Special Steels - Gerdau

Steels for cold deformation
These steels do not differ in chemical
composition with carbon and alloy steels
but require certain specific conditions.
Microalloyed steels
The mechanical properties of the pieces
or bars are achieved by the combined
effect of different mechanisms without
the need for heat treatment.
Heat resistant steels
Steels whose main characteristics are
the resistance to plasticity under strong
pressures, in hot conditions.
8
Application:
• Different ranges of alloying (C, Mn, Cr-Mo, CrNiMo, B) with different levels of strength from
450 to 1300 MPa. Studs, bolts and parts for cold heading.
Standard equivalents Chemical composition (average values in %)
GERDAU EUROPE GERMANY FRANCE C Mn Si Cr Ni Mo B
EN DIN Stand AFNOR
DF8 XC6FF 0,08 0,35 0,03
DF35 C35KD Cq35 1.1172 XC32 0,35 0,65 0,20
DF45 C45KD Cq45 1.1192 XC42H1 0,45 0,65 0,20
DF20B C22BKD 22B2 1.5508 21B3 0,20 0,80 0,10 0,003
DF34Cr4 34Cr4KD 34Cr4 1.7033 32C4 0,34 0,75 0,15 1,05
DF25CrMo4 25CrMo4KD 25CrMo4 1.7218 25CD4 0,25 0,75 0,15 1,05 0,20
DF34CrMo4 34CrMo4KD 34CrMo4 1.7220 34CD4 0,34 0,75 0,15 1,05 0,20
DF34CrNiMo6 34CrNiMo6KD 34CrNiMo6 1.6582 0,34 0,55 0,20 1,55 1,55 0,20
Application:
• All kind of parts but generally, crankshafts, conrods, pistons, parts for suspension
systems, wheel rims, constant velocity joints. The tensile strengths achieved on the
parts are between 650 and 1150 N/mm2 depending on the type of steel used.
Standard equivalents Chemical composition (average values in %)
GERDAU EUROPE GERMANY FRANCE C Mn Si S Al V Ti
EN DIN Stand AFNOR
MICRO800 30MnVS6 27MnSiVS6 1.5232 0,28 1,45 0,60 0,04 0,03 0,10 0,01
MICRO850 46MnVS6 49MnVS3 1.1199 0,47 0,80 0,40 0,06 0,03 0,10 0,01
MICRO900 38MnVS6 38MnSiVS5 1.5231 0,38 1,35 0,60 0,06 0,03 0,10 0,01
MICRO1000 46MnVS6 44MnSiVS6 1.5233 0,43 1,45 0,60 0,03 0,03 0,10 0,01
Application:
• Mo and CrMo steels:
These steels are used for parts in contact with vapour, valves, flanges,high pressure
cylinders, boilers, axle shafts and turbine rotors,vapour collectors, installations for
cracking in the oil and gas industries. Can be used at temperatures of 500 °C.
Standard equivalents Chemical composition (average values in %)
GERDAU EUROPE GERMANY FRANCE C Mn Si Cr Mo V
EN DIN Stand AFNOR
16Mo3 15Mo3 1.5415 0,16 0,55 0,25 0,30
16Mo5 16Mo5 1.5423 0,16 0,55 0,25 0,55
15MoCr5 15CD2.05 0,15 0,55 0,25 0,65 0,55
14MoCr5 13CrMo4-5 13CrMo4.4 1.7335 15CD4.05 0,14 0,55 0,25 1,00 0,55
12CrMo9 10CrMo9-10 10CrMo9.10 1.7380 12CD9.10 0,12 0,55 0,25 2,25 1,00
10CrMo20 12CrMo19.5 1.7362 Z15CD5.05 0,10 0,45 0,25 5,00 0,55
14MoCrV6 14Mo6-3 14MoV6.3 1.7715 0,14 0,55 0,25 0,45 0,60 0,25