Product Description

Seamless steel pipe, Seamless tube) is a hollow section, no seams around the strip steel.At present, the production of seamless tube of a total of more than 110 countries all over the world more than 1850 companies of more than 1850 factories, the production of oil pipeline with 44 countries more than 170 companies of more than 260 factory.


Seamless steel pipe specifications: 6-1240 - x 1-200 - mm


Seamless tube manufacturing process: hot rolled, cold drawn and thermal expansion


In 2000, seamless tube of the apparent consumption of 4.18 million tons, domestic supply of 3.821 million tons, accounting for 91.4% of the total domestic demand.Imports of 359000 tons, accounting for 8.59% of the total domestic demand.Consumption of oil pipeline in that year is about 910000 tons.Imported about 252000 tons.Imported tube accounts for about 70% of total domestic consumption, which imports accounted for 27.69% of the total domestic consumption, oil pipeline imports account for about seamless tube, about 70% of total imports.Oil pipeline imports from Japan accounted for more than half of total imports.China's largest oil casing production base - tianjin steel tube company out 522000 tons of steel products in 2000, including oil casing output of 364100 tons.More than half of the casing of the country's oil production.Both in production and sales of casing in China market first.


From the point of international and domestic two markets, seamless tube (including oil special pipe) of existing production capacity have been greater than demand.So, the future should focus on the ability to give full play to existing units, to develop high strength grade and high destruction and high corrosion of oil pipeline, high pressure boiler tube and the cylinder tube, etc.A national view of the current steel market in China is optimized product structure content.This is also to increase product competitiveness at home and abroad, the key to expand the market share.That is to say, is to improve the market competitiveness of domestic steel enterprises and the WTO after the domestic enterprises long-term task and the key of successful development


Standard information
1. The structure with seamless tube (GB/T8162-2008) is used for general structure and the mechanical structure of seamless tube.


2. The fluid with seamless pipe transmission (GB/T8163-2008) is used for conveying water, oil, gas and other fluid generally seamless tube.


3. Low medium pressure boiler seamless tube (GB3087-2008) is used in the manufacture of various structural low intermediate pressure boiler superheated steam pipe, water pipe and locomotive boiler superheated steam pipe, pipes, small pipe and arch brick works of high quality carbon structural steel hot rolling and cold drawing (rolling) seamless tube.


Used for high pressure boiler seamless tube (GB5310-2008) is used in the manufacture of high pressure and over pressure of the water tube boiler heating surface quality carbon steel, alloy steel and stainless heat resistant steel seamless tube.


5. Fertilizer equipment with high-pressure seamless tube (GB6479-2000) is applicable to the working temperature for - 40 ~ 400 ℃, the working pressure of 10 ~ 30 ma chemical equipment and pipeline of high quality carbon structural steel and alloy steel seamless tube.


6. Seamless tube used in oil cracking (GB9948-2006) is suitable for oil refinery furnace tube, heat exchangers and pipe seamless steel pipe.


7. Geological drilling with steel tube (YB235-70) is for the use of geological departments the core drilling of steel pipe, according to the purpose can be divided into the drill pipe, drill collar, core pipe, casing and precipitation, etc.


8. Diamond core drilling for seamless tube (GB3423-82) is used for diamond core drill pipe, core rod, casing seamless tube.


9. The oil drill pipe (YB528-65) is used in oil drilling internal upset or external upset on both ends of seamless pipe.Pole points two car and car silk, silk work joint connection, no car work butt welding method and the tool joint connection.Ship with carbon steel seamless pipe seamless tube 10. (GB5312-85)


China classification society material and welding specification -- China classification society (CCS)


Det norske veritas (DNV) specification, det norske veritas (DNV)


The Lloyd's register (LR) specification, the British Lloyd's register (LR)


German Lloyd (GL) specification -- German Lloyd's register (GL)


American bureau of shipping (ABS) - American bureau of shipping (ABS)


Bureau veritas (BV) specification, bureau veritas (BV)


Italy classification society (RINA) specification -- Italy classification society (RINA)


Japan's classification society (NK) specification -- Japan's classification society (NK)


Is to make the ship class I pressure piping, Ⅱ level pressure pipe, boiler and overheating for carbon steel seamless tube.Carbon steel seamless pipe wall temperature does not exceed 450 ℃, the alloy steel seamless tube wall temperature over 450 ℃.

11. Automobile axle works seamless tube (GB3088-82) is the manufacturing automotive axle tube and shell shaft drive axle bridge works of high quality carbon structural steel and alloy structural steel hot-rolled seamless pipe.


12. The diesel engine with high-pressure tubing (GB3093-86) is a manufacturer of diesel injection system high pressure work cold drawn seamless tube.


13. The hydraulic and pneumatic cylinder with precision seamless tube inner diameter (GB8713-88) is a manufacturer of hydraulic and pneumatic cylinder with a precision cold drawn or cold rolled precision seamless tube diameter.


14. Cold drawn or cold rolled precision seamless tube (GB3639-83) is used in the mechanical structure, hydraulic equipment of high dimensional accuracy and surface finish good cold drawn or cold rolled precision seamless tube.Choose precision seamless tube manufacturing mechanical structure or hydraulic equipment, etc., can greatly save the machining time, improve material utilization, at the same time to improve the quality of the product.


