Good translation of the Metal Products (Shanghai) carburizing steel (domestic case-hardened steel / import carburizing steel) 20CrMnTi carburizing steel / steel plate 20CrMnTi / 20CrMnTi steel bars / 20CrMnTi Coil / 20CrMnTi strip / 20CrMnTi steel pipe / 20CrMnTi wire (good Translated Metal Products (Shanghai) Co., Ltd.) 
 20crmnti introduced 
 20CrMnTi case-hardened steel case-hardened steel is usually the carbon content of 0.17% -0.24% of the low carbon steel. Car with its manufacturing transmission gears. In hardenability 
 Carburizing steel of Cr Mn Ti steel, hardenability high hardenability, high strength and toughness, especially with high low temperature impact toughness .20 CrMnTi case hardened processing of steel. good workability, machining deformation tiny, anti-fatigue performance is very good. Uses: Used for gears, shafts, piston class spare parts for the automotive, aircraft, a variety of special parts parts. 
 Grade: 20CrMnTi 
 Standard: GB / T 3077-1999 
 ● Features and Scope: 
 Good performance of case-hardened steel, high hardenability, after carburizing hard and wear-resistant surface and tough core part has a high low temperature impact toughness, weldability, medium, normalizing and machinability is good. For the manufacture of cross-section <30mm withstand high-speed, medium or heavy load, impact and friction parts such as gears, ring gear, gear shaft cross head. 
 18CrMnTi the generation of steel, widely used as a carburizing parts, automobile and tractor industries for cross-section less than 30mm, to withstand high-speed or heavy-duty, as well as by the impact. Friction carburizing parts such as gears. Axis. Ring gear gear shaft slide bearing spindle. crosshead. claw clutch. worm and so on. 
 Chemical composition 
 ● Chemical Composition 
 Carbon C: 0.17 ~ 0.23 
 Silicon Si: 0.17 ~ 0.37 
 Mn Mn: 0.80 ~ 1.10 
 Sulfur S: Allow the residual content of ≤ 0.035 
 Phosphorus P: Allow the residual content of ≤ 0.035 
 Chromium Cr: 1.00 ~ 1.30 
 Ni: to allow the residual content of ≤ 0.030 
 Cu: to allow the residual content of ≤ 0.030 
 Ti Ti: 0.04 to 0.10 
 Mechanical properties 
 ● Mechanical Properties: 
 Tensile strength σb (MPa): ≥ 1080 (110) 
 Yield strength σs (MPa): ≥ 835 (85) 
 The elongation δ5 (%): ≥ 10 
 Reduction of area ψ (%): ≥ 45 
 Impact energy Akv (J): ≥ 55 
 Impact the toughness the value αkv (J/cm2): ≥ 69 (7) 
 Hardness: ≤ 217HB 
 Sample size: sample blank size is 15mm 
 Heat treatment specification 
 ● Heat treatment and microstructure: 
 The specification of the heat treatment: quenching: the first 880 ℃, the second 870 ℃, oil cooling; tempering 200 ° C, water-cooled, air-cooled. 
 Details of the heat treatment specifications and mechanical properties: 
 Sample rough size / mm: 15 
 Heat treatment heating temperature / ° C | | hardening | first quenching: 880 
 Heat treatment | quenching heating temperature / ° C quenching: 870 
 Heat Treatment | hardening | Coolant: Oil 
 Heat treatment tempering | heating temperature / ° C: 200 
 Heat Treatment | Tempering | coolant: water, air 
 Mechanical properties of tensile strength σb / MPa | ≥: 1080 
 Mechanical properties of the yield point σs / MPa | ≥: 850 
 Mechanical Properties | the elongation δ5 (%) | ≥: 10 
 Mechanical properties of | surface shrinkage ψ (%) | ≥: 45 
 Mechanical properties of absorbed energy AKV / J | ≥: 55 
 Delivery status hardness HBS was | ≥: 217 
 ● 20CrMnTi density and modulus of elasticity: 
 Density: 7.8 × 103kg/m3 elastic modulus: 207GPa Poisson's ratio: 0.25 Thermal conductivity: 1.26 × 10-51 / ℃ 
 ● 20CrMnTi normalizing 
 20CrMnTi normalizing 20CrMnTi steel insulation in heated 860 ° C rapid cooling to 680 ℃ insulation air-cooled temperature normalizing process with a cold fog of heated 960 ° C insulation, high temperature normalizing process, the two processes compared to the difference and effect. 
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