40mn Introduction Material Name: High quality carbon structural steel grades: 40Mn Standard: GB / T 699-1988 ● Features and Scope: 40Mn carbon steel in the normalized state, can also be quenched and tempered condition the use of . Cutting performance, cold plastic deformation of the medium, poor welding performance. Under fatigue loads used in the manufacture of parts, such as the roller shaft and work under high stress screws, nuts and so on. Hardenability slightly higher than the 40 steel. After heat treatment, strength, hardness. Tenacity higher than 40 steel, cold plastic deformation of medium can be good cutting, welding low, with a thermal sensitivity and temper brittleness, water quenching easy to crack. Fatigue-resistant parts for crank. Rollers. Axis. Rod. [1] 

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 Chemical composition 
 ● Chemical Composition: C: 0.37 ~ 0.45 Si Si: 0.17 ~ 0.37 Manganese Mn: 0.70 ~ 1.00 S S: ≤ 0.035 P P: ≤ 0.035 

 Chromium Cr: ≤ 0.25 Ni-Ni: ≤ 0.30 Cu Cu: ≤ 0.25 

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 Mechanical Properties 
 ● Mechanical Properties: Tensile σb (MPa): ≥ 590 (60) yield strength σs (MPa): ≥ 355 (36) Elongation δ5 (%): ≥ 17 Reduction of area ψ (%): ≥ 45 impacts Power Akv (J): ≥ 47 impact toughness αkv (J/cm2): ≥ 59 (6) Hardness: No heat treatment ≤ 229HB; annealed steel ≤ 207HB sample size: Sample size is 25mm ● microstructure and heat treatment specifications : Heat treatment specifications: normalizing, 860 ℃; quenching, 840 ℃; tempering, 600 ℃. ● Delivery status: no heat treatment or heat treatment (annealing, normalizing or tempering) the status of delivery. Requires heat treatment delivery should be specified in the contract, no heat treatment not indicated by the name of the delivery 40mn presentation materials: high quality carbon structural steel 

 Grade: 40Mn 

 Standard: GB / T 699-1988 

 ● Features and Scope: 

 40Mn carbon steel in the normalized state, can also be quenched and tempered condition in use. Cutting performance, cold plastic deformation of the medium, poor welding performance. Under fatigue loads used in the manufacture of parts, such as the roller shaft and work under high stress screws, nuts and so on. 

 Hardenability slightly higher than the 40 steel. After heat treatment, strength, hardness. Tenacity higher than 40 steel, cold plastic deformation of medium can be good cutting, welding low, with a thermal sensitivity and temper brittleness, water quenching easy to crack. Fatigue-resistant parts for crank. Rollers. Axis. Rod. 

 Chemical composition 
 ● Chemical Composition: 

 Carbon C: 0.37 ~ 0.45 

 Si Si: 0.17 ~ 0.37 

 Manganese Mn: 0.70 ~ 1.00 

 S S: ≤ 0.035 

 Phosphorus P: ≤ 0.035 

 Chromium Cr: ≤ 0.25 

 Ni-Ni: ≤ 0.30 

 Copper Cu: ≤ 0.25 

 Mechanical Properties 
 ● Mechanical Properties: 

 Tensile strength σb (MPa): ≥ 590 (60) 

 Yield strength σs (MPa): ≥ 355 (36) 

 Elongation δ5 (%): ≥ 17 

 Reduction of area ψ (%): ≥ 45 

 Impact energy Akv (J): ≥ 47 

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

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

 Sample size: Sample size is 25mm 

 ● Heat treatment and microstructure specifications: 

 Heat treatment specifications: normalizing, 860 ℃; quenching, 840 ℃; tempering, 600 ℃. 

 ● Delivery status: no heat treatment or heat treatment (annealing, normalizing or tempering) the status of delivery. Requires heat treatment delivery should be specified in the contract, not indicated by no heat treatment delivery