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Description

Korea KS STHA 22 Boiler steel grade and alloy steel tubes for heat exchanger and STHA 22 Mechanical Properties, Chemical Element, Cross Reference, Datasheet.

Datasheet for: Steel Grades:Structure Steel: STHA 22
Category Type Steel Grade Standard Country Application
Steel GradesStructure Steel STHA 22 KS Korea Boiler steel grade and alloy steel tubes for heat exchanger
SEV 295/SEV 30
SEV 345/SEV 35
SBB 410/SBB 42
SBB 450/SBB 46
SBB 450M/SBB 46M
SBB 480/SBB 49
SBB 480M/SBB 49M
STHA 12
STHA 13
STHA 20

Chemical composition(mass fraction)(wt.%) of the STHA 22

C(%) Si(%) Mn(%) P(%) S(%) Cr(%) Mo(%)
0.15 0.50 0.30-0.60 0.035 0.035 0.80-1.25 0.45-0.65

Mechanical Properties of steel grade STHA 22

Yield
Rp0.2 (MPa)
Tensile
Rm (MPa)
Impact
KV/Ku (J)
Elongation
A (%)
Reduction in cross section on fracture
Z (%)
As-Heat-Treated Condition Brinell hardness (HBW)
381 (≥) 318 (≥) 14 11 32 Solution and Aging, Annealing, Ausaging, Q+T,etc 214

Physical Properties of steel grade STHA 22

Temperature
(°C)
Modulus of elasticity
(GPa)
Mean coefficient of thermal expansion 10-6/(°C) between 20(°C) and Thermal conductivity
(W/m·°C)
Specific thermal capacity
(J/kg·°C)
Specific electrical resistivity
(Ω mm²/m)
Density
(kg/dm³)
Poisson’s coefficient, ν
22 - -     0.24 -  
563 281 - 14.3 314   -  
511 - 44 24.2   334 333

Heat Treatment of steel grade STHA 22

Heat treated : 1949°C - 1217°C

Technological Curves of steel grade STHA 22

Cross Reference Table (Equivalent Grade) of STHA 22

Grade Standard Country Application
STHA 22 KS Korea Boiler steel grade and alloy steel tubes for heat exchanger

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