Chemical composition
42Cr
This is a chromium-containing alloy steel with a chromium (Cr) content between 0.50% and 0.80%. In addition to chromium, it also contains other basic elements such as carbon, silicon, manganese, etc., but contains no or only trace amounts of molybdenum (Mo) elements.
42CrMo:
Also as a chromium-containing alloy steel, 42CrMo has a slightly higher chromium content than 42Cr, ranging from 0.90% to 1.20%, and explicitly adds molybdenum, whose content is between 0.15% and 0.25%. This makes 42CrMo's main difference from 42Cr in chemical composition is the content of molybdenum.
Physical properties
42Cr: Due to the absence or only trace amount of molybdenum, 42Cr may be slightly inferior to 42CrMo in some aspects. However, it still has the basic characteristics of alloy steel, such as higher strength and toughness.
42CrMo: Due to the addition of molybdenum, 42CrMo excels in wear resistance, corrosion resistance and heat resistance. This steel has high strength, high toughness, good weldability and machinability, and its performance can be further improved after proper heat treatment.
Application Fields
Although 42Cr may be slightly inferior to 42CrMo in physical properties, it is still widely used in occasions that require certain strength and toughness. However, in areas that require higher wear resistance, corrosion resistance or heat resistance, such as heavy machinery, high-load shafts and connectors, 42Cr may not be the preferred material.
Due to its excellent physical properties, 42CrMo is widely used in machinery manufacturing, petrochemicals, aerospace and other fields. Especially in the manufacture of transmission parts such as shafts, gears, bearings, couplings, and structural parts of engineering machinery such as excavators and loaders, 42CrMo is an indispensable material. In addition, it is also often used to manufacture aircraft landing gear, engine parts and other highly demanding aerospace parts.
