Content :
Drill collar / oilfield drilling tool / drill tool /
Material 1: 4145H MOD
Material 2: Non-magnetic
Size: 3 1/8"-14"
Melting : EAF + LF + VD
Forging : open die forging/rolling
Other process: Q+T, + drilling + machining + milling + threading
Delivery Time: 35-60 days