According to foreign media reports, although we have heard that epoxy resins will cure under light, usually all substances must be exposed. However, now only a small amount of a new additive is needed to cure the resin. In addition, it can also be used underwater. The proprietary compound developed by the Vienna University of Technology can be added to existing epoxy resins in liquid or paste form. Initially, it was transparent. However, when any part of the resin is irradiated with flash light, a chemical reaction occurs, thereby generating heat. The heat is spread throughout the resin, causing a cascading effect that causes all materials to cure and harden within seconds-even including debris that may be hidden from light, invisible to internal cracks or anywhere else. The resin will change to a darker color at this time, letting the user know that the process is complete. Currently, depending on its formulation, the additive can be triggered by ultraviolet light or high-intensity visible light. Importantly, when the resin is mixed with carbon fiber, it is still effective, which means it can be used to produce or repair composite materials. In addition, even resins containing additives can be coated and then cured under water. Initially, scientists thought that the heat generated inside the resin would be dissipated into the water, thereby preventing the material from curing. However, it turns out that the chemical reaction caused the water around the resin to boil immediately, thus forming a protective layer of water vapor on the surface of the material. The university is now looking for industry partners that may commercialize the technology. Research suggests that this technology could eventually find use in applications such as aerospace, shipbuilding, structural repair, or pipeline repair. The research paper led by Professor Robert Liska was recently published in the "Composites Part A: Applied Science and Manufacturing" magazine. Super Duplex Stainless Steel Heat Exchanger Tube
Duplex Stainless Steels Available
Yuhong Group supplies LDX2101, 2205, Ferralium 255, Zeron 100 and LDX2507 in the form of plate, sheet, strip, bar, pipe, tubing, pipe fittings, flanges and weld wire.
Duplex Stainless Steel Overview
Duplex Stainless Steels, also referred to as austenitic-ferritic stainless steels, are a family of grades with about equal proportions of ferrite and austenite. These steels have a duplex microstructure which contributes to their high strength and high resistance to stress corrosion cracking. Due to their high content of chromium, nitrogen and molybdenum, duplex steels offer good resistance to local and uniform corrosion. Duplex stainless steels have good weldability.
Today, modern duplex stainless steels can be divided into three groups:
Of the duplex grades, duplex 2205 is the most widely used. However, the super duplex steels like Zeron® 100 and LDX2507 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.
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DUPLEX STAINLESS STEEL
Lean Duplex such as LDX2101
Standard Duplex such as 2205, the work-horse grade accounting for more than 80% of duplex usage
Super Duplex such as Ferralium 255 and Zeron 100 and LDX2507
What are the Characteristics of Duplex Stainless Steels ?
Very good resistance to uniform corrosion
Very good resistance to pitting and crevice corrosion
High resistance to stress corrosion cracking and corrosion fatigue
High mechanical strength
Good sulfide stress corrosion resistance
Good abrasion and erosion resistance
Good fatigue resistance high energy absorption
Low thermal expansion
Good weldability
In what Applications are Duplex Stainless Steels® used ?
Oil and gas equipment
Offshore technology
Seawater desalination plants
Chemical industry, especially when handling chlorides
Flue-gas cleaning
Desalination plants and seawater systems
Pulp and paper industry
Cargo tanks and pipe systems in chemical tankers
Firewalls and blast walls on offshore platforms
Bridges
Storage tanks
Pressure vessels, reactor tanks, and heat exchangers
Rotors, impellers and shafts