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Credibility ,Yaang Pipe Industry Co., Limited supplies super duplex stainless steel in bar, pipes, pipe fittings, flanges, tube and weld wire. Duplex Stainless Steels, also referred to as austenitic-ferritic stainless steels, are a family of grades having around equal proportions of austenite and ferrite.
These steels have a duplex microstructure which contributes to their high strength and high resistance to stress corrosion cracking. Duplex steels offer high resistance to uniform and local corrosion because of their high content of nitrogen, chromium and molybdenum. Duplex stainless steels have good weldability.
There are three groups of duplex stainless steels that include the following:
The most widely used of the duplex grades is duplex 2205. However, the super duplex steels like 2507 are excellent for servicing severe corrosive environments, such as offshore and marine applications. Lean duplex 2101 is available as an economic alternative to 300 series stainless steels.
S32760 super duplex stainless steel is developed to be used in aggressive environments. Properties of S32760 include toughness, high strength, corrosion resistance in a large number of organic and inorganic acids. Finally it features high resistance to strong alkalis and resists corrosion in a number of non-oxidizing acids.
While involving extended exposure to temperatures more than 572F use of S32760 is not recommended. The chemical composition of S32750 and S32760 are similar; however, the latter contains slightly more copper and tungsten. The copper content (min. 0.5, max 1.0) permits excellent resistance to corrosion in many non-oxidizing and mineral acids like hydrochloric and sulfuric acid.
Duplex 2507 is a super duplex stainless steel developed for applications that demand high strength and corrosion resistance. Alloy 2507 has 25% chromium, 4% molybdenum, and 7% nickel. This high molybdenum, chromium and nitrogen content causes high resistance to chloride pitting and crevice corrosion attack and the duplex structure provides 2507 with exceptional resistance to chloride stress corrosion cracking.
Using Duplex 2507 must be restricted to applications below 600° F (316° C). Extended elevated temperature exposure can reduce both the toughness and corrosion resistance of alloy 2507.
Duplex 2507 has good mechanical properties. Often a light gauge of 2507 material can be used to achieve the same design strength of a thicker nickel alloy. The resulting weight savings can considerably reduce the overall cost of fabrication.
Figure 1. Forms of Super Duplex 2507 Available at Yaang Pipe Industry Co., Limited.
The chemical composition of S32760 is provided in the table below:
Cr | Ni | Mo | C | W | Cu |
---|---|---|---|---|---|
24.0-26.0 | 6.0-8.0 | 3.0-4.0 | 0.030 Max | 0.5-1.0 | 0.50-1.0 |
N | Mn | Si | P | S | Fe |
---|---|---|---|---|---|
0.2-0.3 | 1.00 Max | 1.0 Max | 0.03 Max | 0.01 Max | Balance |
The chemical composition of S32750 or 2507 is provided in the table below:
Cr | Ni | Mo | C | N | Mn |
---|---|---|---|---|---|
24.0-26.0 | 6.0-8.0 | 3.0-5.0 | 0.030 Max | .24-.32 | 1.20 Max |
Si | Cu | P | S | Fe |
---|---|---|---|---|
0.80 Max | 0.50 Max | 0.035 Max | 0.020 Max | Balance |
The properties of duplex stainless steels are:
The properties of super duplex stainless steel S32760 are:
Mechanical Properties (Room Temperature, Solution Annealed Condition)
Tensile Strength, ksi | .2% Yield Strength, ksi | % Elongation in 50mm | Hardness Max. |
---|---|---|---|
109 | 80 | 25 | 28 HRC |
Mechanical Properties(Specified Tensile Properties, Plate ASTM A240)
Ultimate Tensile Strength, ksi Minimum | .2% Yield Strength, ksi Minimum | % Elongation Min. | |
---|---|---|---|
116 | 80 | 15 | 310 |
The applications of duplex stainless steels are:
The applications of S32760 super duplex stainless steel are:
The applications of S32750 super duplex stainless steel are:
This information has been sourced, reviewed and adapted from materials provided by Yaang Pipe Industry Co., Limited.
For more information on this source, please visit Yaang Pipe Industry.
Tel No:+86-18267732328 / Email:[email protected]
Address:Longwan District, Wenzhou, Zhejiang Province, China.
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Yaang Pipe Industry Co., Ltd. is an international supplier of piping solutions for flange, butt welding fittings, socket welding fittings and threaded fittings. Our products are widely used in different industrial fields, including oil and gas, chemical industry, petrochemical industry, power plant, pulp and paper industry, environmental and water conservancy engineering, engineering projects, etc.