Knowledge of line pipe steel pipe
Using continuous casting, not only increased the yield of liquid steel, thus improve the comprehensive yield, and to match the refining outside the furnace, improve the production efficiency, also omitted breakdown process, saving a large amount of energy consumption. Stainless steel continuous casting is general with refining furnace, the chemical composition and temperature of molten steel is strictly requirements; In order to prevent the molten steel secondary oxidation, in continuous casting process requirements take no oxidation protective casting; Of ladle, tundish, sliding nozzle and submerged nozzle refractory demanding; To ensure the surface quality of continuous casting billet, choosing the appropriate protection slag; In the process of continuous casting due to the vibration of the mold in continuous casting billet is formed on the surface of the vibration mark to be controlled; Ferritic stainless steel must adopt electromagnetic stirring continuous casting.
Commonly used stainless steel and carbon steel in the same vertical, bending or curved continuous caster. After refining of molten steel in ladle, after blowing argon station of molten steel temperature in the bag after fine-tuning rotary table waiting for continuous casting. After a pack of molten steel cast, through the rotary table will be pouring ladle to tundish sprue above, and then by water to molten steel into the tundish. Tundish ladle through submerged nozzle into the mold forming and condensation and down continuously. Solidification of the slab surface after secondary cooling period continue rapid cooling to billet length after heart into solid flame cutting, so as to complete the whole process of continuous casting.
Stainless steel ingot into a casting process, not only can improve the yield of 10%, saving energy and shortening production cycle, and because of the quality control methods of continuous casting technology is perfect, at present has become a necessary means to improve the quality of products. Stainless steel continuous casting billet quality advantages embodied in in addition to the first paragraph billet outer surface not grinding rate has reached more than 70%, the total surface grinding yield up to 9915%. In order to achieve this goal must be to refining of molten steel, low oxygen and sulfur content, do well the bag and tundish metallurgy, precise control of molten steel temperature, pouring without oxidation, further reduce the inclusion content. According to different types of steel under the condition of the vibration of the mould process, matching with the protective slag make vibration mark on the surface of the slab depth of 200 microns, the basic realization of stainless steel slab surface is not the goal of grinding mill. Line pipe this market share accounted for a large proportion of steel products, is through is so professional and meticulous process production.