TP321 / 321H Stainless Steel U Bend Pipe , 321 Stainless Steel Tubing Heat Exchanger SA213
TP321 / 321H Stainless Steel U Bend Pipe , 321 Stainless Steel Tubing Heat Exchanger SA213
Grade 321 is a common austenitic 18/8 stainless steel alloy, with the addition of titanium, making it a good choice in high temperature environments of up to 900° C. 321 stainless steel has good welding and forming capabilities and is widely used in operating temperature environments in excess of 500° C.
Stainless steel 321H, commonly referred as UNS S32109, is the higher carbon version of the 321 grade, to provide higher temperature strength.321/321H Pipes,Tubes and 321H pipe fittings are mainly used in manufacturing heat exchangers, pressure vessels, pharmaceutical and chemical processing equipments.
Standard Technical Range
- OD 9.5mm - 38.1mm
- WT up to 6.35mm
- Bending radii 1.25 x OD up to 1700mm
- Bends can be supplied in accordance with TEMA R / ASTM SA/A556
- Leg length up to 15000mm
- Heat treatment where required by electric furnance or direct resistance
- Hydrotesting up to 10,000 psi
Additional Testing
- Dye penetrant of 'U' bend area
- PMI testing
- Heat Treatment
Heat Treatment
We are equipped to carry out heat treatment of bends plus a minimum 150mm of leg.
Heat Treatment Equipment
- Heat treatment equipment is computer controlled with the added facility of data recording.
- An argon protective atmopshere is used inside stainless and special alloy tubes during heat treatment.
- We can provide all types of annealing; solution annealing and stress relieving.
321/321H Stainless Steel Pipes, Tube Chemical Composition
| Grade | C | Mn | Si | P | S | Cr | Ni | Ti | N |
| 321 | 0.08 max. | 2.00 max. | 0.75 max. | 0.045 max. | 0.03 max. | 17.0 – 19.0 | 9.0-12.0 | 5 x (C+N) min. | 0.1 |
| (0.70max.) | |||||||||
| 321H | 0.04 – 0.10 | 2.00 max. | 0.75 max. | 0.045 max. | 0.03 max. | 17.0 – 19.0 | 9.0-12.0 | 5 x (C+N) min. | 0.1 |
| (0.70max.) |
321/321H Stainless Steel Pipes, Tube Mechanical Properties
| 321 | |
| Density | 7.92 |
| Melting Range,℃ | 1398-1446 |
| Elongation % | 40 |
| Tensile Strength (Mpa) | 515 |
| Yield Strength (Mpa) | 205 |
| Hardness (Brinell) | 217 |
Stainless Steel Tube Standards:
American standards:
ASTM A249: Standard specification for welded austenitic steel boiler,superheater, heat-exchanger and condenser tubes.
ASTM A269:Standard specification for welded austenitic stainless steel tubing for general service.
ASTM A688:Standard specification for welded austenitic stainless steel feedwater heater tubes.
ASTM A554:Standard specification for welded stainless steel mechanical tubing.
ASTM A268:Specification for seamless and welded Ferritic/Martensitic stainless steel tubing for General Service
ASTM A789:Specification for seamless and welded Ferritic/Austenitic stainless steel tubing for General Service
ASTM A312:Seamless/Welded austenitic stainless steel pipe
Germanic standards:
DIN17455:General purpose welded circular stainless steel tubes
DIN17457: Welded circular austenitic stainless steel tubes subject to special requirements; technical delivery conditions
European Standard:
EN 10217-7:Welded Steel Tubes for pressure purposes-Part 7 Stainless steel tubes
| Materials - U-Bent Tube | |
|---|---|
| Carbon Steel | SA 179 / A 179 |
| Carbon Steel | SA 210 / A 210 |
| Carbon Steel | SA 334 / A 334 |
| Stainless Steel | SA 213 / A 213 |
| SA249 / A249 | |
| SA268 / A268 | |
| SA688 / A688 | |
| Duplex Stainless Steel | SA 789 / A 789 |
| Copper & Cu Alloys | SB 111 / B 111 |
| Titanium & Ti Alloys | SB 338 / B 338 |
| For different materials please contact our sales department. | |
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