4140 steel is chromium, molybdenum, manganese steel with good toughness, impact resistance and fatigue strength. 1045 has slightly increased tensile strength and yield strength numbers than 1045 as a result of a slightly higher carbon content. Also, as a result of higher carbon content, 1045 is not as easy to weld as 4140.
The carbon content of AISI 1045 is nominally 0.45% carbon. That is only slightly higher than the nominal carbon content of the 4140 which has a nominal value of 0.40% carbon. However, what is not being considered is the sum of the effects of the other alloying constituents; chrome and molybdenum in the 4140 alloy.
AISI 4140 is a chromium-molybdenum alloy steel. The chromium content provides good hardness penetration, and the molybdenum content ensures uniform hardness and high strength. AISI 4140 chrome-molybdenum steel can be oil hardened to a relatively high level of hardness.
Both 4130 and 4140 have carbon, chromium (0.80 to 1.15 percent) and molybdenum (0.15 to 0.25 percent) as primary alloying elements. They differ slightly in their carbon content 4130 has a nominal 0.3 percent carbon, while 4140 has a nominal 0.4 percent.
The carbon content of 4140 steel is 0.40 percent, making it a medium carbon steel. Choose your electrode. The electrodes in TIG can be pure tungsten for softer steels, but they may require alloying agents for harder steels. Grade 4140 steel is relatively hard and typically uses tungsten electrodes with 2 percent cerium oxide.
SAE 4140 and 4150 steels are standard alloy steels. The major criteria used for comparing alloy steels are chemical composition and tensile strength. The Society of Automotive Engineers, or SAE, and the American Iron and Steel Institute,or AISI, use a four-digit system to designate the chemical composition of steel.
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