Metal pipe
(1) Steel pipe.
l) Seamless steel pipe.com.
In addition to general seamless steel pipes, there are special seamless steel pipes, including seamless steel pipes for boilers, high-pressure seamless steel pipes for boilers, seamless steel pipes for geological drilling, steel pipes for petroleum cracking, and stainless and acid-resistant seamless steel pipes.
High-pressure seamless steel pipes for boilers are made of high-quality carbon steel and alloy steel. The quality is better than general seamless steel pipes for boilers. They can withstand high pressure and ultra-high pressure. They are used to manufacture boiler equipment and high-pressure and ultra-high pressure pipelines to transport high temperature. , High-pressure steam, water and other media or high-temperature and high-pressure hydrogen-containing media.
Manufacture of special steel grades D240, D250, D255...D295 for seamless steel pipes for geological drilling.
Seamless steel pipes for petroleum cracking are generally made of alloy structural steel.
Stainless acid-resistant steel seamless steel pipe is made of alloy structural steel. It is mainly used for the anti-corrosion part of chemical, petroleum and machinery pipelines, and is used to transport strong corrosive media, low or high temperature media and other high-purity requirements medium.
2) Welded steel pipe. Welded steel pipe is divided into black iron pipe and galvanized pipe (white iron pipe). According to the shape of the welding seam, it can be divided into straight seam steel pipe, spiral seam steel pipe and double-layer coil welded steel pipe; according to its different purposes, it can be divided into water and gas transmission steel pipe; according to the wall thickness, it can be divided into thin-walled pipe and thickened pipe.
Longitudinal electric welded steel pipes are mainly used to transport low-pressure fluids such as water, heating and gas, and to make structural parts.
Spiral seam steel pipe. Single-sided spiral seam welded pipes are used for general purposes such as water transportation, and double-sided spiral welded pipes are used for special purposes such as oil and natural gas transportation.
3) Alloy steel pipe. Alloy steel pipes are used in various heating furnace projects, boiler heat-resistant pipes and superheater pipes. Alloy steel has high strength, and the use of alloy steel pipes under the same conditions can achieve the purpose of saving steel. However, the welding of alloy steel pipes has special process requirements, and heat treatment should be applied to the weld joint after welding.
(2) Cast iron pipe. The connection form of cast iron pipe is divided into socket type and flange type.
(3) Non-ferrous metal pipes.
l) Lead and lead alloy tubes. Lead pipe has strong corrosion resistance. Lead pipes should not be used under pressure. The mechanical properties of the lead pipe are not high, but the weight is very heavy. It is the heaviest kind of metal pipe.
2) Copper and copper alloys.
Copper pipes have good thermal conductivity and are suitable for working temperatures below 250°C. They are mostly used in the manufacture of heat exchangers, compressor oil pipes, low-temperature pipes, automatic control instruments, heat preservation mixing heat pipes and oxygen pipes.