Description
35CrMo is the specification number of alloy structural steel (alloy quenched and tempered steel), which is mainly used to manufacture important parts in various machines bearing impact, bending and torsion and high load. The unified digital code of 35CrMo alloy structural steel (alloy quenched and tempered steel) is a30352, and the executive standard is GB / t3077-2015Chemical composition
Carbon C: 0.32 ~ 0.40 Silicon Si: 0.17 ~ 0.37 Mn: 0.40 ~ 0.70 Sulfur s: allowable residual content ≤ 0.035 Phosphorus P: allowable residual content ≤ 0.035 Cr: 0.80 ~ 1.10 Nickel: allowable residual content ≤ 0.30 Copper Cu: allowable residual content ≤ 0.30 Mo: 0.15 ~ 0.25Mechanical property
Tensile strength σ b (MPa): ≥985(100) Yield strength σ s (MPa): ≥835(85) Elongation δ 5 (%): ≥12 Reduction of area ψ (%): ≥45 Impact energy Akv (J): ≥ 63 Impact toughness value α kv (J/cm²): ≥78(8) Hardness: ≤ 229hb Sample size: sample blank size is 25mm Heat treatment specification and metallographic structure Heat treatment specification: quenching 850 ℃, oil cooling; Tempering 550 ℃, water cooling, oil cooling.35crmo 35CrMo (2 sheets) Italy: 35crmo4 NBN: 34crmo4 Sweden: 2234 Daily standard: scm432 / sccrm3
Mechanical properties
Steel grade: 35CrMo Sample blank size / mm: 25 Heat treatment | quenching | heating temperature / ℃ | first quenching: 850 Heat treatment | quenching | heating temperature / ℃ | second quenching: -- Heat treatment | quenching | coolant: Oil Heat treatment | tempering | heating temperature / ℃: 550 Heat treatment | tempering | coolant: water, oil Mechanical properties | tensile strength σ b/MPa|≥: 980 Mechanical properties | yield point σ s/MPa|≥: 835 Mechanical properties | elongation δ 5(%)|≥: 12 Mechanical properties | surface shrinkage ψ(%)| ≥: 45 Mechanical properties | impact absorption energy Akv / J | ≥: 63 Delivery state hardness HBS | ≥: 229 Delivery status: delivery in heat treatment (normalizing, annealing or high temperature tempering) or non heat treatment status, and the delivery status shall be indicated in the contract.It is used to manufacture important parts in various machines bearing impact, bending and torsion and high load, such as herringbone gear, crankshaft, hammer rod, connecting rod and fasteners of steel rolling mill, main shaft and axle of steam turbine engine, engine transmission parts, large motor shaft, perforator in petroleum machinery, boiler bolts with working temperature lower than 400 ℃, nuts with working temperature lower than 510 ℃, High pressure seamless thick wall conduit (temperature 450 ~ 500 ℃, no corrosive medium) in chemical machinery; It can also replace 40crni for manufacturing high load transmission shaft, steam turbine engine rotor, large section gear, support shaft (diameter less than 500mm), etc; Process equipment materials, pipes, welding materials, etc. Used as important structural parts working under high load, such as transmission parts of vehicles and engines; Rotor, main shaft, heavy load transmission shaft and large section parts of steam turbine generator.