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KS STS321HTF Details
Steel tubes for fired heater
KS STS321HTF Standard Download
STS321HTF Datasheet
KS STS321HTF| Category | Type | Grade | Microstructure | Designations |
|---|---|---|---|---|
| Grades | Stainless Steels | STS321HTF | Austenite | Korea - KS , D 3587 (1991) - Steel tubes for fired heater |
| 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％ | - |
| 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) |
|---|---|---|---|---|---|---|
| 814 (≥) | 696 (≥) | 24 | 43 | 24 | Solution and Aging, Annealing, Ausaging, Q+T,etc | 112 |
| 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 |
|---|---|---|---|---|---|---|---|
| 554 (≥) | 528 (≥) | 42 | 14 | 14 | Solution and Aging, Annealing, Ausaging, Q+T,etc | 444 | |
| Temp. °C/°F |
Creep strain limit (10000h) (Rp1,0) N/mm2 |
Creep rupture strength (10000h) (Rp1,0) N/mm2 |
|||||
| 753 | 241 | 588 |
| 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 |
| 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 |