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Technical Specifications
Product Overview
Metallurgical Characteristics
EN P355GH is a fine-grained pressure vessel steel with a ferritic-pearlitic microstructure optimized for elevated temperature service up to 400°C. The steel achieves its superior properties through controlled rolling and accelerated cooling, resulting in refined grain size and improved impact toughness. The aluminum content ensures effective grain refinement, while the controlled carbon equivalent maintains excellent weldability.
Heat Treatment Process
MetalZenith employs precise heat treatment protocols including normalizing at 900-950°C followed by air cooling. Optional tempering at 600-650°C can be applied to optimize stress relief and dimensional stability. Our computer-controlled furnaces ensure uniform heating and precise temperature control throughout the entire cross-section, guaranteeing consistent mechanical properties.
Manufacturing Process Excellence
Our manufacturing process begins with electric arc furnace melting using premium scrap and alloy additions. Secondary refining through ladle metallurgy ensures precise chemistry control and inclusion modification. Continuous casting produces high-quality billets, which undergo controlled rolling in our state-of-the-art plate mill with accelerated cooling capability to achieve optimal microstructure development.
Quality Standards & Compliance
EN P355GH production at MetalZenith complies with EN 10028-2:2017 specifications and PED 2014/68/EU requirements. Our quality management system includes 100% ultrasonic testing, complete chemical analysis, mechanical testing at room and elevated temperatures, and Charpy V-notch impact testing. All products are supplied with EN 10204 Type 3.1 certificates and full traceability documentation.
Welding & Fabrication Guidelines
The steel exhibits excellent weldability with carbon equivalent (CEV) typically below 0.42%. Preheating is generally not required for sections up to 25mm thickness. Post-weld heat treatment at 580-620°C is recommended for pressure vessel applications to ensure stress relief and optimal service performance. Compatible welding consumables include AWS E7018 and similar low-hydrogen electrodes.
🧪 Chemical Composition
| Element | Composition (%) | Specification |
|---|---|---|
| Carbon (C) | ≤ 0.20 | EN 10028-2 |
| Manganese (Mn) | 1.00 - 1.70 | EN 10028-2 |
| Silicon (Si) | ≤ 0.55 | EN 10028-2 |
| Phosphorus (P) | ≤ 0.025 | EN 10028-2 |
| Sulfur (S) | ≤ 0.015 | EN 10028-2 |
| Chromium (Cr) | ≤ 0.30 | EN 10028-2 |
| Nickel (Ni) | ≤ 0.30 | EN 10028-2 |
| Molybdenum (Mo) | ≤ 0.08 | EN 10028-2 |
| Copper (Cu) | ≤ 0.30 | EN 10028-2 |
| Aluminum (Al) | ≥ 0.020 | EN 10028-2 |
| Nitrogen (N) | ≤ 0.012 | EN 10028-2 |
| Niobium (Nb) | ≤ 0.05 | EN 10028-2 |
⚙️ Mechanical Properties
| Property | Value | Test Condition |
|---|---|---|
| Yield Strength (Rp0.2) | 355-460 MPa | Room Temperature |
| Tensile Strength (Rm) | 490-630 MPa | Room Temperature |
| Elongation (A5) | ≥ 22% | Room Temperature |
| Impact Energy (KV) | ≥ 27 J | 20°C |
| Impact Energy (KV) | ≥ 27 J | 0°C |
| Hardness (HB) | 150-200 HB | Brinell Scale |
| Young's Modulus | 210 GPa | Room Temperature |
| Poisson's Ratio | 0.30 | Room Temperature |
| Fatigue Limit | 245 MPa | 10&sup7; cycles |
| Fracture Toughness | 150-200 MPa·m¹/² | Room Temperature |
🔬 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 Conductivity | 42 W/m·K | 400°C |
| Thermal Expansion Coefficient | 12×10-6/K | 20-100°C |
| Thermal Expansion Coefficient | 13.5×10-6/K | 20-400°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 | - |
📏 Product Specifications
| Specification | Available Options | Standards |
|---|---|---|
| Product Forms | Plates, Sheets, Bars, Forgings, Tubes | EN 10028-2 |
| Plate Thickness | 6-200 mm | EN 10028-2 |
| Plate Width | 1000-4000 mm | EN 10028-2 |
| Plate Length | 2000-12000 mm | EN 10028-2 |
| Bar Diameter | 10-300 mm | EN 10028-2 |
| Surface Finish | Hot Rolled, Normalized, Shot Blasted | EN 10028-2 |
| Thickness Tolerance | ±0.3-1.0 mm | EN 10029 |
| Width Tolerance | ±5-10 mm | EN 10029 |
| Length Tolerance | ±10-25 mm | EN 10029 |
| Heat Treatment | Normalized, Normalized + Tempered | EN 10028-2 |
| Testing Standards | EN 10028-2, ASME SA-516, JIS G3103 | International |
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Our Advantages in Processing EN P355GH
Advanced Thermomechanical Processing
MetalZenith employs cutting-edge controlled rolling and accelerated cooling technology to achieve optimal grain refinement in EN P355GH steel, resulting in superior mechanical properties and enhanced impact toughness at elevated temperatures.
Comprehensive Quality Control System
Our state-of-the-art testing facility conducts 100% ultrasonic inspection, Charpy V-notch impact testing at multiple temperatures, and complete chemical analysis using advanced spectrometry to ensure every plate meets stringent EN 10028-2 requirements.
Custom Processing & Global Supply
MetalZenith offers extensive customization including precision cutting, heat treatment optimization, and surface finishing. Our global distribution network ensures reliable delivery of EN P355GH steel in various forms with full certification documentation worldwide.
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