What is the difference between 4140 and 4145 steel?
The 4145 type of steel comes from the same family( Chromium-Molybdenum Series) of the 4140 steel. The very small difference is their percentage of carbon content.4145 has carbon content with 0.43-0.48%,0.05% higher than 4140 Steel.Due to the slight difference in carbon content, the strength of 4145 steel is slightly higher than that of 4140 [...]