What is the hardness of 12l14 material?
The hardness of 12L14 steel is about 121 HB in the hot-rolled state and 163 HB in the cold-rolled condition. This material is mainly used for manufacturing parts that require strict dimensional accuracy and smoothness, but relatively low mechanical performance requirements, such as gears, shafts, bolts, valves, bushings, pins, pipe joints, spring seats, and machine tool screws in instruments, watch parts, automobiles, machine tools, etc. In addition, 12L14 free cutting steel is also used in plastic molding molds and surgical, dental surgical tools and other fields.
There are multiple corresponding standards and equivalent grades of 12L14 steel such as:
·USA: AISI 12L14
·Europe: 11SMnPb30 (1.0722) in EN ISO 683-4: 2018
·Japan: SUM24L in JIS G4804
·Germany: 10SPb20 (1.0722) in DIN EN 10087
12L14 Steel Properties
Density:7.87 g/cm ³ (0.284 lb/in) ³)
On hot rolled condition: Tensile strength 390 MPa (57 ksi);Yield strength 230 MPa (34 ksi);Hardness 121 HB
On cold rolled strength: 540 MPa (78 ksi);Yield strength 410 MPa (60 ksi);Hardness163 HB
12L14 steel contains low carbon, especially low melting point lead particles. It ensures the inherent lubricity of steel during processing and the embrittlement of liquid metal at low processing speeds, thereby avoiding the formation of chip deposits (BUEs). In addition, phosphorus and sulfide inclusions form a source of stress concentration and discontinuity in the ferrite matrix, leading to fragile chips. The sulfide lubrication zone formed during the machining process reduces friction and tool wear, further improving machining performance. All these characteristics combined make this material the easiest to machine material among all common carbon and alloy steels.
