German Din 1.8519 Material(31CrMoV9)

1.8519, DIN 31CrMoV9

Designation by Standards
 

Brand Name	LH No.	Mat. No.	DIN	EN	AISI
PO735	735	1.8519	31CrMoV9	-	-

Chemical Composition (in weight %)
 

C	Si	Mn	Cr	Mo	Ni	V	W	Others
0.30	max. 0.40	0.55	2.50	0.20	-	0.15	-	-

Description
Al-alloyed nitriding steel grade for large-sections.

Applications
Structural parts with high surface hardness - piston rods, extruders, cylinders, shafts, straightening tools, measuring tools, etc. 

Physical properties (avarage values) at ambient temperature
Modulus of elasticity [10³ x N/mm²]: 210 
Density [g/cm³]: 7.73

Coefficient of Linear Thermal Expansion 10^-6 oC^-1
 

-191 to +16oC	20-100oC	20-200oC	20-300oC	20-400oC	20-500oC
9.1	11.1	12.1	12.9	13.5	13.9

Continuous Cooling Transformation (CCT) Diagram

Time-Temperature Transformation (TTT) Diagram

Soft Annealing
Heat to 650-720^oC, cool slowly. This will produce a maximum Brinell hardness of 248.

Hardening
Harden from a temperature of 870-930^oC followed by oil/polymer or water quenching.

Tempering
Tempering temperature: 580-700^oC.

Nitriding
Temperature: 480-570^oC.
Surface hardness after nitriding: 800 HV

Mechanical Properties in Quenched and Tempered Condition
 

Diameter (mm)	0.2 proof stress (N/mm2)	Tensile stregth (N/mm2)	Elongation (%)	Reduction (%)	Notch impact energy (ISO-V) (J)
16-40	900	1100-1300	9	-	25
41-100	800	1000-1200	10	-	30
101-160	700	900-1100	11	-	35
161-250	650	850-1050	12	-	40

Mechanical Properties in Quenched and Tempered Condition

Forging
Hot forming temperature: 1050-850^oC.