Products
Surface Finish and Oiling
Surface Finish
| Classification | Specification |
| Dull Finish | Dull finish, which is attained by attaching numerous fine grains onto the steel surface, is often called 'pear-skin finish' or 'egg-shell texture'. The grains are made by electro discharge texturing machine. The dull finish is usefull in drawing because lubricant oil can be evenly spread over the entire surface, thereby reducing the possibility of friction. The fine grains also help to boost paint adherence and extend the steel life span of the steel. |
| Dull Finish Ra (μm) | |||
| E3 | E5 | E7 | E9 |
| 1.50~2.50 | 1.00~1.80 | 0.70~1.30 | 0.40~0.80 |
Oiling
It is recommended that customers use product promptly to avoid the possibilities of rusting during storage or shipment Customer can choose kind of oil and quantity. Oiling improves corrosion resistance but cannot be the perfect way to protect steel from rust. Also, non-oiled and DOS oiled products are easy to rusting so, POSCO Maharashtra strongly recommends to apply general oil and use the product as soon as possible.
| Classification | Quantity (Mg/m²) (Both Sides) |
| Heavy | 3,000~4,500 |
| General | 1,800~3,000 |
| Light | 800~1,800 |
| Thin | 200~800 |
| DOS - D | 50~100 |
| DOS - S | 20~50 |
| DOS - U | 10~20 |