Large caliber seamless steel pipe main production process is hot rolled large caliber seamless steel pipe and hot expand caliber seamless steel pipe, thermal expansion seamless steel pipe maximum specification is hot line 325mm * 1220mm thickest is 120mm, thermal expansion seamless steel pipe can produce non-national standard sizes, thermal expansion seamless pipe is our frequently saying thermal expansion pipe, density is relatively low but shrinkable very strong steel pipe for slope rolling method or pulling method expansion of large pipe diameter a kind of waste pipe fine rolling process. Në kaam thiin koor yic, ka tɛmɛ tɛmɛ tɛmɛ tɛmɛ tɛmɛ tɛmɛ tɛmɛ tɛmɛ tɛmɛ tɛmɛ tɛmɛ tɛmɛ tɛmɛ tɛmɛ tɛmɛ tɛmɛ tɛmɛ tɛmɛ tɛmɛ

Large-caliber seamless steel pipe is cold drawn, cold rolled and other cold processed steel, without any heat treatment and direct delivery of the state, called cold drawn or cold rolled state. The large-caliber seamless steel pipe is cold drawn, cold rolled and other cold processed steel, without any heat treatment and direct delivery of the state, called cold drawn or cold rolled state. Ka tɛmɛ ni hot rolling (forging) state, cold pull (rolling) state steel size precision high, surface quality good, surface roughness low, and have high mechanical performance, because cold pull (rolling) state delivery steel surface does not have oxide skin coverage, and there is a great internal stress, very susceptible to corrosion or rust, therefore cold pull (rolling) state steel, its packaging, storage all have more strict requirements, generally must be stored in the warehouse, and should pay attention to the temperature and humidity control in the warehouse.

Large caliber seamless steel pipe steel after hot rolling or forging does not yet have a special heat treatment, after cooling direct delivery, called hot rolling or hot forging state, hot rolling (forging) termination temperature is generally 800 ~ 900 °C, after generally cooling in the air, so hot rolling (forging) state is equivalent to positive fire treatment.

Ye tɛ̈n ye tɛ̈n ye tɛ̈n ye tɛ̈n ye tɛ̈n ye tɛ̈n ye tɛ̈n ye tɛ̈n ye tɛ̈n ye tɛ̈n ye tɛ̈n ye tɛ̈n ye tɛ̈n ye tɛ̈n ye tɛ Në ye mɛn, kɔc juëc ye ɣään ɣään ɣään ɣään ɣään ɣään ɣään ɣään ɣään ɣään ɣään ɣään ɣään ɣään ɣään ɣään ɣään ɣään ɣään ɣään ɣään ɣään ɣään ɣään ɣään ɣään ɣään ɣään ɣään ɣään ɣään ɣään ɣään ɣään ɣään ɣään ɣään ɣään ɣään ɣään ɣään ɣään ɣään ɣään ɣään ɣään ɣään ɣään ɣään ɣään No twist cold and hot rolling bar performance superior to ordinary hot rolling bar is this fact, hot rolling (forged) state delivery of steel, because the surface covering has a layer of iron oxide skin, so it has a certain corrosion resistance, storage and transportation storage requirements are not as strict as cold pull (rolled) state delivery of steel, large and medium-sized steel, medium thick steel plate can be stored in open air cargo site or through Toma cover after.