Stainless Steel 40mn

stainless steel 40mn

40Mn, delivered in a state of no heat treatment or heat treatment (annealed, normalized or high temperature tempering). Where delivery in heat treatment condition is required, it shall be indicated in the contract, and if not indicated, delivery shall be made without heat treatment.

Chinese name 40Mn

Chemical composition Carbon C: 0.37 ~ 0.44

Standard GB/T 699-1988

Sample size The sample size is 25mm

Basic information
Material name: Brand: 40Mn

Chemical composition

Carbon C: 0.37~0.44

Silicon Si: 0.17 ~ 0.37

Manganese Mn: 0.70 ~ 1.00

Sulfur S: ≤0.035 (Group: High quality steel)

P: ≤0.035 (Group: high quality steel)

Chromium Cr: ≤0.25

Nickel Ni: ≤0.30

Copper Cu: ≤0.25

Mechanical property

Tensile strength σb (MPa) : ≥590(60)

Yield strength σs (MPa) : ≥355(36)

Elongation δ5 (%) : ≥17

Section shrinkage (%) : ≥45

Impact power Akv (J) : ≥47

Impact toughness value αkv (J/cm2) : ≥59(6)

Hardness: no heat treatment ≤229HB; Annealed steel ≤207HB

Sample size: 25mm

Processing specification
Normalizing,860℃; Quenching,840℃; Temper,600℃.

Distinction

ingredient

The three materials of 35Mn, 40Mn and 45Mn belong to high-quality carbon structural steel, the main difference is that the carbon content is different, and the other components are the same. The difference in carbon content is directly related to the properties of the material.

35Mn Feature Usage

35Mn has good ductility during cold deformation, but poor weldability. It should be used after tempering treatment. Suitable for rotating shafts. Bolts. Nuts, screws, etc., mandrel. Gears are also used in the manufacture of bolts, nuts, levers, etc., in medium-sized machinery.

40Mn Feature Function

40Mn carbon structural steel can be used in the normalizing state, and can also be used in the quenching and tempering state. The cutting performance is good, the plasticity during cold deformation is medium, and the welding performance is poor. It is used to manufacture parts that bear fatigue loads, such as shaft rollers and screws and nuts that work under high stress.

Hardenability slightly higher than 40 steel. Strength after heat treatment. Hardness. Toughness is slightly higher than 40 steel, medium cold deformation plasticity, good machinability, low weldability, overheating sensitivity and tempering brittleness, water quenching and easy cracking. Suitable for fatigue resistant parts, crankshaft, roller, shaft, connecting rod.

40Mn Feature Usage

After quenching and tempering treatment, 45Mn carbon structural steel can obtain better comprehensive mechanical properties, cutting performance is good, but poor welding performance, low cold deformation plasticity, temper brittleness tendency, generally used in the quenching state, and can also be used in quenching and tempering or normalizing state. Used to manufacture worn parts, such as rotating shafts, mandrels, crankshafts, spline shafts, connecting rods, universal joint shafts, engaging rods, gears, clutch discs, bolts, nuts, etc

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