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HY4700 Micro Alloy Steel Grades Chrome Rod For Hydraulic Cylinder Product Description 1. The micro alloy steel products are developed on the basis of the proprietary technology of the control rolling and cooling for substituting quenched and tempered 42CrMo4, 40Cr and CK45 with a variety of mechanical performance requirements. 2. It is mainly used in mechanical manufacturing for the directly turning part of shaft and rod, etc 3. the mechanical property is correspond to