The 20CrNiMo series steel is a widely used Cr-Ni-Mo surface-hardening steel, primarily applied in carburizing and carbonitriding processes. With relatively low contents of chromium (Cr), nickel (Ni), and molybdenum (Mo), this steel exhibits excellent forgeability, machinability, and weldability. Components made from this material can undergo direct quenching from carburizing temperatures. Additionally, the tendency to form carbides during the carburizing process is significantly low. As a result, 20CrNiMo steel serves as an ideal substitute for 12CrNi3 in the manufacturing of high-performance carburized and cyanided components. Examples include critical parts such as the teeth inserts and roller bodies of roller cone drill bits used in petroleum drilling and metallurgical mining, as well as gears and gear shafts for the engines and transmission systems of small automobiles and tractors.
After carburization, the surface of this steel achieves outstanding hardness, wear resistance, and contact fatigue strength, while the core retains excellent toughness to withstand high impact loads. Furthermore, it exhibits minimal deformation during processing, along with a narrow and stable hardenability band. These attributes make 20CrNiMo steel one of the most reliable and high-quality gear steels, meeting stringent technical requirements.
This steel is produced using the rectangular bloom continuous casting process in a converter, resulting in multi-specification 20CrNiMo round bars designed specifically for gear applications. Through rigorous testing of various parameters, including macrostructure, non-metallic inclusions, and end-quench hardenability, all properties meet the required technical standards. The steel also demonstrates excellent process performance, earning widespread recognition from both domestic and international customers and peers in the industry.
Exceptional Purity
One of the critical factors in ensuring the safety and durability of gears is the purity of the steel. High-purity steel is essential for achieving enhanced contact fatigue performance, which directly influences the lifespan and reliability of gears. To achieve this, stringent control is exercised to minimize harmful elements such as oxygen (O), nitrogen (N), hydrogen (H), phosphorus (P), and sulfur (S) in the steel. Additionally, the size and level of inclusions are carefully reduced. Trace elements that can adversely affect the material, such as lead (Pb), tin (Sn), arsenic (As), antimony (Sb), and bismuth (Bi), are subjected to strict quality control to prevent their enrichment at grain boundaries. These efforts ensure that 20CrNiMo steel meets the most demanding quality standards, delivering exceptional performance in critical gear applications.
Post time: Jan-03-2025
