40Cr steel 40Cr quenched and tempered steel machinability large plate 1000 * 2000

GB is the standard 40Cr steel, 40Cr steel mechanical manufacturing one of the most widely used steel. After quenching with good mechanical properties, good low temperature impact toughness and low notch sensitivity. Steel hardenability good, when water quenching can hardenability to Ф28 ~ 60mm, when oil quenching can hardenability to Ф15 ~ 40mm. In addition to refining treatment outside of the steel is also suitable cyanide and induction hardened. Cutting better, when the hardness of HB174 ~ 229, the relative machinability of 60%. The steel is suitable for the production of medium-sized plastic mold. Chemical composition of C: 0.37 ~ 0.44 Si: 0.17 ~ 0.37 Mn: 0.50 ~ 0.80 Cr: 0.80 ~ 1.10 Ni: ≤0.030 P: ≤0.035 S: ≤0.035 Cu: ≤0.030 mechanical properties of the sample blank dimensions (mm): 25 Heat Treatment : The first quenching temperature (℃): 850; coolant: Oil second quenching temperature (℃): - tempering heating temperature (℃): 520; coolant: water, oil tensile strength (σb / MPa): ≥980 yield point (σs / MPa): ≥785 percentage elongation (δ5 /%): ≥9 section shrinkage (ψ /%): ≥45 impact energy (Aku2 / J): ≥47 cloth Hardness (HBS100 / 3000) (annealing or tempering state): ≤207 feature uses modulation characteristics of carbon steel, cold heading die steel. The steel affordable, easy processing, the availability of appropriate heat treatment after a certain toughness, ductility and wear resistance. Normalizing can promote tissue ball, improved cutting hardness of less than 160HBS blank. Tempered at a temperature of 550 ~ 570 ℃, the steel has the best mechanical properties. The steel hardenability than 45 steel, suitable for high-frequency hardening, flame hardening and other surface hardening treatment. Use of such steel after quenching and tempering for manufacturing under medium load and medium speeds of mechanical parts, such as automotive knuckles, and rear axle gears, shafts, worm, spline shaft, sets and other tools on top; by After quenching and tempering for the manufacture of high loads, impact and moderate speeds of parts such as gears, shaft, pump rotor, sliders, rings, etc; after quenching and tempering for the manufacture of heavy duty, low impact and abrasion resistant, the cross-sectional thickness of 25mm or less part of the entity, such as a worm, spindles, shafts, rings, etc; quenched and later used in the manufacture of high-frequency surface hardening has a high surface hardness and wear resistance no significant impact of parts such as gears, sleeves, shafts, shaft, crankshaft, spindles, pins, connecting rods, screws, nuts, intake valves and the like. In addition, this steel and suitable for the manufacture carbonitriding process performed various transmission parts, such as large diameter and low temperature toughness, good gear and shaft. Delivery status and annealed hardness, hardness ≤207HBS.