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

Location » Home » Grades > Special Alloy > OL7.4

STAS/SR OL7.4

Profile

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

Chemical composition(mass fraction)(wt.%)

Mechanical Properties

Tensile strength 134~619 σb/MPa
Yield Strength 992 σ 0.2 ≥/MPa
Elongation 26 δ5≥(%)
ψ - ψ≥(%)
Akv - Akv≥/J
HBS 699~625 -
HRC 30 -

Physical Properties

Thermal expansion 65-15 e-6/K
Thermal conductivity 70-92 W/m.K
Specific heat 450-460 J/kg.K
Melting temperature 1050-8796 째C
Density 8185-7068 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

Technical specification/standard for download