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Duplex tube
What is Duplex stainless steel tube?
Duplex is a two phase alloy with 50-50 of both austenite and ferrite in its microstructure. The Duplex Stainless Steel is more affordable than other steel alloys and can also minimize weakness. They show good ductility than the martensitic and ferritic grades to at least -50 °C. The duplex material has high chromium and molybdenum content. But the Duplex Tubes have a lower nickel content compared to the austenitic grades of stainless steel. Due to this composition, they show good resistance to corrosion.
As the Duplex Steel Tubes has properties of both ferrite and austentic, they are the most sought after in heavy industries, like nuclear, oil and gas, chemical processing, etc. They have high strength, good toughness and ductility.
2205 Duplex heat exchanger tubes manufacturer in India
Advantages to use Duplex steel tube in heat exchangers & boilers
Due to the high chromium content in the Duplex Heat Exchanger Tubes, the alloy forms a protective layer on the surface of the tube. This enhances the corrosion resistance properties of the tubes by oxidation. Duplex Seamless Tubes comes with higher yield strength, which is almost twice of the conventional austenitic stainless steel.
The wall thickness and cross section of the tubes can be reduced without affecting its mechanical properties. They will continue to deliver the same performance. These are the reasons why Duplex Stainless Steel Tube manufacturers in India recommend using high quality duplex tubes for heat exchangers.
Duplex stainless steel tube supplier in Gujarat, Refer Alloy 2205 seamless tube dimensions and price
Duplex stainless steel tube
Duplex tube
Duplex 2205 tube
What is fractional 2205 tubing?
The 2205 tubing material is high strength and corrosion resistant alloy. The term "fractional" usually refers to the outside diameter (OD) size of the tubing, which is typically expressed in fractional inches. Fractional Duplex 2205 Tubes is commonly used in various commercial and industrial applications like chemical processing, oil and gas production and marine environments. They are available in both welded and seamless forms and can be custom-made to different sizes and specifications.
Having trouble locating Duplex heat exchanger tube in unusual sizes? check out our stock of 2205 tubing in range from 4mm to 219mm length or custom
Table of Contents
- Specifications of Duplex stainless steel tube
- Duplex tube types
- Mechanical properties of Duplex 2205 tubes
- Chemical composition of 2205 tubing
- 2205 duplex stainless steel tubing physical properties
- 2205 stainless steel tubing roughness
- Duplex heat exchanger tubes equivalent
- Size chart of Duplex steel tubes
- Duplex seamless tube pressure rating
- Duplex boiler tubes tolerance
- Duplex tube grade
Specifications of Duplex stainless steel tube
| Outside Diameter (OD) | Wall Thickness | Size |
|---|---|---|
| .250"–1.000" | .035″–.134″ | 1/2” to 8” |
| Standards | Forms | Types |
| ASTM A 790 ASME B36.10M, ASME SA 790, B36.19M | Round, Hydraulic, Coiled, Hollow | Seamless, Welded |
Get the best offer by contacting Tubotech for Duplex steel tube, Check the 2205 duplex stainless steel tubing weight chart
Duplex tube types
2205 tubing
2205 duplex stainless steel tubing
2205 stainless steel tubing
Duplex steel tube
Duplex heat exchanger tube
Duplex seamless tube
Duplex 2205 tube manufacturer in India, Buy Duplex seamless tube and 2205 stainless steel tubing at factory price with MTC EN 10204 3.1 and 3.2
Mechanical properties of Duplex 2205 tubes
| Mechanical properties | Yield,min,ksi[MPa] | Tensile,min,ksi[MPa] | Hardness,HB(max) | Elongation,%(min) |
| S31803 | 65 [450] | 90 [620] | 290 | 25 |
| S32205 | 65 [450] | 95 [655] | 290 | 25 |
Chemical composition of 2205 tubing
| Grade | C≤ | P≤ | Cr | S≤ | Mn≤ | Si≤ | Ni | N | Mo | Cu |
