40Cr（）.doc

40Cr（） 40 cr 40Cr is the standard steel number of GB in China, and 40Cr steel is one of the most widely used steel in the machinery industry. It has good comprehensive mechanical properties, good low temperature impact toughness and low notch sensitivity. Good steel hardenability, when water quench hardening to Ф 28 ~ 60 mm, when oil quenching hardening to Ф 15 ~ 40 mm. This type of steel is suitable for cyanide and high frequency quenching. The cutting performance is better, when the hardness is HB174 ~ 229, the relative cutting machinability is 60%. The steel is suitable for making medium plastic mold. Basic information: According to standard GB/T 3077-1999, foreign standards: JIS G4053 ASTM A29 / ISO 683-18:19 96 Two chemicals: C Si Mn Cr Ni P S CU 40 cr 0.37 ~ 0.44 0.17 ~ 0.50 ~ 0.80 ~ 0.80 ~ 0.80 ~ 1.10 is less than 0.030 or 0.035 is less than 0.035 Three mechanical properties: Sample size (mm) : 25 Heat treatment: the first quenching heating temperature (℃) : 850; Coolant: oil The second quenching heating temperature (℃) : Tempering temperature (℃) : 520; Coolant: water and oil 40CR round tensile strength (sigma b/MPa) : greater than or equal to 980 Yield point (sigma/MPa) : greater than or equal to 785 Elongation at break (delta 5/%) : greater than or equal to 9 Area reduction (psi / %) : 45 Impact absorption work (Aku2 / J) : greater than or equal to 47 Brinell hardness (hbs100/3000) (annealing or high temperature tempering) : no more than 207 Four 40 cr is introduced Corresponding steel grade 】 【 reference China GB standard steel grade is 40 cr, German DIN standard material number 1.17035/1.7045, Germany DIN standard steel grade 41 cr4/42 gr4, British EN standard steel grade 18, British BS standard AFNOR standard steel grade 42 c4 steel grade 41 cr4, France, French NF standard steel grade 38 cr4/41 cr4, Italian UNI standard steel grade 41 cr4, Belgium NBN 42 cr4, Sweden SS steel grade standard steel grade, American AISI 2245 / SAE/ASTM standard steel grade