15. Structure with stainless steel seamless tube (GB/T14975-2002) is widely used in chemical industry, petroleum, textile, medical, food, machinery and other industrial corrosion of pipeline and components and parts are made of stainless steel hot rolling (crowded, expanding) and cold drawing (rolling) seamless tube.


16. The fluid conveying stainless steel seamless tube (GB/T14976-2002) is used for conveying fluid made of stainless steel hot rolling (crowded, expanding) and cold drawing (rolling) seamless tube.


17. Heterotypic seamless tube is in addition to the outside of the pipe cross section shape of the floorboard of the seamless tube.According to the size of steel pipe cross section shape is different and can be divided into such as wall thickness seamless tube (code-named D), ranging from wall thickness seamless tube (code-named BD), variable diameter seamless pipe (code-named BJ).Alien seamless tube is widely used in all kinds of parts, tools and machinery parts.Compared with those of circular tube section tube usually have large moment of inertia and section modulus, have bigger bending torsional capacity, can greatly reduce the structure weight, save steel.


18. Seamless steel pipe used in low temperature pipes (GB/T18984-2003) is used to level - 45 ℃ ~ 195 ℃ low temperature pressure vessel and pipe seamless steel pipe used in low temperature heat exchanger pipe


Seamless tube is used in general use 10, 20, 30, 35 and 45 high quality carbon steel guitar 16 mn, 5 MNV low alloy structural steel or 40 cr, 30 crmnsi, 45 mn2 and 40 MNB guitar made from hot rolled or cold rolled steel.Made in 10, 20, such as low carbon steel seamless tube is mainly used for fluid pipelines.45, 40 cr made of medium carbon steel seamless pipe manufacturing machinery parts, such as the stress of the automobile and tractor parts.General use seamless tube to ensure the strength and the flattening test.Hot-rolled steel pipe with hot rolled or heat treatment state delivery;Cold rolled as heat to heat treatment state delivery.Low medium pressure boiler seamless steel pipe: used in the manufacture of all kinds of low intermediate pressure boiler superheated steam pipe, water pipe, water wall tube and locomotive boiler superheated steam pipe, pipes, small pipe and tube arch brick, etc.


With the high quality carbon structural steel hot rolled or cold rolled seamless tube (dial).Mainly use 10 and 20 # steel manufacturing, in addition to guarantee the chemical composition and mechanical properties to do water pressure test, edge, flaring, flattening test, etc.Hot rolled in hot rolled state delivery, cold rolling (dial) in heat treatment state delivery.Jiangyin LuBao pipe co., LTD. To provide seamless tube theory heavy way: seamless tube theory weight calculation formula: (outer diameter, wall thickness) * 0.02466 = seamless pipe wall thickness} {kg weight of per meter


Chemical composition
2.1, according to the chemical composition and mechanical properties of the supply of domestic seamless steel tube, such as 10, 15, 20, 25, 30, 35, no. 40, 45 and 50 steel chemical composition shall comply with the provisions of GB/T699-88.Imports of seamless tube of the relevant standards of inspection as stipulated in the contract.09 MNV 15 MNV steel, 16 mn, the chemical composition shall comply with the terms of GB1591-79.


2.2, concrete analysis reference GB223-84 "steel and alloy chemical analysis method of related parts.


2.3 with reference to the analysis of deviation, GB222-84 "steel chemical analysis with sample and finished product chemical composition allowable deviation".
Folding edit this paragraph
3.1, according to the organization performance in the supply of domestic seamless steel tube, a class of ordinary carbon steel according to GB/T700-88 steel manufacturing (but must ensure that sulfur phosphorus content less than 0.050% and less than 0.050%), and its mechanical properties should conform to the GB8162-87 the value stipulated in the table.


3.2, according to the supply water pressure test of domestic seamless steel tube must ensure that the standard prescribed by the hydraulic pressure test.


3.3, imported and the physical properties of the seamless tube inspection on this standard stipulated in the contract.


2, use 2.1, seamless tube, use very extensive.General-purpose seamless tube by ordinary carbon structural steel and low alloy steel or alloy structural steel rolling, most production, mainly used for conveying fluid pipe or structural components.


2.2, is divided into three categories according to utility supply: a, according to the chemical composition and mechanical properties of supply;B, according to the mechanical properties of supply;C, according to the supply water pressure test.According to a, b supply steel pipe, such as used for liquid under pressure, also must carry on the hydraulic pressure test.


2.3, the special use of seamless steel tube boiler seamless steel pipe, seamless tube used in geological and seamless tube used in oil, etc.


3, type


3.1, seamless steel pipe according to the different production methods can be divided into hot rolling pipe, cold rolled, cold drawn tubes, extruded tube, etc.


3.2, according to the shape classification has a circular tube, special-shaped tube.Abnormity tube in addition to the square tube and rectangular tube, oval tube, round tube, triangular tubes, hexagonal tubes, TuZiXing pipe, plum flower form, etc.


3.3, according to the different material, can be divided into ordinary carbon structural tube, low alloy tube structure, high quality carbon structural tube, the structure of the alloy tube, stainless pipe, etc.


3.4, according to the special purpose, such as boiler pipe, geological and oil pipeline.


The working process
Seamless tube process


Seamless steel tube billet heating - inspection - skin - - - perforation, pickling, grinding, dry lubrication, welding head, cold drawing, solid solution treatment, pickling, pickling passivation - inspection - cold rolled - oil - cutting head - dry - polishing, polishing, inspection, identification, finished product packaging

 

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