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Description

Korea KS STHA 20 Boiler steel grade and alloy steel tubes for heat exchanger and STHA 20 Mechanical Properties, Chemical Element, Cross Reference, Datasheet.

Datasheet for: Steel Grades:Structure Steel: STHA 20
Category Type Steel Grade Standard Country Application
Steel GradesStructure Steel STHA 20 KS Korea Boiler steel grade and alloy steel tubes for heat exchanger
SEV 245/SEV 25
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

Chemical composition(mass fraction)(wt.%) of the STHA 20

C(%) Si(%) Mn(%) P(%) S(%) Cr(%) Mo(%)
0.10-0.20 0.10-0.50 0.30-0.60 0.035 0.035 0.50-0.80 0.45-0.65

Mechanical Properties of steel grade STHA 20

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)
189 (≥) 344 (≥) 33 13 12 Solution and Aging, Annealing, Ausaging, Q+T,etc 313

Physical Properties of steel grade STHA 20

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
11 - -     0.21 -  
553 883 - 34.3 413   -  
372 - 31 22.2   113 141

Heat Treatment of steel grade STHA 20

Heat treated : 1225°C - 1446°C

Technological Curves of steel grade STHA 20

Cross Reference Table (Equivalent Grade) of STHA 20

Grade Standard Country Application
STHA 20 KS Korea Boiler steel grade and alloy steel tubes for heat exchanger

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