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Technical Specifications
Product Overview
Metallurgical Characteristics
GB Q235 is a low-carbon structural steel with a ferritic-pearlitic microstructure that provides excellent balance of strength, ductility, and weldability. The steel exhibits good cold forming properties and can be readily welded using conventional techniques without preheating requirements for most applications.
Heat Treatment Options
MetalZenith offers various heat treatment options including stress relieving at 550-650°C, normalizing at 850-950°C, and annealing at 680-720°C to optimize mechanical properties for specific applications. Our controlled atmosphere furnaces ensure consistent results and minimal surface oxidation.
Manufacturing Process
Our GB Q235 steel is produced through electric arc furnace melting followed by ladle refining for precise chemistry control. Continuous casting ensures homogeneous structure, while controlled rolling and cooling processes optimize grain size and mechanical properties. Advanced quality control includes real-time chemical analysis and comprehensive mechanical testing.
Quality Standards & Certifications
MetalZenith maintains strict adherence to GB/T 700 standards and ISO 9001:2015 quality management systems. All products undergo rigorous testing including chemical analysis, tensile testing, impact testing, and dimensional verification. Material test certificates and third-party inspection services are available upon request.
Welding & Fabrication Guidelines
GB Q235 exhibits excellent weldability with most common welding processes including SMAW, GMAW, GTAW, and SAW. Preheating is typically not required for sections up to 25mm thickness. Post-weld stress relief may be beneficial for critical applications or heavy sections to minimize residual stresses and improve dimensional stability.
🧪 Chemical Composition
| Element | Content (%) | Specification |
|---|---|---|
| Carbon (C) | ≤ 0.22 | GB/T 700 |
| Manganese (Mn) | 0.30 - 0.70 | GB/T 700 |
| Silicon (Si) | ≤ 0.35 | GB/T 700 |
| Phosphorus (P) | ≤ 0.045 | GB/T 700 |
| Sulfur (S) | ≤ 0.050 | GB/T 700 |
| Chromium (Cr) | ≤ 0.30 | Residual |
| Nickel (Ni) | ≤ 0.30 | Residual |
| Copper (Cu) | ≤ 0.25 | Residual |
⚙️ Mechanical Properties
| Property | Value | Test Standard |
|---|---|---|
| Tensile Strength | 375-500 MPa | GB/T 228.1 |
| Yield Strength | ≥ 235 MPa | GB/T 228.1 |
| Elongation (A50) | ≥ 26% | GB/T 228.1 |
| Elongation (A80) | ≥ 23% | GB/T 228.1 |
| Brinell Hardness (HB) | 105-140 | GB/T 231.1 |
| Impact Energy (KV2, 20°C) | ≥ 27 J | GB/T 229 |
| Young's Modulus | 200-210 GPa | ASTM E111 |
| Fatigue Limit (10^7 cycles) | 180-200 MPa | GB/T 4337 |
🔬 Physical Properties
| Property | Value | Temperature/Condition |
|---|---|---|
| Density | 7.85 g/cm³ | 20°C |
| Melting Point | 1510°C | Solidus |
| 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 |
📏 Product Specifications
| Specification | Available Options | Standards |
|---|---|---|
| Product Forms | Plates, Sheets, Bars, Beams, Channels, Angles, Tubes, Pipes | GB/T 700, GB/T 3274 |
| Plate Thickness | 6-200 mm | GB/T 3274 |
| Sheet Thickness | 0.5-6 mm | GB/T 912 |
| Bar Diameter | 6-300 mm | GB/T 702 |
| Tube Outer Diameter | 10-600 mm | GB/T 8162 |
| Surface Finish | Hot Rolled, Cold Rolled, Pickled, Galvanized | GB/T 3274, GB/T 2518 |
| Dimensional Tolerance | ±0.1-0.5 mm (thickness dependent) | GB/T 709 |
| Length Options | Standard: 6m, 9m, 12m; Custom lengths available | Customer Specification |
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Our Advantages in Processing GB Q235
Advanced Electric Arc Furnace Technology
MetalZenith employs cutting-edge electric arc furnace technology with precise temperature control and automated charging systems, ensuring optimal chemical composition consistency and minimal impurity content in every heat of GB Q235 steel production.
Comprehensive Quality Control System
Our integrated quality management system features real-time chemical analysis, automated mechanical testing, and advanced non-destructive examination capabilities, guaranteeing that every GB Q235 product meets or exceeds international standards with full traceability documentation.
Flexible Customization & Global Supply
MetalZenith offers extensive customization options for GB Q235 steel including various forms, dimensions, and surface treatments, supported by our global logistics network and strategic warehouse locations for efficient worldwide delivery and technical support.
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