Last time I wrote about stainless steel, many partners came to ask me questions about stainless steel health, including: 1. Zhao Lu asked: ask Luo Gong. The inner material of the chef’s thermos cup is 403, not 304. Is it safe? 2. Kuzai’s hot pot said: May I ask the author, w ...

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I have a problem. In mechanical design, we often use aluminum alloy. For example, 6061-T6 and 7075-T651 are the two most used aluminum alloys. Because they have a good weight strength ratio, that is, they are light in weight and good in strength, they are very popular, especially in places ...

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Screws are small in size and easy to be ignored in electrical products. In addition to specifications, appearance color and corrosion resistance are mainly considered in selection. Nowadays, the screws used in small household appliances have higher requirements on corrosion resistance than the orig ...

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There are many welding methods for aluminum alloy, and each method has its own application. In addition to the traditional fusion welding, resistance welding and gas welding methods, other welding methods (such as plasma arc welding, electron beam welding, vacuum diffusion welding, etc.) can also ...

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Seamless steel pipe Seamless steel pipe is a kind of steel pipe without weld made by hot working method such as piercing and hot rolling. If necessary, the hot-processed pipe can be further cold processed to the required shape, size and performance. At present, seamless steel pipe (DN 15-600) i ...

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Pipeline transportation of gas has the advantages of convenience and low transportation cost, so the best way for gas transportation is pipeline transportation. However, due to the gas’s flammability, flammability and the uncertainty of the potential safety hazards of the pipeline, there ar ...

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What is a double-headed bolt? Bolt refers to the larger diameter of the screw, can also have no head, such as bolt. It is also called double head screw or double head stud. The most common form of double head bolt is threaded at both ends and polished rod in the middle. The most typical use: a ...

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There are more than 10 grades of bolts for steel structure connection, including 3.6, 4.6, 4.8, 5.6, 6.8, 8.8, 9.8, 10.9 and 12.9. The bolts of grade 8.8 and above are made of low carbon alloy steel or medium carbon steel and heat treated (quenched and tempered), which are generally called high s ...

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What is a bearing? Bearing is an important part of mechanical equipment. Its main function is to support the mechanical rotating body to reduce the friction coefficient of mechanical load in the process of transmission. The origin of bearing development Historical development of bearings ...

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What is tolerance class? Dealing with NC machining every day, I believe you must have a deep impression on machining accuracy, but how much do you know about “tolerance level”? Tolerance level refers to the level to determine the degree of dimensional accuracy. According to the na ...

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What is non martensitic structure? Non martensitic structure is a common quality defect in surface carburizing (carbonitriding). It can reduce the surface hardness, wear resistance and fatigue properties of carburized layer, which has been perplexing the relevant heat treatment workers. In rec ...

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Before the industrial revolution, forging was the most common metal processing technology. For example, horseshoes, cold weapons, and armor were forged by hand (commonly known as hammering) by blacksmiths from all over the world. He repeatedly heated and hammered the metal to obtain the desired s ...

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