Grades: 45Mn, 50Mn, 40Mn, 35Mn, 30Mn, 20Mn, 16Mn, 15Mn
Standard: GB/T699-1999
Category: medium carbon quenched and tempered steel
Characteristics and scope of 45Mn application
45Mn medium carbon quenched and tempered steel has higher strength, toughness and hardenability than 45 steel. It can obtain better comprehensive mechanical properties after quenching and tempering. The cutting performance is still good, but the welding performance is poor, and the cold deformation plasticity is low. Tempering brittleness tendency, generally used in quenched and tempered state, can also be used in quenched and tempered or normalized state.
45Mn steel chemical compositionCarbon C: 0.42～0.50
Silicon Si: 0.17～0.37
Manganese Mn: 0.70～1.00
Sulfur S: ≤0.035
Phosphorus P: ≤0.035
Chromium Cr: ≤0.25
Nickel Ni: ≤0.25
Copper Cu: ≤0.25
Mechanical properties of 45Mn steel
Tensile strength σb (MPa): ≥620(63)
Yield strength σs (MPa): ≥375(38)
Elongation δ5 (%): ≥15
Reduction of area ψ (%): ≥40
Impact energy Akv (J): ≥39
Impact toughness value αkv (J/cm2): ≥49(5)
Hardness: unheated ≤241HB; annealed steel ≤217HB
This
45Mn steel is generally used in the quenched and tempered state, and the temperature range is -20～425℃. It mainly replaces 40Cr steel to make medium and small cross-section quenched and tempered parts, such as automobile half shafts, steering shafts, worms, spline shafts and machine tool spindles. , Gears, etc. In addition, it can also replace 40Cr steel to make parts with larger cross-sections such as Φ250～320mm hoist intermediate shaft.
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