Chinese standard YB/T5047-1993 is national steel standard for the application of steel used in the manufacture of tools for use in mining. It is updated on an annual basis and is closely monitored by the Ministry of Industry and Information Technology to ensure the safety and reliability of products.
YB/T5047-1993 outlines the grades and presentation of carbon steel and alloy steel, as well as the application requirements of steel. The grade of steel is specified according to the nature and the function which it performs in the working environment. The grades may range between 0.20 and 0.90, and it may be identified through its chemical composition and the appearance of the image.
The quality of the steel used in constructing tools is mainly determined by the classification of steel and its specific requirements, quality level of raw materials, weld quality, process conditions, assembly technology and other factors. The carbon content of the steel that may be used for mining tools is generally between 0.20 to 0.80%. Generally, the carbon content of the low alloy steel used for mining tools is higher than the carbon content of ordinary carbon steel.
YB/T5047-1993 also attempts to control the mechanical properties of the steel used in mining tools, such as the tensile strength, yield strength, elongation and toughness. The yield strength should generally be higher than 700MPa and the elongation should be no less than 10%. The maximum hardness of steel should be no more than 240HBS, while the hardness of thick-walled materials should not exceed 250HBS.
The standard also regulates the performance of non-metallic material used in mining equipment and safety accessories. These materials include polyurethane and high-density polyethylene. These materials are mainly used for anti-vibration and anti-shock performance, corrosion resistance, flame retardancy and temperature resistance.
For non-metallic materials, there are five categories by function，namely, anti-vibration, cushioning, sealing, insulating and controlling of objects. Anti-vibration and cushioning materials mainly include polyurethane, polyolefin, silicone, epichlorohydrin, polystyrene and polypropylene. Sealing materials mainly include polyether, polytetrafluoroethylene, cellulose acetate, polysulfone, and polyimide. The insulating material mainly includes polyethylene, polyisoprene and polyamide, and the controlling object material mainly include polyethylene and polypropylene.
In addition, YB/T5047-1993 also outlines the usage and safety requirements of the non-metallic material used in mining tools, such as chemical resistance, fire resistance, humidity, temperature and vibration. It should also be noted that these materials are closely linked to the performance and reliability of the mining tools.
YB/T5047-1993 is the national steel standard for the application of steel used in the manufacture of tools for use in mining. It covers the grades and presentation of carbon steel and alloy steel, as well as the application requirements of steel, non-metallic materials, and the usage and safety requirements of non-metallic materials used in mining tools. It is an important reference for the manufacture and use of mining tools.
