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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.

Chemical Composition
Carbon (C) Max Manganese (Mn) Phosphorus (P) Sulfur (S)
0.09 0.75-1.05 0.04-0.09 0.26-0.35

1215 cold roll conforms to ASTM A29, A108

Mechanical Properties
Condition Tensile Strength (PSI) Yield Strength (PSI) Reduction of Area Elongation in 2" Brinell Hardness
1" Rd, cold drawn 87,000 75,000 42 15 187

Related Metals: Xtrocut 250(tm)                                     
Specifications: AMS 5010, ASTM A108, ASTM A29, ASTM A576, SAE J403, SAE J412, UNS G12150
Chemistry Data
Carbon 0.09 max
Manganese 0.75 - 1.05
Phosphorus 0.04 - 0.09
Sulphur 0.26 - 0.35
General Information
Physical Data
Density (lb / cu. in.) 0.283
Mechanical Data
Form Round Bar
Condition Cold Drawn
Temper 68
Tensile Strength 78
Yield Strength 60
Elongation 10
Reduction of Area 35
Rockwell B86
Brinnell 163


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