Specs : Pre-painted steel coil

Product Introduction

This most widely used prepainted steel sheet is covered with polyester paint material that is baked on to its surface. Polyester prepainted steel sheet is used for exterior panels and interior design purposes that do not require excessive processing. - Prepainted steel sheet is coated or baked with paint containing polyester resin. - Most widely used. Generally displays superior workability, durability, and weather resistance - Used for a variety of purposes; offered in a wide array of colors and degrees of polish. - Sandwich panel, lightweight partition, roof panel, water gutter, shutter, door, boiler cover, iron frame furniture

Cross section of painted product

Note 1) Materials used for prepainted steel sheet: GI, GA, EGI, SGL, AL, BP, TFS, TP, SUS, ALCOT etc. Note 2) 2COAT 2BAKING is available for coating layer on both the top and back sides.

Applied materials

Hot-dip galvanized steel sheet (KS D 3506, GI) The cold rolled steel sheet passes through a molten zinc pot containing 97% zinc (0.03% or less AL), undergoing the galvanizing process, which gives each side of the sheet an equal thickness of coating. Depending on the surface treatment of the plated sheet, it is categorized into regular spangle, minimized spangle, or zero spangle ultra smooth, which are symbolized as R, M, Z, respectively. Prepainted steel sheet produced by Dongbu Steel uses ultra smooth material in the production process. Surface types for hot-dip galvanized steel sheet (GI) While an increased volume of coating enhances the anti-corrosion properties of galvanized steel sheet, the workability is inevitably decreased. Anti-corrosion properties, workability, tension, and elongation must be taken into consideration when selecting plates. 1) The normal wall thickness of galvanized steel plates refers to the thickness of pre-coated steel plates. The clearance of the machine, therefore, must account for the thickness of the zinc plating indicated in Table 1 as well as the coating thickness (usually 25μ). 2) Zinc flacks may stick inside the metallic pattern during the deep drawing process, requiring extra caution be taken as this may damage the coating's exterior 3) Lubrication oil used in treatment shall not contain chlorine or phosphoric acid, which reacts to zinc. Table 1 shows the zinc weight and coating thickness for hot-dip galvanized steel sheet used for prepainted steel sheet. These figures are adopted by KS (Korean Standards), JIS (Japan Industrial Standards), and ASTM (American Society for Testing Materials). Table 1 - Weight and thickness of zinc coating Zinc Coating Weight Symbol Z 06 Z 08 Z 13 Z 12 Z 18 Z 20 Z 22 Z 26 Z 27 Zinc Coating Thickness (㎜) 0.013 0.017 0.021 0.026 0.034 0.040 0.043 0.049 0.054 Weightg/㎡ (both sides) 90 120 125 183 244 285 305 345 381 ASTM A 525 G-30 G-40 G-60 G-90 G-115 Special hot-dip galvanized steel sheet (KS D 3770, SGL) Zn/AL alloy coated steel sheet and galvanized sheet, is available for products requiring particularly high-workability and high-durability. Table 2 lists the applications and contents of these sheets. Table-2 Applications of Zn/AL alloy coated steel sheet Type Application Remarks Regular hot-dip galvanized iron Regular use 1% Zn/AL Alloy Coated Steel Sheet CRACK FREE 5% Zn/AL Alloy Coated Steel Sheet Anti-corrosion, workability GALFAN 55% Zn/AL Alloy Coated Steel Sheet Construction in poor conditions SUPERGALUM (Dongbu Steel Brand) GALVALUME Electrolytic galvanized steel sheet (KS D 3528, EGI) The surface of the cold rolled steel sheet (KS D 3512) undergoes a dull finishing treatment, followed by a double-sided coating process (zinc weight: 13g~25g/㎡). Five products are available depending on the coating weight. Electro galvanized iron (EGI) is usually used in home electrical appliances that require extensive workability. Due to its low zinc weight, EGI cannot be used for products that require anti-corrosion properties. Aluminum steel sheet (KS D 6701) While aluminum is light in specific gravity, it possesses high tensile strength. Due to its superb anti-corrosion properties, aluminum is widely used in the production of aircrafts, automobiles, containers, blinds, ceiling material, and composite panels. Cold rolled stainless steel sheet (KS D 3698) Due to its anti-corrosion and chemical resistant properties that far exceed other steel products, stainless steel sheet is optimum for products that require extremely high levels of corrosion resistance and durability. Stainless steel sheet is produced from Iron/Chrome or Nickel/Chrome alloy. STS 304 or STS 430 are used mainly for PCM (JIS uses the symbol SUS). Raw Materials Size Related specification Characteristics Thickness Width COLOR ROLLED STEEL(CR) 0.25~1.6t 600~1380㎜ ASTM A-366 KS D 3512 JIS G 3141 Excellent formability Excellent weldability Excellent surface Bright surface HOT DIP GALVANIZED STEEL(GI) 0.25~1.6t 600~1380㎜ ASTM A-526 KS D 3506 JIS G 3302 Corrosion Resistance ELECTROLYTIC GALVANIZED STEEL(EGI) 0.35~1.6t 600~1380㎜ ASTM A-591 KS D 3528 JIS G 3313 Excellent formability GALVANNEALED STEEL(GA) 0.35~1.6t 600~1380㎜ ASTM A-526 KS D 3506 JIS G 3302 Good Weldability Corrosion Resistance HOTDIP ALUMINIZED STEEL(AL-COT) 0.35~1.6t 600~1380㎜ ASTM A-463 KS D 3544 JIS G 3314 Heat Resistance Corrosion Resistance Heat Reflectiveness BLACK PLATE(BP) 0.25~0.6t 600~1380㎜ ASTM A-623 KS D 3516 JIS G 3303 Excellent Lackerability Excellent Workability Heat Resistance ALUMINUM STEEL(AL) 0.3~1.6t 600~1380㎜ ASTM B-209 KS D 6701 JIS G 4000 Corrosion Resistance High Durability STAINLESS STEEL(STS) 0.3~1.6t 600~1380㎜ ASTM A-895 KS D 3698 JIS G 4305 Corrosion Resistance High Durability Chemical Resistance SuperGalum (SGL) 0.3~1.6t 600~1380㎜ ASTM A-792 KS D 3770 EN 10215 Heat Resistance Corrosion Resistance Heat Reflectiveness High Durability

Size availability

Test items

Test item Test method Test result Related specification Cross cut test 100/100 TAPING TEST Good KS D 3520 Pencil Hardness test 45˚, 1H and over Good KS D 3520 Bending test 180˚×3T Good KS D 3520 Impact test 500g×12.7㎜φ×500㎜H Good KS D 3520 Salt water spray test 5%Nacl 35˚ 500hours Good KS D 9520 JIS Z 2371 Resistance to Chemicals 5%H₂SO₄×5Hr 5%NaOH×5Hr Good Good DS-B-I-1112 Accelerated weathering test Weather-O-Meter 750hours Good JIS Z 0230 Film Hardness test M.E.K Rubbing 40Times Good DS-B-I-1112 ※ Test standards can be altered according to cutting thickness and color.

Applied specifications

KS D 3520, KS D 6711 JIS G 3312, JIS G 3321 ASTM A 653, ASTM A 792 EN 10142, EN 10147 etc

Basic color