With more than 30 years of casting history, Wenzhou Longzhu Industrial Co., Ltd. has a large number of experienced casting engineers and technicians. We can produce castings of various sizes, shapes and materials according to the drawings provided by customers, especially in the field of valve castings. Cooperate with Fortune 500 companies for many years.
GS-C251.0619,WCB.WCC,LCB,LCC,LC3,4C,4D,WC6,C5,C12, C12A,CA15，CF3,CF8(-196’C),CF3M,CF8M,CF8C,CD4MCu,CK3MC uN,ZG200-400,ZG230-450,ZG270-500,2G40Cr1,ZG20CrM0.2G15C r1Mo1V,ZG35Cr1MO.ZG16CrMOG(1Cr5Mo),ZG1Cr13,ZGOCr18Ni9 Ti.5A.KmTB Cr26.4A
Resin sand casting, etc.
Sales manager： Mrs.peng E-mail: firstname.lastname@example.org
Tel： 0086-0577-86621768 Fax： 0086-0577-86621935
Address ： No.19 Longyong Road.Xiongxin Village. Longwan,Wenzhou,Zhejiang,Chin
Introduction of Duplex stainless steel
The shut-off valve, also called the cut-off valve, is one of the most widely used types of valves. It is popular because it has a small friction between the sealing surfaces during opening and closing, is relatively durable, and has a small opening height and is easy to manufacture. Easy to maintain, not only for medium and low pressure, but also for high pressure. The closing principle of the shut-off valve is that, relying on the pressure of the valve bar, the sealing surface of the valve disc and the sealing surface of the valve seat are closely fitted to prevent the medium from flowing. China's valve "three-way to give" has stipulated that the flow direction of the stop valve, all from top to bottom, so the installation is directional. The structure of the shut-off valve is longer than the gate valve, and the fluid resistance is large. When it is operated for a long time, the sealing reliability is not strong.
Properties of Duplex Stainless Steel
Due to the features of the two phase, with proper control of chemical composition and heat treatment process, make the duplex stainless steel and ferritic stainless steel and austenitic stainless steel, it will be of austenitic stainless steel has good toughness and weldability and ferritic stainless steel with high strength and resistance to chloride stress corrosion performance together, it is the superior performance of the duplex stainless steel as the structure of the welding material has developed rapidly, since the 80 s has become and markov size, austenite stainless steel with a steel and iron grain size classes. Duplex stainless steel has the following performance characteristics:
(1) Molybdenum-containing duplex stainless steel has good resistance to chloride stress corrosion under low stress.General 18-8 austenitic stainless steel in 60 ° C above neutral chloride solution are prone to stress corrosion cracking, such in trace chloride and hydrogen sulfide industry was made in stainless steel heat exchanger, evaporator and other equipment are the tendency of stress corrosion cracking, and duplex stainless steel has good resistance ability.
(2) Molybdenum-containing duplex stainless steel has a good resistance to pore corrosion.When the pore corrosion resistance is the same (PRE=Cr%+ 3.3mo %+16N%), the critical pore corrosion potential of duplex stainless steel is similar to that of austenitic stainless steel.The corrosion resistance of duplex stainless steel and austenitic stainless steel is equivalent to AISI 316L.AISI 316L was found to be superior to the 25%Cr, especially the nitrogen, high chromium duplex stainless steel.
(3) With good corrosion fatigue and wear corrosion resistance.In some corrosive medium conditions, suitable for the production of pumps, valves and other power equipment.
1. Fluid resistance
Bellows stop valve
The force is large, and the force required to open and close is large.
2. It is not suitable for media with particles, high viscosity and easy coking.
3. The adjustment performance is poor.