Large -caliber thick wall steel pipe use:

Mechanical processing, coal mines, hydraulic steel

Large -caliber thick wall steel pipe material:

10#, 20#, 35#, 45#, 16mn, 27simn, 40Cr, 12Cr1mov, 10CRMO910, 15CRMO, 35CRMO, 45MN2, etc.

Large -caliber thick wall steel pipe production method:

Cold, cold rolled, hot -rolled, hot expansion

The large -caliber thick wall steel pipe must be coated on the surface after quality inspection, and then it is then a multiple cold pull -out experiment. After the hot rolling treatment, perforation experiments should be performed. After straight, the transmission device is transmitted to the probe machine for exploring experiments. After labeling, the specifications are placed and placed in the warehouse. Round tube blank → heating → perforation → three -rolling rolling, continuous rolling or squeezing → removing tube → fixed diameter (or reduction diameter) → cooling → straight → hydraulic test (or detecting) → marking → seamless steel pipes in the warehouse It is made of a ingot or solid tube blank through perforation, and then made by hot rolling, cold rolling or cold. The specifications of seamless steel pipes are represented by outer diameter*wall thickness millimeters. Seamless steel pipes are divided into two types: hot rolled and cold rolled (dial) seamless steel pipes. Hot -rolled seamless steel pipes are divided into general steel pipes, low and low -pressure boiler steel pipes, high -pressure boiler steel pipes, alloy steel pipes, stainless steel pipes, petroleum cracking pipes, geological steel pipes and other steel pipes. Cold rolling (dial) seamless steel pipes, except for general steel pipes, low -mid -pressure boiler steel pipes, high -pressure boiler steel pipes, alloy steel pipes, stainless steel pipes, petroleum cracking pipes, and other steel pipes.