A656/S355J2 Carbon Steel Coil

ASTM A656/S355J2 carbon steel coil is a ‌high-strength low-alloy (HSLA) steel‌ compliant with ‌ASTM A656‌, ‌EN 10025-2 S355J2‌, and ‌JIS G3135 SPFH590‌. Designed for crane booms, truck frames, and construction machinery, this steel delivers ‌345–690 MPa yield strength‌ and ‌12–23% elongation‌ while reducing structural weight by ‌15–25%‌ compared to traditional steels like A36. Available in Grades 50, 60, 70, and 80, it combines ‌hot/cold rolling precision‌ with excellent low-temperature toughness (-50°C).
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Product Introduction

‌ASTM A656/S355J2 Carbon Steel Coil: High-Strength Structural Steel for Lightweight Applications‌


‌Product Overview‌

ASTM A656/S355J2 carbon steel coil is a ‌high-strength low-alloy (HSLA) steel‌ compliant with ‌ASTM A656‌, ‌EN 10025-2 S355J2‌, and ‌JIS G3135 SPFH590‌. Designed for crane booms, truck frames, and construction machinery, this steel delivers ‌345–690 MPa yield strength‌ and ‌12–23% elongation‌ while reducing structural weight by ‌15–25%‌ compared to traditional steels like A36. Available in Grades 50, 60, 70, and 80, it combines ‌hot/cold rolling precision‌ with excellent low-temperature toughness (-50°C).


‌Key Technical Specifications‌

‌1. Production & Dimensions‌

  • ‌Process‌:
    • Hot-rolled: 2.75–100mm thickness (±1% tolerance)
    • Cold-rolled: 0.2–3mm thickness (±0.3% tolerance)
  • ‌Width‌: 45–2,200mm (optimized for robotic welding systems)
  • ‌Surface‌: Mill scale (Ra 8.3µm), wire-drawn (Ra 2.5µm), or laminated film (anti-scratch)

‌2. Chemical Composition‌

Grade C (≤) Mn (≤) Si (≤) V Nb CEV (IIW)
50 0.18% 1.65% 0.60% 0.08% 0.008–0.10% 0.37
70 0.18% 1.65% 0.60% 0.15% 0.10% 0.45

Trace elements: P ≤0.025%, S ≤0.035%, N ≤0.020%


‌Mechanical Properties‌

Grade Yield Strength (MPa) Tensile Strength (MPa) Elongation (%) Impact Toughness (-50°C)
50 345 415–550 18 (200mm) 34J
60 415 485–650 17 (200mm) 28J
70 485 550–700 14 (200mm) 22J
80 550 620–750 12 (200mm) 18J

Tested per ASTM A370 (transverse specimens)


‌Performance Advantages‌

  1. ‌Strength-to-Weight Optimization‌:
    • ‌25% weight reduction‌ vs. A572 steel in crane boom designs (Grade 70, 10mm thickness).
    • Bend radius: ‌2.5× thickness‌ (ASTM A6/A6M compliant).
  2. ‌Weldability & Fabrication‌:
    • ‌Carbon Equivalent (CEV)‌: 0.37–0.45 (IIW formula) minimizes preheating below 25mm.
    • Recommended welding: GMAW (ER70S-3 wire) or laser welding for thin sheets.
  3. ‌Low-Temperature Performance‌:
    • ‌Charpy V-notch impact‌: 22J at -50°C (Grade 70, 20mm thickness).
    • Ideal for Arctic mining equipment and cold-storage facilities.
  4. ‌Corrosion Resistance‌:
    • Atmospheric corrosion rate: ‌0.055 mm/year‌ (ISO 9223 C3 environments).
    • Compatible with epoxy coatings (DFT 120µm).

‌Applications by Grade‌

Grade Industry Use Case
‌50‌ Automotive Truck chassis, trailer frames
‌60‌ Logistics Container handling cranes
‌70‌ Energy Hydraulic turbine components
‌80‌ Defense Military vehicle armor plates

‌Global Equivalents‌

ASTM A656 EN 10025 JIS G3135 GB/T 1591
Grade 50 S355J2 SPFH590 Q345D
Grade 70 S460ML SPFH690 Q460E

‌Sustainability & Compliance‌

  • ‌Recycled Content‌: 82% (mill-certified)
  • ‌RoHS Compliance‌: Lead <0.01%, Cadmium-free
  • ‌CE Marking‌: EN 1090-1 (Execution Class 2)

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Luo Kaiwei Steel Company is a comprehensive steel supplier that produces a variety of carbon steel plates, carbon steel pipes, galvanized steel, carbon steel coils, and steel profiles.

Luo Kaiwei Steel Company is a multi-ISO certified steel manufacturer specializing in carbon steel plates, pipes and galvanized coils since 2010. Competitive prices and ASTM/JIS compliant. Get instant quotes for bulk orders and global shipping support.

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