JIS G3461 STB340 Boiler and Heat Exchanger Tubes

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JIS G3461 STB 340 Boiler and Heat Exchanger Tubes are manufacture by Seamless , Electric resistance welded.The cold finished electric resistance welded steel tube which has been normalized prior to cold finishing may be finished by annealing.

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JIS G3461 STB 340 Boiler and Heat Exchanger Tubes
 
Standard: JIS G3461
Carbon Steel Tubes for Boiler and Heat Exchanger
 
JIS G3461 STB 340 specifies the carbon steel tubes, hereinafter referred to as the "tubes", used for exchanging heat on the inside and outside of the tube, such as water tubes, smoke tubes, superheater tubes, air preheater tubes, etc. of the boiler, and heat exchanger tubes, condenser tubes, catalyzer tubes, etc. used in chemical and petroleum industries.
 
 
JIS G3461 STB 340 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
 

Method of manufacture
Seamless; Electric resistance welded, Cold finished ,Hot finished
 
Heat Treatment of JIS G3461 STB 410

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
Note:The cold finished electric resistance welded steel tube which has been normalized prior to cold finishing may be finished by annealing.
 
 
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
Note:The above table is only applicable for heat exchanger carbon steel tubes. The buyer can appoint the upper limit value of tensile strength. The upper limit value of tensile strength is the above shown value plus 120 N/mm2.

 
The dimensional tolerances of .JIS G3461 Carbon Steel Tubes for Boiler and Heat Exchanger
 
Tolerances of Wall Thickness
Tolerances Division of wall
thickness (mm)		 Division of method of manufacture Hot finished seamless steel tube Cold finished seamless steel tube Electric resistance welded steel tube
Division of outside diameter (mm) Under 100 100 or over Under 40 40 or over Under 40 40 or over
Tolerances on wall thickness % Under 2 --- --- +0.4mm +22



0		 +0.3 +18



0
0 0
2 or over to and excl. 2.4 +40 --- +20



0		 +18



0
0
2.4 or over to or excl. 3.8 +35 +35
0 0
3.8 or over to or excl. 4.6 +33 +33
0 0
4.6 or over +28 +28
0 0
Tolerances  on
thickness disparity%		 --- Within 22.8 of wall thickness --- ---
 
 
Tolerances of  Outside Diameter
Division of outside diameter Tolerances on outside diamete
 Hot finished seamless steel tube Cold finished seamless steel tube Electric resistance welded steel tube other than cold finished Cold  finished  electric resistance welded steel tube
Under 25 +0.4

-0.8		 【0.10 【1.5 【0.10
25 or over to and excl. 40 【0.15 【0.20 【0.15
40or over to and excl. 50 【0.20 【0.25 【0.20
50 or over to and excl 60 【0.25 【0.30 【0.25
60 or over to and excl. 80 【0.30 【0.40 【0.30
80 or over to and excl. 100 【0.40 +0.40 【0.40
-0.60
100 or over to and excl.12 +0.4

-1.2		 +0.40
-0.60		 +0.40
-0.80		 +0.40
-0.60
120 or over to and excl.160 +0.40
-0.80		 +0.40
-1.00		 +0.40
-0.80
160 or over to and excl.200 +0.4 +0.40 +0.40 +0.40
-1.8 -1.20 -1.20 -1.20
200 or over +0.4 +0.40 +0.40 +0.40
-2.4 -1.60 -1.60 -1.60
 
Tolerances of Length
Division Tolerance on length
50 mm or under in
outside diameter		 7 m or under in length +0.7 mm  
0  
Over 7 m in length Add 3 mm to the plus side permissible deviation given above for each increase of 3m or its fraction in length. However, the maximum value shall be 15 mm.  
Over  50  mm  in
outside diameter		 7 m or under in length +10mm  
0  
Over 7 m in length Add 3 mm to the plus side permissible deviation given above for each increase of 3m or its fraction in length. However, the maximum value shall be 15mm.  
 
 
Appearance
（1）The tube are practically straight and its both ends shall be at right angles to its axis.
（2）The inside and outside surfaces of the tube are well-finished and free from defects injurious to use.
 

Testings
(1)Chemical Analysis
(2)Tensile Test
(3)Flattening Test
(4) Flaring Test
(5) Reverse flattening Test
(6)Hydrostatic Test or Nondestructive Examination
 
 
Marking
Each tube having passed the inspection shall be marked with the following items. However, the order of arranging the items is not specified. Further, in the case of either smaller tubs or request from the purchaser, the tubes may be bundled together and marked for each bundle by a suitable means.
 
(1) Class symbol(STB 340)
(2) Letter symbol indication the manufacturing method ()
(3) Dimensions
(4) Manufacturer's name or its abbreviation
(5) Letter symbol Z indicating the designation of special quality requirements
Note () Symbols for indicating the manufacturing method shall be as follows. However, - 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
 

Report
We will, in general, submit to the purchaser a detailed statement of the test results, method of manufacture, ordered dimensions, quantity, work number indicating the history of manufacture, etc.
 
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