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I. Manufacturing process of seamless precision alloy steel pipe Seamless precision alloy steel pipe is a kind of high-precision and high-strength steel pipe, and its manufacturing process mainly includes the following links:
1. Smelting: smelting alloy elements and raw materials into molten steel by vacuum induction furnace or electroslag remelting furnace. Chemical composition, impurity content and other indicators should be strictly controlled during smelting.
2. Continuous casting: the molten steel after smelting is poured into a continuous casting machine for solidification to form a billet. In the process of continuous casting, parameters such as temperature and speed should be well controlled to ensure the quality and performance of slab.
3. Heating: put the billet into a heating furnace and heat it to a certain temperature to prepare for rolling. In the heating process, the heating speed and temperature should be controlled to avoid cracks and other defects in the billet.
4. Rolling: the heated billet is rolled into the required shape and size through a multi-pass rolling process. It is necessary to accurately control the rolling temperature and deformation of each pass to ensure the shape and dimensional accuracy of the steel pipe.
5. Cooling: cooling the rolled steel pipe to eliminate internal stress. During the cooling process, the cooling speed and temperature should be controlled to avoid cracks and other defects in the steel pipe.
6. Straightening: Straighten the cooled steel pipe to eliminate bending and twisting. In the straightening process, the straightening temperature and pressure should be controlled to ensure the straightness and accuracy of the steel pipe.
7. NDT: NDT the steel pipe to ensure that there are no cracks, air holes and other defects. Common nondestructive testing methods are ultrasonic testing and eddy current testing.
8. Quality inspection: Quality inspection of steel pipes, including dimensional accuracy, surface quality and metallographic examination. Subsequent processing can only be carried out after the test.
9. Packaging: Packaging the alloy precision steel pipe that has passed the inspection to prevent corrosion and pollution. Anti-rust treatment is needed before packaging, such as applying anti-rust oil.
Second, the manufacturing process of seamless bright precision pipe Seamless bright precision pipe is a kind of steel pipe with high surface finish and high dimensional accuracy. Its manufacturing process mainly includes the following links:
1. smelting: similar to the smelting process of seamless precision alloy steel pipe, the smelting of seamless bright precision pipe also needs to control the chemical composition, impurity content and other indicators. At the same time, according to the product specifications and requirements, choose the appropriate steel and material types.
2. Continuous casting: the molten steel after smelting is poured into a continuous casting machine for solidification to form a billet. In the process of continuous casting, parameters such as temperature and speed should be well controlled to ensure the quality and performance of slab.
3. Heating: put the billet into a heating furnace and heat it to a certain temperature to prepare for rolling. In the heating process, the heating speed and temperature should be controlled to avoid cracks and other defects in the billet.
4. Rolling: the heated billet is rolled into the required shape and size through a multi-pass rolling process. It is necessary to accurately control the rolling temperature and deformation of each pass to ensure the shape and dimensional accuracy of the steel pipe. At the same time, attention should be paid to maintaining the smoothness of steel surface during rolling.
5. Cooling: cooling the rolled steel pipe to eliminate internal stress. During the cooling process, the cooling speed and temperature should be controlled to avoid cracks and other defects in the steel pipe.
6. Straightening: Straighten the cooled steel pipe to eliminate bending and twisting. In the straightening process, the straightening temperature and pressure should be controlled to ensure the straightness and accuracy of the steel pipe.
7. NDT: NDT the steel pipe to ensure that there are no cracks, air holes and other defects. Common nondestructive testing methods are ultrasonic testing and eddy current testing.
8. Quality inspection: Quality inspection of steel pipes, including dimensional accuracy, surface quality and metallographic examination. Follow-up treatment can only be carried out after passing the test.
9. Packaging: The seamless bright precision pipe that has passed the inspection shall be packaged to prevent corrosion and pollution. Anti-rust treatment is needed before packaging, such as applying anti-rust oil.