Jilin Huanyu New Materials Manufacturing Co., Ltd
Introduction For Heat Treatment (Ⅰ)
Heat treatment refers to a metal hot working process in which a material is heated, insulated, and cooled in its solid state to obtain the expected structure and properties. Metal heat treatment is one of the important processes in mechanical manufacturing. Compared with other processing techniques, heat treatment generally does not change the shape and overall chemical composition of the workpiece. Instead, it gives or improves the performance of the workpiece by changing the
Introduction for The Die Casting
Die casting refers to the casting method of injecting molten or semi molten metal into a metal mold at high speed and crystallizing under pressure. The commonly used injection pressure is 30-70MPa, the filling speed is about 0.5-50 m/s, and the filling time is 0.01-0.2 seconds. Die casting is a casting method that fill liquid or semi solid metals or alloys, or liquid metals or alloys containing enhanced phases, into the cavity of a die casting mold at a high spee
Introduction for Permanent Mold Casting
Permanent mold casting, also known as hard mold casting, is a casting method that involves pouring liquid metal into the metal mold to obtain castings. The mold is made of metal and can be reused multiple times. There are certain restrictions on the weight and shape of castings that can be produced by permanent mold casting, for example, Ferrous can only be castings with simple shape; The weight of the casting should not be too large; There are also limitations on wall thickness, and smaller castings cannot be produced.
Introduction for Ceramic Mold Casting
Ceramic mold casting refers to the casting method of producing castings using ceramic slurry as casting molds. The ceramic slurry is mixed of hydrolyzed ethyl silicate and fine refractory sand with relatively pure texture and high thermal stability, such as fused silica, zircon, corundum, etc. Calcium hydroxide or magnesium oxide is often added as a catalyst to make the ceramic slurry gelatinize in a short time. Due to the composition and appearance of the used r
Introduction for The Precision Casting
Precision casting refers to the general name of the processes for obtaining precise size castings. Compared to traditional sand casting process, the castings produced by precision casting are more accurate dimensions and better surface finish. It includes investment casting, ceramic mold casting, permanent mold casting, pressure casting, and lost foam casting. Precision casting, also known as lost-wax casting, products which are made by precision casting are prec
Introduction for Iron Carbon Alloy
Iron carbon alloy is a binary alloy composed of iron and carbon. The most commonly used type of iron-based materials - carbon steel and cast iron - is an industrial iron-carbon alloy material. The reason for the wide application range of iron and steel materials is firstly due to the wide range of available components, from nearly carbon free industrial pure iron to cast iron containing about 4% carbon. Within this range, the phase structure and microstructure of the alloy undergo significant changes. In addition, various hot worki
Introduction for Austenitic Heat-Resisting Steel
Austenitic heat-resisting steel is a kind of heat-resistant steel which matrix is austenitic structure. This type of steel contains more austenite forming elements such as nickel, manganese, and nitrogen. It has good high-temperature strength and structural stability above 600 ℃, and good welding performance. It is the most widely used type of heat-resistant steel at 600~1200 ℃. Composition
Introduction for The Chrome Steel
Chromium steel refers to alloy steel containing chromium. Chromium can increase the hardenability of steel, improve its strength and wear resistance. But chromium steel also has the tendency of superheat and appearing temper brittleness. Chromium steel is prone to white spots after forging, while low-carbon chromium steel has a higher surface carbon concentration and is more brittle after carburization. It is a good carburizing steel, containing chromium can increase the hardenability of the steel, reduce deformation during quenchi
Introduction for Carbon Structural Steel
Carbon structural steel is a type of carbon steel. The carbon content is about 0.05% to 0.70%, with some reaching as high as 0.90%. It can be divided into ordinary carbon structural steel and quality carbon structural steel. It is widely used in railways, bridges, various construction projects, manufacturing various metal components bearing static loads, and machine parts and general welding parts that are not important and do not need heat treatment. 1.Ordinary
Introduction for The Carbon Steel
Carbon steel is an iron carbon alloy with a carbon content ranging from 0.0218% to 2.11%. Generally, it also contains small amounts of silicon, manganese, sulfur, and phosphorus. Generally, the higher the carbon content in carbon steel, the greater the hardness and strength, but the lower the plasticity. Classification 1.According to the use, carbon steel can be divided into c
Introduction for Cement Rotary Kiln
Cement Rotary kiln is a kind of lime kiln, belonging to building materials equipment. Rotary kiln can be divided into cement rotary kiln, metallurgical and chemical rotary kiln and lime rotary kiln according to different materials. Cement rotary kiln is the main equipment of cement clinker dry and wet process production lines. The cement rotary kiln is composed of cylinder, transmission device, support device for supporting and blocking wheel, kiln lining, kiln t
Introduction for Alloying Element ( Ⅴ )
15. Aluminium (Al): Aluminium is a commonly used deoxidizer in steel. Adding a small amount of aluminum to steel can refine grain size and improve impact toughness, such as 08Al steel used for deep drawing sheets. Aluminum also has oxidation resistance and corrosion resistance. When combined with chromium and silicon, aluminum can significantly improve the high-temperature non peeling performance and high-temperature corrosion resistance of steel. The disadvantage of aluminum is that it affects the hot working perf
Introduction for Alloying Element ( Ⅳ )
11. Tungsten (W): Tungsten has a high melting point and a significant proportion, making it an alloy element of precious metals. Tungsten and carbon form tungsten carbide, which has high hardness and wear resistance. Adding tungsten to tool steel can significantly improve the red hardness and heat strength, and can be used as cutting tools and forging dies. 12. Niobium (Nb): Niobium can refine grain size, reduce overheating sensi
Introduction for Alloying Element ( Ⅲ )
8. Molybdenum (Mo): Molybdenum can refine the grain size of steel, improve hardenability and thermal strength, and maintain sufficient strength and creep resistance at high temperatures (long-term stress and deformation at high temperatures, known as creep). Adding molybdenum to structural steel can improve its mechanical properties. It can also suppress the brittleness of alloy steel caused by quenching. It can improve redness in tool steel.
