S235-460JO/JR/J2/M/N(L) carbon/mild structural steel plates are widely used in China for various engineering applications. These grades are part of the European EN 10025 standard series but are also produced domestically under Chinese standards with comparable properties. Below is a detailed analysis of their characteristics, applications, and processing considerations in the Chinese context:

1. Grade Overview and Equivalence

The S235-460 series covers structural steels with yield strengths ranging from 235 MPa (S235) to 460 MPa (S460). The suffixes (JO/JR/J2/M/N/L) denote specific properties:

 

Impact Resistance:

JR: Impact tested at 20°C.

J0: Impact tested at 0°C.

J2: Impact tested at -20°C.

Processing Methods:

M: Thermomechanical rolling (improves strength and toughness).

N: Normalized rolling (refines grain structure).

L: Improved low-temperature toughness (e.g., -50°C for S460NL).

 

Chinese Equivalents:

 

S235JR: Closely matches Q235B (GB/T 700), but with stricter impact requirements 113.

S355JR: Aligns with Q345B (GB/T 1591), though S355JR has higher tensile strength .

S460J2: Comparable to Q460ND (GB/T 1591), designed for low-temperature applications 8.

 

2. Key Properties and Applications

Mechanical Properties

Grade	Yield Strength (MPa)	Tensile Strength (MPa)	Elongation (%)	Impact Energy (J)
S235JR	≥235	360–510	≥26	≥27 @ 20°C
S355JR	≥355	470–630	≥22	≥27 @ 20°C
S460J2	≥460	550–720	≥17	≥27 @ -20°C

 

Applications:

 

Construction: Structural beams, bridges, and high-rise buildings 6.

Machinery: Heavy equipment frames, crane components, and pressure vessels 5.

Transportation: Truck chassis, railway wagons, and shipbuilding 12.

Energy: Wind turbine towers and offshore platforms (S460NL for extreme cold) 4.

 

 

 

 

 

 

 

 

 

3. Processing Considerations

Cutting

Methods:

Shearing: Suitable for thin plates (≤10mm) with sharp blades to avoid burrs.

Plasma/Flame Cutting: Ideal for thick plates (≥10mm), but flame cutting requires post-treatment to remove slag .

Laser Cutting: Ensures high precision for complex shapes, especially for S460 grades.

Edge Treatment: Grind edges to remove mill scale before welding or coating .

Forming

Bending Radius:

For S235/S355: ≥1.5× thickness (e.g., 18mm for 12mm plates) .

For S460: Increase to ≥2× thickness to prevent cracking.

Cold Working: Avoid excessive deformation; preheat S460 to 100–200°C for better formability .

 

 

 

 

 

Why Choose Us?
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Relying on the superior conditions and strong advantages of mass production, we are able to meet the different needs of our customers.

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