The “Functional Carbon Materials Team” of the Institute of Materials Technology and Engineering of the Chinese Academy of Sciences aims to achieve the localization and industrialization of diamond precision tools, and recently obtained the synthesis of single crystal diamond by CVD (Chemical-Vapor-Deposition). A breakthrough in progress. The team started from the design and modification of domestic microwave plasma CVD equipment and developed a high-density, high-stability diamond deposition device. Compared with foreign equipment, the cost is reduced to 30%. The team independently developed the diamond growth process, which is a special treatment of the seed crystal, while strictly controlling the growth parameters during the preparation process. Through the application of this process, mass production of colorless transparent CVD single crystal diamond sheets has been realized. The deposition rate can reach 70μm/h under the conditions of only hydrogen and methane, and the rate reaches 150μm/h after the addition of nitrogen. This is also a major breakthrough in domestic equipment.

In addition, the team developed an innovative process that eliminates the unfavorable factors of edge-grown polycrystals by controlling the edge effect of single crystal diamonds, enabling the long-term growth of high-quality, large-size single-crystal diamonds. Conventional methods require multiple cumbersome procedures such as cutting, polishing, and growth, and achieve chemical vapor phase synthesis of 8x8x2 mm3 (2.25 carats) large pieces of diamond single crystal. The above results are being transformed into industrial production, which will provide strong technical support for the development of domestic diamond precision processing tools and even carat-grade transparent diamonds and colored diamond jewelry. (Ningbo Institute of Materials Technology and Engineering)

DUPLEX STAINLESS STEEL

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:
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

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.

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

Super Duplex Steel Tube

Super Duplex Steel Tube,Super Duplex Stainless Steel Tube,304 Super Duplex Steel Tube

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