JIS G3461 Carbon Steel Tubes for boiler and heat exchanger
- Model
- JIS G3461
Item specifics
- Type
- Hot Rolled / Cold Drawn
- Delivery Condition
- As Rolled, Cold Drawn, Normalizing Rolled
Review
Description
JIS G3461 Carbon steel tubes for boiler and heat exchanger
JIS G3461 carbon 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, etc. of boilers, and heat exchanger tubes, condenser tubes and catalyser tubes, etc. used in chemical and petroleum industries. It is not applicable to the steel tubes for fired heater and steel heat exchanger tubes for low temperature service.
JIS G3461 Carbon steel tubes dimensional and tolerances
outside diameters: 15- 150mm
wall thicknesses: 1-15mm
dimensional tolerances: +/-1% OD ; +/- 12% WT
JIS G3461 Carbon steel tubes Manufacturing method
The manufacturing method shall be as follows.
Tubes shall be manufactured from the killed steel and by a combination of the tube manufacturing method and the finishing method.
Seamless: S
Electric resistance welded: E
Hot-finished: H
Cold-finished: C
As electric resistance welded: G
JIS G3461 Carbon steel tubes Chemical composition
Symbol | C | Si | Mn | P | S |
STB340 | 0.18 max. | 0.35 max. | 0.30 to 0.60 | 0.035 max. | 0.035 max. |
STB410 | 0.32 max. | 0.35 max. | 0.30 to 0.80 | 0.035 max. | 0.035 max. |
STB510 | 0.25 max. | 0.35 max. | 1.00 to 1.50 | 0.035 max. | 0.035 max. |
JIS G3461 Carbon steel tubes Mechanical properties
Symbol of grade | Tensile strength | Yield point or proof stress | Elongation % | ||
Outside diameter | |||||
Under 10 mm | 10 mm or over to and excl. 20 mm | 20 mm or over | |||
Test piece | |||||
Test piece No. 11 | Test piece No. 11 | Test piece No. 11 Test piece No. 12 | |||
Tensile test direction | |||||
N/mm2 | N/mm2 | Parallel to tube axis | Parallel to tube axis | Parallel to tube axis | |
STB340 | 340 min. | 175 min. | 27 min. | 30 min. | 35 min. |
STB410 | 410 min. | 255 min. | 17 min. | 20 min. | 25 min. |
STB510 | 510 min. | 295 min. | 17 min. | 20 min. | 25 min. |
JIS G3461 Carbon steel tubes Heat treatment
Normalizing
Low temperature annealing
full annealing
JIS G3461 Carbon steel tubes Appearance
The appearance shall be as follows.
a) Tubes shall be straight for practical purposes with both ends at right angles to thetube axis.
b) The inside and outside surfaces of tubes shall be finished smoothly and free from defects detrimental to use. For the electric resistance welded steel tubes, the convex on inside surface of the weld shall be 0.25 mm or under.
c) The surfaces of tubes may be repaired by grinding, machining or other methods, provided that the wall thickness after repair is within the specified tolerance on wall thickness.
d) The surface of the repaired part shall be smooth along the contour of the tube.
JIS G3461 Carbon steel tubes Tests and Inspection
Chemical analysis
Mechanical tests
Tensile test
Flattening test
Bend test
Hydrostatic test
Non-destructive test
