JIS G3462 STBA22 Alloy boiler and heat exchanger tubes
 
Standard:JIS G3462
Alloy steel tubes for boiler and heat exchanger
 
JIS G3462 specifies the alloy steel tubes (hereafter referred to as "tubes") used for exchanging heat between the inside and outside of the tube, such as water tubes,smoke tubes, superheater tubes and air preheater tubes of boilers, and heat exchanger tubes, condenser tubes and catalyst tubes used in chemical and petroleum industries.
 
JIS G3462 STBA22 alloy steel tubes with an outside diameter of 15.9 mm. to 139.8 mm.
 
 
JIS G3462 STBA22 Alloy boiler and heat exchanger tubes Quick Details
Manufacture:Seamless; Electric resistance welded, Cold finished ,Hot finished
Wall thickness(WT): 2.0 mm——12.7 mm.
Outer diameter (OD): 25 mm——139.8 mm
Length: 6M or specified length as required.
Ends: Plain End, Beveled End, Treaded
 
 
Additional Info
Port of Shipment: Tianjin, China
Payment Terms:T / T, LC
Delivery: 7-15 days after payment
Surface: Tubes will be varnished (Outside only) to prevent rust.
Marking: Standard + Steel Grade + Size + Heat No + Lot No
Package: Bundles (hexagonal),Wooden Boxes,Crates (steel/wooden) or as required
 
 
Manufacturing method
(1)JIS G3462 STBA22 Alloy boiler and heat exchanger tubes are manufactured by seamless process or by electric resistance welding process
(2) Plain end finishing are applied to the shape of tube end.
 
 
Heat treatment of JIS G3462 STBA22 Alloy boiler and heat exchanger tubes

 
 
Appearance
a) The tube are practically straight, and the both ends shall be practically perpendicular to the tube axis.
b) The inside and outside surfaces of the tube are finished well without defects detrimental to use. In the case of electric resistance welded steel tube, the swelling of inside surface of the weld shall be 0.25 mm or under. The purchaser may specify the inside swelling to be 0.15 mm or less for tubes of 50.8 mm or under in outside diameter and 3.5 mm or under in wall thickness.
c) The surface of the tube may be repaired by grinding, machining or other methods,provided that the wall thickness after repairing still satisfies the specified tolerance on thickness.
d) The surface of repaired part shall be smooth along the contour of the tube.
 
 
Testings
(1)Chemical analysis
(2)Mechanical test
(3)Tensile test
(4) Flattening test
(5) Flaring test
(6)Reverse flattening test
(7)Hydraulic test or nondestructive test
 
 
Marking
The tubes which have passed the inspection shall be marked with the following items on each tube. However, the order of arranging the items is not specified.
Further, in the case of either smaller tubes or a request from the purchaser, the tubes may be bundled together and marked by a suitable method on each bundle.
Moreover, when approved by the purchaser, part of items may be omitted.
(1) Symbol of class(STBA22 )
(2) Symbol representing the method of manufacture (³)
(3) Dimensions
(4) Manufacturer's name or its abbreviation
(5) Symbol representing the designation of special quality requirements: Z
Note ( 2 )
Symbols representing the methods of manufacture shall be as follows:
However, the sign - may be replaced by a blank.
Hot finished seamless steel tube - S - H
Cold finished seamless steel tube - S -C
Electric resistance welded steel tube other than hot finished and cold finished - E - G
Hot finished electric resistance welded steel tube - E - H
Cold finished electric resistance welded steel tube - E - C
 
 
Test report
We will submit an inspection document to the purchaser
 
 
Photos of JIS G3462 STBA22 Alloy boiler and heat exchanger tubes