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JIS G3458-alloy steel boiler pipes

Publisher:TianchengTime:2018-07-08Number:79

JIS G3458-alloy steel boiler pipes

JIS G3458 Standard is made for heat resistant alloy steel pipes that are used for high temperature conveying fluid pipes for heaters and boiler tubes.

Manufacture Method:

GradeHeat treatment
STPA 12Low temperature annealing isothermal annealing, full annealing, normalizing full annealing, normalizing or normalizing followed by tempering
STPA 20
STPA 22
Low temperature nnealing, isothermal annealing, full annealing or followed tempering
STPA 23
STPA 24
Isothermal annealing, full annealing or normalizing followed by tempering
STPA 25
STPA 26

Chemical Composition:

GradeChemical Composition %
CSiMnPSCrMo
STPA 120.10~0.200.10~0.500.30~0.800.035 max.0.035 max.-0.45~0.65
STPA 200.10~0.200.10~0.500.30~0.600.035 max.0.035 max.0.50~0.800.45~0.65
STPA 220.15max.0.50 max.0.30~0.600.035 max.0.035 max.0.80~1.250.45~0.65
STPA 230.15max.0.50~1.000.30~0.600.030 max.0.030 max.1.00~1.500.45~0.65
STPA 240.15max.0.50 max.0.30~0.600.030 max.0.030 max.1.90~2.600.87~1.13
STPA 250.15max.0.50 max.0.30~0.600.030 max.0.030 max.4.00~6.000.45~0.65
STPA 260.15max.0.25~1.000.30~0.600.030 max.0.030 max.8.00~10.000.90~1.10

Mechanical Properties:

GradeMechanical Properties
Tensile strengthYield point or proof stressElongation %
kgf/mm2 {N/mm2}kgf/mm2 {N/mm2}No. 11 or No.12 test pieceNo. 5 test pieceNo.4 test piece
LongitudinalTransverseLongitudinalTransverse
STPA 1239{382}min.21{206} min.30 min.25 min.24 min.19 min.
STPA 2042{412}min.21{206} min.30 min.25 min.24 min.19 min.
STPA 2242{412}min.21{206} min.30 min.25 min.24 min.19 min.
STPA 2342{412}min.21{206} min.30 min.25 min.24 min.19 min.
STPA 2442{412}min.21{206} min.30 min.25 min.24 min.19 min.
STPA 2542{412}min.21{206} min.30 min.25 min.24 min.19 min.
STPA 2642{412}min.21{206} min.30 min.25 min.24 min.19 min.

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