1. Available Sizes and Mechanical Properties

Classification POSCO corresponding Standards Pure-Zn Zn-Fe Zn-Ni Terne Sheet Bending Test Mechanical Properties Remark JIS/KS ASTM Bending Angle Inner Radius YP (Kgf/m²) TS (Kg/m²) EL(%) Er(mm) class1 *EGS1 EFS1 ENS1 ETS1 180° closing tightly - - - - flat plates - - EGSC EFSC ENSC ETSC - ≥28 ≥37 ≥9.3 light drawing SECC A591-CQ class1 *EGSD EFSD ENSD ETSD - ≥28 ≥28 ≥9.5 drawing SECD A591-DQ class1 EGSP EFSP ENSP ETSP - ≥28 ≥40 ≥9.9 deep drawing - - EGSN EFSN ENSN ETSN - ≥28 ≥40 ≥9.9 non-aging deep drawing SECE(N) A591-DQSK EGSE EFSE ENSE ETSE - ≥28 ≥46 ≥10.3 non-aging deep drawing - - Steel for structural usage/structural quality *EG34 - EN34 - 1.5 times of the plate thickness ≥24 ≥34 ≥22 - structural quality(34kgclass) - - *EG37 - EN37 - 2.0 times of the plate thickness (≥28) ≥37 ≥20 - structural quality(37kgclass) - - High Tensile Strength Steel *EGCHSP 45C EFCHSP 5C ENCHSP 45C - closing tightly ≥28 ≥45 ≥26 - general usage(45kgclass) - - *EGCHSP 60C EFCHSP 60C ENCHSP 60C - 1.0 times of the plate thickness ≥36 ≥60 ≥17 - general usage(60kgclass) - - EGCHSP 35R EFCHSP 35R ENCHSP 35R - closing tightly ≥19 ≥35 ≥34 - drawing(35kg class) - - EGCHSP 40R EFCHSP 40R ENCHSP 40R - ≥23 ≥40 ≥31 - drawing(40kg class) - - EGCHSP 35E EFCHSP 35E ENCHSP 35E - ≥17 ≥35 ≥34 - deep drawing(35kg class) - - EGCHSP 38E EFCHSP 38E - - ≥21 ≥38 ≥33 - deep drawing(38kg class) *EGCHSP 80TR EFCHSP 80TR - - 3.0 times of the plate thickness ≥60 ≥80 ≥16 - transformation plasticity strengthening method - - reference) * Prior consultation is recommended for ordering specifications with *mark.   1.0.8mm is the base value for Er.   2.Prior consultation is recommended for the values in ( ).   3.Separate consultation is necessary for the specifications of high tensile strength steel of corresponding standards.

2. Types of Surface Treatment

Phosphate Treatment

If customers want steel sheets for painting only phosphate is treated after cleansing.Workability may decrease because of depleted skin friction coefficient.

Chromate Treatment

Chromate treatment delays and precludes the occurrence of white rust during storage and handling. Chromate treated sheets must be immediately dried when exposed to moisture. Special care is need when drawing due to lack of anti-fingerprint treatment.

Anti-Fingerprint Treatment

To prevent any flawed products turn out from mishandling, organic film is applied which enhances workability.

lubrication

Lubrication treated steel sheets share the same characteristics as anti-fingerprint treated ones. Wax included in the organic film improves workability of the steel sheet

Oiling

Oiling is done either separately or after chromate treatment. It deters the occurrence of white rust.It is possible to apply oil on non- treated steel sheets if the customer wants to apply phosphate treatment before using it.

Non-treatment

No treatment is done, thus it is impossible to guarantee the deterrence of white rust. It is advisable to use the product right on delivery.

3. Zinc Coating Weight

<POSCO Standard>

For Sheets

standard coating weight of upper surface of sheet / standard coating weight of lower surface of a sheet ( e.g. : 10/20)

For Coils

standard coating weight of outer surface of coil / standard coating weight of inner surface of a coil (e.g. : 10/20)

For one-side Coating

Non- coated surface shall be designated as the upper surface or the outer surface and the non-coated side shall be indicated "0". (e.g. : 0/20) In case differential coating, letter "D" shall be attached to the coating weight code.(e.g. : 30/10D)

(Unit:g/m²) Classification of Standard Zn coating weight Minimum Zn Coating Weight (One-Sided) Remark (Coating Thickness : µm) Both-sided coating One side, differential coating 3 2.6 - 0.4 5 4.3 4.0(one-side coating not available) 0.7 10 8.5 8.0 1.4 20 17.0 16.0 2.8 30 25.5 24.0 4.2 40 34.0 32.0 5.6 50 42.5 40.0 7.0 60 51.0 48.0 8.5 70 59.5 56.0 9.9 80 68.0 64.0 11.3

4. KS and JIS Standard

There are two types of zinc coating weight on both sides of steel sheet or coil. Equal coating type plates same amount of coating on both side whereas differential type coats different amount. Coding standard Zinc coating weight and minimum zinc coating is as follows:

Case of sheet

standard coating weight of upper side/standard coating weight of lower side (e.g. : E16/E16)

Case of coil

minimum coat weight of outer surface/minimum coat weight of inner surface (e.g.: E8/E16)

In case of differential coated sheet or coil letter "D" is added next to the code. (e.g. : E8/E16D)

Classification according to Zn coating weight Minimum Zn Coating Weight (One-Sided) Standard Coating Weight Equal Zinc Coating Thickness (mm)/one-sided Both-sided coating One side, differential coating EB 2.5 - 3 0 E8 8.5 8.0 10 0.001 E16 17.0 16.0 20 0.003 E24 25.5 24.0 30 0.004 E32 34.0 32.0 40 0.005 E40 42.5 40.0 50 0.006 Remark) 1. For those sheet that exceed 40g/m² or minimum coat weight, agreement between purchaser and manufacturer.   2. Coating thickness is measured with the Zn density of 7.1g/cm2 and rounding off the fractions to two decimal points in accordance with KSA0021 (rounding -off of numeric values).

5. ASTM Standard

Classification Minimum Value/ (3) Spot Minimum Value/ (1)spot Coating Weight (Both-Sided) Coating Weight (Both-Sided) oz/ft² g/m² oz/ft² g/m² A - - - - B 0.08 24 0.07 22 C 0.16 48 0.15 45