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Categories：Steel tubes
Model No.:JIS G3462
Delivery Condition：As Rolled, Cold Drawn, Normalizing Rolled
the alloy steel 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. It is not applicable to the steel tubes for heating furnace and steel heat exchanger tubes for low temperature service .
Outside diameter:10-200 mm
Wall thickness: 1-20mm
Length: 7meter or under/over
Hot finished OD tolerance: +0.4/-0.8mm
Cold finished OD tolerance: +/-0.1mm
Hot finished WT tolerance: +30/-0%
Cold finished WT tolerance: +20/-0%
The U-bend tubes shall be made by cold-bending process, and the bending radius shall be at least 1.5 times the outside diameter of the tube.
The bent portion of the tube shall not be heat treated in general. When required by the purchaser, the heat treatment may be agreed between the purchaser and the manufacturer.
Designation of grade | Designation of manudacturing method | ||
Tube manufacturing method | Finishing method | ||
Molybdenum steel tube | STBA12 | Seamless : S Electric resistance welded : E | Hot finished : H Cold finished : C As electric resistance welded : G |
STBA13 | |||
Chromium-molybdenum steel tube | STBA20 | ||
STBA22 | |||
STBA23 | |||
STBA24 | |||
STBA25 | Seamless : S | Hot finished : H Cold finished : C | |
STBA26 | |||
Designation of grade | C | Si | Mn | P | S | Cr | Mo |
STBA12 | 0.10 to 0.20 | 0.10 to 0.50 | 0.30 to 0.80 | 0.035 max. | 0.035 max. | — | 0.45 to 0.65 |
STBA13 | 0.15 to 0.25 | 0.10 to 0.50 | 0.30 to 0.80 | 0.035 max. | 0.035 max. | — | 0.45 to 0.65 |
STBA20 | 0.10 to 0.20 | 0.10 to 0.50 | 0.30 to 0.60 | 0.035 max. | 0.035 max. | 0.50 to 0.80 | 0.40 to 0.65 |
STBA22 | 0.15 max. | 0.50 max. | 0.30 to 0.60 | 0.035 max. | 0.035 max. | 0.80 to 1.25 | 0.45 to 0.65 |
STBA23 | 0.15 max. | 0.50 to 1.00 | 0.30 to 0.60 | 0.030 max. | 0.030 max. | 1.00 to 1.50 | 0.45 to 0.65 |
STBA24 | 0.15 max. | 0.50 max. | 0.30 to 0.60 | 0.030 max. | 0.030 max. | 1.90 to 2.60 | 0.87 to 1.13 |
STBA25 | 0.15 max. | 0.50 max. | 0.30 to 0.60 | 0.030 max. | 0.030 max. | 4.00 to 6.00 | 0.45 to 0.65 |
STBA26 | 0.15 max. | 0.25 to 1.00 | 0.30 to 0.60 | 0.030 max. | 0.030 max. | 8.00 to 10.00 | 0.90 to 1.10 |
G3462 Alloy Steel Tubes Heat treatment
Designation of grade | Heat treatment |
STBA12 STBA13 | Low temperature annealing, isothermal annealing, full annealing, normalizing or normalizing followed by tempering |
STBA20 STBA22 | Low temperature annealing, isothermal annealing, full annealing or normalizing followed by tempering |
STBA23 STBA24 STBA25 STBA26 | Isothermal annealing, full annealing or normaHzing followed by tempering |
Notes a) Low temperature annealing shall not be applied to the electric resistance welded steel tube. b) The tempering temperature for STBA 23, STBA 24, STBA 25 and STBA 26 shall be 650 °C or higher. | |
The appearance of tubes shall be as follows.
a) The tube shall be practically straight, and the both ends shall be practically perpendicular to the tube axis.
b) The inside and outside surfaces of the tube shall be 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.
Chemical analysis
Mechanical test
Hydraulic test or nondestructive test
Each tube which passed the inspection shall be marked with the following items. Tubes may be bundled together and marked for each bundle by a suitable means, when required by the manufacturer or when the small outside diameter of the tubes is an obstacle to marking on each tube. The arrangement of items is not specified.
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