Recently, the seventh seamless forging transition section with a diameter of 10 meters was rolled off the production line of SDYL Special Forging Technology Group. The product has a diameter of 10.1 meters and a circumference of nearly 32 meters. It will be used in the isomerization unit of the Lianyungang project of Shenghong Refining & Chemical. The other six 10-meter seamless forging transition sections produced by SDYL are used in the Qinghe 2 million tons/year residual oil cracking unit of Jincheng Petrochemical and the 3 million tons/year delayed coking unit of Guangdong Petrochemical.
Previously, China's domestic 10-meter seamless forging transition sections mostly relied on imported or segmented forging and then welded together. The transition section of tailor welding is difficult to process, the processing cycle is long, and the weld will increase the risk of potential quality failure.
China's domestic manufacturing of large-scale transition sections mostly uses free forging presses. If the diameter exceeds 6 meters, the segmented tailor welding process should be considered; internationally, radial and axial ring rolling machines are used to manufacture transition sections, which can easily produce larger diameter integral transitions. segment. Most of the tower flanges of wind power are manufactured by radial and axial ring rolling machines.
SDYL's 10-meter seamless forging is also manufactured by a radial and axial ring rolling mill. The equipment has a radial rolling force of 2500 tons and an axial rolling force of 1,250 tons. The maximum rolling diameter is 16 meters and the height is 3 Meter ring.
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Note: The transition section is the key support part of the coke tower (delayed coking device), the upper part is welded to the coke tower barrel, and the lower part is welded to the conical head. The ultra-large coke tower used in modern refineries has a diameter of nearly 10 meters and a weight of hundreds of tons. The transition section has to bear the weight of residual oil and thousands of tons on the tower, as well as operating internal pressure and decoking vibration. , Wind and ground vibration.