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S355J2 High Strength Structural Steel Machining
When structural projects demand higher load-bearing capacity and reliability in cold environments, S355J2 is the European standard of choice. As a non-alloy structural steel, it offers a minimum yield strength of 355 MPa—significantly higher than standard S235—combined with guaranteed impact toughness at -20°C. At JUCHENG, we specialize in processing heavy S355J2 plates and profiles for the most demanding sectors. From machining massive crane outriggers to fabricating offshore platform nodes, we ensure that every component retains its mechanical integrity through precise cutting, milling, and welding processes.
S355J2 Structural Steel

JUCHENG's S355J2 Fabrication Capabilities

Processing high-strength structural steel requires heavy-duty equipment. We offer:
  • Heavy Plate Machining: We utilize large-format CNC mills to process thick S355J2 plates (up to 200mm+), facing and boring critical connection points for heavy machinery.
  • Weld Preparation: Since S355J2 is designed for welded structures, we provide precision CNC chamfering and beveling to ensure perfect weld penetration and joint strength.
  • Cold Forming: Despite its strength, S355J2 has good ductility. We can press-brake form thick brackets and channels without cracking.
  • Surface Treatment: We offer shot blasting to remove hot-rolled mill scale, followed by Marine Grade Painting or Hot Dip Galvanizing for corrosion protection in harsh environments.
CNC machined S355J2 steel

Advantages of CNC Machining S355J2

Advantage Detailed Description Key Benefit
High Yield Strength Minimum yield of 355 MPa (vs 235 MPa for S235). Allows for the use of thinner sections to carry the same load, reducing overall structure weight.
Low Temp Toughness "J2" designation ensures impact energy of 27J at -20°C. Critical for equipment operating in freezing climates or offshore environments to prevent brittle fracture.
Excellent Weldability Low carbon equivalent ensures good weldability without pre-heating (for standard thicknesses). Ideal for fabricating large, complex frames and chassis.
Good Machinability Machines well with high-speed steel or carbide tools. Cost-effective production of large flanges and baseplates.
Availability Widely available in diverse profiles (beams, plates, tubes). flexible design options for structural engineers.

Technical Parameters & Material Standards

Understanding the specific designation helps in selecting the right grade:
Grade Category Specification (EN 10025) Characteristics & Ideal Uses
S355J2 (+N) 1.0577 Characteristics: Normalized condition (+N) is preferred for uniform properties. Excellent tensile strength and notch toughness at low temperatures.
Uses: Crane booms, excavator chassis, wind tower flanges, offshore structures.
S355K2 1.0596 Characteristics: Even higher impact requirement (40J at -20°C). Used for critical fracture-critical components.
Uses: Highly stressed mining equipment, safety-critical structural joints.

CNC Machining Guidelines for S355J2

  • Scale Removal: Like all hot-rolled steels, S355J2 has a hard oxide scale. We perform "skin cuts" with tough carbide inserts to expose the clean metal beneath before finish machining.
  • Stress Relief: Heavy machining on one side of a high-strength plate can cause bowing. We recommend stress-relief heat treatment for large precision parts.
  • Tapping: Tapping holes in S355J2 requires high torque. We use spiral point taps and high-pressure oil to ensure clean threads.
  • Flame Cutting vs. Milling: For complex contours in thick plates, we often flame-cut or plasma-cut the profile first, then CNC mill the precision features to save costs.

Application Scenarios

  • Yellow Goods (Heavy Machinery): Excavator arms, bulldozer blades, dump truck bodies.
  • Offshore & Marine: Oil rig platforms, ship deck equipment, subsea pipe supports.
  • Lifting Equipment: Mobile crane outriggers, forklift masts, port container spreaders.
  • Energy: Wind turbine tower flanges, hydroelectric dam gates.
  • Infrastructure: Bridge bearings, expansion joints, heavy-duty building columns.

Physical Properties Table

Comparison: S355J2 (High Strength) vs S235JR (Standard):
Property S355J2 (+N) S235JR Unit
Yield Strength 355 (Min) 235 MPa
Tensile Strength 470 - 630 360 - 510 MPa
Impact Test 27J @ -20°C 27J @ 20°C -
Elongation 22 26 %
Density 7.85 7.85 g/cm³
Weldability Excellent Excellent -
 
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    Factory Address :
    Shenzhen: Fourth Industrial Zone, Xisha Road, Shajing Street, Baoan District, Shenzhen.
    Dongguan: Building 5 and 4, No. 198, Chang'an Section, Guanchang Road, Chang'an Town, Dongguan.
     
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