... 15 years Description:1. Name: Alloy steel construction machinery part 2. Technology: casting 3. Material Grade ... Carbon steel, Alloy steel such as 304, 316, 25#, 45#, 40Cr,ect.R&D capacity:Professional tooling ... milling, broaching, drilling, turning, planning, grinding machinery and three-axle machining centers.Test Equipments:Hardness ... cooperated relationship Alloy steel construction machinery part