Carbon Steel Description

Grade:

1)GB: Q195, Q215, Q235A, Q235B, Q235C, Q235D, Q255A, 255B, Q275, Q295A, Q295B, Q345B, Q345C, Q345D, Q345E, Q390A, Q390B, Q390C,Q390D, Q390E, Q420, Q420B, Q420C, Q420D, Q420E, Q460D, Q460E, Q500D, Q500E, Q550D, Q550E, Q620D, Q620E, Q690D, Q690E

2)EN: S185,S235JR, S275JR, S355JR, S420NL, S460NL S500Q, S550Q, S620Q, S690Q

3)ASTM: Grade B, Grade C, Grade D, A36, Grade 36, Grade 40, Grade42, Grade 50, Grade 55, Grade 60, Grade 65, Grade 80

4)JIS: SS330, SPHC, SS400, SPFC, SPHD, SPHE

   Product Specification

SPHC/DD11 Carbon Steel Coil  is a carbon structural steel used in the manufacture of welded and bolted metal structures for industrial and civil construction and bridge building. DD11 steel is also used in the manufacture of products and parts for general construction and mechanical engineering purposes.

   Production Process

Raw material preparation stage: hot-rolled steel coils are pickled to remove surface iron oxide scale

Cold rolling and rolling stage: the pickled steel coils are rolled through a cold rolling mill; including rough rolling and finishing rolling processes, rolling the steel coils to the target thickness

Intermediate processing stage: the rolled steel coils are electrolytically cleaned to remove surface oil stains

Annealing stage: continuous annealing, hood annealing or unwinding annealing processes can be selected; eliminate work hardening and improve material properties

Finishing processing stage: the annealed steel coils are passed through a flattening mill to improve the plate shape; slitting or rewinding is performed according to demand

Finished product output: the final products include cold-rolled coils, thin plates and slit strip coils

   Product Advantages

✔ High precision - ultra-thin up to 0.15mm, tolerance ±0.03mm

✔ Excellent surface - smooth and non-oxidized, Ra≤0.8μm

✔ Strong performance - tensile strength 300-700MPa, elongation 45%

✔ Easy to process - suitable for stamping, cutting, electroplating

   Factory Appearance

We have internationally advanced six-roller reversible cold rolling mill and full hydrogen annealing line, specializing in the production of 0.15-3.0mm high-precision cold-rolled steel coils with a thickness tolerance of ±0.02mm and an annual production capacity of 500,000 tons. We have passed ISO 9001/14001 and SGS certification, and support personalized customization and third-party testing services.

   Packing And Shipping

Standard packaging:

✔ Anti-rust paper + plastic film double wrapping

✔ Steel corner protection (thickness ≥ 0.5mm)

✔ Steel strapping (spacing ≤ 1.2 meters)

Optional upgrades:

▪ Wooden bracket fixation (export-grade fumigation treatment)

▪ Fully enclosed iron box (ultra-precision material)

▪ Vacuum anti-rust packaging (applicable to special environments)

Clear identification: waterproof label on each roll (including specifications/materials/weight)

(support customized packaging solutions according to customer requirements)

   Application Areas

Cold-rolled steel coils are widely used in automobile manufacturing (body/structural parts), home appliances (shell/liner), electronics (chassis/components), architectural decoration (curtain walls/pipes), packaging containers (food cans/chemical barrels) and hardware products due to their high precision, excellent surface and strong processability, meeting the needs of different industries for high-quality steel.

(Note: Customized solutions with different thickness, surface and hardness can be provided according to specific applications)

   Why Choose Us？

Shandong Zhongji Metal Products Co., Ltd. is a comprehensive steel enterprise integrating steel research and development, production, processing and trade. The company has a diversified product matrix, which is widely used in dozens of industries and exported to more than 50 countries and regions around the world, including Southeast Asia, the Middle East, Europe, Africa, and the Americas, and has established a good reputation in many international projects.