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Mechanical ISO 4957 Grade 40CrMnMoS8-6 Cold Tool Steel Bar

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SHANGHAI UNITE STEEL

Mechanical ISO 4957 Grade 40CrMnMoS8-6 Cold Tool Steel Bar

Country/Region	china
City & Province	shanghai shanghai

Product Details

ISO 4957 Grade 40CrMnMoS8-6

TYPICAL APPLICATIONS

Alloy tool steel is widely used to produce the cutting tool, cold/heat distortion mould and measuring implements,

and further to manufacture the piston, valve, valve seat of fuel pump of diesel engine.

Cutting tools

Mechanical parts

Air hammer tools

Piercing tools

PRODUCT DESCRIPTION

The alloy is usually produced by EAF /VD /LF followed by electroslag refining (ESR) if necessary for special purpose.

Bars and, where applicable, forgings are subjected to ultrasonic examination based on the different level according to the buyers' requirements.

Bars are usually supplied bright in the softened condition.

Final heat treatment - heat treatment / QT

※ MATERIAL SPECIFICATIONS

EN ISO 4957: 2000 , DIN 17350 (1980)

※ AVAILABLE SHAPES

Black bar /Flat bar /Square bar

Bright - peeled + polishing /centerless grinding / peeled + slidabrading

Forged - ring /tube /pipe casing /discs /shaft

Chemical composition(mass fraction)(wt.%)

Elements	Min.(≥)	Max.(≤)
C	0.35	0.45
Si	0.30	0.50
Mn	1.40	1.60
P		0.030
S	0.05	0.10
Cr	1.80	2.00
Mo	0.15	0.25
V

Mechanical Properties

Tensile strength	206～844	σb/MPa
Yield Strength	398	σ 0.2 ≥/MPa
Elongation	94	δ5≥(％)
ψ	-	ψ≥(％)
Akv	-	Akv≥/J
HBS	558～382	-
HRC	30	-

Physical Properties

Thermal expansion	86-93	e-6/K
Thermal conductivity	28-75	W/m.K
Specific heat	450-460	J/kg.K
Melting temperature	6414-0429	째C
Density	9843-3299	kg/m³
Resistivity	0.50-0.60	Ohm.mm²/m