A789 UNS S32205 S331803 S332750 Super Duplex Steel Pipe Heater Air Cooler Condenser Tank
Sep 23, 2025
Hagyjon üzenetet
ASTM A789 Specification
ASTM A789/A789M specification covers standard requirements for grades of nominal wall thickness, and stainless steel tubing for services requiring general corrosion resistance, with particular emphasis on resistance to stress corrosion cracking. These steels are susceptible to embrittlement if used for prolonged periods at elevated temperatures.
We offer ASTM A789 UNS S31803 S32750 S32760 Duplex Stainless Steel Tubing in a wide range of dimensions, both welded and seamless stainless steel tubing, duplex steel maintains high strength and excellent corrosion resistance so it can be applied in harsh environments. UNS S32750 and S32760 are super duplex steel grades, which possess excellent mechanical properties, often a light gauge of duplex material can be used to achieve the same design strength of a thicker nickel alloy. ASTM A790 is pipe standard for duplex steel material.
A789 UNS S32205 S331803 S332750 Super Duplex Steel Pipe Heater Air Cooler Condenser Tank Advantages
The A789 UNS S32205/S31803/S32750 super duplex stainless steel pipes are designed for demanding applications such as heaters, air coolers, condensers, and tanks, and comply with the ASTM A789 standard.
With a PREN value >=40 (S32750 can reach 42), significantly higher than that of common stainless steels like 316L (PREN≈26), these pipes exhibit outstanding resistance to pitting, crevice corrosion, and stress corrosion cracking in chlorides-containing, high-temperature, and highly corrosive environments (such as seawater and chemical fluids). Their service life is 2-3 times longer than that of 316L.
Featuring a yield strength >=450 MPa (more than twice that of 316L) and a tensile strength >=620 MPa, they allow for a 30%-50% reduction in wall thickness, significantly reducing material weight and system load. This makes them particularly suitable for load-sensitive equipment such as heaters and air coolers.
They stably operate across a wide temperature range of -50℃ to 300℃, balancing low-temperature toughness and high-temperature structural integrity to meet the requirements of various temperature scenarios such as condensers and tanks.
ASTM A789 Duplex Stainless Steel Tubing Specifications
| ASTM A789, ASME SA789 | |
| UNS S31803, S32750, S32760 | |
| 6 – 610 mm | |
| 0.5 – 30 mm, Average Wall Or Minimum Wall | |
| Specific or Rando, standard 6000 mm length | |
ASTM A789 Stainless Steel Tubing Tolerances
Diameter, In. |
In. [Mm] |
%, |
Cut Length, In. |
Cut Length, In. |
|||
|---|---|---|---|---|---|---|---|
| Up To 1⁄2 [12.7], Excl | ±0.005 [0.13] | ±15 | 30 | 0 | 1⁄8 [3] | 0 | … |
| 1⁄2 To 11⁄2 [12.7 To 38.1], Excl | ±0.005 [0.13] | ±10 | 20 | 0 | 1⁄8 [3] | 0 | Less Than 0.065 In. [1.6 Mm] Specified |
| 11⁄2 To 31⁄2 [38.1 To 88.9], Excl | ±0.010 [0.25] | ±10 | 20 | 0 | 3⁄16 [5] | 0 | Less Than 0.095 In. [2.4 Mm] Specified |
| 31⁄2 To 51⁄2 [88.9 To 139.7], Excl | ±0.015 [0.38] | ±10 | 20 | 0 | 3⁄16 [5] | 0 | Less Than 0.150 In. [3.8 Mm] Specified |
| 51⁄2 To 8 [139.7 To 203.2], Incl | ±0.030 [0.76] | ±10 | 20 | 0 | 3⁄16 [5] | 0 | Less Than 0.150 In. [3.8 Mm] Specified |
All ASTM A789 stainless steel pipe supplied by GNEE is delivered in the heat-treated condition, according to the specified temperature and quenching conditions. When the final heat treatment is performed in a continuous furnace, or when the heat-treated condition is achieved by direct quenching after hot forming, the number of pipes of the same size and heat in a batch is determined based on the specified pipe size.
Before shipment, mechanical tests such as tensile testing, flaring testing (seamless pipe), flange testing (welded pipe), hardness testing, and reverse flattening testing are performed. Each pipe is also subjected to a non-destructive electric spark test or hydrostatic test.
ASTM A789 UNS S31803 Duplex steel tube, ASTM A789 Duplex steel UNS S32205 tube, ASTM A789 Duplex steel 2205 tube, ASTM A789 Duplex steel UNS S32750 tube, ASME SA789 Duplex steel S32520 tube, Duplex stainless-steel tube S31803, Duplex stainless steel tube S32205, ASME SA789 UNS S32760 Duplex stainless steel tubing, super duplex stainless steel tube 2507.
A szálláslekérdezés elküldése