JIS G3462 Alloy Steel Boiler And Heat Exchanger Tubes
JIS G3462 Alloy steel boiler and heat exchanger tubes
Standard: JIS G3462
Application scope
JIS G3462 Alloy Steel Tubes are mainly used for exchanging heat on within and in the vicinity of the underground. It can use as water tube, smoke tube, superheated tubes, air preheater tube, etc.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.
Main grades
JIS G3462 Alloy steel boiler and heat exchanger tubes shall be classified into eight grades,
Such as STBA 12, STBA 13, STBA 20, STBA 22, STBA 23, STBA 24, STBA 25, STBA 26, etc.
Such as STBA 12, STBA 13, STBA 20, STBA 22, STBA 23, STBA 24, STBA 25, STBA 26, etc.
Method of Manufacture
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.
STBA 25 and STBA 26 shall be manufactured by seamless process.
The tube shall be subjected to heat treatments
| grade | Heat treatment |
| STBA 12 | Low temperature annealing, isothermal annealing, full annealing, normalizing or normalizing followed by tempering |
| STBA 13 | |
| STBA 20 | Low temperature annealing, isothermal annealing, full annealing, normalizing or normalizing followed by tempering |
| STBA 22 | |
| STBA 23 | Isothermal annealing, full annealing or normalizing followed by tempering |
| STBA 24 | |
| STBA 25 | |
| STBA 24 |
Remark
1. Low temperature annealing shall not be applied to the electric resistance welded steel tube.
2. The tempering temperature for STBA 23, STBA 24, STHA 25 and STBA 26 shall be 650˚ or higher
JIS G3462 Alloy steel boiler and heat exchanger tubes Quick Details
Type:Seamless Steel Pipe.
Material: STBA12, STBA13, STBA20, STBA22, STBA23, STBA24, STBA25, STBA26, etc.
Wall thickness(WT): 3.2mm——14 mm.
Outer diameter (OD): 19.05mm——168.3 mm
Length: 6M or specified length as required.
Ends: Plain End, Beveled End, Treaded
FOB Price: US $1000-2000 / Ton | 1 Ton/Tons (Min. Order)
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:Standard export package,suit for all kinds of transport, or as required
Chemical Composition of JIS G3462 Alloy steel boiler and heat exchanger tubes (Unit: %)
| Standard | Grade | Chemical Composition Limits (%) | ||||||
| C | Si | Mn | P | S | Cr | Mo | ||
| JIS G3462 | STBA12 | 0.10-0.20 | 0.10-0.50 | 0.30-0.80 | ≤ 0.035 | ≤ 0.035 | - | 0.45-0.65 |
| STBA13 | 0.15-0.25 | 0.10-0.50 | 0.30-0.80 | ≤ 0.035 | ≤ 0.035 | - | 0.45-0.65 | |
| STBA20 | 0.10-0.20 | 0.10-0.50 | 0.30-0.60 | ≤ 0.035 | ≤ 0.035 | 0.050-0.080 | 0.45-0.65 | |
| STBA22 | ≤ 0.15 | ≤ 0.50 | 0.30-0.60 | ≤ 0.035 | ≤ 0.035 | 0.80-1.25 | 0.45-0.65 | |
| STBA23 | ≤ 0.15 | 0.50-1.00 | 0.30-0.60 | ≤ 0.030 | ≤ 0.030 | 1.00-1.50 | 0.45-0.65 | |
| STBA24 | ≤ 0.15 | ≤ 0.50 | 0.30-0.60 | ≤ 0.030 | ≤ 0.030 | 1.90-2.60 | 0.87-1.13 | |
| STBA25 | ≤ 0.15 | ≤ 0.50 | 0.30-0.60 | ≤ 0.030 | ≤ 0.030 | 4.00-6.00 | 0.45-0.65 | |
| STBA26 | ≤ 0.15 | 0.25-1.00 | 0.30-0.60 | ≤ 0.030 | ≤ 0.030 | 8.00-10.00 | 0.90-1.10 | |
Mechanical Properties of Alloy steel boiler and heat exchanger tubes
| Grade | Tensile Property (N/mm2) | Yield Point or Yield Strength (N/mm2) | Elongation (%) | ||
| OD ≥ 20 mm | 10 mm ≤ OD ＜20 mm | OD ＜10 mm | |||
| NO. 11 Sample; NO. 12 Sample | NO. 11 Sample | NO. 11 Sample | |||
| Longitudinal | Transverse | Transverse | |||
| STBA12 | ≥ 382 | ≥ 206 | ≥ 30 | ≥ 25 | ≥ 22 |
| STBA13 | ≥ 412 | ≥ 206 | ≥ 30 | ≥ 25 | ≥ 22 |
| STBA20 | ≥ 412 | ≥ 206 | ≥ 30 | ≥ 25 | ≥ 22 |
