... 1 5.delivery:20-50 days introduction:Forgings required of each is the same, no porosity, extra spaces ... stretched length, cross section of contraction;Collapsible, length, cross section that can be extended;Change length, cross section.Type of forging: ... free forging/forged, precision forging, hot forging/forging, rolling and forging and die forged.We machining kinds of ...