Third Party Inspection | EN 10204 3.1/3.2 |
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Our Advantages in Processing API 5L X42
Advanced Thermomechanical Processing
MetalZenith employs cutting-edge controlled rolling and accelerated cooling technology to achieve optimal grain refinement and precipitation hardening in API 5L X42 steel, resulting in superior mechanical properties and enhanced toughness at low temperatures.
Comprehensive Quality Control System
Our integrated quality management system includes real-time chemical composition monitoring, automated ultrasonic testing, and statistical process control to ensure every batch of API 5L X42 meets or exceeds international specifications with zero-defect manufacturing standards.
Custom Engineering & Global Supply
MetalZenith offers complete customization services including specific dimensional requirements, special heat treatments, and value-added processing. Our global distribution network ensures timely delivery with full traceability and technical support throughout the project lifecycle.
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