Stainless steel pipe is a kind of hollow long round steel, which is mainly widely used in industrial transportation pipelines and mechanical structural components such as petroleum, chemical industry, medical treatment, food, light industry, mechanical instrumentation, etc. In addition, when the bending and torsional strength are the same, the weight is lighter, so it is also widely used in manufacturing mechanical parts and engineering structures. It is also commonly used as furniture, kitchen utensils, etc.
-Classification: Stainless steel pipes are divided into two categories: seamless pipes and welded pipes according to production methods. Seamless steel pipes can be divided into hot-rolled pipes, cold-rolled pipes, cold-drawn pipes and extruded pipes. Cold-drawn and cold-rolled pipes are the secondary processes of steel pipes. Processing; welded pipes are divided into straight seam welded pipes and spiral welded pipes.
-Hardeness Testing: Brinell Hardness; Rockwell Hardness; Vickers Hardness
-Stainless steel pipe implementation standards:
GB/T14976-2012 Stainless steel seamless steel pipes for fluid transportation
(Replace GB/T14976-2002, replace GB/T14976-1994, replace GB2270-1980)
GB/T14975-2012 Stainless steel seamless steel pipes for structural use (replacing GB/T14975-2002)
GB13296-2013 Stainless steel tubes for boiler tubes and heat exchangers
(GJB2608-96) (YB676-73) Aviation structural pipes, thick-walled seamless steel pipes
(GJB2296-95) (YB678-71) Stainless steel pipe for aviation
(YB/T679-97) (YB679-71) 18A hollow rivet thin-walled seamless steel pipe for aviation
(GJB2609-96) (YB680-71) Aviation structural pipes, thin-walled seamless steel pipes
(YB/T681-97) (YB681-71) Aviation conduit 20A thin-walled seamless steel pipe
GB3090-2000 small diameter stainless steel pipe
GB5310-2017 Seamless steel pipe for high-pressure boilers
GB3087-2008 low and medium pressure boiler tubes
GB3089-2008 Stainless acid-resistant extremely thin-walled seamless steel pipe
GB9948-2013 Seamless steel for petroleum cracking
ASTM A213 Ferritic and austenitic alloy tubes for boilers and heat exchangers
ASTM A269 General Purpose Austenitic Stainless Steel Pipe and Welded Pipe
ASTM A312 austenitic stainless steel seamless steel pipe welded steel pipe welded pipe
ASTM A450 General Requirements for Carbon, Ferritic and Austenitic Alloy Steel Pipe
ASTM A530 General Requirements for Ferrous and Alloy Steels for Special Purposes
ASTM A789 General Requirements for Carbonitic Austenitic Stainless Steel Seamless and Welded Steel Pipe
JIS G3456-88 Stainless steel pipes for mechanical structures
JIS G3448-88 Stainless steel pipes for ordinary pipes
JIS G3459-88 Stainless steel pipes for pipelines
JIS G3463-88 Stainless steel tubes for boilers and heat exchangers
Q/HYAD seamless steel pipe for chemical industry
(0Cr18NI11T) Q/HYAD Cr18Ni5MO3Si2 duplex stainless steel seamless steel pipe
-The production process of stainless steel seamless pipes:
a. Round steel preparation;
b. heating;
c. hot rolled perforation;
d. cut off the head;
e. pickling;
f. grinding; grinding
g. lubricating;
h. Cold rolling processing;
i. Skim;
j． Solution heat treatment;
k． straighten; straighten
l． cut pipe;
m. pickling;
n． Product testing
Application:
-Auto industry
Stainless steel is mainly used in exhaust systems. Commonly used steel types include 409L, 436L, etc., which account for more than 1/2 of the total stainless steel used in automobiles, and 80% are ferritic stainless steel.
-Petrochemical industry including fertilizer industry
This industry mainly uses stainless steel seamless pipes, specifications include: 304, 321, 316, 316L, 347, 317L, etc., the outer diameter is around φ18-φ610, and the wall thickness is around 6mm-50mm.
-Fluid transportation such as water and gas
Stainless steel pipelines and their water delivery equipment are the most advanced basic water purification materials in the world today.
-Equipment manufacturing and repair
The annual consumption of stainless steel pipes is more than 20,000 tons. Mainly use sanitary or antibacterial grade stainless steel pipes. Hygienic seamless pipes made of imported SUS304 and 316L.
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