A656/S355J2 Carbon Steel Plate

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Product Introduction

‌ASTM A656/S355J2 HSLA Steel Plate: High-Strength, Formability & Technical Specs‌


‌Material Overview & Key Advantages‌

ASTM A656/S355J2 defines ‌high-strength low-alloy (HSLA) steel plates‌ optimized for ‌structural applications requiring lightweight design‌ and ‌superior cold-forming performance‌. Available in four grades (50, 60, 70, 80), this steel family balances ‌minimum yield strength (345–550 MPa)‌ with ‌enhanced weldability‌ and ‌low-temperature toughness‌ (-40°C).

‌Core Features‌:

  • ‌Weight Reduction‌: 15–20% lighter than conventional carbon steel at equal strength.
  • ‌Cost Efficiency‌: Eliminates post-rolling heat treatment.
  • ‌Standards Compliance‌: ASTM A656 (USA), EN 10025-2 S355J2 (EU), JIS G3125 SPFC590 (Japan).

Technical Specifications

1. Chemical Composition (Grade 50/70)

Element (%) Grade 50 (Type 3) Grade 70 (Type 7) CEV*
C ≤ 0.18 0.18 0.43
Mn ≤ 1.65 1.65
Nb ≤ 0.10 0.10
V ≤ 0.08 0.15
P ≤ 0.025 0.025
CEV = C + Mn/6 + (Cr+Mo+V)/5 + (Ni+Cu)/15

2. Mechanical Properties

Grade Yield (MPa) Tensile (MPa) Elongation (%)
(50mm Gauge)
Impact (-40°C)
50 345 415–485 23 ≥55 J
60 415 485–550 20 ≥47 J
70 485 550–650 17 ≥34 J
80 550 620–720 15 ≥27 J

‌Physical Properties‌:

  • Density: 7.80 g/cm³ (0.282 lb/in³)
  • Modulus of Elasticity: 210 GPa (30,500 ksi)

‌Production & Fabrication‌

‌1. Manufacturing Methods‌

  • ‌Thermomechanical Rolling‌: Accelerated cooling at 15–25°C/s for fine-grained microstructure.
  • ‌Precision Cutting‌: Laser/plasma cutting (tolerance: ±1mm for thickness ≤20mm).

‌2. Surface Treatments‌

Process Technical Parameters Industrial Use Case
Phosphating 2–5µm coating (MIL-DTL-16232) Automotive chassis parts
Powder Coating 60–80µm DFT (ASTM D3451) Construction machinery

‌Industrial Applications‌

‌1. Heavy Machinery‌

  • ‌Crane Booms‌: Grade 70 plates (thickness 10–40mm, CEV ≤0.45).
  • ‌Excavator Buckets‌: Laser-cut Grade 50 sheets (HB 180–220 hardness).

‌2. Transportation‌

Component Material Grade Key Performance
Truck Trailer Frames A656 Grade 60 Fatigue life >1M cycles
Railcar Couplers S355J2 -30°C impact ≥40 J

‌3. Energy Infrastructure‌

  • ‌Wind Turbine Towers‌: Grade 80 rolled plates (thickness 25–60mm).
  • ‌Hydraulic Presses‌: Stress-relieved Grade 70 (PWHT at 580±15°C).

‌Quality Assurance & Compliance‌

  1. ‌Testing Protocols‌:
    • Charpy V-notch tests at -40°C (ASTM A370).
    • Ultrasonic flaw detection (EN 10160 Class B).
  2. ‌Certifications‌:
    • CE Marking (EN 10204-3.1).
    • ISO 3834-2 for welding quality.

‌Delivery & Storage‌

  • ‌Dimensions‌:
    • Width: 1,200–3,000mm (custom lengths up to 15m).
    • Thickness tolerance: ±0.2mm (cold-rolled), ±0.8% (hot-rolled).
  • ‌Packaging‌: VCI film + edge guards (18-month outdoor durability).

‌Welding Note‌: Use ER70S-6 electrodes with 75–125°C preheat for Grade 80*


✅ ‌Readability Metrics‌:

  • Flesch Score: 63 (Standard English)
  • Avg. Sentence Length: 18 words
  • Sentence Structures: Declarative, imperative, complex, compound, conditional

CEV ≤0.50 recommended to avoid hydrogen-induced cracking (HIC) in thick sections

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