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Seamless stainless steel tubes for boiler and heat exchanger
Seamless Stainless Steel tubes For Boiler and Heat Exchanger, made according to the Chinese National Standard GB13296-91.
GB13296-91 is a standard applicable for Seamless Stainless Steel pipes which is used for boiler and heat exchanger.
GB13296-1991 Seamless Stainless Steel Tubes for Boiler, Heat Exchangers
0Cr18Ni9 1Cr18Ni9Ti 0Cr18Ni12Mo2Ti
Standard: GB13296-91
Bending tolerance:
WTâ‰Â¤15mm, Bendingâ‰Â¤1.5mm/m
WT＞15mm, Bendingâ‰Â¤2.0mm/m
End shape:
Both ends of the pipe should be cut at right angles, and remove burrs
Tests of the seamless boiler tubes:
1.Bending Test:
The tubes should take the bending test when OD â‰Â¤22mm. The bending angle is 90 degrees, and the bending radius is 6 times the outer diameter of the steel tube.
2. Hydraulic test;
Eddy current testing, ultrasonic testing can be used instead of hydraulic tests. When eddy current testing, GB/T 7735-1995 Gr. A should be followed; when ultrasonic testing, GB/T 5777-1996 Gr. C8 should be followed.
3. Flattening test
4. Flanging test
5. Expand test
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