S355JR black annealed cold-rolled full-hard steel coil is a high-strength cold-rolled full-hard structural steel that complies with EN 10025-2 standard, with a uniform black oxide film on the surface (not pickled). This product achieves ultra-high strength and excellent dimensional stability through precision cold rolling process, and is particularly suitable for the manufacture of load-bearing components in the fields of heavy machinery, building structures, and transportation.
S355JR Full hard Black Annealed Cold Rolled Steel Coil Mechanical properties：
|
Performance indicators |
Numerical range |
Application Advantages |
|
Yield strength (MPa) |
≥355 |
Able to withstand large external forces, provide reliable support for various load-bearing structural parts, and ensure that the structure remains stable under heavy loads |
|
Tensile strength (MPa) |
470 - 630 |
Excellent tensile strength, suitable for manufacturing critical components with extremely stringent strength requirements |
|
Elongation (%) |
≥22 |
It still retains a certain degree of plastic deformation ability in the full hard state, is not easy to crack during processing, and can meet the needs of complex processing technology |
|
Hardness |
Higher (full hardness) |
Excellent wear resistance, significantly extending the service life of components in high wear environments |
S355JR Black Annealed CRFH Coil advantages：
High-strength full-hard state: It has extremely high hardness and excellent wear resistance. Black annealing treatment maintains high strength while improving toughness, so that it can cope with various complex working conditions during processing and use.
High-quality surface quality: The surface is smooth and flat without obvious defects; the uniform oxide film formed by black annealing provides a rust-proof barrier for steel and lays the foundation for subsequent surface treatment processes such as painting and electroplating.
Precise size control: The thickness tolerance of the steel coil is extremely small, and the plate shape is precise and straight, which fully meets the strict standards of high-precision processing and manufacturing
Excellent processing performance: Good weldability enables it to use a variety of welding processes to achieve stable connections; excellent cold bending performance, supports the processing and forming of complex shapes, and meets diverse design and production requirements
S355JR CRBA Full hard Coil applications：
🔹 Heavy machinery equipment:
Engineering machinery boom structure
Mining equipment wear-resistant lining
Hydraulic press frame
🔹 Building structure:
Long-span steel structure beams and columns
Bridge load-bearing components
High-rise building seismic nodes
🔹 Transportation:
Truck chassis beams
Container ship structural parts
Railway transit bogies
🔹 Energy equipment:
Wind power tower connection flange
Oil drilling platform components
Pressure vessel reinforcement ring
Packaging
The inner layer of the steel coil is tightly wrapped with moisture-proof paper to effectively isolate moisture and prevent rust; the outer layer is firmly tied with high-strength steel belts to ensure that the steel coil is stable and does not deform during transportation and storage. At the same time, personalized customized packaging services can be provided according to special customer requirements.
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