The latest steel pipe knowledge: No. 45 seamless steel pipe knowledge and applications No. 45 steel for high-quality carbon structural steel, hardness is not easy to cut processing, mold is often used to do the template, the tip, the guide column, but must be heat treatment.
1. Before the 45th steel is quenched and not tempered, the hardness is greater than HRC55 (up to HRC62) as qualified.
The highest hardness for practical application is HRC55 (high-frequency hardening HRC58).
2. The 45th steel should not be carburized and quenched.
The quenched and tempered parts have good overall mechanical properties and are widely used in a variety of important structural parts, especially connecting rods, bolts, gears and shafts that work under alternating loads. However, the surface hardness is low and it is not wear resistant. Can be quenched and tempered + surface hardening to improve the surface hardness of parts.
Carburizing treatment is generally used for heavy-duty parts with surface wear resistance and core impact resistance, and its wear resistance is higher than quenched and tempered surface quenching. The surface carbon content of 0.8 - 1.2%, the core is generally 0.1 - 0.25% (0.35% in special circumstances). After heat treatment, the surface can obtain high hardness (HRC58--62), low hardness of the core, and impact resistance.
If the 45 steel is carburized, hard and brittle martensite will appear in the core after quenching, losing the advantage of carburizing. Carburizing technology is now used in the material, the carbon content is not high, to 0.30% of the core strength can be achieved very high, the application is rare. 0.35% has never seen an instance. It is only introduced in textbooks. Can use quenched and tempered + high frequency surface quenching process, wear resistance is slightly worse than carburizing.
GB/T699-1999 standard 45 steel recommended heat treatment system is 850 °C normalizing, 840 °C quenching, 600 °C tempering, to achieve the performance of yield strength ≥355MPa
GB/T699-1999 standard stipulates 45 steel tensile strength is 600MPa, yield strength is 355MPa, elongation is 16%, reduction of area is 40%, impact energy is 39J
Shandong Seamless Steel Tube Factory () is a company that specializes in seamless steel pipe production, processing and sales. The company's main imports of all kinds of domestic steel pipe, stainless steel pipe, carbon steel pipe, sheet metal, pipe fittings and welding materials. The company has a large inventory of products. Tianjin Tiangang, Baotou Baotou Steel, Shanghai Baosteel, Chengdu Panzhihua Iron and Steel, Hubei Metallurgical Steel, Xining Special Steel and other large steel plant excellent agents. And establish a solid business relationship with Shandong Seamless Steel Tube Plant and Dagang Steel Plant. Can be customized for a variety of large-caliber, special thick-walled, special materials of seamless steel pipe and alloy steel pipe.
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