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Influence of heat treatment process on die deformation

Influence of heating rate Generally speaking, the faster the heating speed is, the greater the thermal stress in the die is, which is easy to cause the deformation and cracking of the die. Especially for alloy steel and high alloy steel, because of their poor thermal conductivity, it is particularly necessary to pay attention to preheating. For some high alloy dies with complex shape, it is also necessary to adopt multi-stage preheating. However, in some cases, the rapid heating can reduce the deformation sometimes. At this time, only the surface of the die is heated, and the center remains “cold”, […]

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Five examples of high speed steel heat treatment

What is high speed steel? High speed steel is the abbreviation of high-speed tool steel, commonly known as “front steel” (because it can also be hardened in the air, also known as “wind steel”). Since the invention of high-speed steel by American Fred.W.Taylor and his assistant M. white in 1898, it has been a double armour. Looking at the complex relationship among chemical composition, structure and performance of all kinds of steel in the world, or the difficulty of the whole manufacturing process such as smelting, casting, forging, roll rolling, drawing, plastic forming and heat treatment, high speed steel undoubtedly […]

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What is surface roughness

What is surface roughness? Surface roughness refers to the roughness of the machined surface with small spacing and tiny peaks and valleys. The distance between the two peaks or troughs (wave distance) is very small (less than 1 mm), which belongs to the micro geometry error. The smaller the surface roughness is, the smoother the surface is. The surface roughness is generally formed by the processing method and other factors, such as the friction between the cutting tool and the surface of the part, the plastic deformation of the surface layer metal when the chips are separated, and the high […]

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Why 310 stainless steel can withstand high temperature?

At room temperature, the matrix structure of austenitic stainless steel 310 is pure γ。 The chemical composition in GB / T 24511-2017 is shown in the following screenshot. Because the nominal contents of chromium and nickel are 25% and 20% respectively, 310 is also called “2520”. 310 is often used as high temperature resistant material because of its good high temperature strength and low oxidation at high temperature; When the temperature is kept at 1200 ℃, the oxidation rate of 310 is very serious. In addition, it is also used in the transportation and storage of strong acids such as […]

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What is water hammer

What is water hammer? In the pressure pipeline, due to some external reasons (such as the valve suddenly closed, the pump unit suddenly stopped), the water velocity suddenly changes, resulting in water hammer. This kind of hydraulic phenomenon is called water hammer. Water hammer accident in steam pipeline Explanation of water hammer phenomenon Water hammer is the piping system in the process of conveying liquid, due to the sudden closure of the valve, the subsequent flow under the action of inertia, produce water shock wave, just like the hammer, so it is called water hammer. The water hammer caused by […]

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Water quenching heat treatment process of seamless steel pipe

The mature heat treatment process of 42CrMo seamless steel pipe uses oil or quenching liquid for quenching, but the cost is high, and quenching crack is a serious quality problem, which will lead to the scrap of steel pipe parts. In this paper, the heat treatment process of 42CrMo seamless steel pipe is proposed by using water as quenching cooling medium. Using water as quenching medium Firstly, the small batch heat treatment test of 42CrMo seamless steel pipe was carried out φ 98.43mm (outer diameter) × 93mm (wall thickness), tensile strength > 655mpa, yield strength 552 ~ 665mpa, elongation > […]

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Influence of alloy elements in welding wire on weldability

CO2 gas shielded welding copper plated wire is a kind of welding material with high efficiency, energy saving and material saving. It is suitable for the welding of low carbon steel and low alloy steel. The carbon content of CO2 welding wire is low, mostly below 0.1%, and contains Si, Mn, s, P, Cr, AI, Ti, Mo, V and other alloy elements. The influence of these alloy elements on welding performance is described as follows: What is the effect of Si on weldability? Silicon is the most commonly used deoxidizing element in welding wire. It can prevent iron from combining […]

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Nine problems of stainless steel welding

Nine problems of stainless steel welding 1. What are stainless steel and stainless acid resistant steel? Answer: the content of “chromium” is the main element added in metal materials (other elements such as nickel, molybdenum, etc. also need to be added) It can make the steel in passivation state and has stainless property. Acid resistant steel refers to the corrosion resistant steel in acid, alkali, salt and other strong corrosive media. 2. What is austenitic stainless steel? What are the commonly used brands? A: austenitic stainless steel is the most widely used and has the most varieties. For example: Series […]

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What is a subsea tree?

What is a subsea tree? Subsea tree is a kind of wellhead equipment used to produce oil, such as flowing well and mechanical well. It is the main equipment for controlling and regulating oil and gas production in the top of oil and gas wells, mainly composed of casing head, tubing head and oil (gas) tree body. The subsea tree is an assembly located at the opening to the top of the well, including valves for measurement and maintenance, safety systems, and a series of monitors. The tree connects the production pipeline and the oil outlet pipe from the well, and […]

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What type of welding wire and electrode are used for 304 stainless steel pipe ……

304 pipe welding electrode: E308-16 (A102). Welding wire: ER308. Welding: welding can also be written as “welding” or welding or fusion. It is a processing technology and connection mode that two or more kinds of materials (the same or different) are heated, pressurized, or used together to make the atoms of two workpieces combine. Welding is widely used in both metal and nonmetal fields. During the welding process, the workpiece and solder melt to form a melting area, and the connection between the materials is formed after the molten pool is cooled and solidified. In this process, pressure is usually […]

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