Since the beginning of this year, Vietnam’s imports of all types of construction machinery have declined, and only imports of road rollers have increased. From the end of the first quarter to the present, the average monthly imports of road rollers reached 250. In the first seven months of 2009, the country imported a total of 1498 road rollers, with a total value of US$32.35 million, equivalent to 109.5% of the total imports in 2008, 116.73% of imports, an increase of 59.19% over the same period of 2008, and imports 68.35% increase. It is estimated that the import volume of road rollers will remain high in the coming months. Japan and China are the largest suppliers of imported roller in Vietnam. Vietnam imports more Sakai brand and Liugong brand road rollers. In the first seven months of this year, Vietnam imported 380 Sakai roller machines from Japan with a total value of 9.17 million U.S. dollars, an increase of 24.52% over the same period of the previous year, and an increase of 25.14% in imports. Imports of China's Liugong road roller machines totaled 7.14 million U.S. dollars, a year-on-year increase. It increased by 70.14% and the import value increased by 84.84%.

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

Duplex Steel Seamless Pipe

Duplex Steel Seamless Pipe,Duplex Stainless Steel Pipe,Advertising Media Player Box

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