OPTIM 700 High Strength Structural Steel

Australian Steel is your home for Optim 700 high strength steel in Melbourne, providing manufacturers and builders with the necessary materials to construct and create high-quality products and structures.

Common Applications

Renowned for its superior level of weldability, bendability and its excellent cutting properties, Optim 700 structural steel is a popular choice for builders and manufacturers of:

  • Frame structures
  • Mobile vehicles
  • Commercial vehicle superstructures
  • Equipment specifically designed for load-handling
  • And more


Optim 700 Properties and Features

When you order your quantity of Optim 700 structural steel from Australian Steel, you’ll soon discover the metal’s extensive range of properties and features. Among these are:

  • High-strength steel
  • Superior bendability
  • Enhanced ability to be cut into any size or shape with plasma, laser or other methods
  • Greater impact strength

Optim 700 structural steel is available in sheets, steel plates and coils, plus it more than meets the standards of EN 10149-2.


Mechanical properties: tensile test. Optim 700 steels. Tensile test, longitudinal testing.

Plate Thickness
Yield Strength
eH or Rp0,2 MPa
Tensile Strength
m MPa
Elongation %
801) A
3 – 10700 2)750 – 950N/A 13

Yield and tensile strength are tested longitudinal to the rolling direction, and guaranteed both in the longitudinal and transverse directions.
1) Elongation A80 is used for thickness below 3mm.
2) For thickness >8 mm, the minimum yield strength can be 20 MPa lower, according to EN 10149-2.

Mechanical Properties: Impact Strength Test

Optim 700 steels. Impact strength, longitudinal testing.

Test Temperature,
Energy Level
Test Temperature,
Energy Level
-20°C 40J minimum-40°C 27J minimum

The requirement value 40 J means tests carried out with 10 x 10 longitudinal standard test pieces. When testing thicknesses less than 10mm, the width of the test pieces corresponds with the strip thickness and the requirement values decrease in direct relation to the surface area of the test piece. No impact tests are carried out for thicknesses less than 6mm.

Chemical Composition Content % (Ladle Analysis)

% ave. 0.41 max.

In addition, niobium (Nb), vanadium (V), titanium (Ti), boron (B), molybdenum (Mo), nickel (Ni) or copper (Cu) may be used as alloying elements either singly or in combination.
CEV = C + Mn/6 + (Cr + Mo + V)/5 + (Ni + Cu)/15


Minimum permissible bending radius, bending angle 90°, in all directions
Minimum permissible inside bending radius mm

Thickness mm
t ≤ 3
3 < t ≤ 6 6 < t ≤ 10 t > 10

Heat Treatment

If relieving of residual stresses is required, Optim 700 steels may be annealed at temperatures of +530°C to +580°C. Heating the steel to temperatures higher than +580°C reduces its strength.

Heat Treatment Temperature °C Treatment time & manner of cooling
Stress relieving+530°C – +580°C
(target +560°C)
2 minutes/mm thickness, minimum 30 minutes.
Slow cooling in furnace.

Too high temperature and long treatment time may weaken mechanical properties.

Order from Australian Steel Today

When you need Optim 700 steel materials for your next project, Australian Steel is your one-stop destination. As one of the leading Optim 700 steel suppliers in Melbourne, we can deliver to your metropolitan worksite or you can pick up from our Braeside yard. If you’d like further information on any of our products and services or Australian steel grades, including Optim 700 stock levels, give us a call today on (03) 9580 2200.