Comprehensive Analysis of DIN 1630 ST37.4, ST44.4, and ST52.4 Hydraulic Cylinder Precision Steel Pipes Introduction to DIN 1630 Precision Steel Tubes Hydraulic systems are the backbone of numerous industries, from automotive to heavy machinery, where reliability under high pressure is non-negotiable. DIN 1630 addresses this need by specifying seamless, non-alloy precision steel tubes engineered for