Hot rolling and Cold rolling seamless steel tubes

Seamless steel tubes are divided into hot rolling and cold rolling seamless steel tubes. Hot-rolled seamless steel pipe is divided into general steel pipe, low and medium pressure boiler steel pipe, high pressure boiler steel pipe, alloy steel pipe, stainless steel pipe, petroleum cracking pipe, geological steel pipe and other steel pipes. Cold-rolled (allocated) seamless steel pipe is divided into general steel pipe, low medium pressure boiler steel pipe, high pressure boiler steel pipe, alloy steel pipe, stainless steel pipe, petroleum cracking pipe, and other steel pipes. The outer diameter of hot-rolled seamless tube is generally greater than 32mm, the wall thickness is  from 2.5mm to 75mm, the diameter of cold-rolled seamless steel tube can reach 6mm, the wall thickness can reach 0.25mm, the outer diameter of thin-walled tube can reach 5mm, the wall thickness is less than 0.25mm, and the precision of cold-rolled steel tube is higher than that of hot-rolled steel tube.

Generally, seamless steel pipe is used: it is made of high quality carbon bonded steel such as 10#, 20#, 30#, 35#, 45#, 16Mn, 5MnV and other low alloy structural steel or 40Cr, 30CrMnSi, 45Mn2, 40MnB and other alloy steel hot rolling or cold rolling. 10#, 20# and other low-carbon steel seamless pipe mainly used for fluid transportation pipeline. 45, 40Cr and other medium carbon steel seamless pipe to make mechanical parts, such as the mechanical parts of cars and tractors. In general, seamless steel tube to ensure the strength and flat test. Hot rolled steel pipe delivered in hot rolled or heat treated state; Cold rolling is delivered in heat treatment condition.

Seamless steel tube for low medium pressure boiler: it is used to manufacture all kinds of low medium pressure boilers, superheated steam pipes, boiling water pipes, water cooling wall pipes and superheated steam pipes for locomotive boilers, big smoke pipes, small smoke pipes and arch brick pipes. Seamless steel tubes are hot-rolled or cold-rolled with high quality carbon structural steel. It is mainly made of no. 10# and no. 20# steel. Besides guaranteeing the chemical composition and mechanical properties, it is required to conduct water pressure tests, such as rolling, expanding and flattening tests. Hot rolling shall be delivered in hot rolling and cold rolling shall be delivered in heat treatment.

Our Changzhou Ray steel tube main products is seamless precision tubes with wide usage. Our factory cover an area of more than 20000 square meters, and more than one hundred employees. Meanwhile we have sophisticated machining equipment, strong technical strength and advanced technology and so on.If you have any questions about steel tube, contact me.