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What is a head

What is a head? The head refers to the element used to close the end of the container to isolate the internal and external media, also known as the end cover. The head of cylinder descriptors is generally a rotating shell. According to the shape of the head surface, it can be divided into convex shape, conical shape, flat shape and combined shape. Convex head refers to the head whose outer surface is convex, such as semi spherical head, elliptical head, dished head and non folded spherical head. Some gas cylinders adopt convex inward combined bottom heads, which can not only ensure […]

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What is an angle bar

What is an angle bar? Angle bar, commonly known as angle iron, is a long strip of steel whose two sides are perpendicular to each other and form an angle. Angle bar can form various stress components according to different structural needs, and can also be used as connectors between components. It is widely used in various building structures and engineering structures, such as house beams, bridges, transmission towers, hoisting and transportation machinery, ships, industrial furnaces, reaction towers, container racks, cable trench supports, power piping, bus support installation, warehouse shelves, etc. Type and specification of angle bar It is mainly […]

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What is a stainless steel square tube

What is a stainless steel square tube? Stainless steel square tube is a kind of hollow long steel. Because the section is square, it is called square tube. A large number of pipelines are used to transport fluids, such as oil, natural gas, water, gas, steam, etc. in addition, when the bending and torsional strength are the same, the weight is relatively light, so they are also widely used in the manufacture of mechanical parts and engineering structures. Classification of stainless steel square tubes Stainless steel square pipe is divided into seamless steel pipe and welded steel pipe (slotted pipe). […]

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What is pearlitic steel

What is pearlitic steel? Pearlitic steel is also called pearlitic heat-resistant steel. This kind of steel has pearlite and ferrite microstructure in normalized state. The steel has low alloy element content, good process performance, and the maximum working temperature can reach 600 ℃. According to the purpose, this kind of steel can be divided into boiler tube steel, gas ladle steel, fastener steel and rotor steel. In the welding process of pearlite steel joints, especially in the process of heat treatment and high-temperature operation, there is diffusion and migration of carbon, resulting in decarburization layer in low chromium steel and […]

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What is cold rolled steel plate

What is cold rolled steel plate? Cold rolling is made by rolling hot rolled coil under recrystallization temperature at room temperature. Cold rolled steel plate is the steel plate produced by cold rolling process, which is referred to as cold plate for short. The thickness of cold-rolled sheet is generally between 0.1-8.0mm. The thickness of cold-rolled sheet produced by most factories is less than 4.5mm. The thickness and width of cold-rolled sheet are determined according to the equipment capacity and market demand of each factory. Difference between hot rolled and cold rolled Hot-rolling Hot rolling is to take slab (mainly […]

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What is hot rolled steel plate

What is hot rolled steel plate? The continuous casting slab or blooming slab is used as the raw material, heated by the stepping heating furnace and descaled by high-pressure water, and then enters the roughing mill. The roughing material enters the finishing mill after cutting, tailing and then enters the finishing mill for computer-controlled rolling. After the final rolling, it passes through laminar cooling (computer-controlled cooling rate) and coiler to form a straight hair coil. The head and tail of straight hair curl are often tongue shaped and fish tail shaped, with poor accuracy of thickness and width, and there […]

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What is precipitation hardening stainless steel

What is precipitation hardening stainless steel? Precipitation hardening stainless steel refers to a kind of high-strength stainless steel that adds different types and quantities of strengthening elements on the basis of the chemical composition of stainless steel, and precipitates different types and quantities of carbides, nitrides, carbonitrides and intermetallic compounds through the precipitation hardening process, so as to improve the strength of steel and maintain sufficient toughness, PH steel for short. Classification of precipitation hardening stainless steel The steel is divided into four categories according to the content of main alloying elements and hardening elements added: (1) Martensitic precipitation hardening […]

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Does stainless steel really not rust

What is stainless steel? As aluminum alloy is an alloy based on aluminum, stainless steel is also an alloy, but it is based on iron. The alloy elements of stainless steel include chromium, nickel, carbon, titanium, etc. Among them, chromium addition is the key to stainless steel rust free. This is determined by the characteristics of chromium. In stainless steel, the chromium content is at least 10.5%. It can form a protective self repairing redox film on the surface of stainless steel, which is why stainless steel is corrosion resistant. Self repair means that if the protective film is damaged, […]

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What are the meanings of RC1/8, G3/4 and NPT1/4? What is the difference betwee……

Yesterday, I did a simple push z-axis, which is used to push a suction device. This device, after pumping out the waste gas produced by plasma cleaning, rises to the highest point to avoid the higher material on the conveyor belt below it. The driving stroke is 150 mm, because there is no precision requirement, ± 1 mm is OK. Therefore, the shaft is driven by double acting cylinder and guided by ordinary single slide linear guide (Use fork sensor to detect whether it has been pushed to the highest position). Since the cylinder is used, naturally, a simple gas […]

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Austenitic stainless steel VS martensitic stainless steel

In mechanical design, we often use austenitic stainless steel and martensitic stainless steel, because they have good physical and mechanical properties. For example, the commonly used austenitic stainless steels AISI 303 and AISI 304 have an elastic modulus of about 200GPa and a yield strength of 190Mpa-230Mpa. The modulus of elasticity of commonly used martensitic stainless steels AISI 420 and aisi440c is 215gpa. The yield strength of 420 after quenching and tempering can reach 345Mpa-1420Mpa, and that of 440℃ can even reach 1900Mpa. Quenching is the process that the workpiece is heated to 30-50 ℃ above the critical austenitizing temperature, […]

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