21CrMoV5-7 / 1.7709 Steel

Chemical Composition per EN 10269

GRADE	NUMBER	C	Si	Mn	P	S	Cr	Mo	Ni	V	Al
21CrMoV5-7	1.7709	0.17-0.25	≤ 0.40	0.40-0.80	≤ 0.025	≤ 0.030	1.20-1.50	0.55-0.80	≤ 0.60	0.20-0.35	≤ 0.030

21CrMoV5-7 / 1.7709 Steel Description

Special structural steel. We can supply the 21CrMoV5-7 round bar, steel flat bar, plate, hexagonal steel bar and steel square block. 21CrMoV5-7 steel Round bar can be sawn to your required lengths as one offs or multiple cut pieces. 21CrMoV5-7 Rectangular pieces can be sawn from flat bar or plate to your specific sizes. Ground tool steel bar can be supplied, providing a quality precision finished bar to tight tolerances.

21CrMoV5-7 / 1.7709 Steel Applications

21CrMoV5-7 steel is used for engineering structural, like high tensile shafts, bolts and nuts, gears, pinions and spindles. Locomotive traction with the big gear, supercharger drive gear, pressure vessel, rear axle, gear load of connecting rod and a spring clip,21CrMoV5-7 steel can also be used to under 2000 m deep well of oil drill pipe joint and the fishing tool, and can be used for bending machine mould, etc

21CrMoV5-7 / 1.7709 Steel Mechanical Properties

Rm – Tensile strength (MPa) (+QT)

700-850

Rp0.2 0.2% proof strength (MPa) (+QT)

550

KV – Impact energy (J) (+QT)

+20° 63

A – Min. elongation at fracture (%) (+QT)

16

Z – Reduction in cross section on fracture (%) (+QT)

60

Brinell hardness   (HBW):   (+AC)	229
Brinell hardness   (HBW):   (+S)	255

21CrMoV5-7 / 1.7709 Steel Available Shapes  

Black bar /Flat bar / Square bar /Pipe, /Steel strip, /sheet

Bright – peeled + polishing, centerless grinding

Forged – ring, tube, pipe casing, discs, shaft

Physical properties (average values) at ambient temperature

Modulus of elasticity [103 x N/mm2 ]: 210 Density [g/cm3 ]: 7.80 Continuous Cooling Transformation (CCT)

21CrMoV5-7 / 1.7709 Steel Soft Annealing

Heat to 650-740 degree, cool slowly.

21CrMoV5-7 / 1.7709 Steel Hardening

Harden from a temperature of 900-950 degree followed by oil or air quenching.

21CrMoV5-7 / 1.7709 Steel Tempering

Tempering temperature: 680-740 degree.

21CrMoV5-7 / 1.7709 Steel Forging

Hot forming temperature: 1100-850degree.