| STBA22 | ≥ 412 | ≥ 206 | ≥ 30 | ≥ 25 | ≥ 22 |
| STBA23 | ≥ 412 | ≥ 206 | ≥ 30 | ≥ 25 | ≥ 22 |
| STBA24 | ≥ 412 | ≥ 206 | ≥ 30 | ≥ 25 | ≥ 22 |
| STBA25 | ≥ 412 | ≥ 206 | ≥ 30 | ≥ 25 | ≥ 22 |
| STBA26 | ≥ 412 | ≥ 206 | ≥ 30 | ≥ 25 | ≥ 22 |
Note:
1. 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.
2. 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).
3. 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.
The dimensional tolerances of tube shall be as follows:
(1)The tolerance on the outside diameter of the tube
Note:For the tolerances on the outside diameter of electric resistance welded steel tube other than cold finished, if specially required by the purchaser, the tolerances on the outside diameter of cold finished steel tube may substitute.
(2)Tolerances on Wall Thickness and on Thickness Deviation
Note:The "thickness deviation" means the ratio of the difference between the maximum and the minimum thickness of the wall measured in the same section to the ordered wall thickness and shall not be applied to the tube under 5.6 mm in wall thickness
(3)The Tolerance on length of the tube
Note:When accurate length is particularly required, the tolerances on it shall be agreed upon by the purchaser and the manufacturer.
W=0.2466 t (D-t)
where
W: unit mass of tube(kg/m)
t: wall thickness of tube(mm)
D: outside diameter of tube(mm)
The dimensional tolerances of tube shall be as follows:
(1)The tolerance on the outside diameter of the tube
Tolerances on Outside Diameter Unit: mm
| 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 | |
Note:For the tolerances on the outside diameter of electric resistance welded steel tube other than cold finished, if specially required by the purchaser, the tolerances on the outside diameter of cold finished steel tube may substitute.
(2)Tolerances on Wall Thickness and on Thickness Deviation
| 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 | --- | --- | ||||
Note:The "thickness deviation" means the ratio of the difference between the maximum and the minimum thickness of the wall measured in the same section to the ordered wall thickness and shall not be applied to the tube under 5.6 mm in wall thickness
(3)The Tolerance on length of the tube
| 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.
|
||
Note:When accurate length is particularly required, the tolerances on it shall be agreed upon by the purchaser and the manufacturer.
Testing items:
Chemical Analysis, Tensile Test , Flattening test, Flaring test, Reverse Flattening Test , Hydrostatic Test or Nondestructive Examination.
Marking
The tubes which have passed the inspection shall be marked with the following items on each tube. However, the order of arranging the items is not specified.
Further, in the case of either smaller tubes or a request from the purchaser, the tubes may be bundled together and marked by a suitable method on each bundle.
Moreover, when approved by the purchaser, part of items may be omitted.
(1) Symbol of class
(2) Symbol representing the method of manufacture (³)
(3) Dimensions
(4) Manufacturer's name or its abbreviation
(5) Symbol representing the designation of special quality requirements: Z
Note ( 2 )
Note ( 2 )
Symbols representing the methods of manufacture shall be as follows:
However, the sign - 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