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L7 chemical information,mechanical properties, physical properties, mechanical properties, heat treatment, and Micro structure, etc. It also contains the use of L7

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SAE L7

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This page is mainly introduced the L7 chemical information,mechanical properties, physical properties, mechanical properties, heat treatment, and Micro structure, etc. It also contains the use of L7,such as it is commonly used in bars, sheet,plates, steel coils, steel pipes,forged and other materials application.
Low Alloy Tool Steel

Steel Garde:L7
Type:Tool Die Steels
Country:USA
Standard:SAE
Application:Low Alloy Tool Steel

Chemical composition(mass fraction)(wt.%)

Elements	Min.（≥）	Max.（≤）
C	0.95	1.05
Si	0.20	0.40
Mn	0.25	0.45
Cr	1.25	1.75
Mo	0.30	0.50
V
W

Mechanical Properties

Tensile strength	400～143	σb/MPa
Yield Strength	867	σ 0.2 ≥/MPa
Elongation	82	δ5≥(％)
ψ	-	ψ≥(％)
Akv	-	Akv≥/J
HBS	372～629	-
HRC	30	-

Physical Properties

Thermal expansion	55-44	e-6/K
Thermal conductivity	13-25	W/m.K
Specific heat	450-460	J/kg.K
Melting temperature	0292-0905	째C
Density	1125-9188	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)
L7 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