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Views: 7 Author: Site Editor Publish Time: 2018-04-03 Origin: Site
H2. In the process of using stainless steel precision casting, its temperature can guarantee that its melt has good fluidity in the process of transfer，In the process of selecting temperature, the stainless steel precision casting needs to be determined according to the distance of the transfer and the cooling conditions and the flow rate.
Stainless steel precision casting has low crack tendency when used. It is necessary to ensure that the alloy has good exhaust and shrinkage ability. When used, it is to create the order crystallization condition and effectively improve the density of its products. In general, the casting temperature is on the high side.
H3. Stainless steel precision casting for small diameter ingots. Because the size of the transition belt is small, its mechanical properties are good. In general, the fluidity and the absence of bright crystallization can be satisfied. Its temperature is 715~740, and the product has a high thermal crack tendency.
H4. The mechanical properties of stainless steel precision casting are generally higher than that of cast iron in the process of use. However, the cast iron performance of such materials is less than that, and the melting point of the product is higher than that of other materials in the process of production. In the process of processing its steel solution is very easy to produce its oxidation state.
There are many problems to be paid attention to when machining stainless steel precision casting. It is mainly because of the poor flow performance of its molten steel. In the process of processing, in order to effectively prevent the casting of steel casting, it is cold, so that the wall thickness of the cast steel is not less than 8mm.
H5. The structure of the casting system of stainless steel precision casting is very simple. In the process of the use, the section size of the equipment is large in cast iron, and it can be used in the process of processing.
Precision casting parts, Investment casting products
This is where a batch of steel meets more than one specification or grade. It is a way of allowing melting shops to produce stainless steel more efficiently by restricting the number of different types of steel. The chemical composition and mechanical properties of the steel can meet more than one grade within the same standard or across a number of standards. This also allows stockholders to minimise stock levels.
For example, it is common for 1.4401 and 1.4404 (316 and 316L) to be dual certified - that is the carbon content is less than 0.030%. Steel certified to both European and US standards is also common.
There are many different types of surface finish on stainless steel. Some of these originate from the mill but many are applied later during processing, for example polished, brushed, blasted, etched and coloured finishes.
The importance of surface finish in determining the corrosion resistance of the stainless steel surface cannot be overemphasised. A rough surface finish can effectively lower the corrosion resistance to that of a lower grade of stainless steel.
Various types of stainless steel are used across the whole temperature range from ambient to 1100 deg C. The choice of grade depends on several factors:
In the European standards, a distinction is made between stainless steels and heat-resisting steels. However, this distinction is often blurred and it is useful to consider them as one range of steels.
Increasing amounts of Chromium and silicon impart greater oxidation resistance. Increasing amounts of Nickel impart greater carburisation resistance.
Austenitic stainless steels are extensively used for service down to as low as liquid helium temperature (-269 deg C). This is largely due to the lack of a clearly defined transition from ductile to brittle fracture in impact toughness testing.
Toughness is measured by impacting a small sample with a swinging hammer. The distance which the hammer swings after impact is a measure of the toughness. The shorter the distance, the tougher the steel as the energy of the hammer is absorbed by the sample. Toughness is measured in Joules (J). Minimum values of toughness are specified for different applications. A value of 40 J is regarded as reasonable for most service conditions.
Steels with ferritic or martensitic structures show a sudden change from ductile (safe) to brittle (unsafe) fracture over a small temperature difference. Even the best of these steels show this behaviour at temperatures higher than -100 deg C and in many cases only just below zero.
In contrast austenitic steels only show a gradual fall in the impact toughness value and are still well above 100 J at -196 deg C.
Another factor in affecting the choice of steel at low temperature is the ability to resist transformation from austenite to martensite.
It is commonly stated that “stainless steel is non-magnetic”. This is not strictly true and the real situation is rather more complicated. The degree of magnetic response or magnetic permeability is derived from the microstructure of the steel. A totally non-magnetic material has a relative magnetic permeability of 1. Austenitic structures are totally non-magnetic and so a 100% austenitic stainless steel would have a permeability of 1. In practice this is not achieved. There is always a small amount of ferrite and/or martensite in the steel and so permeability values are always above 1. Typical values for standard austenitic stainless steels can be in the order of 1.05 – 1.1.
It is possible for the magnetic permeability of austenitic steels to be changed during processing. For example, cold work and welding are liable to increase the amount of martensite and ferrite respectively in the steel. A familiar example is in a stainless steel sink where the flat drainer has little magnetic response whereas the pressed bowl has a higher response due to the formation of martensite particularly in the corners.
In practical terms, austenitic stainless steels are used for “non-magnetic” applications, for example magnetic resonance imaging (MRI). In these cases, it is often necessary to agree a maximum magnetic permeability between customer and supplier. It can be as low as 1.004.
Martensitic, ferritic, duplex and precipitation hardening steels are magnetic.