1215 Fast cutting steel is considered the standard screw stock. Cutting speeds and machining characteristics are excellent. 1215 is a resulphurized and rephosphorized free machining steel, commonly referred to as screw machine stock. 1215 is an improved free machining steel that has replaced the Bessemer B1113 grade years ago. 1215 is especially suited for automatic screw machine operations where the major requirement is exceptional free-machining quality with a smooth, bright finish.

AISI 1215 is a Standard Resulfurized And Rephosphorized grade Carbon Steel. It is composed of (in weight percentage) 0.09%(max) Carbon (C), 0.75-1.05% Manganese (Mn), 0.04-0.09% Phosphorus (P), 0.26-0.35% Sulfur (S), and the base metal Iron (Fe). Other designations of AISI 1215 carbon steel include UNS G12150 and AISI 1215.

1215 was developed for manufacturing numerous parts requiring considerable machining, close finish tolerances, and a bright smooth finish, ideal for screw machine stock. Can also be used for bushings, inserts, hydraulic hose fittings, couplings, studs, pins, etc. Beyond ordinary machining, it will respond well to roll threading, nibbing, and some minor bending without cracking. It is not recommended for forming, ordinary bending, or upsetting, nor for parts subject to severe fatigue stress.

Machineability and Weldability

Machinability is rated at 136% of B1112. Average cutting speed 225 ft/min. Because of 1215™s very high sulphur content, weldability is considered poor.

Heat Treating

Although this analysis will respond to conventional treatments, 1215 is not considered to be a case hardening steel. Better results are obtained from 1117 or 1018.