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OL7.4 chemical information,mechanical properties, physical properties, mechanical properties, heat treatment, and Micro structure, etc. It also contains the use of OL7.4

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STAS/SR OL7.4

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This page is mainly introduced the OL7.4 chemical information,mechanical properties, physical properties, mechanical properties, heat treatment, and Micro structure, etc. It also contains the use of OL7.4,such as it is commonly used in bars, sheet,plates, steel coils, steel pipes,forged and other materials application.
OL7.4

Steel Garde:OL7.4
Type:Special Alloy
Country:Romania
Standard:STAS/SR
Application:Structural steel

Relevant products:

17-4ph steel wire

T30402/X155CrVMo12...

1.4980 Round Bar

DT413 / 4Cr5MoSiV1MOD

1.4980

45Cr14Ni14W2Mo forging

D6AC Forging Hollow Bar

GH 3536 Sheet

4145H Hollow Bar

Monel400 round bar

Cross Reference Table(Equivalent Materials):

Material	Standard	Country
OL70.1	STAS/SR	Romania
Q345q E		China
Q345q C		China
4CrW2Si		China
Cr4W2MoV		China
6W6Mo5Cr4V		China
5Cr4W5Mo2V		China
4CrMnSiMoV		China
4Cr3Mo3SiV		China
4Cr5MoSiV		China
4Cr5MoSiV1		China
4Cr5W2VSi		China
SM45		China
SM50		China
SM4Cr5MoSiV		China
SM4Cr5MoSiV1		China
SM4Cr13		China
SM45A		China
SM48		China
W18Cr4V		China
W18Cr4VCo8		China
W18Cr4V2Co8		China
W12Cr4V5Co5		China
W6Mo5Cr4V2		China
CW6Mo5Cr4V2		China
W6Mo5Cr4V3		China
CW6Mo5Cr4V3		China
W2Mo9Cr4V2		China
W6Mo5Cr4V2Co5		China
W7Mo4Cr4V2Co5		China
W2Mo9Cr4VCo8		China
W9Mo3Cr4V		China
W6Mo5Cr4V2Al		China
W9Mo3Cr4V coil		China
YG4C		China
H14	ASTM	USA
T20814	UNS	USA
H24	ASTM	USA
T20824	UNS	USA
H41	ASTM	USA
T20841	UNS	USA
H42	ASTM	USA
T20842	UNS	USA
H43	ASTM	USA
T20843	UNS	USA
A4	ASTM	USA
T30104	UNS	USA
T30403	UNS	USA
D4	ASTM	USA
T30404	ASTM	USA

Chemical composition(mass fraction)(wt.%)

Mechanical Properties

Tensile strength	717～810	σb/MPa
Yield Strength	272	σ 0.2 ≥/MPa
Elongation	38	δ5≥(％)
ψ	-	ψ≥(％)
Akv	-	Akv≥/J
HBS	272～411	-
HRC	30	-

Physical Properties

Thermal expansion	83-68	e-6/K
Thermal conductivity	49-18	W/m.K
Specific heat	450-460	J/kg.K
Melting temperature	6567-5815	째C
Density	4032-4294	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)
OL7.4 Special Alloy	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