Stainless Steel 45mn
Stainless Steel 45mn
Stainless Steel 45mn
Stainless Steel 45mn
Stainless Steel 45mn

Stainless Steel 45mn

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Product Introduction

45Mn This is a replacement of 40Cr steel more successful new steel, it has higher strength, hardness, wear resistance and good toughness, its hardenability is slightly higher than 40Cr, in the oil critical quenching diameter of 18 ~ 33mm; After normalizing, the machinability is good, and the process performance of cold drawing, rolling, tapping, forging and heat treatment is also good. The grain growth, oxidation, decarburization and quenching deformation tendency are small at high temperature. However, there is temper brittleness, tempering stability is slightly worse than 40Cr steel.

Text name 45Mn steel

Other name 40Cr steel

45Mn for short

Class type new steel grade

Material characteristics

High quality carbon structural steel, grade 45Mn, characteristics and scope of application:

45Mn carbon tempered steel, strength, toughness and hardenability are higher than 45 steel, tempered treatment 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 tempered state, 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.

Chemical composition

The main component is Fe (iron) and contains small amounts of the following elements:

Carbon C: 0.42 ~ 0.50%

Silicon Si: 0.17 ~ 0.37%

Mn: 0.70 ~ 1.00%

Sulfur S: ≤0.035%

P: ≤0.035%

Chromium Cr: ≤0.25%

Nickel Ni: ≤0.25%

Copper: ≤0.25%

Mechanical property

Tensile strength σb (MPa) : ≥620(63)

Yield strength σs (MPa) : ≥375(38)

Elongation δ5 (%) : ≥15

Section shrinkage ratio ψ (%) : ≥40

Impact power Akv (J) : ≥39

Impact toughness value αkv (J/cm2) : ≥49(5) Hardness: no heat treatment ≤241HB; Annealed steel ≤217HB

Heat treatment process: 850℃ normalizing, 840℃ quenching, 600℃ tempering.

Main characteristics

This steel is generally used in the state of tempering, the use of temperature range of -20 ~ 425℃, mainly to replace 40Cr steel production of medium and small cross-section of tempering parts, such as automotive shaft, steering shaft, worm, spline shaft and machine tool spindle, gear and so on. In addition, it can also replace 40Cr steel to make parts with larger sections such as Φ250 ~ 320mm winch intermediate shaft. This steel can also be used in place of 40CrNi steel when making smaller parts.

Service steel strip

Product name material specification

Carbon steel 2.5*1250

Excellent carbon steel 3.0*1250

Excellent carbon steel 3.5*1250

Excellent carbon steel 4.0*1250

Excellent carbon steel 4.5*1250

Excellent carbon steel 5.0*1250

Excellent carbon steel 5.5*1250

Excellent carbon steel 6.0*1250

Excellent carbon steel 6.5*1250

Excellent carbon steel 7.0*1250

Excellent carbon steel 7.5*1250

Excellent carbon steel 8.0*1250

Excellent carbon steel 8.5*1250

Excellent carbon steel 9.0*1250

Excellent carbon steel 10.0*1250

Carbon steel 11.0*1250

Carbon steel 12.0*1250

Service circle

Carbon steel 75*6000

Carbon steel 160*6000

Performance difference

40Cr- high-quality alloy structural steel, commonly used to do tempering treatment of high-performance mechanical parts, is a tempering steel.

45Mn - high quality carbon steel with high manganese content, commonly known as manganese steel, has good mechanical properties, and is generally directly used as mechanical parts.

45 - high-quality carbon structural steel, can be heat treated, tempered, quenched, can also be directly processed. More commonly used.

Corresponding brand

Us standard: 1035

Day mark: S45C

British standard: 080A52

Standard: XC35

Former Soviet Union: 50Γ