What is the specific gravity of steel?

Specific gravity of steel is a physical quantity representing the mass of a unit volume of steel, usually measured in kg/m³ or g/cm³ . This is an important factor in structural calculations and construction material estimates.

• Standard specific gravity of carbon steel: 7,850 kg/m³ (equivalent to 7.85 g/cm³)

Depending on alloy composition, metallurgical conditions and cold/hot rolling method, this value may fluctuate slightly.

Formula for calculating steel weight by specific gravity

The formula for calculating weight (W) from volume (V) and specific gravity (γ) is as follows:

W = V × γ\textbf{W = V × γ}

In there:

• W : Steel mass (kg)
• V : Steel volume (m³)
• γ : Specific gravity (kg/m³)

For example: A solid round steel bar with a diameter of 20mm and a length of 2m has a volume of:

V=π×(d/2)2×L=3.14×(0.01)2×2=0.000628m3V = \pi × (d/2)^2 × L = 3.14 × (0.01)^2 × 2 = 0.000628 m³ W=0.000628×7850≈4.93kgW = 0.000628 × 7850 ≈ 4.93 kg

Weight lookup table of some common types of steel

Note: The above table is for reference only. You should contact Oristar directly to receive the latest updated specification and price list for each steel grade such as SUS304, SS400, SCM440, SK5, 440C...

The role of specific gravity in steel selection

• Optimizing structural design : Knowing the specific gravity helps engineers determine load-bearing capacity and select the appropriate type of steel.
• Accurate cost estimates : Minimize errors in calculating construction volume and costs.
• Save construction time : Standardization by weight allows for faster transportation and installation.

Oristar – High quality steel supplier

With over 20 years of experience in distributing and processing non-ferrous metals and stainless steel, Oristar is proud to offer steel products:

• Cold rolled and hot rolled steel plates, round steel, square steel
• Cutting, slitting, milling, polishing
• Full CO-CQ and technical certificates

Contact Oristar.vn now or call Hotline: 0988 750 686  for advice on suitable products for your project!

Conclude

The specific gravity of steel is not only a physical parameter but also a key factor in the selection of construction and mechanical materials. Let Oristar accompany you in every project with the most comprehensive and effective metal solution!

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