5CrNiMo Hot Forging Die Steel- SCALE STEEL.

5CrNiMo is a kind of hot die steel.Often referred to as 5CrMnMo.Both are low alloy steels (alloy content ≤5%), low carbon content, have good hardenability[SCALE STEEL] and impact toughness, used for the die with low temperature and large impact load, such as hammer forging die.

▶ 5CrNiMo、5CrMnMo Chemical Composition Comparation:

Grades 5CrNiMo 5CrMnMo
C 0.50~0.60 0.50~0.60
Si ≤0.40 0.25~0.60
Mn 0.50~0.80 1.20~1.60
Cr 0.50~0.80 0.60~0.90
Ni 1.40~1.80 ≤0.25
Mo 0.15~0.30 0.15~0.30
Cu ≤0.25 ≤0.25

5CrMnMo replaces nickel with manganese, which is the joint nickel steel of 5CrNiMo. Its strength is slightly higher than that of 5CrNiMo, but its hardenability and impact toughness are obviously lower, and its heat resistance fatigue performance [SCALE STEEL]is also slightly inferior.According to the different performance characteristics of the two, 5CrNiMo is mostly used in the manufacture of medium-sized (die height greater than 300mm) or complex cavity hot forging dies;And 5CrMnMo is suitable for making small forging dies (die height less than 300mm).
5CrNiMo has good toughness and hardenability, and is insensitive to size effect.High strength can be maintained under 400℃, but the strength drops sharply above 400℃. For example, when the temperature rises to 550℃, the yield point drops by nearly half compared with room temperature.
Hot work die steels can be divided into low heat resistant steels (350 ~ 370℃), medium heat resistant steels (550 ~ 600℃) and high heat[SCALE STEEL] resistant steels (580 ~ 650℃) according to different working temperatures.According to this definition, 5CrNiMo is a low heat resistance and high toughness hot work die steel.
There are two standards for 5CrNiMo steel in China: GB/T 24594-2009 (high quality alloy die steel) and GB/T 1299-2014 (die steel).

▶ 5CrNiMo’s Equivalent Materials in Different Standards
Standard GB AISI JIS W-Nr
Grades 5CrNiMo L6 SKT4 1.2713 1.2714
C 0.50
0.60 0.65
0.75 0.50
0.60 0.50
0.60 0.50
0.60
Si ≤0.40 0.10
0.50 0.10
0.40 0.10
0.40 0.10
0.40
Mn 0.50
0.80 0.25
0.80[SCALE STEEL] 0.60
0.90 0.65
0.95 0.60
0.90
P ≤0.030 ≤0.030 ≤0.030 ≤0.030 ≤0.030
S ≤0.030 ≤0.030 ≤0.020 ≤0.030 ≤0.030
Cr 0.50
0.80 0.60
1.20 0.80
1.20 0.60
0.80 0.80
1.20
Ni 1.40
1.80 1.25
2.00 1.50
1.80 1.50
1.80 1.50
1.80
Mo 0.15
0.30 ≤0.50 0.35
0.55 0.25
0.35 0.35
0.55
V (≤0.20) —[SCALE STEEL] 0.05
0.15 0.07
0.12 0.05
0.15

▶ Popular Brands for 5CrNiMo
DAIDO HITACHI KOSHUHA ASSAB BÖHLER
GFA DM KTV ALVAR  14 W500

▶ 5CrNiMo’s Hardness
The annealing (or normalizing) hardness of 5CrNiMo is in the range of HBW 197~241, and it can be pre-hardened to HRC 38~43 for delivery, [SCALE STEEL]and its quenching hardness can reach HRC 53~58.