Datong Hydraulic

  GB 40CR alloy Steel is a high quality Quenched and Tempered Alloy Structural steel, It belong to the high quality low carbon,Low alloy chromium, molybdenum, nickel case hardening steel. Oil Quenched & Tempered Hardness is 28-34 HRc. GB 40CR steel Annealing delivery hardenss less than 250HB. 40CR With a lower carbon content range, So GB 40CR alloy steel have good weldability. GB 40CR Alloy steel, we can supply the round bar,  seamless steel tube ,  hard chrome bar . GB 40CR steel Round bar can be sawn to your required lengths as one offs or multiple cut pieces. Chemical composition C(％) 0.37～0.44 Si(％) 0.17～0.37 Mn(％) 0.50～0.80 P(％) ≤0.030 S(％) ≤0.030  Cr(％) 0.80～1.10           Equivalent Of 40Cr alloy Structure Steel USA Germany China Japan France England Italy Poland ISO Austria Sweden Spain ASTM/AISI/UNS/SAE DIN,WNr GB JIS AFNOR BS UNI PN ISO ONORM SS UNE 5140 / G51400 41Cr4 / 1.7035 40Cr SCr440 42C4  530A40 / 530M40     41Cr4   2245                           Heat treatment Rel

  Induction hardening   is a form of heat treatment in which a metal part is heated by induction heating and then quenched. The quenched metal undergoes a martensitic transformation, increasing the hardness and brittleness of the part. Induction hardening is used to selectively harden areas of a part or assembly without affecting the properties of the part as a whole. The hardening depth is 1.5-5mm; medium/low-frequency quenching may lead to excessive depth and negative effect on strength; high-frequency quenching generally result in a shallow depth, and may ensure the balance of hardness and strength. AISI SAE 4140 alloy steel  is a chromium molybdenum alloy steel specification widely used in general purpose high tensile steel for components, like  cylinder rod , shafts, bolts, gears and other applications.  Common 4140 Steel Specifications Country USA German British Japan China Australia Standard ASTM A29 DIN 17200 BS 970 JIS G4105 GB/T 3077 AS 1444 Grades 4140 1.7225/ 42crmo4 42CrMo