First, the classification and characteristics of stainless steel pipes
1. Classified by production method
(1) Seamless pipe - cold drawn pipe, extruded pipe, cold rolled pipe
Stainless steel seamless pipe
The stainless steel seamless pipe is a long strip of steel with a hollow section and no seams around it.
â—† Seamless steel pipe manufacturing process and process
Smelting>steel ingot>rolling steel>saw cutting>peeling>perforation>annealing>pickling>ashing>cold drawing>cutting head>pickling>into the warehouse
â—† Features of seamless steel pipe
From the above process, we can easily see that: First, the thicker the wall thickness of the product, the more economical and practical it is, the thinner the wall thickness, the higher the processing cost will be; secondly, the The process of the product determines its limitations. Generally, the seamless steel pipe has low precision: uneven wall thickness, low brightness inside and outside the pipe, high fixed-length cost, and pitting and black spots on the inside and outside, and its black point is not easy to remove; Detection and shaping must be processed offline. Therefore, it embodies its superiority in high-pressure, high-strength, mechanical structural materials.
(2) welded pipe
(a) Classification by process - gas shielded pipe, arc welded pipe, electric resistance welded pipe (high frequency, low frequency)
(b) According to the weld seam - straight seam welded pipe, spiral welded pipe
Stainless steel welded steel pipe
Welded steel pipe is referred to as welded pipe, which is a steel pipe made by welding a steel plate or a steel belt through a unit and a die.
â—† Manufacturing process and process of welded steel pipe
Steel plate>Split>Molding>Solution>Induction bright heat treatment>Internal and external weld bead treatment>Shaping>Sizing>Vortex detection>Laser diameter measurement>Pickling>Warehousing
â—† Characteristics of welded steel pipe
From the above process, we can easily see that: First, the product is continuously produced online, the thicker the wall thickness, the greater the investment of the unit and the welding equipment, the less economical and practical it is. The thinner the wall thickness, the lower the input-output ratio will be. Secondly, the process of the product determines its advantages and disadvantages. Generally, the welded steel pipe has high precision, uniform wall thickness, and high brightness inside and outside the pipe (the steel pipe is determined by the surface grade of the steel plate). Surface brightness), can be arbitrarily fixed. Therefore, it demonstrates its economy and aesthetics in high-precision, medium- and low-pressure fluid applications.
2, according to the shape of the section
(1) Round steel pipe
(2) rectangular tube
3, according to wall thickness classification
(1) Thin-walled steel pipe
(2) Thick-walled steel pipe
4, by purpose
(1) Civilian pipes: split pipes, rectangular pipes, and flower pipes, generally used for decoration, construction, structure, etc.;
(2) Industrial pipes: steel pipes for industrial piping, steel pipes for general piping (drinking water pipes), mechanical structures/fluid conveying pipes, boiler heat exchange pipes, food sanitary pipes, etc. Generally used in various fields of industry such as: petrochemical, paper, nuclear, food, beverage, pharmaceutical and other industries have higher requirements for fluid media.
Second, stainless steel pipe weight and price calculation method
1, the theoretical weight of stainless steel pipe: W = outer diameter - wall thickness x wall thickness x0.02491 stainless steel pipe calculation method outer diameter - wall thickness x wall thickness x0.02491.
Stainless steel tube weight calculation formula
Steel pipe 0Cr18Ni9 00Cr19Ni10 7.93 m (Kg) = 0.02491 t (Dt)
SUS304 SUS304L
TP304 TP304L
0Cr17Ni2Mo2 00Cr17Ni14Mo2 7.98 m (Kg) = 0.02507 t (Dt)
2, stainless steel pipe price calculation formula
(tube billet price / discount rate + processing fee + profit) * tax
(2*width+2*height)*thick*length*density/1000000=1 square tube weight
Stainless steel welded pipe price = material price * (1 + loss) + processing fee + profit
Third, the chemical composition of stainless steel pipe
Grade chemical composition
CSiMnPSNiCrMoTi
≤
0Cr18Ni90.07120.0350.38.00-11.0017.00-19.00//
0Cr25Ni200.08120.0350.0319.00-22.0024.00-26.00//
0Cr18Ni10Ti0.08120.0350.039.00-12.0017.00-19.00/>5×C%
00Cr17Ni14Mo20.03120.0350.0312.00-15.0016.00-18.002.00-3.00/
0Cr18Ni12Mo2Ti0.08120.0350.0311.00-14.0016.00-19.001.80-2.505×C% -0.70
1Cr18Ni9Ti0.12120.0350.038.00-11.0017.00-19.00/5(C%-0.02)-0
Fourth, stainless steel pipe implementation standards
GB2270-80 stainless steel seamless steel pipe
GB/T14976-94 stainless steel seamless pipe for fluid transportation
GB/T14975-94 stainless steel seamless steel pipe for structure
GB13296-91 Stainless steel seamless steel pipe for boilers and heat exchangers
(GJB2608-96)(YB676-73) Structural steel thick-walled seamless steel pipe for aviation
(GJB2296-95)(YB678-71) Aerospace stainless steel seamless pipe
(YB/T679-97)(YB679-71) 18A hollow rivet thin-walled seamless steel pipe for aviation
(GJB2609-96)(YB680-71) Thin-walled seamless steel pipe for aviation
(YB/T681-97)(YB681-71) Aeronautical conduit 20A thin-walled seamless steel pipe
GB3090-82 stainless steel small diameter steel pipe
GB5310-95 seamless steel pipe for high pressure boiler
GB3087-82 low and medium pressure seamless steel pipe
GB3089-92 stainless acid and acid resistant thin wall seamless steel pipe
GB9948-88 petroleum cracking seamless steel pipe
ASTM A213 Ferritic and austenitic alloy steel seamless tubes for boilers and heat exchangers
ASTM A269 General purpose austenitic stainless steel seamless steel pipe and welded steel pipe
ASTM A312 austenitic stainless steel seamless steel pipe welded steel pipe welded steel pipe
General requirements for ASTM A450 carbon steel, ferritic and austenitic alloy steel tubes
General requirements for ASTM A530 special purpose ferritic and alloy steels
ASTM A789 generally requires carbon austenitic stainless steel seamless steel tubes and welded steel tubes
JIS G3456-88 Stainless steel tube for mechanical structure
JIS G3448-88 Stainless steel pipe for ordinary pipes
JIS G3459-88 stainless steel pipe for pipes
JIS G3463-88 Stainless steel tube for boilers and heat exchangers
Q/HYAD 101-91 Seamless long steel pipe for chemical industry
(0Cr18NI11T) Q/HYAD 103-91 00Cr18Ni5MO3Si2 duplex stainless steel seamless pipe
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