JIS G3462 STBA20 Alloy Steel Seamless Boiler Tubes
Standard: JIS G3462
JIS G3462 STBA20 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 STBA20 Alloy steel boiler and heat exchanger tubes Quick Details
Type:Seamless or electric resistance welding.
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
Method of Manufacture
The tubes of STBA 20 shall be manufactured by seamless process or by electric resistance welding process
The tube shall be subjected to heat treatments
||Low temperature annealing, isothermal annealing, full annealing, normalizing or normalizing followed by tempering
Low temperature annealing shall not be applied to the electric resistance welded steel tube.
Chemical Composition of JIS G3462 STBA20
||Chemical Composition Limits (%)
Mechanical Properties of JIS G3462 STBA20
||Tensile Property (N/mm2)
||Yield Point or Yield Strength (N/mm2)
|OD ≥ 20 mm
||10 mm ≤ OD ＜20 mm
||OD ＜10 mm
|NO. 11 Sample; NO. 12 Sample
||NO. 11 Sample
||NO. 11 Sample
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.
Chemical Analysis, Tensile Test , Flattening test, Flaring test, Reverse Flattening Test , Hydrostatic Test or Nondestructive Examination.