6150 steel

AISI 6150 steel is an alloy spring steel. It has great mechanical properties and processing properties. And it also can be called ISO 51CrV4 steel and 1.8159 steel. It has high hardenability, fatigue strength and yield strength. By the way, add the vanadium to steel to make crystalloid get smaller, decrease the overheating sensitivity, raise the strength and toughness of steel. But its weldability is not good. If you feel interested in it, you can check 6150 steel round bar sheet plate properties, chemical composition and heat treatment as below.

51CrV4 Steel Applications

  1. Due to its special properties, it was used in the field of the aircraft industry, automobile, boats, ships, metallurgy, chemical industry and etc. As the material of ships, it usually is used in the low-temperature condition. So it must have great general mechanical performance at the room temperature condition. The plasticity and impact toughness of steel is related closely to the microstructure. If the strength raises, the plasticity and impact toughness of steel will decrease.
  2. 51CrV4 steel is a higher level of spring steel. It is good material for spring with high load and big size cross-section and the valve spring.
  3. It can also be used for the overall quenching of steel for plastic molds and die-casting molds.

6150 Steel Round Bar Heat Treatment


The annealing processing can make it go get great machinability. Austenitizing at 1400ºF (760ºC) followed by an iso anneal at 1250ºF (680ºC.)


The standard temperature for normalizing is 1650ºF (900ºC.), then use the way of air cooling.


Austenitize 6150 steel at 1550-1625ºF (845-885). And use the oil quenching way for the small one, but the large one is to use the water quenching.


From 1000-1250ºF(540-680ºC) as per required properties.


6150 Steel Sheet Physical Properties

Density7.85 g/cm³0.284 lb/in³

51CrV4 Steel Mechanical Properties

Tensile strength, ultimate670 MPa97200 psi
Tensile strength, yield415 MPa60200 psi
Izod impact27 J19.9 ft-lb
Modulus of elasticity190-210 GPa27557-30458 ksi
Shear modulus (typical for steel)80 GPa11600 ksi
Bulk modulus (typical for steel)140 GPa20300 ksi
Poissons ratio (calculated)0.27 – 0.300.27-0.30
Elongation at break (in 50 mm)23%23%
Hardness, Brinell197197
Hardness, Vickers (converted from Brinell hardness)207207
Hardness, Knoop (converted from Brinell hardness)219219
Hardness, Rockwell B (converted from Brinell hardness)9292
Hardness, Rockwell C (converted from Brinell hardness, value below normal HRC range, for comparison purposes only)1313
Machinability (annealed and cold drawn. Based on 100% machinability for AISI 1212 steel)5555

aisi 6150

1.8159 Steel Chemical Composition

GB/T 1222-20070.46-0.540.50-0.80Max 0.025Max 0.0250.17-0.370.80-1.100.10-0.20Max 0.35Max 0.25
ASTM A29/A29M-050.48-0.530.70-0.90Max 0.035Max 0.0400.15-0.350.80-1.10Min 0.15//
EN 10089-20020.47-0.550.70-1.10Max 0.025Max 0.025Max 0.400.90-1.200.10-0.25//
JIS G4801-20050.47-0.550.65-0.95Max 0.030Max 0.0300.15-0.350.80-1.100.15-0.25//
ISO 683/14:20040.47-0.550.70-1.10Max 0.030Max 0.030Max 0.400.90-1.200.10-0.25//

51CrV4 Steel Grade Equivalent Chart

StandardGB/T 1222-2007ASTM A29/A29M-05EN 10089-2002JIS G4801-2005ISO 683/14:2004
Grades50CrVA (A23503)615051CrV4(1.8159)SUP1051CrV4

6150 Steel Round Bar Plate Sheet Suppliers

We are a professional special steel stockist and supplier with a high-quality stand for many years. We have our own cutting and processing equipment. Specifications can be cut and customized according to your requirements. As a professional 51CrV4 steel supplier, please contacts us for any request for it. Songshun Steel always with you.