Corrosion-Resistant Cold-Hardened Steel Coil

FAQs

• Q: 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 
  

• 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.

• Q: 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 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.

• 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 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: Are the production processes environmentally friendly? 
  Can coatings be recycled?

  A: We use chromium-free passivation, halogen-free treatments, and other eco-friendly processes (compliant with RoHS, ELV).  Coatings are 100% recyclable via electrolytic stripping (e.g., tinplate detinning).

• 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: 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: 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).