... purlin roll forming machineOther machine we manufactureCold roll forming mahcine, color steel roll forming machine,roof and wall panel machine,decking floor roll forming machine,floor decing forming mahcine, stud and track roll forming machine, highway guardrail roll forming machine ... GCr15 steel(5)Hardness for Heat Treatment: HRC55 – 60°C 3. HYDRAULIC PUNCH DEVICE: (1)Adopted with 4 pillars ...