Product Description
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.
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
STB340
Chemical composition, standards and properties
| Grade : |
STB340 |
| Classification: |
Structural steel Carbon steel |
| Standards: |
| JIS G 3461 : Carbon steel boiler and heat exchanger tubes |
|
| Applications: |
Carbon steel tubes used for exchanging heat on the inside and outside of the tube, such as water tubes, smoke tubes, superheater tubes and air preheater tubes of the boiler and heat exchanger tubes, condenser tubes and condenser tubes and catalyse |
Chemical composition % of grade STB340
| C |
Si |
Mn |
P |
S |
| max 0.18 |
max 0.35 |
0.3 - 0.6 |
max 0.035 |
max 0.035 |
Mechanical properties of grade STB340
| Assortment |
Yield point or Proof stress |
Tensile strength |
Elongation |
Reduction of area |
Charpy impact strength |
| - |
N/mm 2 |
N/mm 2 |
% |
% |
J/cm 2 |
| Tubes |
175 |
340 |
27-35 |
|
|
Hardness of grade STB340
| - |
Brinell
HBW / HB |
Rockwell C
HRC |
Rockwell B
HRBS / HRB |
Vickers
HV |
| STB340 |
|
|
77 |
|
Density of grade STB340
Compare other grades with grade STB340
STB340
standards |
| JIS G 3461 : Carbon steel boiler and heat exchanger tubes / Compare steels |
|
Detailed Photos
Production process
Equipment
Application
JIS G3461 STB340 used for economizer, heat exchanger and so on.
Economizer tube is an important part of boiler economizer, mainly made of seamless steel tube by bending or folding. The cast iron economizer consists of a series of horizontal cast iron pipes which are flanged at each end with cast iron elbows. The tubular economizer consists of a series of parallel serpentine tubes. The serpentine tubes are made of seamless steel tubes with an outside diameter of 25 ~ 42 mm. The tubes are usually arranged in staggered rows.
Modern large and medium-sized boilers generally use membrane water wall, which is composed of rolled fin tubes, the fins of adjacent tubes are connected, and welded into a whole by electric welding. The advantages of membrane water wall are: good sealing of furnace, reduce air leakage, reduce smoke loss, and facilitate micro-positive pressure combustion; It can fully protect the furnace wall, so the thickness and weight of the furnace wall can be reduced, which is conducive to the use of suspension structure; Can improve the coking situation in the furnace; The pre-combination degree of boiler components is improved and the installation workload can be reduced. Compared with the water wall of the pipe, the heat absorption capacity of the pipe is improved. Therefore, most boilers produced in recent years use film water wall. Membrane water wall requires that the thermal deviation between adjacent pipes should be as small as possible to prevent thermal stress caused by thermal deviation, resulting in pipe damage. In order to withstand deflaring pressure in the furnace or combustion pressure fluctuation in the furnace, resulting in deformation or damage to the structure of the water wall, rigid beams must be arranged in layers around the outside of the furnace wall, so that the whole water wall becomes a rigid whole.
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
Packaging & Shipping
customers
FAQ
Q:How do you control quality?
A:Mill test certification is supplied with shipment,third party inspection is avaliable.
Q:What are the advantages of your company?
A:We have many professionals,technical personnel,more competitive prices and best after-sales service than other stainless steel companies
Q:How many coutries you already exported?
A:Exported to more than 50 countries mainly from Arab, Kuwait, Egypt, Turkey, Jordan, Brazil, India, Indonesia, Korea, etc
Q:Can you provide sample?
A:Small sample in store and can provide the sample for free.Customized samples will take about 5-7days
Q:Why should you buy from us not from other suppliers?
A:Diversified products, direct supply from manufacturer.
Q:What is your terms of payment ?
A:we accept T/T ,L/C ,D/A,D/P, Western union, paypal ,The payment method can be negotiated by both parties according to the actual situation.
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