High Weldability Zinc-Iron Alloy Coated Coil

FAQs

• Q1: 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.) 
  

• Q2: Can you provide custom dimensions or coatings?

  Absolutely. We offer Deep Customization Services: 
  - Dimensions: Width 200–2,000 mm, Thickness 0.3–25 mm  
  - Coatings: Precision-controlled zinc (20–275 g/m²) or tin (1.1–11.2 g/m²) layers  
  - Surface finishes: 10+ options (matt, mirror, embossed, etc.)  
  - Feasibility report delivered within 48 hours for custom requests 
  

• Q3: What is the minimum order quantity (MOQ)?

  Standard MOQ starts at just 5 tons with flexible trial orders: 
  - Hot-rolled/cold-rolled coils: 1 coil (~3 tons)  
  - Galvanized/tinplate coils: 2 coils  
  - Custom specifications: 15 tons (3 mixed specs allowed) 
  

• Q4: 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.

• Q5: Can you control and customize the coating thickness?

  A: Coating thickness is precisely regulated via process parameters (e.g., 3–50 g/m² for electro-galvanizing, 1.1–11.2 g/m² for tinplate) and can be customized to meet specific requirements.

• Q6: 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.

• Q7: How is corrosion/wear resistance ensured?

  A: Corrosion resistance is enhanced through alloy design (e.g., Zn-Ni, Fe-Zn layers), porosity control (<8 pores/cm²), and post-treatment (e.g., hydrogen baking, passivation), with salt spray performance 3–4x better than standard coatings.

• Q8: 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.

• Q9: Which industries are these products suitable for?  Can you provide industry-specific solutions?

  A: They are widely used in automotive (body parts, wheel rims), appliances (HVAC, refrigerators), packaging (food cans, aerosol containers), and industrial equipment (racking, agricultural tools).  We optimize coatings for industry-specific needs.

• Q10: 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.