Duplex Steel Stockist & Suppliers
UNS S31803 – UNS S32205
- F55 Super Duplex Steel
- 329 Duplex Stainless Steel
- Duplex Stainless Steel
- Alloy 255
- Super Duplex Sheets
- Duplex Steel 2205
- Super Duplex Stainless Steel
- ASME SA479 S31803 Materials
- Super Duplex Ferralium 255
- Super Duplex F53 / F55 / Uns S32750 / Uns S32760
- Duplex Steel
- Uns S32550 Super Duplex Sheet
- Duplex Steel Pipes and Tubes
- A182 F60 Duplex
Duplex & Super Duplex Steel.
Duplex alloys were originally created to combat corrosion problems caused by chloride-bearing cooling waters and other aggressive chemical process fluids.Called Duplex because of its mixed microstructure with about equal proportions of ferrite and austenite, duplex stainless steels are a family of grades, which range in corrosion performance depending on their alloy content. The chemical composition based on high contents of Cr and Mo, improves intergranular and pitting corrosion resistance, respectively. Additions of nitrogen can promote structural hardening by interstitial solid solution mechanism, which raises the yield strength and ultimate strength values without impairing toughness. Moreover, the two-phase microstructure guarantees higher resistance to pitting and stress corrosion cracking in comparison with conventional stainless steels.
Available forms are Duplex & Super Duplex Steel Seamless Pipe, Duplex & Super Duplex Steel Welded Pipe,Duplex & Super Duplex Steel Seamless Tube,Duplex & Super Duplex Steel Welded Tube,Duplex & Super Duplex Steel Round Bars,Duplex & Super Duplex Steel Welded Wire,Duplex & Super Duplex Steel Sheet,Duplex & Super Duplex Steel Plate,Duplex & Super Duplex Steel Forgings,Duplex & Super Duplex Steel Pipe Fittings and ,Duplex & Super Duplex Steel Flanges
he advantage of a duplex structure is that it combines the favorable qualities of a ferritic alloy (stress corrosion cracking resistance and high strength) with those of an austenitic alloy (ease of fabrication and corrosion resistance).
Usage of 2205 Duplex stainless steel should be limited to temperatures below 600° F. Extended elevated temperature exposure can embrittle 2205 stainless.
2205 duplex stainless steel is a cost effective solution for many applications where the 300 series stainless steels are susceptible to chloride stress corrosion cracking. Stress corrosion cracking occurs when stainless steels are subjected to tensile stress, while in contact with solutions containing chlorides. Increasing temperatures also increase the susceptibility of stainless steels to stress corrosion cracking.
The combination of chromium, molybdenum and nitrogen convey the good resistance of 2205 to chloride pitting and crevice corrosion. This resistance is extremely important for services such as marine environments, brackish water, bleaching operations, closed loop water systems and some food processing applications. The high chromium, molybdenum and nitrogen contents of 2205 provide corrosion resistance superior to common stainless steels, such as, 316L and 317L in most environments.
Strength: Duplex stainless steels are about twice as strong as regular austenitic or ferritic stainless steels.
Toughness and ductility: Duplex stainless steels have significantly better toughness and ductility than ferritic grades; however, they do not reach the excellent values of austenitic grades.
Corrosion resistance: As with all stainless steels, corrosion resistance depends mostly on the composition of the stainless steel. For chloride pitting and crevice corrosion resistance, their chromium, molybdenum and nitrogen content are most important. Duplex stainless steel grades have a range of corrosion resistance, similar to the range for austenitic stainless steels, i.e from Type 304 or 316 (e.g. LDX 2101©) to 6% molybdenum (e.g. SAF 2507©) stainless steels.
Stress corrosion cracking resistance: Duplex stainless steels show very good stress corrosion cracking (SCC) resistance, a property they have “inherited” from the ferritic side. SCC can be a problem under certain circumstances (chlorides, humidity, elevated temperature) for standard austenitics such as Types 304 and 316.
Cost: Duplex stainless steels have lower nickel and molybdenum contents than their austenitic counterparts of similar corrosion resistance. Due to the lower alloying content, duplex stainless steels can be lower in cost, especially in times of high alloy surcharges. Additionally, it may often be possible to reduce the section thickness of duplex stainless steel, due to its increased yield strength compared to austenitic stainless steel. The combination can lead to significant cost and weight savings compared to a solution in austenitic stainless steels.
The various Alloys
The development of the Duplex stainless steels has continued, graded for their corrosion performance depending on their alloy content. Today, modern duplex stainless steel can be divided into four groups:
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- High strength
- High resistance to pitting, crevice corrosion resistance
- High resistance to stress corrosion cracking, corrosion fatigue and erosion
- Good sulfide stress corrosion resistance
- Low thermal expansion and higher heat conductivity than austenitic steels
- Good workability and weldability.
- High energy absorption
With the large scale of supplying Network & Ability to cater Giant Project in various large Industries to supply our products as all types of Duplex Steel UNS S31803 – UNS S32205 right now we are exporting our products in all Major countries all over the world.some of them are United States, United Arab Emirates, Canada, Pakistan, Spain, France, United Kingdom, Indonesia, Iran, Kuwait,Qatar,Yamen Mexico, Malaysia, Nigeria, Singapore, Saudi Arabia, Netherlands, Brazil, Colombia, Egypt, Iraq, Sri Lanka, Russia, Vietnam, South Africa, Nigeria, Turkey, Bangladesh, Italy, Japan, Thailand, Hong Kong, Switzerland, New Zealand We welcome your inquiries.