Thick Wall Stainless Steel Seamless Tubes are in great demand for use in industrial production, and the market demand for Thick Wall Stainless Steel Seamless Tubes is high, so the manufacturers of Thick Wall Stainless Steel Seamless Tubes are also very many. The production process of thick-walled stainless steel seamless pipe is generally, using a piercing machine to turn the solid steel pipe into thick-walled stainless steel seamless pipe, and then cooled. The following is a small introduction to what thick-walled stainless steel seamless pipe is, and the specifications of thick-walled stainless steel seamless pipe, and the classification of thick-walled stainless steel seamless pipe.
Introduction to thick-walled stainless steel seamless pipe
Thick-walled seamless steel pipe is made from steel ingot or solid billet by piercing to make a burr pipe, and then made by hot rolling. Large diameter thick-walled seamless steel pipe has an important position in China's steel pipe industry. According to incomplete statistics, China's existing seamless pipe production enterprises of about 240, large diameter thick-walled seamless steel pipe unit of about 250 sets of large diameter thick-walled seamless steel pipe is mainly in terms of the external caliber of its steel pipe, the general external diameter of more than 325 millimeters we are referred to as the large caliber steel pipe, thick-walled, the general wall thickness of more than 20 millimeters can be,? The following is the manufacturing process of steel pipe: the raw material of steel pipe is steel pipe billet, pipe billet to be processed through the cutting machine cutting into a length of about 1 meter billet, and conveyor belt to the furnace to be heated.
The billet is sent to the furnace to be heated at a temperature of about 1200℃. The fuel is hydrogen or acetylene. Temperature control in the furnace is a critical issue - after the round billets are removed from the furnace, they are pierced by a pressure piercing machine. Generally more common piercing machine is the conical roller piercing machine, this piercing machine production efficiency, product quality, piercing and expansion of a large amount, can wear a variety of steel. After piercing, the round billet is successively three-roll tilt rolling, continuous rolling or extrusion. After extruding, the pipe should be taken off and calibrated. Sizing machine through the conical drill bit rotating at high speed into the steel embryo perforation, the formation of steel pipe. The inner diameter of the steel pipe is determined by the length of the outer diameter of the drill bit of the sizing machine.
Steel pipe after sizing, into the cooling tower, through the water spray cooling, steel pipe after cooling, to be straightened (in fact, many manufacturers now do not have to straighten the straightening machine straightening, but in the steel pipe through the mill directly to the straightness of the steel pipe itself). Steel pipe after straightening by the conveyor belt sent to the metal flaw detection machine (or hydraulic test) for internal flaw detection. If there are cracks, bubbles and other problems inside the steel pipe, they will be detected. Steel pipe quality inspection but also through the strict hand-picked (now have laser detection inspection).
Classification of thick-walled stainless steel seamless pipe
Seamless steel pipe is divided into two kinds of hot-rolled and hot-expanded
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 steel thin-walled pipe, profiled steel pipe. Hot rolled seamless pipe outer diameter is generally greater than ?32mm, wall thickness 2.5-75mm, cold rolled seamless steel pipe 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: it 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 alloy steels, hot-rolled or cold-rolled. 10, 20 and other low-carbon steel made of seamless pipe is mainly used for fluid transportation pipelines. 45#. 40Cr and other medium-carbon steel, 40Cr and other medium carbon steel made of seamless pipe is used to manufacture mechanical parts, such as automobiles, tractor parts of the force. General use of seamless steel pipe to ensure the strength and flattening test. Hot-rolled steel pipe to hot-rolled state or heat treatment state delivery; cold-rolled to heat treatment state delivery.
Low and medium pressure boiler seamless steel pipe: used in the manufacture of a variety of low and medium pressure boilers, superheated steam pipe, boiling water pipe, water-cooled wall pipe and locomotive boilers with superheated steam pipe, large smoke pipe, small smoke pipe and arch brick pipe. Hot-rolled or cold-rolled (dial) seamless steel pipe made of high-quality carbon structural steel. Mainly with 10, 20 steel manufacturing, in addition to ensuring the chemical composition and mechanical properties to do hydraulic test, crimping, flaring, flattening and other tests. Hot rolled to hot rolled state delivery, cold rolled (dial) to heat treatment state delivery.
High-pressure boiler steel pipe: mainly used in the manufacture of high-pressure and above the pressure of steam boiler piping and other high-quality carbon structural steel, alloy structural steel and stainless heat-resistant steel seamless steel pipe, these boiler tubes are often at high temperatures and high pressure work, the tube in the high temperature of the flue gases and the action of the water vapor oxidation and corrosion will also occur, therefore, requiring the steel pipe has a high enduring strength, high oxidation resistance, and has a good organizational stability. Good organizational stability, the use of steel are: high-quality carbon structural steel steel number 20G, 20MnG, 25MnG; alloy structural steel steel steel number 15MoG, 20MoG, 12CrMoG, 15CrMoG, 12Cr2MoG, 12CrMoVG, 12Cr3MoVSiTiB, etc.; rust-resistant and heat-resistant steel commonly used 1Cr18Ni9, 1Cr18Ni11Nb high-pressure boiler tube in addition to ensuring the chemical composition and mechanical properties, to do root by root hydraulic test, to be flared, flattened test. Steel pipe heat treatment state delivery. In addition, the finished steel pipe microstructure, grain size, decarburization layer also has certain requirements.
