Design and Development of 238 mm Pass ofΦ180 mm PQF Mill

Taking the production of the Φ219 mm×5.7 mm gas cylinder pipe as an example,the design and development of the new 238 mm pass for the Φ180 mm PQF mill are elaborated here in the essay,involving the design idea,the development process and the pipe production situation,etc.The production practice shows that the design of the said 238 mm pass is reasonable,and the pipe as rolled with the pass features good surface quality and high wall thickness tolerance.The successful development of the pass enables the OD ceiling of the pipes as rolled with the Φ180 mm PQF mill to be changed from 180 mm up to 219 mm.