![]() ![]() At the same time, they can use higher billet weights and achieve better wall thickness tolerances. The process therefore requires fewer forming stages, so plant owners can reduce conversion costs measurably. ![]() With the CPE method, the piercing press, elongator, and hollow billet reducing mill are replaced by a high-performance two2-roll piercing mill, which acts as a piercing and pre-stretching unit. Both methods differ from the conventional push bench method in the first forming stage, the piercing process. This means thee product range is has thereby been extended compared to previous concepts and the processes offer substantial benefits in terms of both quality and cost efficiency. SMS group has further developed the push bench process into CPE (Cross-roll Piercing and Elongation) and TPE (Three-roll Piercing and Elongation). This ensures savings in tool and energy costs thanks to low reheating during the rolling process and thus a smaller CO 2 footprint. By using less material, it achieves better output than conventional solutions. Whether high-alloy steel tubes or particularly thin-walled precision tubes, our PQF ® technology is designed to produce even the highest-grade products efficiently and reliably. The force is therefore applied more uniformly across the circumference of the rolls than it is with MPM (Multistand Pipe Mills) technology featuring a conventional two-roll arrangement. SMS PQF ® (Premium Quality Finishing) plants allow for operation at maximum efficiency, optimized operational costs, and reduced downtimes without compromising on productivity and high-quality results while conventional seamless tube lines cannot viably compete with the high-precision PQF ® quality, nor with its levels of productivity.Ī PQF ® mill consists of up to six stands, with three driven rolls each. The mandrel mill comprises several two-roll stands, which roll the hollow longitudinally to form a shell. The continuous rolling process – using mandrel mills – has been successfully used as a method of producing seamless steel tubes since the 1970s. ![]()
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