31CrMoV9，1.8519 Nitrided Steel- SCALE STEEL.

31CrMoV9 steel is one kind of nitriding structural steel named by European standard; [SCALE STEEL]In GB standard the name is 31Cr3MoV.

Standards:
CHINA GB/T 37618-2019 31Cr3MoV，A31311
GERMANY DIN EN 10085:2001
(DIN 17211:1987) 31CrMoV9，1.8519
ISO ISO 683-5:2017 31CrMoV9[SCALE STEEL]

 Chemical Composition(%)
GRADE 31Cr3MoV 31CrMoV9
C 0.27~0.34 0.27~0.34
Si 0.17~0.37 ≤0.040
Mn 0.40~0.70 0.40~0.70
P ≤0.030 ≤0.025
S ≤0.030 ≤0.035
Cr 2.30~2.70 2.30~2.70
Mo 0.15~0.25 0.15~0.25
V 0.10~0.20 0.10~0.20
Ni ≤0.030 --
Cu ≤0.030 --

Property& Characteristics for 31CrMoV9，1.8519 Nitrided Steel:
(1) Good toughness;
(2) High performance in hardenability, when selecting the appropriate heat treatment process,  the diameter could be up to 70mm under[SCALE STEEL] completely quenching;
(3) After the surface nitriding, the hardness can reach 1000HV, with excellent wear resistance, as well as good anti-bite, anti-scratch ability.

Applications
31CrMoV9 after "conditioning + nitriding" service and is suitable for the need of high tensile strength and good toughness of medium-sized and large cross section component, generally do not carry heavy load, often used in the [SCALE STEEL]manufacture of the gear and the engine structure of components, such as hydraulic piston, piston rod, connecting shaft, connecting rod, steering knuckle, inner gear ring, screws and bolts, etc.