A572/S355JR Carbon Steel Plate: Technical Specifications & Industrial Applications
Material Classification & Standards
A572/S355JR carbon steel plates are high-strength low-alloy (HSLA) structural steels optimized for load-bearing efficiency and weldability45. The dual-standard designation covers:
- ASTM A572: Grades 42/50/60/65 (yield strength: 290–450 MPa)
- EN 10025-2 S355JR: Minimum yield strength 355 MPa7
Global Equivalents
| Region | Standard | Equivalent Grade |
|---|---|---|
| China | GB/T 1591 | Q355B |
| Europe | EN 10025-2 | S355JR |
| USA | ASTM A572 | Gr50/Gr60 |
Key Technical Parameters
1. Chemical Composition
| Element | A572Gr5045 | S355JR7 |
|---|---|---|
| C ≤ | 0.23% | 0.24% |
| Mn ≤ | 1.35% | 1.60% |
| Si ≤ | 0.40% | 0.55% |
| Nb+V | 0.05–0.15% | – |
2. Mechanical Properties
| Property | A572Gr505 | S355JR7 |
|---|---|---|
| Yield Strength | 345–470 MPa | ≥355 MPa |
| Tensile Strength | 490–600 MPa | 470–630 MPa |
| Elongation (A50) | 22–35% | ≥22% |
| Impact Energy | 45–150J @0℃ | 27J @20℃ |
Production & Processing
1. Manufacturing Methods
- Hot Rolling: Primary method for thickness >6mm (Rolling temperature: 1100–1250℃)
- Cold Rolling: For precision thin plates (Thickness: 0.1–3mm, tolerance ±0.05mm)
2. Surface Treatments
| Type | Technical Requirements | Application Scope |
|---|---|---|
| Hot-Dip Galvanizing | Zn coating 275g/m² (ASTM A123) | Outdoor structures12 |
| Shot Blasting | Sa2.5 cleanliness (ISO 8501-1) | Pre-paint preparation |
Industrial Applications
1. Structural Engineering
- Bridge Construction: A572Gr50 plates (Thickness 50mm) for Mississippi River crossings4
- High-Rise Buildings: S355JR H-beams (Dimensional tolerance ±2mm/10m)
2. Heavy Machinery
- Crane Booms: Gr60 steel (Tensile strength ≥550MPa)
- Mining Equipment: Abrasion-resistant variants with HB 400 hardness
3. Transportation
| Component | Material Specification | Performance Criteria |
|---|---|---|
| Truck Chassis | A572Gr50, 8–16mm thickness | Fatigue life ≥2×10⁶ cycles |
| Railway Wagons | S355JR cold-formed sections | -40℃ impact ≥34J |
Quality Control & Certification
- Mandatory Testing:
- Ultrasonic flaw detection (EN 10160 Class S2)
- Carbon equivalency ≤0.48% (CEV=C+Mn/6)
- Certifications:
- CE Marking (EN 10204-3.1)
- AWS D1.5 Bridge Welding Code
Delivery Specifications
- Dimensions:
- Width: 1,500–3,000mm (Can be customized up to 12m length)
- Thickness tolerance: ±0.1mm (Cold Rolling), ±1% (Hot Rolling)
- Packaging: VCI-coated + wooden pallets (Anti-rust period ≥ 12 months)
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