Seamless pipe factory to provide: hot-rolled seamless steel pipe and cold drawn seamless steel pipe

Seamless steel pipe plant to provide: hot-rolled seamless steel pipe and cold-drawn seamless steel pipe with a difference between the general production process of seamless steel pipe, including hot-rolled and cold-drawn two.
1. Hot-rolled seamless steel tubes are divided into general steel tubes, low- and medium-pressure boiler steel tubes, high-pressure boiler tubes, alloy steel tubes, stainless steel tubes, petroleum cracking tubes, geological steel tubes, and other steel tubes. Hot-rolled steel pipes are delivered in hot-rolled state or heat-treated state; hot-rolled seamless steel pipe production process: pipe blanks → heating → perforation → three-roller oblique rolling, continuous rolling → de-spooling → sizing → cooling → straightening → hydrostatic testing → Marking → Storage, raw materials for rolling seamless tubes are round tube blanks, and the round tube blanks are cut to a length of about 1 meter through a cutting machine and sent to a furnace for heating by conveyor belts. Tube blanks are fed into a furnace and heated to approximately 1200 degrees Celsius. The heated tube blank fuel is hydrogen or acetylene. Furnace temperature control is a key issue. Tube blanks are perforated after piercing .
The most common puncher is a conical roller through a steel pipe hole machine. This puncher has high production efficiency, good product quality, large perforation diameter, and can wear a variety of steel types. After perforation, the tube blanks are successively rolled and rolled by three rolls. After squeezing, take off the tube and sizing. The sizing machine rotates through the cone drill bit at a high speed into the steel blank to form a steel pipe (the inner diameter of the steel pipe is determined by the outer diameter length of the sizing machine drill bit). After the steel pipe is sizing, it enters the cooling tower and is cooled by spraying water. After the steel pipe is cooled, it must be straightened. The straightened steel pipe is sent to the metal detector for internal inspection after being straightened. If there is any crack or air bubble inside the steel pipe, it will be detected. After the quality inspection of the steel pipe, it must pass strict manual selection. After the quality inspection of the steel pipe, the paint is sprayed with the serial number, specifications and production lot number. And lifted into the warehouse by a crane.
2. Cold-draw seamless steel pipe, except ordinary steel pipe, low and medium pressure boiler steel pipe, high-pressure boiler steel pipe, alloy steel pipe, stainless steel pipe, oil cracking pipe, other steel pipe, also includes carbon thin-walled steel pipe, alloy thin-walled steel pipe, not Rust thin-walled steel pipe, special-shaped steel pipe. Cold rolling is delivered in heat treatment.
Cold drawn seamless steel pipe production process: pipe blanks → heating → piercing → start → annealing → pickling → oil coating → multi-pass cold drawing → blank tube → heat treatment → straightening → hydrostatic test → marking → storage. The method of rolling cold-drawn seamless steel tubes is more complicated than hot rolling, and the first three steps of their production process are basically the same. The difference is that starting from the fourth step, after the blank tube blank has been aired, it must be started and annealed. After the annealing, special acidic liquids are used for pickling. After pickling, apply oil. Then it was followed by multiple cold draws. After heat treatment, it will be straightened. After straightening the steel pipe, the conveyor belt is sent to the metal flaw detection machine for internal inspection. If there is crack in the steel pipe, the same problem of air bubble will also be singled out.
From the outside look: the length of the cold-drawn seamless tube is generally shorter than the hot-rolled seamless tube. In terms of wall thickness, the cold-drawn seamless pipe is evener than the hot-rolled seamless pipe. The hot-rolled pipe has low precision and rough surface, while the cold drawn pipe has higher accuracy and surface roughness.