JIS G3462 Stba20 Seamless Steel Boiler/Heat Exchanger Tube

JIS G3462 Steel Tube

JIS G3462 Steel Tube is used in high-temperature applications such as boilers and heat exchangers.

JIS G3462 Steel Tube is a standard specification for alloy steel tubes intended for use in boilers, heat exchangers, and other high-temperature applications. The specification was established by the Japanese Industrial Standard (JIS) and outlines the requirements for alloy steel tubes used for exchanging heat both inside and outside of the tube.

The JIS G3462 standard specifies several grades of alloy steel tubes, including STBA12, STBA13, STBA20, and STBA22. These tubes are typically produced in seamless form, although electric resistance welded options are also available.

JIS G3462 steel tubes can also be used as components of fired heaters. Other standards that are compatible with JIS G3462 include DIN 17175-79, which covers electrical resistance or induction welded steel tubes for elevated temperature.

JIS G3462 Steel Tube is an important standard for the manufacture of alloy steel tubes, especially those used in high-temperature applications such as boilers and heat exchangers.

Classification and symbols

Tubes shall be classified into grades, and the designation of grade and designation of manufacturing method shall be as given in table 1

Table 1 Designation of grade, designation of manufacturing method and marking

Manufacturing method

The manufacturing method shall be as follows.

(a)Tubes shall be manufactured by a combination of the manufacturing method and finishing method given in table 1
(b)The tubes of STBA 12, STBA 13, STBA 20 and STBA 22 shall be manufactured by seamless process or by electric resistance welding process and the tubes of STBA 23, STBA24, STBA 25 and STBA 26 shall be manufactured by seamless process.
(c)Tubes shall be subjected to the Heat treatment specified in table 22.Other heat treatments not specified in table 2 shall be agreed between the purchaser and the manufacturer.
(d) Plain end finishing shall be applied to the shape of tube end unless otherwise specified.

Table 2 Heat treatment

JIS G3462 specifies the alloy boiler steel tubes used for exchanging heat on the inside and outside of the tube, with 8 steel grades from STBA12-STBA26, it has the similar application as JIS G3461, steel tube of this specification could be supplied as U tube. However, it is not applicable to the steel tubes for heating furnace and those for heat exchangers of low temperature service. For final product, heat treatment of the bent portion is not usually performed. However, if there is a request from the orderer, agreement on heat treatment. Sunny Steel is an experienced boiler and pressure steel tube supplier which can offer you JIS G3462 steel tube of all grade and dimension range.

Chemical Compositions(%) of JIS G3462

Note:

OD refers to the outside diameter.

The above table is only applicable for heat exchanger alloy steel pipes. The buyer can appoint the upper limit value of tensile strength. The upper limit value of tensile strength is the above shown value plus 147 N/mm2.

For the alloy steel tube with the thickness of less than 8 mm, we use NO.12 sample for tensile test. The minimum elongation will be reduced by 1.5% from the table value when the thickness reduces 1 mm. The value obtained will be rounded to an integer value according to JIS Z 8401 (a rounding method). When we take the electric resistance welded steel pipes for tensile test, we also choose NO.12 sample from the parts not containing welding seams.

Mechanical proerties of JIS G3462

Packing: Bare/bundles/crates/crate protection at the both sides of tubes or as per customers’ requirements.
Painting: as requested.

The tubes shall be manufactured by seamless process, electric resistance welding process, or butt welding process, and those of other grades shall be manufactured by seamless process or electric resistance welding process. The tube shall be as manufactured or as cold-finished condition, or they shall be subjected to appropriate heat treatment.

The tubes shall be practically straight. and the two ends shall be at right angles to the axis of the tube. The tubes shall be free from defects detrimental to practical use.

Higher temperature resistance or capacity corrosion, end up being widely used by petroleum, chemical engineering, boiler, heat exchanger and other power areas. JIS G3462 alloy steel tube is not applicable for heating furnaces and heat exchangers for low temperature service.

Size Array of JIS G3462 Alloy Steel Pipe

· Outer dimension is from 19.05 mm to 168.3 mm.

· Wall thickness ranges from three.0 mm to 14 mm.

· The particular length of such alloy steel tube is 19000 millimeters.

Equivalent steel grade of JIS G3462

Heat treatment of JIS G3462

Advantages

JIS G3462 regulates the allowable size deviation of alloy steel pipes, but JST advanced rolling technology can effectively lessens the deviation range and inside the dimension of alloy steel tube better. We may also supply other sizes of pipes solution . customers’ requirements, but ought to ensure these alloy steel pipes pursue IS G3462 standards.

In production process, there always exists flaw, scar, wrinkling, laceration, rolling burr and other defects on alloy steel tube. JST configures UNICORN ultrasonic joint inspection machine, automatic ultrasonic testing equipment, magnetic flux inspection machine and other styles of inspection machines. They can test our alloy steel pipes.

JST also employs professional surface inspectors who’s able to test the inconspicuous defects on the lining and outside surface of alloy steel tubes. As mentioned by the defect characteristics, perform polishing, removal, repair when a series of processes.

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