It is reported that there are family rules, line labels, hardware locks, as an important category in hardware, what is the standard? In the process of electric lock and hardware selection, different standards are often encountered. At present, the commonly used standards are European standard and American standard. The current standards in the world of locks and hardware mainly include the following:
The one-way comparison for the European standard and the American standard is as follows.
1. American National Standard: ANSI 156.4, American Underwriters Laboratories UL10C.
Number of opening of the first level standard: ≥ 2 million times;
Number of secondary standards open: ≥ 1 million times;
The number of opening of the third level standard: ≥ 500,000 times.
2, European standard CE: EN1154 (performance test) and EN1634 (fire test), open times indicator: ≥ 500,000 times.
It can be seen from the above comparison that the durability parameters of American standard products are generally higher than those of European standard products, which is also the reason why the American standard electric locks or hardware products are relatively expensive on the market.
For a large commercial building, the number of doors may be thousands or even thousands. How to choose the best cost-effective electric lock and hardware solution for different parts and different use requirements to ensure a long service life and the lowest maintenance in the future is a very complicated and cumbersome work. The best overall hardware lock solution should be a unit of convenience, safety and durability.
Selection principle
In summary, when selecting intelligent building electrical locks and hardware solutions, it is recommended to follow the following basic selection principles: the location and importance of the building should be considered in the door, hall door, room, bathroom or passage. In order to select the product suitable for the required function; the environment and conditions to be used, it is required to consider the advantages and disadvantages of the use environment, such as the frequency of use, whether it is a fire door, the structure of the door, the weight, the thickness, etc.; considering the condition of the frequently used personnel, Consider whether there are elderly people, children or people with disabilities; considering the coordination with the decorative environment, consideration should be given to the coordination and matching of the decorative environment.
All living enterprises must be people-oriented and do green and healthy products suitable for our living.
Editor in charge: Sun Gongxue
Duplex Stainless Steel
Duplex Stainless Steels Available
Haohua Industrysupplies 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
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