| S31803 | 0.03 | 0.03 | 21.0–23.0 | 0.02 | 2.00 | 1.00 | 4.5–6.5 | 0.08–0.20 | 2.5–3.5 | - |
| S32205 | 0.03 | 0.03 | 22.0–23.0 | 0.02 | 2.00 | 1.00 | 4.5–6.5 | 0.14–0.20 | 3.0–3.5 | - |
2205 duplex stainless steel tubing physical properties
| Thermal Conductivity @ 20C | W/m/°K | 15 |
| Specific Heat (0-100°C) | J/kg/°K | 500 |
| Thermal Expansion | μm/m/°C | 13 |
| Electrical Resistivity | Ohm-cm | 8.5 |
| Modulus Elasticity | GPa | 200 |
| Density | g/cm3 | 7.8 |
2205 stainless steel tubing roughness
| Outside surface roughnes | Inside surface roughness |
| RA 20 defect level max. 50 μm | RA 20 defect level max. 20 μm |
Duplex heat exchanger tubes equivalent
| Grade | Old British | UNS No | Euronorm | Japanese JIS | Swedish SS | ||
| BS | En | No | Name | ||||
| 2205 | 318S13 | – | S31803 / S32205 | 1.4462 | X2CrNiMoN22-5-3 | SUS 329J3L | 2377 |
Size chart of Duplex steel tubes
| WT mm | inch | Sch | Kg/m | OD mm |
|---|---|---|---|---|
| 1.065 | 1/4 | 10S | 0.050 | 13.072 |
| 2.024 | 1/4 | 40S | 0.064 | 13.072 |
| 3.002 | 1/4 | 80S | 0.081 | 13.072 |
| 1.065 | 3/8 | 10S | 0.064 | 17.015 |
| 2.031 | 3/8 | 40S | 0.086 | 17.015 |
| 3.020 | 3/8 | 80S | 1.012 | 17.015 |
| 2.011 | 1/2 | 10S | 1.002 | 21.034 |
| 2.077 | 1/2 | 40S | 1.029 | 21.034 |
| 3.073 | 1/2 | 80S | 1.065 | 21.034 |
| 2.011 | 3/4 | 10S | 1.030 | 26.067 |
| 2.087 | 3/4 | 40S | 1.071 | 26.067 |
| 3.091 | 3/4 | 80S | 2.023 | 26.067 |
| 2.077 | 1 | 10S | 2.013 | 33.040 |
| 3.038 | 1 | 40S | 2.054 | 33.040 |
| 4.055 | 1 | 80S | 3.029 | 33.040 |
| 6.0352) | 1 | 160 | 4.030 | 33.040 |
| 2.077 | 1¼ | 10S | 2.073 | 42.016 |
| 3.056 | 1¼ | 40S | 3.044 | 42.016 |
| 4.085 | 1¼ | 80S | 4.053 | 42.016 |
| 6.0352) | 1¼ | 160 | 5.069 | 42.016 |
| 2.077 | 1½ | 10S | 3.016 | 48.026 |
| 3.068 | 1½ | 40S | 4.011 | 48.026 |
| 5.008 | 1½ | 80S | 5.049 | 48.026 |
| 2.077 | 2 | 10S | 3.099 | 60.033 |
| 3.091 | 2 | 40S | 5.052 | 60.033 |
| 5.054 | 2 | 80S | 7.060 | 60.033 |
| 8.0742) | 2 | 160 | 11.029 | 60.033 |
| 3.005 | 2½ | 10S | 5.035 | 73.003 |
| 5.016 | 2½ | 40S | 8.077 | 73.003 |
| 7.001 | 2½ | 80S | 11.059 | 73.003 |
| 3.005 | 3 | 10S | 6.056 | 88.090 |
| 5.049 | 3 | 40S | 11.047 | 88.090 |
| 7.062 | 3 | 80S | 15.051 | 88.090 |
| 11.0132) | 3 | 160 | 21.067 | 88.090 |
| 3.005 | 3½ | 10S | 7.053 | 101.060 |
| 5.074 | 3½ | 40S | 13.078 | 101.060 |
| 8.008 | 3½ | 80S | 18.092 | 101.060 |
| 3.005 | 4 | 10S | 8.050 | 114.030 |
| 6.002 | 4 | 40S | 16.032 | 114.030 |
| 8.056 | 4 | 80S | 22.067 | 114.030 |
| 13.0492) | 4 | 160 | 34.005 | 114.030 |
| 6.055 | 5 | 40S | 22.010 | 141.030 |
| 9.053 | 5 | 80S | 31.044 | 141.030 |
| 15.0882) | 5 | 160 | 49.087 | 141.030 |
| 3.04 | 6 | 10S | 14.004 | 168.028 |
| 7.011 | 6 | 40S | 28.069 | 168.028 |
| 10.097 | 6 | 80S | 43.021 | 168.028 |
| 14.027 | 6 | 120 | 54.075 | 168.028 |
| 18.0262) | 6 | 160 | 68.059 | 168.028 |
| 8.018 | 8 | 40S | 43.020 | 219.008 |
| 12.07 | 8 | 80S | 65.063 | 219.008 |
| 18.023 | 8 | 120 | 91.030 | 219.008 |
| 23.0012) | 8 | 160 | 112.097 | 219.008 |
Duplex seamless tube pressure rating
| Tubes O.D. (in.) | Wall Thickness of Tubes (inches) | |||||||
|---|---|---|---|---|---|---|---|---|
| .028 | .035 | .049 | .065 | .083 | .095 | .109 | .120 | |
| Working Pressure (psig) | ||||||||
| 3/8 | 3100 | 4400 | 6100 | |||||
| 1/2 | 2300 | 3200 | 4400 | |||||
| 1/8 | 7900 | 10100 | ||||||
| 1/4 | 3700 | 4800 | 7000 | 9500 | ||||
| 5/16 | 3700 | 5400 | 7300 | |||||
| 3/4 | 2200 | 3000 | 4000 | 4600 | ||||
| 1 | 2200 | 2900 | 3400 | 3900 | 4300 | |||
Duplex boiler tubes tolerance
| NPS Designator | Permissible Variations in Outside Diameter | |
|---|---|---|
| Over In. | Under In. | |
| Over 1-1/2 to 4, incl | 1/32 (0.031) | 1/32 (0.031) |
| 1/8 to 1-1/2, incl | 1/64 (0.015) | 1/32 (0.031) |
| Over 8 to 18, incl | 3/23 (0.093) | 1/32 (0.031) |
| Over 4 to 8, incl | 1/16 (0.062) | 1/32 (0.031) |
Duplex tube grade