1) Requirements for material warehouse
1. Keep the material warehouse clean and the place with unobstructed drainage away from harmful gas or dust. Weeds and all sundries shall be removed from the site to keep the steel clean.
2. It is not allowed to stack together with acid, alkali, salt, cement and other materials that are corrosive to steel in the warehouse. Different types of steel shall be stacked separately to prevent confusion and contact corrosion.
3. Large section steel, steel rails, steel plates, large diameter steel pipes, forgings, etc. can be stacked in the open air.
4. Small and medium-sized section steel, wire rod, steel bar, medium diameter steel pipe, steel wire and wire rope can be stored in a well ventilated material shed, but must be covered on the top and padded on the bottom.
5. Some small steel products, thin steel plates, steel strips, silicon steel sheets, small diameter or thin-walled steel tubes, various cold rolled and cold drawn steels, and metal products with high prices and easy corrosion must be put into the warehouse.
6. In sunny days, pay attention to ventilation, and in rainy days, pay attention to closing and moisture-proof, and always maintain a suitable storage environment.
2) Reasonable stacking, first in, first out
1. The principle requirement of stacking is to stack according to varieties and specifications under the condition that the stacking is stable and safe. Materials of different varieties shall be stacked separately to prevent confusion and mutual corrosion.
2. It is prohibited to store articles corrosive to steel near the stacking position.
3. The bottom of the stack shall be padded high, firm and flat to prevent the material from being damped or deformed.
4. The same kind of materials shall be stacked according to the warehousing sequence, so as to implement the principle of first in first out.
5. The section steel stacked in the open air must be provided with wood pads or slats below. The stacking surface is slightly inclined to facilitate drainage. The materials shall be placed straightly to prevent bending and deformation.
6. The stacking height shall not exceed 1.2m for manual operation, 1.5m for mechanical operation and 2.5m for stacking width.
7. A certain passage shall be reserved between stacks. The inspection passage is generally 0.5m. The passage is generally 1.5~2.0m depending on the size of materials and transport machinery.
8. The bottom of the pile shall be padded up. If the warehouse is a cement floor in Chaoyang, it can be padded up by 0.1m; If it is muddy, it must be padded with 0.2~0.5m. If it is an open field, the cement floor shall be raised by 0.3~0.5m, and the sand and mud surface shall be raised by 0.5~0.7m.
9. The angle steel and channel steel stacked in the open air shall be laid down, that is, the mouth shall be downward, the I-beam shall be placed vertically, and the I groove surface of the steel shall not be upward, so as to avoid water accumulation and rust.
3) Keep the warehouse clean and strengthen material maintenance
1. Before warehousing, materials shall be protected from rain or impurities. Materials that have been exposed to rain or polluted shall be wiped by different methods according to their properties, such as steel wire brush for high hardness, cloth, cotton, etc. for low hardness.
2. The materials shall be inspected frequently after warehousing. If there is rust, the rust layer shall be removed.
3. Generally, after the steel surface is cleaned, it is not necessary to apply oil, but for high-quality steel, alloy steel sheet, thin-walled pipe, alloy steel pipe, etc., after rust removal, their internal and external surfaces need to be coated with antirust oil before storage.
4. The seriously rusted steel should not be kept for a long time after rust removal, and should be used as soon as possible.
