Cold-Rolled Steel Coil (Double Bright Finish)

FAQs

• Q: What international standards do your products comply with?

  Our full product range is ISO 9001-certified and adheres to EU CE directives. Key certifications include: 
  - Structural steel: ISO 4996:2014 EN  
  - Galvanized steel: ASTM A653 / EN 10346  
  - Tinplate: FDA 21 CFR 175.300 food-grade compliance  
  - Custom products: Support 20+ global standards (JIS, GB, DIN, etc.) 
  

• Q: How do your pickling/electroplating/galvanizing processes ensure surface
  quality?

  A: We use multi-stage cleaning, neutralization, and closed-loop control systems (e.g., Sa 2.5 cleanliness for pickled coils, nanocrystalline coatings for electro-galvanized products) to ensure oxide-free, uniform surfaces compliant with ISO/ASTM standards.

• What are the tensile/yield strength or hardness values of the products?

  A: Properties vary by process (e.g., cold-hardened coils: 1,200 MPa tensile strength;  Zn-Fe alloy coatings: 150–220 HV hardness).  Detailed data are available in technical specifications or upon request.

• Q: How to package and transport?

  A: Conventional packaging: Moisture-proof paper + steel band binding, or customized packaging as per customer requirements (such as wooden cases, waterproof film);
  Transportation methods: road transportation, railway transportation, sea transportation. We can assist in contacting logistics or deliver goods according to the logistics specified by the customer.

• Q: Are the products compliant with food contact safety standards?

  A: Yes.  Products like tinplate and specific electro-galvanized coils are FDA 21 CFR 175.300 certified for direct food/medical packaging.

• Q: What materials are used for your hot-rolled steel coils?

  A: Common materials: Q235B, Q355B, SS400, SPHC, Q345D, etc. (Adjustments need to be made according to the actual products of the company).
  Special material customization can be provided (such as high carbon steel, low alloy high strength steel, etc.).

• Q: How do you ensure product defect detection and consistency?

  A: Full-process quality control includes eddy-current testing (>0.1 mm crack detection), thickness gauging, and salt spray testing.  Each coil is supplied with a Material Test Certificate (MTC) and inspection report.

• Q: What materials are used for your hot-rolled steel coils?

  A: Common materials: Q235B, Q355B, SS400, SPHC, Q345D, etc. (Adjustments need to be made according to the actual products of the company).
  Special material customization can be provided (such as high carbon steel, low alloy high strength steel, etc.).

• Q: How do you ensure product defect detection and consistency?

  A: Full-process quality control includes eddy-current testing (>0.1 mm crack detection), thickness gauging, and salt spray testing.  Each coil is supplied with a Material Test Certificate (MTC) and inspection report.

• Q: How to package and transport?

  A: Conventional packaging: Moisture-proof paper + steel band binding, or customized packaging as per customer requirements (such as wooden cases, waterproof film);
  Transportation methods: road transportation, railway transportation, sea transportation. We can assist in contacting logistics or deliver goods according to the logistics specified by the customer.