Casting technology of nodular cast iron valve body of excavator
1. Floating core There are regular pits on the upper surface of nodular cast iron. After dissecting the nodular cast […]
1. Floating core There are regular pits on the upper surface of nodular cast iron. After dissecting the nodular cast […]
1. Test process parameters Three nodular iron castings were tested and poured. The main parameters during the test are: the
The casting adopts the green sand production process, and the sand core is made of coated sand. The mold plate
Excavators are widely used in highway, bridge, construction, breeding pond, underground engineering, emergency excavation and other engineering construction fields. It
For example, the liquid filling state of the casting at different times is represented. The red represents the molten metal
1. introduction to valve body parts The valve body studied in this subject is a main part of the valve.
The temperature of cutting and welding repair shall not exceed 250 ℃, and the cooling method can be water cooling
See Table 1 and table 2 for the technical requirements and measured chemical composition of castings. Name C Si Mn
(1) Technical analysis of valve body castings: according to the requirements of user drawings, RT flaw detection shall be carried
Effective control of other process parameters can avoid cracks in valve castings. These processes mainly refer to the process of
Technical parameters of rusty steel valve castings: Name: gate valve (composed of valve body, valve break and rocker) Pressure: 1500
There are many problems to be solved in the valve casting process, and relevant personnel should focus on the following
SAF2507 is the third generation of super duplex stainless steel, American Standard (national standard ZG 00Cr25Ni7Mo4N). Its microstructure has an
The detection and analysis show that the main reason for the crack of the valve body is that it has
Before the casting of valve castings, relevant personnel need to know the valve structure and valve overview in detail, such
Through magnetic particle testing, it was found that there were multiple cracks on the shoulder behind the furnace on the
Power plant main steam gate valve is the main control element used to control the main steam at the outlet
1. Casting process analysis Before the casting of valve castings, relevant personnel need to know the valve structure and valve
SAF2507 is the third generation super duplex stainless steel, American Standard (national standard ZG 00Cr25Ni7Mo4N). Its microstructure has an ideal
High pressure valve is one of the main parts of oil and gas production wellhead device, and its body structure
When casting high temperature and high pressure valve castings, relevant personnel need to understand the relevant requirements of the service
The process scheme is put into production after being determined by casting CAE simulation, and all valve castings are qualified
CF8C material is generally selected as valve casting material because of its small deformation, high strength, wear resistance and corrosion
The alloy element Cr content of cf8c material is high. The high melting point of Cr increases the liquidus temperature
Although there are differences in local structure of valve castings of hydrocracking unit, the common structural feature is that the
The structure of dn400-2500lb valve casting is shown in the figure. The blank weight of the valve casting is 4300
The working environment of valve castings for petrochemical industry has the characteristics of high temperature, high pressure and hydrogen (including
The national standard GB / T 9439-1988 gray iron castings divides the inspection of mechanical properties into tensile strength and
With the rapid development of valve manufacturing industry, the professional production of domestic valve enterprises is becoming stronger and stronger,
1. Improve the concession of sand core In order to ensure that the high-temperature strength of the sand core of