A572/S355JR Carbon Steel Plate

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

  1. Mandatory Testing‌:
    • Ultrasonic flaw detection (EN 10160 Class S2)
    • Carbon equivalency ≤0.48% (CEV=C+Mn/6)‌
  2. 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)

Product Show

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