It was learned from the meeting that in the first half of this year, the National Special Equipment Safety Supervision System further promoted the “Three Actions for Quality and Safety†activities and special equipment safety, and focused on special rectification activities for lifting machinery and pressure piping components. In various forms such as the combination of lines and surfaces, special equipment promotion and education activities are carried out. In the first half of the year, various geological supervision departments focused on the use of special equipment, and actively promoted the construction of energy efficiency testing institutions, energy-saving special equipment energy review, new products and in-use equipment energy efficiency testing and other key work.
According to the person in charge of the Special Equipment Safety Supervision Bureau of the General Administration of Quality Supervision, Inspection and Quarantine, the current situation of special equipment safety is still not optimistic, and it is necessary to further strengthen the sense of awareness and responsibility. According to the person in charge, in the second half of this year, under the unified deployment of the General Administration of Quality Supervision, Inspection and Quarantine, the national special equipment safety supervision system will focus on “one safeguard, two tasks, and "Three actions and four services" are to fully guarantee the safety of special equipment for the 60th anniversary of the National Day, effectively fulfill the two major tasks of energy conservation supervision and accident investigation, and carry out in depth the "three actions" for special equipment safety, focusing on the overall economic and social development. Good service for energy conservation and consumption reduction, development of equipment manufacturing industry, national key projects and major activities, and “three rural†work.
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 Flange,Duplex Stainless Steel Flange,Super Duplex Steel Flange
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