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Technical Specifications
Product Overview
Metallurgical Characteristics
GB L485 is a high-strength low-alloy (HSLA) steel featuring a fine-grained ferrite-pearlite microstructure with controlled precipitation strengthening. The steel achieves its superior mechanical properties through microalloying with niobium, vanadium, and titanium, which form fine carbides and nitrides that provide grain refinement and precipitation hardening. The optimized chemical composition ensures excellent weldability while maintaining high strength and toughness characteristics essential for pipeline applications.
Advanced Manufacturing Process
MetalZenith employs state-of-the-art Thermo-Mechanical Controlled Processing (TMCP) technology for GB L485 production. The process begins with electric arc furnace melting followed by ladle refining for precise chemical composition control. Continuous casting produces high-quality billets with minimal segregation. The controlled rolling process involves reheating to 1200-1250°C, followed by multi-pass rolling with finish rolling temperatures of 780-850°C. Accelerated cooling (ACC) at rates of 5-30°C/s achieves the desired microstructure and mechanical properties without conventional heat treatment.
Heat Treatment & Processing
GB L485 steel is typically supplied in the as-rolled condition after TMCP, eliminating the need for additional heat treatment. For specific applications requiring stress relief, the material can be subjected to controlled heating at 580-620°C. Welding procedures require preheating to 100-150°C for thick sections, with interpass temperatures maintained below 250°C. Post-weld heat treatment is generally not required due to the steel's excellent weldability characteristics and low carbon equivalent.
Quality Standards & Testing
MetalZenith's GB L485 steel production adheres to stringent quality standards including GB/T 9711, API 5L PSL2, and ISO 3183 requirements. Comprehensive testing protocols include chemical analysis using optical emission spectrometry, mechanical testing with universal testing machines, Charpy impact testing at specified temperatures, and non-destructive testing including ultrasonic inspection and magnetic particle testing. Hydrostatic testing ensures pressure integrity, while dimensional inspection verifies compliance with specified tolerances. All products are supplied with complete material traceability documentation and mill test certificates confirming compliance with applicable standards.
🧪 Chemical Composition
| Element | Composition (%) |
|---|---|
| Carbon (C) | ≤ 0.12 |
| Manganese (Mn) | 1.40 - 1.70 |
| Silicon (Si) | 0.15 - 0.45 |
| Phosphorus (P) | ≤ 0.020 |
| Sulfur (S) | ≤ 0.010 |
| Chromium (Cr) | ≤ 0.30 |
| Nickel (Ni) | ≤ 0.30 |
| Molybdenum (Mo) | ≤ 0.15 |
| Copper (Cu) | ≤ 0.35 |
| Niobium (Nb) | 0.02 - 0.08 |
| Vanadium (V) | ≤ 0.06 |
| Titanium (Ti) | ≤ 0.04 |
| Aluminum (Al) | ≥ 0.015 |
| Nitrogen (N) | ≤ 0.012 |
| Carbon Equivalent (CE) | ≤ 0.43 |
⚙️ Mechanical Properties
| Property | Value |
|---|---|
| Yield Strength (Rp0.2) | 485 - 635 MPa |
| Tensile Strength (Rm) | 570 - 760 MPa |
| Elongation (A) | ≥ 18% |
| Yield to Tensile Ratio | ≤ 0.85 |
| Impact Energy (Charpy V-notch at 0°C) | ≥ 41 J |
| Impact Energy (Charpy V-notch at -20°C) | ≥ 27 J |
| Hardness (HV10) | 200 - 280 |
| Young's Modulus | 210 GPa |
| Poisson's Ratio | 0.30 |
| Fatigue Limit (107 cycles) | 240 MPa |
| Fracture Toughness (KIC) | 150 - 200 MPa·m1/2 |
| Reduction of Area | ≥ 60% |
🔬 Physical Properties
| Property | Value |
|---|---|
| Density | 7.85 g/cm³ |
| Melting Point | 1510°C |
| Thermal Conductivity (at 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 (at 20°C) | 0.16 µΩ·m |
| Magnetic Permeability | Ferromagnetic |
| Curie Temperature | 770°C |
| Thermal Diffusivity | 13.7×10-6 m²/s |
| Emissivity (oxidized surface) | 0.85 |
| Sound Velocity (longitudinal) | 5900 m/s |
| Coefficient of Linear Expansion (0-100°C) | 11.5×10-6/K |
📏 Product Specifications
| Specification | Available Options |
|---|---|
| Product Forms | Seamless Pipes, Welded Pipes, Plates, Sheets, Bars, Forgings |
| Pipe Outer Diameter | 21.3 - 1422 mm |
| Wall Thickness | 2.0 - 80.0 mm |
| Plate Thickness | 6 - 150 mm |
| Plate Width | 1500 - 4000 mm |
| Length | 6 - 18 m (or as required) |
| Standards Compliance | GB/T 9711, API 5L, ASTM A106, EN 10208, ISO 3183 |
| Surface Finish | Black, Pickled, Oiled, Galvanized, Epoxy Coated |
| End Preparation | Plain End, Beveled End, Threaded, Flanged |
| Dimensional Tolerance | ±0.5% (thickness), ±1.0% (diameter) |
| Testing Requirements | Hydrostatic Test, NDT, Chemical Analysis, Mechanical Testing |
| Certification | Mill Test Certificate, Third Party Inspection, Material Traceability |
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Our Advantages in Processing GB L485
Advanced TMCP Processing Technology
MetalZenith employs cutting-edge Thermo-Mechanical Controlled Processing (TMCP) technology with precise temperature control and accelerated cooling systems. This advanced manufacturing process optimizes grain refinement and precipitation strengthening, delivering GB L485 steel with superior mechanical properties, enhanced toughness, and excellent weldability for demanding pipeline applications.
Comprehensive Quality Control Systems
Our integrated quality assurance program features real-time chemical analysis using advanced spectrometers, automated mechanical testing systems, and comprehensive non-destructive testing capabilities including ultrasonic and magnetic particle inspection. Every batch of GB L485 steel undergoes rigorous testing protocols with full material traceability and certification documentation.
Global Supply Chain Excellence
MetalZenith offers flexible customization capabilities for GB L485 steel including various product forms, dimensions, and surface finishes. Our global logistics network ensures reliable delivery worldwide, supported by strategic inventory management and just-in-time delivery services. We provide comprehensive technical support and engineering consultation for project-specific requirements.
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