Stainless Steel Square Tube Round Tube
Stainless steel pipes are divided into two categories: seamless steel pipes and welded steel pipes (seamed pipes). According to the cross-sectional shape, it can be divided into round tubes and special-shaped tubes. Round steel tubes are widely used, but there are also some square, rectangular, semicircular, hexagonal, equilateral triangle, octagonal and other special-shaped steel tubes.
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Product Description

Stainless steel pipe classification

Stainless steel pipes are divided into two categories: seamless steel pipes and welded steel pipes (seamed pipes). According to the cross-sectional shape, it can be divided into round tubes and special-shaped tubes. Round steel tubes are widely used, but there are also some square, rectangular, semicircular, hexagonal, equilateral triangle, octagonal and other special-shaped steel tubes.

For steel pipes under fluid pressure, a hydraulic test is required to check their pressure resistance and quality. It is qualified if no leakage, soaking or expansion occurs under the specified pressure. Some steel pipes also need to be crimped according to standards or requirements , Flaring test, flattening test, etc.


Seamless steel pipe

Because of their different manufacturing processes, they are divided into two types: hot-rolled (extruded) seamless steel pipes and cold-drawn (rolled) seamless steel pipes. Cold drawn (rolled) tubes are divided into two types: round tubes and special-shaped tubes.

A seamless tube is a long strip of steel with a hollow section and no seams around it.

The types of seamless pipes are as follows:

(1) Seamless pipes for general structure and mechanical structure (GB8162-87)

(2) Seamless tubes for low and medium pressure boilers (GB/T3087-1999)

(3) Seamless tube ST45.8/111 for high pressure boiler (GB5310-85)

(4) Seamless pipes for conveying fluids (GB/T8163-1999)

(5) Cold-drawn or cold-rolled precision seamless pipe (GB3639-83)

(6) Steel pipe for geological drilling (YB235-70)

(7) Oil drilling steel pipe (YB528-65)


Standards for stainless steel pipes

GB/T14976-2012 Stainless steel seamless steel tubes for fluid transportation

(replace GB/T14976-2002 replace GB/T14976-1994 replace GB2270-1980)

GB/T14975-2012 Structural stainless steel seamless steel tubes (replace 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 Tubes for High Pressure Boilers

GB3087-2008 low and medium pressure boiler tube

GB3089-2008 Stainless steel 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 Austenitic stainless steel pipe and welded pipe for general purposes

ASTM A312 Austenitic Stainless Steel Seamless Steel Tube Welded Steel Tube Welded Pipe

ASTM A450 General Requirements for Carbon Steel, Ferritic and Austenitic Alloy Steel Pipe

ASTM A530 General requirements for ferritic and alloy steels for special purposes

ASTM A789 General Requirements Carbonitic Austenitic Stainless Steel Seamless and Welded Steel Tubes

JIS G3456-88 Stainless Steel Tubes for Mechanical Structures

JIS G3448-88 Stainless steel pipes for ordinary pipelines

JIS G3459-88 stainless steel pipes for pipelines

JIS G3463-88 Stainless steel tubes for boilers and heat exchangers

Q/HYAD chemical seamless steel pipe

(0Cr18NI11T) Q/HYAD Cr18Ni5MO3Si2 duplex stainless steel seamless steel pipe

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