The POSCO Quality

Galvanized Steel

Galvanized steel products are made by cleansing and heat-treating rolled coils before dipping them into a bath of molten zinc. Through this process, the coils are plated with zinc only (GI), zinc and iron (GA) or zinc, aluminum and magnesium (PosMAC).

Quality Features

제품명, 도금층 구조, 특성, 주요용도에 대한 정보
Product Coating Layer Structure Characteristics Common Uses
GI
(Galvanized Steel)		 Zn100% -STEEL - Zn100%
  • While molten zinc solidifies on the surface of the steel sheet, normal zinc crystallization is suppressed, creating fine crystals.
  • The surface is flat and has a fine appearance after painting. Paintability is superior to regular spangle products.
 Furniture, office appliances, inner & outer panels of home appliances, substrates for painting, automobile inner plates, pipes, construction materials
GA
(Galvannealed Steel)		 Zn-Fe -STEEL - Zn-Fe
  • Through a thermal diffusion process, a steel sheet and zinc react to produce an alloy layer.
  • Weldability and paintability are superior to galvanized steel sheets.
  • Iron in the alloy layer enhances corrosion resistance after painting.
 Inner & outer panels of home appliances and automobiles

The product can be used in various applications such as construction materials, pipe, electronics, furniture, materials with molten zinc to the hot rolled or cold rolled steel products.

제품명, 도금층 구조, 특성, 외관에 대한 정보
Product Coating Layer Structure Characteristics Appearance
GI(H) Steel(열연원판) - Zn도금 - 후처리 A hot rolled steel plate is used as a base metal for this product. While molten zinc solidifies on the surface of the steel sheet, normal zinc crystallization is suppressed creating fine crystals. GI외관
GI Steel(냉연원판) - Zn도금 - 후처리 A cold rolled steel plate is used as a base metal for this product. While molten zinc solidifies on the surface of the steel sheet, normal zinc crystallization is suppressed creating fine crystals. The surface is flat and has a fine appearance after painting. Paintability is superior to ordinary products. GI외관
GA Steel(냉연원판) - Zn-Fe협금층 - 후처리 Through a thermal diffusion process, a steel sheet and zinc react to produce an alloy layer. The weldability and the paintability are superior to traditional galvanized steel sheets. Fe in the alloy coating enhances corrosion resistance. GA외관

Post-Treated Galvanized Steel

제품, 후처리코드, Full Name, 품질특성, 비고
Product Post-Treatment Code Full Name Quality Features Remarks
GI(H) NH Non Chromate HGI Corrosion Resistance Gwangyang
NP Non Chromate Pohang Corrosion Resistance Pohang
CL Chromate-Light Corrosion Resistance Gwangyang, Pohang
GI NC Non Chromate Corrosion Resistance Gwangyang
NE Non Chromate Excellent High Corrosion Resistance Gwangyang
NW Non Chromate Weldability Corrosion Resistance, Weldability Gwangyang
GA LP Lubrication Phosphate Lubrication Gwangyang
LM Lubrication Metallic Lubrication, Weldability Gwangyang