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Technical Specifications
Product Overview
Metallurgical Characteristics
GB 15CrMoR is a low-alloy chromium-molybdenum steel specifically engineered for pressure vessel applications operating at elevated temperatures up to 475°C. The controlled addition of chromium (0.80-1.20%) and molybdenum (0.45-0.65%) creates a fine-grained ferritic-pearlitic microstructure with excellent creep resistance and hydrogen attack resistance. The chromium content provides enhanced oxidation resistance, while molybdenum contributes to solid solution strengthening and improved high-temperature mechanical properties.
Heat Treatment Process
MetalZenith employs a precise heat treatment protocol consisting of normalizing at 900-950°C followed by tempering at 650-700°C. This thermal processing sequence refines the grain structure, optimizes carbide distribution, and relieves residual stresses. The controlled cooling rate during normalizing ensures uniform transformation, while tempering temperature is carefully selected to achieve the optimal balance between strength and toughness. Post-weld heat treatment at 680-720°C is recommended for welded components.
Manufacturing Process
Production begins with electric arc furnace melting using high-purity raw materials, followed by ladle refining and vacuum degassing to achieve ultra-low sulfur and phosphorus levels. Continuous casting produces high-quality billets with minimal segregation. Hot rolling is performed with controlled temperature and reduction schedules to optimize grain refinement. Advanced ultrasonic testing ensures internal soundness, while dimensional accuracy is maintained through precision finishing operations.
Quality Standards & Compliance
GB 15CrMoR steel manufactured by MetalZenith complies with GB 713 Chinese national standard, ASME SA-387 Grade 11, and EN 10028-2 P11 specifications. Quality assurance includes 100% chemical analysis verification, mechanical property testing per batch, ultrasonic inspection for internal defects, and metallographic examination. All products are supplied with mill test certificates (MTC 3.1) and can be third-party certified. PED compliance ensures suitability for European pressure equipment applications.
🧪 Chemical Composition
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.12-0.18 |
| Manganese (Mn) | 0.40-0.70 |
| Silicon (Si) | 0.17-0.37 |
| Phosphorus (P) | ≤ 0.025 |
| Sulfur (S) | ≤ 0.015 |
| Chromium (Cr) | 0.80-1.20 |
| Molybdenum (Mo) | 0.45-0.65 |
| Nickel (Ni) | ≤ 0.30 |
| Copper (Cu) | ≤ 0.20 |
| Aluminum (Al) | ≥ 0.020 |
| Vanadium (V) | ≤ 0.02 |
| Titanium (Ti) | ≤ 0.03 |
⚙️ Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength (Rm) | 440-590 MPa |
| Yield Strength (Rp0.2) | ≥ 295 MPa |
| Elongation (A) | ≥ 22% |
| Reduction of Area (Z) | ≥ 50% |
| Brinell Hardness (HB) | 131-187 |
| Impact Energy (KV2) at 20°C | ≥ 34 J |
| Impact Energy (KV2) at 0°C | ≥ 27 J |
| Impact Energy (KV2) at -20°C | ≥ 20 J |
| Young's Modulus (E) | 210 GPa |
| Poisson's Ratio (ν) | 0.30 |
| Fatigue Limit (107 cycles) | 200 MPa |
| Fracture Toughness (KIC) | 80-120 MPa·m1/2 |
🔬 Physical Properties
| Property | Value |
|---|---|
| Density | 7.85 g/cm³ |
| Melting Point | 1480-1520°C |
| Thermal Conductivity (20°C) | 42 W/m·K |
| Thermal Conductivity (100°C) | 40 W/m·K |
| Thermal Conductivity (200°C) | 38 W/m·K |
| Thermal Expansion (20-100°C) | 11.5×10-6/K |
| Thermal Expansion (20-200°C) | 12.0×10-6/K |
| Thermal Expansion (20-400°C) | 12.8×10-6/K |
| Specific Heat Capacity (20°C) | 460 J/kg·K |
| Electrical Resistivity (20°C) | 0.25 µΩ·m |
| Magnetic Permeability | Ferromagnetic |
| Curie Temperature | 770°C |
📏 Product Specifications
| Specification | Available Options |
|---|---|
| Product Forms | Plates, Sheets, Bars, Forgings, Tubes, Pipes |
| Plate Thickness | 6-200 mm |
| Sheet Thickness | 0.5-6 mm |
| Bar Diameter | 10-300 mm |
| Tube Outer Diameter | 15-600 mm |
| Wall Thickness (Tubes) | 2-50 mm |
| Standard Dimensions | GB 713, ASME SA-387, EN 10028-2 |
| Surface Finish | Hot Rolled, Normalized, Pickled, Ground |
| Dimensional Tolerance | ±0.1-0.5 mm (depending on form) |
| Length Range | 1000-12000 mm |
| Width Range | 1000-4000 mm |
| Edge Condition | Mill Edge, Slit Edge, Sheared Edge |
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Our Advantages in Processing GB 15CrMoR
Advanced Metallurgical Control
MetalZenith utilizes cutting-edge vacuum degassing and ladle refining technology to achieve precise chemical composition control and exceptional cleanliness in GB 15CrMoR steel. Our proprietary alloying techniques ensure optimal chromium and molybdenum distribution for enhanced high-temperature strength and hydrogen attack resistance.
Comprehensive Quality Testing
Our state-of-the-art testing facility conducts full mechanical property verification, ultrasonic inspection, and metallographic analysis on every GB 15CrMoR batch. Advanced impact testing at various temperatures ensures reliable performance in critical pressure vessel applications with complete material traceability and certification.
Custom Processing & Global Supply
MetalZenith offers extensive customization capabilities including precision machining, heat treatment optimization, and specialized surface finishes for GB 15CrMoR steel. Our global logistics network ensures timely delivery worldwide, supported by technical engineering services and application-specific material recommendations.
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