Specification 1. Chromium molybdenum alloy steel . 2. Slightly higher carbon content than 4130. 3. Greater strength and heat treatment . Application 1. Applications in the oil and gas sector. 2. Connection rods, collets, conveyor pins. 3. Gears, stem assemblies. 4. Pump shafts and tool holders. Shape:steel plate/flat bar/round bar Technology:Hot work / Forged/cold drawn Heat treatment:Annealed / Q+T Surface condition:Black/Peeling/Polishing/Machined Delivery condition:Hot rolled or forged, Peeled or black surface Test:UT 100% / SGS Certification:ISO/mill certificate