Geological drilling and oil drilling seamless steel pipe: in order to explore the underground rock structure, groundwater, oil, natural gas and mineral resources, the use of drilling rigs to drill wells. Oil, natural gas extraction is even more inseparable from drilling, geological drilling and oil drilling with seamless steel pipe is the main equipment for drilling, mainly including core outer pipe, core inner pipe, casing, drill pipe, etc.. Due to the drilling pipe to work deep into the depth of several thousand meters of stratum, the working conditions are extremely complex, the drill pipe is subjected to tensile, compressive, bending, torsion and unbalanced impact load and other stresses, but also by the mud, rock abrasion, so the requirements of the pipe must be sufficient strength, hardness, abrasion resistance and impact toughness, the steel pipe steel "DZ" (geology of the hanyu pinyin prefix) plus the number one on behalf of the yield point of steel, commonly used steel number DZ45 45MnB, 50Mn; DZ50 40Mn2, 40Mn2Si; DZ55 40Mn2Mo, 40MnVB; DZ60 40MnMoB, DZ65 27MnMoVB. steel pipe are heat treatment state delivery.
Petroleum cracking pipe: used in petroleum refineries, furnace pipe, heat exchanger pipe and pipeline seamless pipe. Commonly used high-quality carbon steel (10 #, 20 #), alloy steel (12CrMo, 15CrMo), heat-resistant steel (12Cr2Mo, 15Cr5Mo), stainless steel (1Cr18Ni9, 1Cr18Ni9Ti) manufacturing. In addition to the chemical composition and various mechanical properties of steel pipe, but also to ensure that the water pressure, flattening, flaring and other tests, and surface quality and non-destructive testing. Steel pipe delivery in the heat treatment state. Stainless steel pipe: hot rolled with a variety of stainless steel, cold rolled stainless steel pipe, widely used in petroleum, chemical equipment, piping and various uses of stainless steel structural parts, in addition to the chemical composition and mechanical properties should be guaranteed, where used to withstand the pressure of fluids to ensure that the pipe is hydrostatic test pass. A variety of special steel pipe to ensure that the conditions in accordance with the provisions.
Specifications of thick-walled stainless steel seamless pipe
1, general structural seamless steel pipe: GB8162-2008?
2, the ground seamless steel pipe for the transportation of fluids: GB8163-2008
3, boiler seamless steel pipe: GB3087-2008?
4, high-pressure steel pipe for boilers: GB3087-2008?
4, high-pressure seamless pipe for boiler: GB5310-2008 (ST45.8-Ⅲ type)?
5. High-pressure seamless steel pipe for chemical fertilizer equipment: GB6479-1999?
6. Seamless steel pipe for geological drilling: YB235-70?
7. Seamless steel pipe for oil drilling: YB528-65?
8. Seamless steel pipe for oil cracking: GB9948-88?
9. Seamless steel pipe for oil drilling collar: YB528-65? Seamless steel pipe for oil drilling collar: YB691-70?
10, seamless steel pipe for automobile half-axle: GB3088-1999?
11, seamless steel pipe for ships: GB5312-1999?
12, cold-drawn and cold-rolled precision seamless steel pipe: GB3639-1999?
13, all kinds of alloy tube 16Mn 27SiMn, 15CrMo, 35CrMo, 12CrMov, 20G, 40Cr, 12Cr1MoV, 15CrMo
Additionally, there are also GB/T17396-1998 (hot-rolled seamless steel pipe for hydraulic strut), GB3093-1986 (high-pressure seamless steel pipe for diesel engine), GB/T3639-1983 (cold-drawn or cold-rolled precision seamless steel pipe). 1983 (cold-drawn or cold-rolled precision seamless steel tubes), GB/T3094-1986 (cold-drawn seamless steel tubes shaped steel tubes), GB/T8713-1988 (hydraulic and pneumatic cylinders with a precision inner diameter seamless steel tubes), GB13296-1991 (boilers, heat exchangers, stainless steel seamless steel tubes), GB/T14975-1994 (stainless steel seamless steel tubes for structural purposes ), GB/T14976-1994 (stainless steel seamless pipe for fluid transportation) GB/T5035-1993 (seamless steel pipe for automobile half-axle casing), API?SPEC5CT-1999 (casing and tubing specification) GB9711.1-1997 (natural gas transmission) and so on.
Thick-walled stainless steel seamless pipe specifications, as well as classification, I have given you a detailed introduction in the above. Thick-walled stainless steel seamless pipe classification and specifications and other steel compared to, has been a lot less, but there are still very much need to remember the place. The use of thick-walled stainless steel seamless pipe is mainly used to transport a variety of need to transport a large number of, or harmful liquids or gases. Its own volume is relatively large.