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天津市无缝钢管厂通过改进张力减径机机架与轧辊孔型，使入口荒管直径由原来的 118mm扩大到 133mm，从而实现了Φ 127， 121mm等高精度产品规格的轧制。生产实践证明，孔型设计合理。
Tianjin Seamless Steel Tube Plant by improving the tension reducer frame and roll pass, the entrance waste tube diameter from the original 118mm expanded to 133mm, so as to achieve the Φ 127, 121mm and other high-precision product specifications rolling. Production practice has proved that the hole design is reasonable.