Normes de qualité pour le fer blanc 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 <000000>le;0.11%) with minimal impurities.

2. ​ ​ จีน 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)