55# hot rolled round bars and forged round bars

55# hot rolled and forged round bars are fine carbon structural steel under the standard of GB/T 699-1999
After treating,55# hot rolled and forged round bars, with high surface hardness and strength, but low plasticity and toughness, machinability of medium, poor weldability, harden ability, water quench a tendency to form crack.In commonly ,55# hot rolled and forged round bars are used for some parts with the demand that higher strength and wear resistance or some parts with small flexibility, dynamic load , such as gear, wheel rim, flat springs, crankshaft, etc.
The delivery condition 55# round bar are:hot rolled or forged +Normalizing+Tempering+Quenching and tempering+Normalizing and tempering+Annealing .
The size for 55# round bar 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
UT standard 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 55# hot rolled and forged round bar shown in the following table:
55# hot rolled and forged round bar chemical composition analysis -% by mass

55# hot rolled and forged round bar Mechanical properties .

KUNFENG is the professional supplier in China .If you need 55# round bars , we can put the 55# round bars order to our steel mill directly or collect these goods from our stock directly if we have enough ex-stock on stock . if you need any offer or if you want to know the price and any other information about ,please be free to contact us.