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KS STS321TB Details

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STS321TB Application:Stainless steel for boiler and heat exchanger tubes

Category Type Grade Microstructure Designations
Grades Stainless Steels STS321TB Austenite Korea - KS , D 3577 (2007) - Stainless steel for boiler and heat exchanger tubes

Chemical composition(wt.%) of STS321TB grade: D 3577 (2007)

Elements Min.(≥) Max.(≤) Similar Remarks
C - 0.08
Si - 1.00
Mn - 2.00
P - 0.045
S - 0.030
Cr 17.00 19.00
Ni 9.00 13.00
Mo - -
N - -
Ti 5×C% -
Stainless steel for boiler and heat exchanger tubes

Mechanical properties of grade STS321TB D 3577 (2007)

Proof strength
Rp0.2 (MPa)
Tensile strength
Rm (MPa)
Impact energy
KV (J)
Elongation at fracture
A (%)
Reduction in cross section on fracture
Z (%)
As-Heat-Treated Condition Brinell hardness (HBW)
279 (≥) 394 (≥) 33 23 31 Solution and Aging, Annealing, Ausaging, Q+T,etc 332

Physical properties of grade STS321TB D 3577 (2007)

Property Density
kg/dm3
Temperature T
°C/F
Specific heat
J / kgK
Thermal conductivity
W/mK
Electric resistance
µΩ·cm
Modulus of elasticity
kN/mm2
Expansion rate
311 (≥) 294 (≥) 33 21 23 Solution and Aging, Annealing, Ausaging, Q+T,etc 112
Temp.
°C/°F
Creep strain limit
(10000h)
(Rp1,0) N/mm2
Creep rupture strength
(10000h)
(Rp1,0) N/mm2
622 418 976

STS321TB - Form of Supply

Product type Products Dimension Processes Deliver Status
Plates / Sheets Plates / Sheets 0.08-200mm(T)*W*L Forging, hot rolling and cold rolling Annealed, Solution and Aging, Q+T, ACID-WASHED, Shot Blasting
Steel Bar Round Bar, Flat Bar, Square Bar Φ8-1200mm*L Forging, hot rolling and cold rolling, Cast Black, Rough Turning, Shot Blasting,
Coil / Strip Steel Coil /Steel Strip 0.03-16.0x1200mm Cold-Rolled & Hot-Rolled Annealed, Solution and Aging, Q+T, ACID-WASHED, Shot Blasting
Pipes / Tubes Seamless Pipes/Tubes, Welded Pipes/Tubes OD:6-219mm x WT:0.5-20.0mm Hot extrusion, Cold Drawn, Welded Annealed, Solution and Aging, Q+T, ACID-WASHED

Cross Reference Table(Equivalent Grade)

Grade Standard Country Application
STS321 KS Korea
Special alloys steel for chemical plant
STS321TKA KS Korea
Stainless steel pipes for machine and structural purposes
STS321HTB KS Korea
Stainless steel for boiler and heat exchanger tubes
STS321HTF KS Korea
Steel tubes for fired heater
STS321TB KS Korea
Stainless steel for boiler and heat exchanger tubes
STS321TF KS Korea
Steel tubes for fired heater
STS321TPY KS Korea
Large diameter welded stainless steel pipes
STS321FB KS Korea
Stainless steel blooms and billets for forgings
STS321HFB KS Korea
Stainless steel blooms and billets for forgings
STS321HTP KS Korea
Stainless lined steel pipe
STS321TP KS Korea
Stainless lined steel pipe

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