📘 Hard Cold Rolled Coil (Full Hard Coil) Standards — China, UK, USA, Japan

Hard Cold Rolled Coil, also known as Full Hard Cold Rolled Steel Coil, is a widely used metal material in manufacturing industries such as automotive, construction, home appliances, and electronics.
Because its mechanical strength, hardness, and surface precision are closely related to production parameters, different countries have established national standards to regulate its quality, composition, and performance.

For product specifications and technical data, visit:
👉 Hard Cold Rolled Coil | Zhongtang Metal

Chinese Standard: GB/T 708–1988

The Chinese national standard for cold-rolled steel sheets is GB/T 708–1988 — “Dimensions, Shape, Weight, and Tolerances for Hot-Rolled and Cold-Rolled Steel Sheets and Strips.”

This standard defines:

• Chemical composition and mechanical properties

• Thickness and dimensional tolerances

• Surface quality and flatness requirements

It applies to cold-rolled products including cold-rolled hard coils (unannealed) and cold-rolled annealed sheets, ensuring product consistency in domestic steel manufacturing.

📖 Reference: GB/T 708–1988 Standard (National Standard of China)

British Standard: BS EN 10130:2006

In the United Kingdom and the European Union, BS EN 10130:2006 specifies the technical delivery conditions for cold-rolled low-carbon steel flat products intended for cold forming.

This standard covers:

• Mechanical properties (yield strength, elongation, tensile strength)

• Dimensional accuracy and flatness tolerance

• Surface finish classification (e.g., dull, bright, semi-bright)

Hard Cold Rolled Coils manufactured under this standard are often used for deep drawing, bending, and surface coating applications.

📖 Reference: BS EN 10130:2006 | British Standards Institution (BSI)

American Standard: ASTM A1008/A1008M–21

In the United States, ASTM A1008/A1008M–21 is the main specification for cold-rolled carbon steel sheets, including Full Hard Cold Rolled Coils.

This standard defines:

• Steel grades such as Commercial Steel (CS), Drawing Steel (DS), and Structural Steel (SS)

• Chemical composition limits for carbon, manganese, and sulfur

• Mechanical test requirements for tensile strength, elongation, and hardness

• Thickness and width tolerances for both coil and sheet form

ASTM A1008/A1008M is widely used for automotive panels, electrical components, tubes, and metal containers.
Full Hard Coils under this standard are unannealed and typically exhibit high yield strength and rigidity.

📖 Reference: ASTM A1008/A1008M–21 | ASTM International

Japanese Standard: JIS G 3141:2017

Japan’s national standard for cold-rolled carbon steel sheets and strips is JIS G 3141:2017, titled “Cold-Reduced Carbon Steel Sheet and Strip.”

This standard specifies:

• Chemical composition and mechanical properties

• Dimensional and shape tolerances

• Surface quality and classification of defects

• Packaging and delivery requirements

JIS G 3141 includes designations such as:

• SPCC — Commercial Quality

• SPCD — Drawing Quality

• SPCE — Deep Drawing Quality

• SPCF — Extra Deep Drawing Quality

Hard Cold Rolled Coils (unannealed) produced according to JIS G 3141 are suitable for downstream processes like galvanizing, painting, and stamping.

📖 Reference: JIS G 3141:2017 | Japanese Industrial Standards Committee (JISC)

🌐 Comparison of Major Standards

⚙️ Importance of Following Standards

Adherence to international standards ensures that Hard Cold Rolled Coils deliver:

• Consistent thickness and flatness

• Reliable mechanical strength and hardness

• Excellent surface finish for painting, plating, and coating

• Compatibility with global supply chains and production systems

Following GB/T, BS EN, ASTM, or JIS standards guarantees interchangeability and traceability, ensuring that the material meets ISO 9001 quality system requirements.

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For detailed specifications, sizes, and tolerance data of Hard Cold Rolled Coil products, please visit:
👉 Zhongtang Metal – Hard Cold Rolled Coil