40Cr hot rolled round bars and forged round bars

40 Cr hot rolled round bars and forged round bars are the steel of the standard of GB/T 3077-1999 in China, 40 Cr steel is one of the most widely used steel machinery manufacturing field.

After tempering treatment,the 40 Cr hot rolled round bars and forged round bars has good comprehensive mechanical properties,good low temperature impact toughness and low notch sensitivity.its harden ability is good , when water quench hardening can reach to Ф 28 ~ 60 mm, when oil quenching hardening can reach to Ф 15 ~ 40 mm.In addition ,after the tempering treatment ,it also fits for cyanide and high frequency quenching process. when hardness is HB174 ~ 229, its cutting performance is good,the relative cutting machining is 60%.The steel is suitable for medium-sized plastic mold.
The delivery condition 40Cr round bar are:hot rolled or forged + Normalizing+Tempering+Quenching and tempering+Normalizing and tempering+Annealing .
The sizes for 40Cr round bars which available for our KUNFENG steel are Ф 5-80 for hot rolled round bar and Ф 80-1200 for forged round bar ,the length range is from 3000 to 12000mm.
The tolerance of the diameter is -0/+3mm ,The tolerance of the length is -0/+20mm.and the straightness tolerance is ≤3mm/m
surface delivery status: black/polishing/turning
The UT standard what we can do are Chinese standard of GB/T 6402 I,II,III and export standard SEP1921 CLASS C/C，D/D，E/E.
The more information of 40Cr hot rolled and forged round bar shown in the following table:

40Cr hot rolled and forged round barChemical composition

40Cr hot rolled and forged round bar Mechanical properties

We, KUNFENG will use our professional services , best quality and competitive price to fulfill each customers needs in 40Cr hot rolled round bars and forged round bars .More information about ,please feel free to contact us, we will always do our best to help you.