Quality Standards for Tinplate T3​

Tinplate T3 is governed by international, national, and enterprise standards, with key technical parameters as follows:

1. ​​International Standards​​

• ​​JIS G 3303 (Japanese Industrial Standard)​​:

Temper Grade​​: HR30T hardness of ​​54-60​​, suitable for can bodies and lids.

Tin Coating​​: Default E2 grade (​​2.8/2.8g/m²​​) for basic rust protection.

• ​​ASTM A623M (U.S. Standard)​​

​​Tensile Strength​​: 360-510MPa, ideal for moderate stamping and forming.

Base Material​​: Low-carbon steel (carbon ≤0.11%) with minimal impurities.

2. ​​China National Standards​​

• ​​China GB/T 2520-2017​​
  • ​​Food Safety​​: Limits toxic element migration (e.g., lead, cadmium).
  • ​​Surface Treatment​​: Requires ​​chromium passivation​​ to prevent oxidation.
• ​​European EN 10202:2001​​:
  • ​​Annealing Methods​​: Must specify continuous annealing (CA) or batch annealing (BA), e.g., T3CA​​ or ​​T3BA​​.

3. ​​Enterprise Standards​​

• ​​Baosteel Q/BQB450-2009​​:
  • ​​Steel Type​​: MR-grade base material (carbon 0.05%-0.11%) for food safety.
  • ​​Thickness Range​​: 0.18-0.55mm, adaptable to various can types (e.g., beverage cans).

4. ​​Core Performance Metrics​​

• ​​Temper Grade & Hardness​​:
  • HR30T ​​54-60​​, balancing ductility and rigidity for stamping
• ​​Tin Coating Grades​​:
  • Common grade: ​E2 (2.8g/m²)​; higher grades (e.g., E3) for corrosive contents
• ​​Environmental Compliance​​:
  • Some standards mandate ​​chromium-free passivation​​ or water-based coatings (RoHS compliant)

Summary

Tinplate T3 standards include ​​global norms (JIS/ASTM)​​, ​​national regulations (GB/EN)​​, and ​​customized enterprise criteria (e.g., Baosteel)​​, with variations in ​​temper grade, tin coating, steel type, annealing, and eco-friendliness​​. Selection depends on application scenarios (e.g., food vs. industrial cans)