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  • How much do you know about black chrome?What is the Black chrome?Black chrome is a coating of chromium that has been chemically altered to achieve a black color.


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  • Precision casting, also known as "lost wax casting" or "investment casting", has been widely used for hundreds of years, and it is well known that its components have excellent surface finish, dimensional accuracy and complex shape. This is particularly useful for making castings of complex shapes,


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  • In the daily use of machinery, we must pay attention to observe the condition of the machine, especially the construction machinery. Most of the time, it is a minor problem that is not very noticeable. If it is not solved in time, it will become a major failure slowly. Hydraulic system failure is a phenomenon that hydraulic components or systems lose their prescribed functions, also known as failure. The ultimate failure of hydraulic system is the damage of components in hydraulic system or circuit, accompanied by oil leakage, heating, vibration, noise and other phenomena, resulting in the system can not play its normal function.


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  • Fasteners are a kind of mechanical parts which are widely used for fastening connections. A variety of fasteners can be seen on various machinery, equipment, vehicles, ships, railways, bridges, buildings, structures, tools, instruments, instruments and supplies.


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  • The safe and stable operation of the train can not be separated from 24 hours of maintenance guarantee every day. When the replacement parts are needed and no replacement parts can be found, the railway department should contact the manufacturer to provide them quickly.


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  • Large cranes for open-air operations, such as quayside container cranes, loading and unloading bridges, portal cranes, mobile tower cranes, bridge erectors and large crawler cranes, have different mechanisms, but they all have the same characteristics: high equipment, large size and large windward a


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  • As we know that valve is a device that regulates, directs or controls the flow of a fluid (gases, liquids, fluidized solids, or slurries ) by opening, closing, or partially obstructing various passageways. Technically,Valves are fittings, but are usually discussed as a separate category because of the wide range of applications and quite diverse of types. When the valve stays open, fluid flows in a direction from higher pressure to the lower.


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  • With the introduction of hybrid, full electric, and even hydrogen vehicles, our vehicles will continue to get more compleThat trend doesn’t seem to be slowing down anytime soon. Like all other aspects of life, the processes in the automobile industry have been changed drastically through this development.Limited to the category of cars, sometimes you can see the grade of a car at a glance. Why does it make such a big difference in appearance? Does exquisite appearance of a car add a lot of cost?


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  • With the continuous development of science and technology, electrostatic spraying is more and more widely used in various aspects, such as decorative spraying of household appliances, instruments, hardware parts, bicycles and so on. It is also used in surface anticorrosive coating of various electric shock, chemical pipelines, valves, etc.


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  • Excavator bucket is one of the most frequently used parts of excavator in operation. The bucket is also the fastest wearing component, which needs to be replaced frequently. Excavator bucket replacement is a technical work, which requires operators to pay attention to many matters in order to comple


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  • What is 'multiple certification'?

    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.

  • What surface finishes are available on stainless steels?

    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.

  • Can I use stainless steel at high temperatures?

    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:

    1. Maximum temperature of operation
    2. Time at temperature, cyclic nature of process
    3. Type of atmosphere, oxidising , reducing, sulphidising, carburising.
    4. Strength requirement

    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.

  • Can I use stainless steel at low temperatures?

    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. 

  • Is stainless steel non-magnetic?

    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.

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