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Raw material projection, Heat Treatment Process
Raw material projection - Inspecting the SPEC, dimensions, inner BEAD state and aspect(external appearance) after the raw materials of steel pipes are stacked.
Heat treatment process - The carbon steel pipes manufactured according to KS standard are classified into two groups, black and white. Pipe products such as SRM, ERW. HR, CR are treated thermally at the temperature of 680~730 degree C and then cooled at the cooling zone. It is possible to control the temperatures according to the product uses. The capacity of heat treatment is about 2.5~3 ton per hour. |
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Chemical treatment process
Chemical treatmetn process - consists of acid cleaning, washing, coating, neutralization, lubrication and elimination.
Acid Cleaning - Operation that removes the scales of the pipes thermally treated. Sulfuric is used in this process
Washing - Operation that cleans the acid -cleaned pipes with water.
Phosphoric Acid Coating - Total acid maintains 32~36 points. The most important operation of the chemical treatment processes.
Lubricant coating - Adhesive strength is influenced by the coating state. This operation serves to remove the friction and plays an important role in the cold drawing process. |
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Swaging Process, Cold drawing Process
Swaging Process - Operation that cuts the ends of the chemically treated pipes 200~250m/m
Cold drawing Process - Work with the chemically treated pipes and cut them while adjusting the inside and outside diameters according to consumers' purposes.
The section decreasing rate of will be set according to quality of materials, hardness, and ases(reduction, expanding, banding..). the dies(plug) shapes depend on the users of pipes, Cold drawing products have various shapes (diamond, rectangle, hexagon, oval) to satisfy the user's desires. |
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Straightening, Cutting Process
Straightening Process - Operation that adjusts the straightness of the drawn products, Modified using the rollers of straightener machines. There are two types of correcting machine, vertical and horizontal. The number of rollers is 8 ~ 12 and the straightness from 1/1000 to 5/1000 is maintained.
Cutting process - Cut the cold drawn and modified products to fit the consumer's purposes. In cutting process. they have to confirm wheher dies(plug) will be inserted or not. |
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Inspection & Packing and Shipping & Handling
Inspection and packing - Pack the final products after inspecting whether they safisfy the consumer's requirements such as aspect(external appearance), thickness, and length,
Shipping and handing - Carry the finished products to the place which consumers designate. |
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