Formation mechanism and prevention and control of main defects in nodular cast iron intake cylinder casting
(1) The elements with high content of C, O, Al, Si and some other alloy elements are found in the […]
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Over flow area of casting valve body for globe valve
The stop valve has five over-flow areas that need attention. According to the flow direction sequence, they are end channel
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Application of Proportional Solidification Technology of nodular cast iron in prevention and control of shrinkage cavity and porosity
By analyzing and mastering the proportional solidification technology of nodular cast iron into the cylinder, the cooling rate is changed
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Processing technology of casting valve body for globe valve
The independent valve seat of the globe valve is usually connected by welding. Because the welding rod should go deep
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Formation mechanism and causes of metallographic defects in special parts of ductile iron
When the carbon content is increased to solve the shrinkage cavity and porosity defect, the top graphite floating and the
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Construction standard for cast body of globe valve
According to the current standard API 623-2013 “steel globe valves – Flanged and butt welded ends, bolted bonnet”, bs1873-1975 “steel
Scientific
Solidification theory of isolated hot spot and thick section of nodular cast iron intake cylinder
In theory, the whole process can be summarized into three important stages: primary shrinkage (liquid shrinkage), volumetric expansion (graphitization expansion)
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Structure design of casting valve body for globe valve
Stop valve is an indispensable fluid control product in modern industry, which plays a role of cutting off and throttling
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Volume change curve of nodular cast iron during solidification
The distribution of physical hot spots is special and the solidification process is complex. The distribution of hot spots directly
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Hot spot distribution analysis of nodular cast iron in Cylinder Casting
Casting hot spot refers to the local area of final solidification formed by the internal solidification speed being slower than
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Forming mechanism and prevention and control measures of shrinkage defects of nodular cast iron in cylinder
During ut inspection, the main defects exceeding the standard were shrinkage cavity and porosity defect. In the subsequent finishing process,
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Molten iron melting and test block preparation
(1) Preparation of main metal charge Weigh and prepare the main metal charge. (2) Preparation of main accessories Weigh and
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Application of ductile iron gating system in prevention and control of surface slag inclusion defects
The whole process from molten iron smelting to casting completion is a complex and irreversible process. In the process of
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Classification of common gating system for ductile iron cylinder
① According to the ratio of cross-sectional area, it is divided into closed gating system and open gating system. The
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Formation of slag inclusion on the surface of nodular cast iron cylinder
The main defect of the inlet cylinder casting in the NDT of VT, MT and Pt is that there are
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The defect detection method of the nodular cast iron into the cylinder
(1) The surface quality and defects of the air inlet cylinder are mainly inspected by visual inspection (VT), magnetic particle
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Flow characteristics of each component in the gating system of ductile iron into cylinder
① The main function of the sprue is to guide molten iron into the runner or runner. According to the
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Study on the casting technology of nodular cast iron into cylinder
According to the analysis of the casting structure and key casting technology difficulties of the intake cylinder, this paper mainly
Scientific
Hydraulic analysis of liquid iron filling in cylinder of nodular cast iron
The molten iron enters the mold filling process through the gating system, which can be seen as a liquid with
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Production and research status of inlet cylinder castings
Before 2013, the company’s production performance of gas turbine castings was dominated by only a few small and medium-sized steel
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Morphology and composition analysis of linear defects on inlet cylinder surface
The main characteristics of the magnetic traces of linear defects detected by MT are mainly linear aggregated magnetic traces with
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Production and research status of inlet cylinder castings at China and abroad
Foreign technology status: Hangzhou Steam Turbine Casting and Forging Co., Ltd. pointed out in the patent technical background of “a
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Morphology and composition analysis of point defects on inlet cylinder surface
The main features of magnetic traces of point defects detected by MT. The magnetic traces are scattered and isolated small
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Research status of large nodular iron castings
According to the data reported by China Foundry Association at the industry annual meeting in recent years, the total amount
Scientific
Analysis of solidification characteristics of nodular cast iron for intake cylinder
The inlet cylinder is one of the typical high difficulty ductile iron castings. Its solidification characteristics are closely related to
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Production status of large nodular iron castings
Ductile iron is an important kind of strong and tough cast iron, which has been fully used in heavy and
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Technological characteristics of nodular cast iron in cylinder
The inlet cylinder casting is composed of flange, brace, volute and other parts of cross connection. In the study, the
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The development prospect of domestic nodular cast iron gas turbine
Since 2002, with the adjustment of national energy policy and the increase of West to east gas transmission project and
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Distribution of isolated hot spot and shrinkage porosity in heavy section position of ductile iron intake cylinder
Shrinkage cavity and shrinkage porosity are common internal casting defects in heavy position of ductile iron castings. The shrinkage cavity
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Research status of nodular cast iron gas turbine in China
Heavy duty gas turbine (HGT) is a large-scale energy and power equipment which integrates many high technologies such as unit