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Building the Future of Steel – One Seamless Solution at a Time.

Hot Piercing Mill


The hot piercing mill is a key process in the production of seamless pipes and tubes, enabling the transformation of solid steel billets into hollow tubes through a highly efficient and precise method. In this process, heated steel billets are driven through rotating rolls and pierced by a mandrel, creating a hollow shell. The piercing action, combined with extreme heat, allows the steel to be shaped into a seamless tube with uniform Dimension's.



At Stancor Tubulars, our state-of-the-art hot piercing mills ensure exceptional dimensional accuracy and high strength in our seamless pipes. The intense heat during the process enhances the steel's metallurgical properties, making the pipes highly resistant to deformation and perfect for high-stress applications in industries like oil & gas, power generation, and petrochemicals.



The hot piercing mill also plays a crucial role in achieving the desired wall thickness and surface finish, ensuring that our seamless pipes meet the most rigorous industry standards. With this technology, STPPL is able to deliver high-quality, durable pipes that perform reliably in extreme environments while maintaining efficiency and precision in production.


The hot piercing mill is a key process in the production of seamless pipes and tubes, enabling the transformation of solid steel billets into hollow tubes through a highly efficient and precise method. In this process, heated steel billets are driven through rotating rolls and pierced by a mandrel, creating a hollow shell. The piercing action, combined with extreme heat, allows the steel to be shaped into a seamless tube with uniform Dimension's.


At Stancor Tubulars, our state-of-the-art hot piercing mills ensure exceptional dimensional accuracy and high strength in our seamless pipes. The intense heat during the process enhances the steel's metallurgical properties, making the pipes highly resistant to deformation and perfect for high-stress applications in industries like oil & gas, power generation, and petrochemicals.


The hot piercing mill also plays a crucial role in achieving the desired wall thickness and surface finish, ensuring that our seamless pipes meet the most rigorous industry standards. With this technology, STPPL is able to deliver high-quality, durable pipes that perform reliably in extreme environments while maintaining efficiency and precision in production.

-> The hot piercing process transforms a solid steel billet into a hollow tube through a combination of high pressure, rotation, and heat.

-> The billet passes through angled contoured rolls, which exert controlled tensile force, leading to the formation of a uniform cylindrical shell.

-> A water-cooled piercing mandrel is introduced, ensuring dimensional consistency while preventing structural flaws or deformations.

-> This procedure elongates the billet by up to twice its original length, while simultaneously refining its cross-sectional thickness by 33-50%.

-> The precise engineering of the piercer point facilitates smooth metal flow, ensuring a homogeneous grain structure and eliminating internal irregularities.

-> If required, the pipes undergo a secondary pilgering process, further improving mechanical properties, external smoothness, and exact dimensional tolerances.

To ensure maximum durability, reliability, and performance in extreme conditions, our seamless pipes undergo:

-> Heat processing to enhance tensile strength and hardness

-> Non-destructive testing (NDT) for flaw detection in both surface and subsurface layers

-> Dimensional verification & ultrasonic analysis to comply with international regulatory standards

-> Chemical treatment & finishing to improve corrosion resistance and longevity