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O7 chemical information,mechanical properties, physical properties, mechanical properties, heat treatment, and Micro structure, etc. It also contains the use of O7

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ASTM O7

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This page is mainly introduced the O7 chemical information,mechanical properties, physical properties, mechanical properties, heat treatment, and Micro structure, etc. It also contains the use of O7,such as it is commonly used in bars, sheet,plates, steel coils, steel pipes,forged and other materials application.
Oil-Hardening Tool Steel

Steel Garde:O7
Type:Tool Die Steels
Country:USA
Standard:ASTM
Application:Oil-Hardening Tool Steel

Relevant products:

UNS NO7718 Coil/Strip/Sheet

UNS NO7718/ Inco...

Cross Reference Table(Equivalent Materials):

Material	Standard	Country
40CrMnMo7	DIN	Germany

Chemical composition(mass fraction)(wt.%)

Elements	Min.（≥）	Max.（≤）
C	1.10	1.30
Si	0.10	0.60
Mn	0.20	1.00
P		0.030
S		0.030
Cr	0.35	0.85
Mo		0.30
V	0.15	0.40
W	1.00	2.00
Ni＋Cu		0.75

Mechanical Properties

Tensile strength	182～087	σb/MPa
Yield Strength	814	σ 0.2 ≥/MPa
Elongation	52	δ5≥(％)
ψ	-	ψ≥(％)
Akv	-	Akv≥/J
HBS	412～609	-
HRC	30	-

Physical Properties

Thermal expansion	99-51	e-6/K
Thermal conductivity	61-20	W/m.K
Specific heat	450-460	J/kg.K
Melting temperature	4732-6728	째C
Density	0327-4461	kg/m³
Resistivity	0.50-0.60	Ohm.mm²/m

Heat Treatment Regime

Annealing	Quenching	Tempering	Normalizing	Q & T
√	√	√	√	√

Size Availability

Steel Grade	Specification	Processing range(mm)
O7 Tool Die Steels	Round Bar and Hollow Bar	Φ1 to Φ2000
	Square and Flat Steel	Φ10 to Φ100
	Plate and Sheet	0.08-800(Thickness)10-1500(Width)Length
	Tube or Pipe	OD:Φ4-410; WT:1-35 mm; Lenght:10-12000
	Coil and Strip Steel	THK:0.1mm Width:1500mm
	Forged	Ring/Cylindrical/Disk