The valve is a mechanism or natural entity that guides, directs or regulates the flow of liquid by opening, closing or partially obstructing the different passages. Duplex Steel Valves are steel valves that comprise in the microstructure both the ferrite phase and the austenite phase. Duplex steels combine the austenitic and ferritic alloy family characteristics to provide advantages from each with less downsides, mostly at a lower price than other steel alloys.
Duplex Steel Valves are divided into two grades Duplex Steel UNS 31803 Valves and Duplex Steel UNS 32205 Valves Duplex steel has many advantages on the basis of the above actions, the following will be listed in more detail.
Advantages of Duplex Steel Valves
While Duplex Steel Valves constitute only a small percentage of the global stainless steel valve market, relative to conventional austenitic stainless steel valves and ferric stainless steel valves, they have a number of benefits.
- Improved Strength
The power of most duplex stainless steel grades is twice that of the austenitic and ferric grades of stainless steel.
- High Ductility and Durability
Under strain, Duplex stainless steel valves are much more formable than ferrite grades and have greater longevity. While they have lower values than austenitic steels, the duplex steel valves’ unique structure and characteristics generally outweigh any concerns.
- High Corrosion Resistance
Duplex stainless steel valves give equal (or better) corrosion resistance to traditional austenitic grades depending on the grade in question. High resistance to both crevice corrosion and chloride pitting is demonstrated in alloys with increased molybdenum, chromium, and nitrogen steels.
Although having lower molybdenum and nickel levels, duplex steel valves have all of the above benefits. This implies that it is a lower-cost option than many stainless steel standard austenitic grades. The price of duplex steel valves is also less unpredictable than most other grades of steel, making it easier to estimate costs, both upfront and at the stage of lifetime.
- Good corrosion resistance, fatigue and corrosion resistance
Duplex stainless steel valve has strong resistance to corrosion, fatigue and wear and corrosion, and certain conditions have also been used for the processing of raw materials for pumps, valves and other machinery.
- The overall mechanical properties are good
The overall mechanical properties of duplex stainless steel are higher, the strength and strength of fatigue are greater, and the yield strength of form 18-8 austenitic stainless steel is two times greater.
- Good weldability
The weldability of duplex stainless steel is excellent and there is a slight pattern of hot cracking. Without heat treatment after welding, there is typically no need to preheat before welding, and it can be welded to dissimilar steels, such as austenitic stainless steel type 18-8 or carbon steel.
- The range of hot working temperature is high
The hot working temperature range of low chromium duplex stainless steel is wider than that of austenitic stainless steel type 18-8, and the resistance is low. Without welding, the steel sheet may be rolled directly. Hot work is more complicated than austenitic stainless steel with duplex stainless steel containing high chromium.
- Large thermal conductivity
Duplex stainless steel has high thermal conductivity and a low coefficient of linear expansion compared with austenitic stainless steel. It is ideal for composite plate lining and manufacturing. It is also fitting to use it as the heart of the heat exchanger.