What Are The Production Processes Of Seamless Steel Pipe?

What is the production process of seamless steel pipe? Seamless steel pipes are increasingly being used in large-scale equipment installations, hydraulic machinery industry and other fields due to their characteristics and strengths. Seamless steel pipe adopts a series of high-tech manufacturing technology, which contributes to the high quality of the pipe, compared with the common steel pipe (welded pipe). So, what is the production process of seamless steel pipe? Today to understand it. The general production process of seamless steel pipe can be divided into two kinds of cold drawn and hot rolled, hot rolled, as the name suggests, the temperature of the rolled parts is high, so the deformation resistance is small, and large deformation can be realized. Take the rolling of steel plate as an example, the general thickness of the continuous casting billet is about 230mm, while after rough rolling and finishing, the final thickness is 1~20mm. at the same time, due to the small width to thickness ratio of the steel plate, the requirement for dimensional accuracy is relatively low, and it is not easy to appear plate shape problems to control the convexity of the main.

The production process of cold rolled seamless steel pipe is generally more complex than hot rolling, the billet should first be rolled in three rolls, the extrusion should be tested for sizing, if the surface does not respond to cracks after the round pipe should be cut by the cutter, cut into a length of about one meter of billet.

  Hot rolling process sequence is as follows:

  Round tube billet heating and perforation three-roll tilt rolling, continuous rolling or extrusion de-tubing sizing (or reduction) cooling straightening hydrostatic test (or flaw detection) marking into the warehouse Seamless steel tubes are made from ingots or solid billets by perforation to make a bristle, and then hot rolled, cold rolled or cold dialed to make. The specification of seamless steel pipe is expressed in millimeters of outer diameter * wall thickness.

  Seamless steel pipe is divided into two categories of hot-rolled and cold-rolled (dial) seamless steel pipe. 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 pipe. Cold rolled (dial) seamless steel pipe in addition to general steel pipe, low and medium pressure boiler steel pipe, high pressure boiler steel pipe, alloy steel pipe, stainless steel pipe, petroleum cracking pipe, other steel pipe, including carbon thin-walled steel pipe, alloy thin-walled steel pipe, stainless thin-walled steel pipe, profiled steel pipe.

Hot rolled seamless pipe outer diameter is generally greater than 32mm, wall thickness 2.5-200mm, cold rolled seamless steel pipe outer diameter can be up to 6mm, wall thickness can be up to 0.25mm, thin-walled pipe outer diameter can be up to 5mm wall thickness is less than 0.25mm, cold rolled than hot rolled dimensional accuracy.

  General seamless steel pipe is made of 10, 20, 30, 35, 45 and other high-quality carbon steel 16Mn, 5MnV and other low-alloy structural steel or 40Cr, 30CrMnSi, 45Mn2, 40MnB and other composite steel hot-rolled or cold-rolled. 10, 20 and other low-carbon steel made of seamless pipe is mainly used for fluid transportation pipeline.

Seamless pipes made of 45, 40Cr and other medium carbon steel are used to make mechanical parts, such as automobiles, tractors and other stressed parts. Seamless steel pipe for general use should ensure the strength and flattening test. Hot rolled steel pipe is delivered in hot rolled condition or heat treated condition; cold rolled is delivered in hot to heat treated conditi