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The standards used in my country's metallurgical products are national standards (code-named 'GB'), Ministry standards (Ministry of Metallurgical Industry Standards 'YB', First Machinery Ministry Standards 'JB', etc.), the gross weight, net weight and tare weight should be indicated on the package. (1) Packaging inspection shall be determined according to the type, shape, size, precision and corrosion protection of metal materials.

Normal length (indefinite length): The length is not specified, but it must be within a specified length (depending on the variety, the length is different, according to the department and factory). The staff engaged in metal materials must master the relevant content of the standard. (4) Inspection of quantity The quantity of metal materials generally refers to the weight (except for a few cases of backing plates and fishplates, which are counted in pieces). Shaft: refers to wire, steel wire rope, steel strand, etc. 18. of the material. 4.

The quantity inspection methods are as follows: 17. Nominal size (nominal size): It is the ideal size that people want in production, but there is a certain gap between it and the actual size. Printing: robot bearing suppliers The method of stamping or spraying paint on the specified parts of the metal material (end face, end), indicating the brand, specification, standard number, etc. Short ruler (narrow ruler): The length is less than the lower limit of the prescribed general length dimension, but not less than the prescribed minimum allowable length. 11. Size deviation

: The difference between actual size and nominal size is called size deviation. For some metal materials, part of the 'short ruler' can be handed in as required. Box (barrel): Refers to anti-corrosion, small and thin products, such as tinplate, silicon steel sheet, magnesium ingot, etc. In the inspection of specifications and dimensions, attention should be paid to the measurement of material parts and the selection of appropriate measuring tools. Mainly used for medium and heavy plates, profiles, non-ferrous materials, etc

The application, as well as the Ball Bearings For Cleaner Motor development of the chemical industry, demand more and more stainless steel, while nickel deposits are small and concentrated in a few areas. Therefore, there is a contradiction between nickel supply and demand in the world. Therefore, in the areas of stainless steel and many other alloys (such as steel for large castings and forgings, tool steel, heat-strength steel, etc.), especially in countries where nickel resources are relatively scarce, the science of saving nickel and replacing nickel with other elements has been extensively carried out.

In research and production practice, there are more researches and applications in this area that replace nickel in stainless steel and heat-resistant steel with manganese and nitrogen. The effect of manganese on austenite is similar to that of nickel. But to be more precise, the role of manganese is not to form austenite, but to reduce the critical quenching rate of steel, increase the stability of austenite during cooling, inhibit the decomposition of austenite, and make it form at high temperatures.

Stainless steel is defined as a high-alloy steel that can resist corrosion in the air or in chemical corrosive media. Stainless steel has a beautiful surface and good corrosion resistance. It does not need to undergo surface treatment such as plating, but uses the inherent surface properties of stainless steel.

A kind of steel in many aspects, usually called stainless steel. High-alloy steels such as 13 chrome steel and 18-chrome nickel steel are representative of performance. From the perspective of metallography, because stainless steel contains chromium, a very thin chromium film is formed on the surface. This film isolates the oxygen from the intrusion of the steel and acts as a corrosion resistance. In order to maintain the inherent corrosion resistance of stainless steel, steel must contain more than 12% chromium. Types of stainless steel: Stainless steel can be roughly classified according to its use, chemical composition and metallographic structure. The austenitic steel is basically composed of 18% chromium-8% nickel, and the amount of addition of each element varies, and steel types for various purposes are developed.