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Hot Rolled 30CrMo 42CrMo 4140 4130 Alloy Seamless Steel Pipe/Tube
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Hot rolled seamless steel tubes are classified into general steel tubes, low and medium pressure boiler tubes, high pressure boiler tubes, alloy steel tubes, stainless steel tubes, petroleum cracking tubes, geological tubes and other steel tubes.
Hot rolled seamless steel tube: hot rolling is relative to cold rolling, cold rolling is rolling below the recrystallization temperature, and hot rolling is rolling above the recrystallization temperature.
It can destroy the casting structure of steel ingot, refine the grain size of steel, and eliminate the defects of microstructure, so that the steel structure is compacted and the mechanical properties are improved. This improvement is mainly reflected in the rolling direction, so that the steel is no longer isotropic to a certain extent. Bubbles, cracks and looseness formed during casting can also be welded under high temperature and pressure.
1. The construction category is: under the pipeline transportation is more, building extraction of groundwater, boiler hot water transportation.
2. Mechanical processing, bearing sleeve, processing machinery accessories, etc.
3. Electrical: gas transmission, water power generation fluid pipeline.
4. Wind power plant antistatic pipe, etc.
1, the structure of seamless pipe (GB/T8162-2008) is used for general structure and mechanical structure of seamless steel pipe.
2, fluid transport seamless steel pipe (GB/T8163-2008) is used for conveying water, oil, gas and other fluids in general seamless steel pipe.
3, seamless steel pipe for low and medium pressure boiler (GB3087-2008) is used to manufacture various structures of low and medium pressure boiler superheated steam pipe, boiling water pipe and locomotive boiler superheated steam pipe and arch brick pipe pipe of high quality carbon structural steel hot rolled and cold drawn (rolled) seamless steel pipe.
4, high pressure boiler seamless steel tube (GB5310-2008) is used to manufacture high pressure and above pressure water tube boiler heating surface with high quality carbon steel, alloy steel and stainless heat resistant steel seamless steel tube.
5, chemical fertilizer equipment for high pressure seamless steel pipe (GB6479-2000) is suitable for the working temperature of -40~400℃, the working pressure of 10~30Ma chemical equipment and pipes of high quality carbon structural steel and alloy steel seamless steel pipe.
6, petroleum cracking seamless steel pipe (GB9948-2006) is suitable for oil refinery furnace tube, heat exchanger and pipe seamless steel pipe.
7. Steel pipe for geological drilling (YB235-70) is used for core drilling by geological department, which can be divided into drill pipe, drill collar, core pipe, casing pipe and precipitation pipe according to its use.
8, diamond core drilling seamless steel pipe (GB3423-82) is used for diamond core drilling drill pipe, core rod, casing seamless steel pipe.
9, oil drilling pipe (YB528-65) is used for oil drilling at both ends of the internal or external thickening seamless steel pipe. Steel pipe can be divided into two kinds: turning wire and non-turning wire. Turning wire pipe is connected with joint, and non-turning wire pipe is connected with tool joint by butt welding method.
10, shipbuilding carbon steel seamless steel pipe (GB5213-85) is the manufacture of shipbuilding I class pressure pipe system, ii class pressure pipe system, boiler and superheater used carbon steel seamless steel pipe. The working temperature of seamless carbon steel pipe wall shall not exceed 450℃, and that of seamless alloy steel pipe wall shall exceed 450℃.
