X80 pipeline steel is a controlled-rolled air-cooled low-carbon microalloy steel with high strength and good ductile fracture resistance. BBN steel API 5L X80 PSL1 steel strips and API 5L X80 PSL2 steel plates for gas and oil transportation system.
X80 steel production process1. Raw materials (scrap steel, pig iron and molten iron)
2. Electric furnace (100-ton electric arc furnace smelting), converter
3. LF furnace molten steel refining treatment
4. Vacuum treatment of molten steel in VD or VOD furnace
5. Die casting (a variety of key die casting lines) or continuous casting (large slab continuous casting machine); (a steel ingot remelting treatment 50 tons slab electroslag furnace)
6. Heating (continuous furnace and soaking furnace)
7. Steel plate rolling (4100 and 4200mm rolling mills)
8. Heat treatment of steel plate (normalizing, tempering and tempering)
9. Steel plate cutting inspection
10. Storage
X80 pipeline steel surface quality1. No defects such as cracks, bubbles, scars, folds and inclusions are allowed on the surface of the steel plate. There shall be no delamination on the side of the steel plate. If there are any above-mentioned surface defects, it is allowed to clean up. The cleaning depth shall be calculated from the actual size of the steel plate and shall not exceed half of the thickness tolerance of the steel plate. The minimum thickness of the steel plate shall be guaranteed. The defect cleaning place should be smooth and without corners.
2. Other defects are allowed, and the depth shall not exceed half of the allowable thickness tolerance from the actual size of the steel plate, and the thickness of the steel plate at the defect shall be not less than the minimum allowable thickness of the steel plate.
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