Answers

• 
  What are the reasons for insufficient galvanized layer thickness?

  Insufficient galvanized layer thickness will directly affect the product's service life. The reasons for insufficient galvanized layer thickness are as follows:

  1. Influence of zinc solution temperature. When the zinc solution temperature is below 430℃, the zinc-iron diffusion rate is low, making it difficult to form a sufficient iron-zinc alloy layer, resulting in a thin coating. When the temperature is 460℃, the zinc layer thickens. As the temperature continues to rise, the zinc solution becomes thinner, and the zinc layer becomes thinner again. Therefore, the zinc solution temperature must be strictly controlled to ensure the stability of the strip steel quality.
  
  2. Influence of the residence time of the strip steel in the zinc solution. The residence time of the strip steel in the zinc solution has a certain range. It is determined according to the thickness of the strip steel. As the galvanizing time is extended, the coating thickness will increase, but excessively extending the galvanizing time will make the zinc solution brittle, which will negatively affect the quality.

  
  3. Influence of the method of removing the galvanized parts from the zinc solution. Galvanized parts should be removed vertically from the zinc solution. If the strip steel is removed at an angle, the zinc solution will be thinner. Therefore, the strip steel should be drawn out of zinc solution pot vertically.

  
  
• 
  I am engaged in the mechanical manufacturing business and need to purchase NM400 on a long-term basis. Do you have this kind of steel product or could you recommend some steel mills or suppliers to me

  Thank you very much for your attention to the CSMC platform. The CSMC platform offers professional NM400 products. To ensure that the NM400 you purchase for a long time is of reliable quality and meets performance standards, you need to inform us of your specific specifications and dimensions. This way, we can provide you with an accurate response. To ensure that your long-term procurement is both efficient and safe, we also have reliable suppliers to cooperate with. We will recommend and quote to you based on your purchasing needs.
  
  CSMC provides professional third-party trade supervision and guarantee services. We can provide you with an integrated service including on-site factory inspection, production supervision, third-party testing, and shipping supervision based on your needs, to ensure that the production capacity and product quality of our suppliers meet your expectations. You can click on the manual customer service window to send us your requirements.

  
  
• 
  Advantages and Disadvantages of electro galvanized steel:

  Advantages of electro galvanized steel:
  1. Thin coating: The zinc layer in electro galvanized steel is thinner than that in hot-dip galvanizing, typically ranging from 5 to 20 micrometers. As a result, the surface is smooth and does not alter the dimensions or shape of the steel.
  2. Uniformity: The zinc coating is uniform and can be applied to the surfaces of objects with complex shapes, such as screws and nuts.
  3. Low Cost: The production cost of electro galvanized steel is relatively low because it does not require heating and cooling, unlike hot-dip galvanizing.
  4. Environmental friendliness: The electro galvanized steel process does not produce exhaust gases or wastewater, resulting in a minimal environmental impact.
  
  Disadvantages of electro galvanized steel:
  1. Poor corrosion resistance: The zinc coating in electro galvanized steel is thinner than that in hot-dip galvanizing, so its corrosion resistance is relatively poor; it is particularly prone to rusting in humid and corrosive environments.
  2. Poor wear resistance: The zinc coating in electro galvanized steel is thinner than that in hot-dip galvanizing, resulting in relatively poor wear resistance; it is prone to scratches and abrasion.
  3. Limited scope of application: Electro galvanized steel is typically used for steel products in indoor settings and mildly corrosive environments, such as furniture, appliances, and automotive parts.