JIS G3462 STBA25 Alloy Steel Seamless Boiler Tubes
- JIS G3462
- China
- Stock
- STBA25
JIS G3462 STBA25 alloy steel tube is not applicable for heating furnaces and heat exchangers for low temperature service.
JIS G3462 STBA25 Alloy Steel Seamless Boiler Tubes
JIS G3462 STBA25 Alloy Steel Seamless Boiler Tubes
JIS G3462 STBA25 Alloy steel boiler and heat exchanger tubes
Standard: JIS G3462
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 STBA25 alloy steel tube is not applicable for heating furnaces and heat exchangers for low temperature service.
JIS G3462 STBA25 Alloy steel boiler and heat exchanger tubes Quick Details
Type:Seamless Steel Pipe
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
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
Method of Manufacture
The tubes of STBA25 shall be manufactured by seamless process.
Heat treatments
| Grade | Heat treatment |
| STBA 25 | Isothermal annealing, full annealing or normalizing followed by tempering |
Remark
1. Low temperature annealing shall not be applied to the electric resistance welded steel tube.
2. The tempering temperature for STHA25 shall be 650˚ or higher
Chemical Composition
| Standard | Grade | Chemical Composition Limits (%) | ||||||
| C | Si | Mn | P | S | Cr | Mo | ||
| JIS G3462 | STBA25 | ≤ 0.15 | ≤ 0.50 | 0.30-0.60 | ≤ 0.030 | ≤ 0.030 | 4.00-6.00 | 0.45-0.65 |
Mechanical Properties
| 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 | |||
| STBA25 | ≥ 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.
Testing items:
Chemical Analysis, Tensile Test , Flattening test, Flaring test, Reverse Flattening Test , Hydrostatic Test or Nondestructive Examination.
Types of Packaging:
- Bundles (hexagonal)
- Wooden Boxes
- Crates (steel/wooden)
- Special crates for U-Bend tubes with each radius separated
- Alloy Seamless Steel Pipe packing can meet any needs of the customers.
Delivery: 7-15 days after payment
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 )
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
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