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Introduction to JIS G3458 alloy steel boiler tube standard specifications-CONTINENTAL STEEL CO.,LTD
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Introduction to JIS G3458 alloy steel boiler tube standard specifications

Mar 05, 2024

Introduction to JIS G3458 alloy steel boiler tube standard specifications

The JIS G3458 standard is formulated for heat-resistant alloy steel pipes used as high-temperature fluid conveying pipes for heaters and boiler tubes.

Production Method:

Grade Heat treatment
STPA 12 Low 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:

Grade Chemical Composition %
C Si Mn P S Cr Mo
STPA 12 0.10~0.20 0.10~0.50 0.30~0.80 0.035 max. 0.035 max. - 0.45~0.65
STPA 20 0.10~0.20 0.10~0.50 0.30~0.60 0.035 max. 0.035 max. 0.50~0.80 0.45~0.65
STPA 22 0.15max. 0.50 max. 0.30~0.60 0.035 max. 0.035 max. 0.80~1.25 0.45~0.65
STPA 23 0.15max. 0.50~1.00 0.30~0.60 0.030 max. 0.030 max. 1.00~1.50 0.45~0.65
STPA 24 0.15max. 0.50 max. 0.30~0.60 0.030 max. 0.030 max. 1.90~2.60 0.87~1.13
STPA 25 0.15max. 0.50 max. 0.30~0.60 0.030 max. 0.030 max. 4.00~6.00 0.45~0.65
STPA 26 0.15max. 0.25~1.00 0.30~0.60 0.030 max. 0.030 max. 8.00~10.00 0.90~1.10

Mechanical Properties:

Grade Mechanical Properties
Tensile strength Yield point or proof stress Elongation %
kgf/mm2 {N/mm2} kgf/mm2 {N/mm2} No. 11 or No.12 test piece No. 5 test piece No.4 test piece
Longitudinal Transverse Longitudinal Transverse
STPA 12 39{382}min. 21{206} min. 30 min. 25 min. 24 min. 19 min.
STPA 20 42{412}min. 21{206} min. 30 min. 25 min. 24 min. 19 min.
STPA 22 42{412}min. 21{206} min. 30 min. 25 min. 24 min. 19 min.
STPA 23 42{412}min. 21{206} min. 30 min. 25 min. 24 min. 19 min.
STPA 24 42{412}min. 21{206} min. 30 min. 25 min. 24 min. 19 min.
STPA 25 42{412}min. 21{206} min. 30 min. 25 min. 24 min. 19 min.
STPA 26 42{412}min. 21{206} min. 30 min. 25 min. 24 min. 19 min.
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