Products Description
Product Specifications
| Standards | ASTM A789 / ASME SA789 |
| Steel Grades | S31200 S31260 S31500 S31803 S32001 S32101 S32202 S32205 S32304 S32506 S32520 S32550 S32707 S32750 S32760 S32808 S32900 S32906 S32950 S33207 S39274 S39277 S82011 S82031 S82441 S83071 |
| Equivalent Standards |
EN 10216-5,DIN 17458,GOST 9941-81/9940-81 |
| Outer Diameter (OD) | 6 mm – 1219 mm |
| Wall Thickness (WT) | 0.5 mm – 60 mm |
| Length | 6/12m, or customizable |
| Surface Treatment | Pickled & Passivated |
| Production Process | Hot Extruded, Cold Drawn, Cold Rolled,ERW, TIG Welded |
| Condition | Solution Annealed |
The yield strength of UNS S31803 is more than double that of 316L stainless steel, enabling a reduction in the weight of chemical processing equipment without compromising structural integrity.
ASTM A789 UNS S31803 Super Duplex Stainless Steel pipe undergoes solution annealing. When welding, matching 2209 filler material can be selected; this ensures that the corrosion resistance of the weld seam remains consistent with that of the base metal, thereby eliminating the need for additional post-weld heat treatment and enhancing operational efficiency.
These pipes are capable of stable, long-term operation within a temperature range of -50°C to 300°C, making them ideally suited to meet the piping requirements of high-temperature equipment-such as reactors and heat exchangers-used in chemical processing applications.
Customized Services
- TORICH offers custom sizing services, covering seamless tubes with outer diameters ranging from 10 mm to 219 mm, and welded tubes from 114 mm to 1219 mm, as well as precision cut-to-length services.
- We provide various tube end finishes-including plain ends, beveled ends (at multiple angles), threaded ends, and grooved ends-to meet the specific process requirements for butt welding or threaded connections.
- For equipment such as heat exchangers, we offer specialized U-bending services and supply extra-long coiled tubing.
Chemical Composition
| Element | C | Si | Mn | P | S | Cr | Ni | Mo | N | Fe |
|---|---|---|---|---|---|---|---|---|---|---|
| UNSS31803 | ≤0.03 | ≤1.00 | ≤2.00 | ≤0.03 | ≤0.02 | 21.0–23.0 | 4.5–6.5 | 2.5–3.5 | 0.08–0.20 | Balance |
Mechanical Properties
| Property | Tensile Strength | Yield Strength (0.2% Offset) | Elongation | Hardness | Impact Toughness | Ferrite Content |
|---|---|---|---|---|---|---|
| UNS S31803 | ≥620 MPa | ≥450 MPa | ≥25% | ≤290 HB | Excellent | 35–60% |
Possible Alternative Grades
- The PREN value of UNS S32750 exceeds 40, making it suitable for use in extremely harsh chemical environments-such as high-temperature seawater, acidic chloride-containing media, and flue gas desulfurization systems.
- 316L austenitic stainless steel is resistant to weakly acidic and low-chloride media, making it suitable for general chemical processing applications involving mild corrosive media and lower pressures.
- UNS S32304 is an economical, molybdenum-free duplex stainless steel alloy, suitable for applications where specific strength requirements exist but the corrosive environment is relatively mild.
applications areas
The primary applications of UNS S31803 welded Super Duplex Stainless Steel Pipe in chemical processing include:
- General process transfer piping, such as acid transport lines and alkaline circulation lines
- Heat exchanger shells and low-pressure piping
- Piping connecting storage tanks and vessels
- Scrubbers and effluent treatment systems
The primary applications of UNS S31803 seamless Super Duplex Stainless Steel Pipe in chemical processing include:
- High-pressure process piping, such as reactor feed lines and catalyst transport lines
- Heat exchanger and pressure vessel tubing
- Corrosive acid transport systems
- High-purity chemical transport
- Small-bore instrumentation and sampling tubing
Products Show
Testing Equipment
Factory Equipment
Pickling equipment
Products Package
FAQ
Q: Is ASTM A789 UNS S31803 Super Duplex Stainless Steel Pipe suitable for use in high-temperature conditions?
A: The recommended service temperature range for UNS S31803 is -50°F to +600°F (approximately -46°C to +315°C).
Q: Does S31803 piping require post-weld pickling and passivation treatment?
A: Yes. The welding process disrupts the pipe's original passive film and generates oxide discoloration; pickling removes this oxide layer, while passivation restores a dense, intact, and protective passive film.
Q: What are the advantages of this material compared to 316L stainless steel?
A: It offers superior corrosion resistance; it possesses higher strength-with a yield strength 2.6 times that of 316L-which allows for the use of thinner wall thicknesses, thereby reducing costs; and it exhibits more stable performance at elevated temperatures, capable of operating reliably at temperatures up to 300°C.
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