4145 Steel vs 4140 Steel: Performance Differences and Selection Guide for Chromium-Molybdenum Alloy Steel
4145 steel and 4140 steel are both medium carbon chromium-molybdenum alloy steels (ASTM A29 standard). Due to the subtle differences in composition and performance, they often face selection disputes in the fields of petroleum, aerospace, heavy machinery, etc. This article systematically analyzes the differences between the two through chemical composition comparison, mechanical property testing, [...]