Introduction for Alloying Element ( Ⅱ )
5. Sulfur (S): Sulfur is also a harmful element under normal circumstances, which cause thermal brittleness of steel, reduce its ductility and toughness, and cause cracks during forging and rolling. Sulfur is also detrimental to welding performance and reduces corrosion resistance. So the sulfur content is usually required to be less than 0.055%, and high-quality steel is required less than 0.040%. Adding 0.08-0.20% sulfur to steel can improve its machinability, commonly known as free cutting steel.
Introduction for Alloying Element (Ⅰ)
1. Carbon (C): As the carbon content in steel increases, the yield point and tensile strength increase, but plasticity and impact toughness decrease. When the carbon content exceeds 0.23%, the welding performance of the steel deteriorates. Therefore, the carbon content of low alloy structural steel used for welding generally does not exceed 0.20%. High carbon content can also reduce the atmospheric corrosion resistance of steel, and high carbon steel in open yards is prone to corrosion; In addition
Introduction for The Alloy Steel
In addition to iron and carbon, adding other alloying elements to steel is called alloy steel. Iron-carbon alloy is composed of one or more alloying elements in moderation added on the basis of ordinary carbon steel. According to the different added elements and appropriate processing techniques, special properties such as high strength, high toughness, wear resistance, corrosion resistance, low temperature resistance, high temperature resistance, and no magnetism can be obtained.
Introduction for The Refractory Material
Refractory is a type of inorganic non-metallic material, of which the fire resistance is not less than 1580 ℃. But defining refractory materials solely based on their fire resistance is no longer sufficient, and 1580 ℃ is not absolute. The current definition is that materials which physical and chemical properties allow them to be used in high-temperature environments are called refractory materials. Refractory materials are used in various fields of the national economy, such as steel, non-ferrous metals, glass, cement, ceramics, petrochemic
Introduction for Vacuum Process Casting
Vacuum Process Casting uses plastic film to seal the moulding flask, and relies on a vacuum pumping system to extract air from the mold. There is a pressure difference between the inside and outside of the mold, making the dry sand dense and forming the required cavity. Through core setting, mould assembly, pouring and vacuum pumping, make the casting be solidified. Then relieve negative pressure, and the moulding sand collapses to obtain the casting. Compared with traditional
Introduction for Lost Foam Casting
Lost Foam Casting ( also known as full mold casting ) is a new casting method. First, make a full mold, of which the structure and size are exactly same with the part to be cast, with foam ( EPS, STMMA or EPMMA ) polymer materials. After dip-coating with fire-resistant coating and drying, the full mold is buried in dry quartz sand, and molded through three-dimensional vibration. Then pour molten metal into the casting molding sand box under negative pressure to make polymer material mold be Heated gasification, extracted and replaced by molten m
Advantage of Investment Casting Process
The dimensional accuracy of investment castings is relatively high, generally up to CT4-6. Due to the complex process of investment casting, there are many factors that affect the dimensional accuracy of castings. For example, shrinkage of the mold material, deformation of the fusible pattern, linear changes in the mold shell during heating and cooling, shrinkage rate of the alloy, and deformation of the casting during solidification, etc. So although the dimensional accuracy of ordinary investment castings is relatively high, their consistency still needs to be i
Introduction for Investment Casting Process
Investment casting, also known as lost wax casting, includes processes such as wax injection, wax repair, trees cluster, thick liquid, dewaxing, pouring molten metal and postprocessing.
Casting Large Heat-Resistant Steel Castings ( II )
Factors affecting shrinkage of large castings: In the solidification process of large castings, the size of each part of the castings will generally be reduced. The percentage of casting size reduction is called casting linear shrinkage rate or casting shrinkage rate. When manufacture mold, including the core box, the mold shall be enlarged according to the determined casting shrinkage rate to ensure that the size of the casting after cooling meets the
Casting Large Heat-Resistant Steel Castings ( I )
Large Castings: The most fundamental way to solve the casting shrinkage porosity defect is "heat balance". The method as follow. (1) Rapid solidification is carried out at the thick and hot spots formed by the machine tool casting structure, which artificially causes the basic balance of the temperature field of machine tool castings. Use internal and external cooling iron, and locally use zircon sand, chromite sand and special coating which have large
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