JIS G3462

JIS G3462 is a standard specification for alloy steel tubes intended for use in boilers, heat exchangers, and other high-temperature applications.

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JIS G3462 is a Japanese Industrial Standard that covers the specifications for alloy steel tubes used for exchanging heat on the inside and outside of the tube in high-temperature applications such as boilers, heat exchangers, and fired heaters. The standard specifies several grades of alloy steel tubes, including STBA12, STBA13, STBA20, and STBA22. The U-bend tubes made from cold-bending process also comply with the standard, with specific requirements for bending radius and heat treatment. JIS G3462 is an important standard for the manufacture and use of alloy steel tubes in high-temperature applications, especially in industries that require reliable and efficient heat transfer.

Scope

This Standard specifies the alloy steel tubes (hereafter referred to as "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 of boilers, and heat exchanger tubes, condenser tubes and catalyst tubes used in chemical and petroleum industries.It is not applicable to the steel tubes for heating furnace and steel heat exchanger tubes for low temperature service.

This Standard applies to tubes with an outside diameter of 15.9 mm. to 139.8 mm.
With the preyious agreement of the  manufacturer, the purchaser may designate the  special quality requirements and designate U-bend tubes to be applied,given in Annex JA and Annex JBA respectively in addition to the requirements specified .in the. text of this Standard.

NOTE: The International Standards corresponding to this Standard and the symbol of degree of correspondence are as follows:
ISO 9329-2 : 1997 Seamless steel tubes for pressure purposes - Technical delivery conditions - Part 2 : Unalloyed and alloyed steels with specified eleva ted tempera ture properties ISO 9330-2 : 1997 Welded steel tubes for pressure purposes - Technical delivery conditions - Part 2 : Electric resistance and induction welded unalloyed and alloyed steel tubes with specified elevated temperature properties (overall evaluation: MOD)The symbols which denote the degree of correspondence in the contents between the relevant International Standards and JIS are IDT (identical), MOD (modified), and NEQ (not equivalent) according to ISO/lEe Guide 21-1.

Normative references

The following standards contain provisions which, through reference in this text,constitute provisions of this Standard. The most recent editions of the standards (including amendments) indicated below shall be applied.

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

Designation of grade Designation of manudacturing method
Tube manufacturing method Finishing method Marking
Molybdenum steel tube STBA12 Seamless: S
Electric resistance welded: E
Hot finished: H
Cold finished : C
As electric resistance welded: G
Designation of manudacturing method shall be in accordance with 12 b).
STBA13
Chromium -molybdenum  steel tube STBA20
STBA22
STBA23
STBA24
STBA25 Seamless: S Hot finished: H
Cold finished : C
STBA26

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

Designation of grade Heat treatment a)
STBA12
STBA13
Low temperature annealing, isothermal annealing, full annealing,normalizing or normalizing followed by tempering
STBA20
STBA22
Low temperature annealing, isothermal annealing, full annealing or normalizing followed by tempering
STBA23
STBA24
STBA25
STBA26
Isothermal annealing, full annealing or normalizing followed by tempering b)
Notes
a) Low temperature annealing shall not be applied to the electric resistance
welded steel tube.
b)The tempering temperature for STBA 23, STBA 24, STBA 25 and STBA 26
shall be 650°C or higher.

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

Grade C Mn P S Si Cr Mo
STBA12 0.10-0.20 0.30-0.80 ≤0.035 ≤0.035 0.10-0.50 0.45-0.65
STBA13 0.15-0.25 0.30-0.80 ≤0.035 ≤0.035 0.10-0.50 0.45-0.65
STBA20 0.10-0.20 0.30-0.60 ≤0.035 ≤0.035 0.10-0.50 0.05-0.08 0.45-0.65
STBA22 ≤0.15 0.30-0.60 ≤0.035 ≤0.035 ≤0.50 0.08-1.25 0.45-0.65
STBA23 ≤0.15 0.30-0.60 ≤0.030 ≤0.030 0.50-1.00 1.00-1.50 0.45-0.65
STBA24 ≤0.15 0.30-0.60 ≤0.030 ≤0.030 ≤0.50 1.90-2.60 0.87-1.13
STBA25 ≤0.15 0.30-0.60 ≤0.030 ≤0.030 ≤0.50 4.00-6.00 0.45-0.65
STBA26 ≤0.15 0.30-0.60 ≤0.030 ≤0.030 0.25-1.00 8.00-10.0 0.90-1.10

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 proertiesof JIS G3462

Grade Tensile Strength (Mpa) Yield Strength
(Mpa)
Elongation
(%)
STBA12 ≥382 ≥206 ≥30
STBA13 ≥412 ≥206 ≥30
STBA20 ≥412 ≥206 ≥30
STBA22 ≥412 ≥206 ≥30
STBA23 ≥412 ≥206 ≥30
STBA24 ≥412 ≥206 ≥30
STBA25 ≥412 ≥206 ≥30
STBA26 ≥412 ≥206 ≥30

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

Equivalent steel grade of JIS G3462

KS ASTM JIS DIN BS
Grade number Grade Grade number GRADE Grade number Grade Grade number Grade Grade number
D 3572 STHA12 A161 T1 JIS G3462 STBA12 17175 15Mo 3 -
A209 T1
STHA13 A209 T1a STBA13 - - - -
STHA20 A213 T2 STBA20 - - - -
STHA22 A213 T12 STBA22 17175 13Cr Mo 44 3059  S1 620
S2 620
ERW620
CEW620
STHA23 A199 T11 STBA23 - - - -
A200 T11
A213 T11
STHA24 A199 T22 STBA24 17175 10Cr Mo910 3059 S1 622-440
A200 T22 S2 622-440
A213 T22
STHA25 A199 T5 STBA25 - - - -
A200 T5
A210 T5
STHA26 A199 T9 STBA26 - - - -
A200 T9
A213 T9

Heat treatment of JIS G3462

Symbol of class JIS G3462 Heat treatment
STBA 12
STBA 13
Low temperature annealing, isothermal annealing, full annealing, normalizing or normalizing followed by tempering
STBA 20
STBA22
Low temperature annealing, isothermal annealing, full annealing, normalizing or normalizing followed by tempering
STBA23
STBA 24
STBA 25
STBA 26
Isothermal annealing, full annealing or normalizing followed by tempering

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.

JIS G3461 Carbon Steel Pipes Dimensions Tolerance

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.  

JIS G3461 Carbon Steel Pipes Dimensions Tolerance

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.  

【H】 Ceramic lined pipe

Ceramic lined pipe is made through self-propagating high-temperature synthesis (SHS) technique.

【H】 Cast basalt lined steel pipe

Cast basalt lined steel pipe is composed by lined with cast basalt pipe, outside steel pipe and cement mortar filling between the two layers.

【H】 Ceramic Tile Lined Pipes

Ceramic tile lined pipes have very uniform coating of specially formulated ceramic material that is affixed to the inner of the pipe.

【H】 Rare earth alloy wear-resistant pipe

The material of the rare earth alloy wear-resistant pipe is ZG40CrMnMoNiSiRe, which is also the grade of rare earth alloy steel.

【H】 Tubes Erosion Shields

Tubes Erosion Shields are used to protect boiler tubing from the highly erosive effects of high temperatures and pressures thereby greatly extending tube life.

【H】 ASTM A213 T91 Alloy Tube

The ASTM A213 T91 seamless tubes are primarily used for boiler, superheater, and heat-exchanger.

Ni-Hard Wearback Pipes Ni-Hard Wearback Pipes
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