JIS G3461 STB 340 carbon steel pipes for boilers and heat exchangers

 STB 340 pipes comply with JIS G3461 standards and can be used as boiler pipes, heat exchangers and pressure vessel pipes, etc., to transport high-temperature gases and liquids.

We can perform resistance welding, cold processing, hot processing and other processing on STB 340 seamless pipes. The size range of STB 340 grade boiler pipes:
Wall thickness (WT): 2.0mm—12.7mm
Outer diameter (OD): 25mm—139.8mm
Length: 6M
Sizes can also be customized according to specific conditions of use.

Heat Treatment of JIS G3461 STB 340

Grade
Heat treatment
Hot finished seamless steel tube
Cold finished seamless steel tube
Electric resistance welded steel tube other than hot finished or cold finished steel tube
Finished electric resistance welded steel tube
Fold  finished  electric resistance welded steel tube
STB 340
As manufactured, as required, low temperature  annealing  or normalizing may be performed.
Low temperature
annealing,normalizing or full annealing.
Normalizing
As manufactured. However, as required, low temperature  annealing  or normalizing may be performed
Normalizing

Chemical Composition of JIS G3461 STB 340

Standard
Grade
Chemical Composition Limits (%)
C
Si
Mn
P
S
JIS G3461
STB 340
≤ 0.18
≤ 0.3
0.30-0.60
≤ 0.035
≤ 0.035

Mechanical Properties of JIS G3461 STB 340

Grade
Tensile Property (N/mm2)
Yield Point or Yield Strength (N/mm2)
Rockwell hardness HRB
Elongation (%)
OD ≥20 mm
10 mm ≤OD ＜20 mm
OD ＜10 mm
Longitudinal
Transverse
Transverse
STB 340
≥ 340
≥ 175
 
77 max.
≥ 35
≥ 30
≥ 27

The delivery state of STB 340 seamless pipe can be annealed, normalized, normalized and tempered. The pipe end is generally flat or inclined. If the customer has other requirements, it can also be satisfied. In order to prevent the pipe from rusting, we generally turn it to The surface is coated with a coat of varnish and packed in hexagonal bundles, boxes or upon request.

If you want carbon high temperature boiler pipes, we will recommend you to choose STB 340 or STB 410 grade, if you want the latest quotation, we can help you.


From:http://boilersteelpipe.com/pro/smls/jis-g3461-stb-340-carbon-steel-pipes-for-boilers-and-heat-exchangers.html

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