What is a 6mm steel rebar?
6mm rebar is a common small-diameter deformed rebar widely used in concrete structures for stirrups, distribution bars, tie bars, precast meshes, and light reinforced concrete components. Although it has a small diameter, it plays an important role in reinforcing thin-walled members, floor slabs, masonry reinforcement, and prefabricated components.
6mm rebar Basic parameters and calculations
Nominal diameter: 6 mm; Cross-sectional area ≈ 0.00002827 m² (π·d²/4).
Theoretical weight: approx. 0.222 kg/m (steel density 7850 kg/m³).
Common specification length: 6m, 9m, 12m, or cut according to customer needs.
6mm rebar Mechanical properties and grades
6mm rebar is available in different strength grades (e.g. HRB335, HRB400, or Grade 40/60 according to national standards, etc.). Common performance indicators include yield strength, tensile strength, and elongation:
yield strength (depending on grade) is typically 335–400 MPa or above;
Tensile strength is typically 20–30% higher than yield;
Elongation ≥ 8–12% (depending on the standard).
6mm rebar Construction and bending requirements
The diameter of the 6mm steel bar is small, which is easy to bend and bind. The following matters should be paid attention to during construction:
The minimum bend diameter is typically 3–4 times the diameter of the bar (i.e. 18–24 mm), depending on the material and standard.
When used as stirrups or distributed bars, cold forming is often used; in low temperature environments or high stress conditions, bending tests need to be carried out according to specifications.
Welding is generally not recommended for direct welding of small diameter hot-rolled ribbed steel bars, and if necessary, according to specifications and using adapted welding processes or mechanical connectors.
6mm rebar Antiseptic and Surface Treatment
Rebar is prone to rust when exposed to moisture or chlorine. Common protective measures include hot-dip galvanization, epoxy coating, or the use of stainless steel bars (high cost). In marine or chemically aggressive environments, anti-corrosion treatment or increased concrete sheath thickness should be prioritized.
6mm rebar Application Scenarios and Advantages
6mm steel bars are commonly used in: floor slab distribution bars, lightweight prefabricated parts, steel mesh, masonry longitudinal reinforcement, secondary steel bars of bridge deck pavement layers, etc. The advantages are low cost, convenient construction, improved concrete small crack control ability and reduced crack width.
6mm rebar FAQs
Q: Can it be used as a main bar?
A: Generally, it is not recommended to use 6mm as the main load-bearing bar, only for distribution or stirrup.
Q: How to store?
A: It should be placed vertically or overhead flat, covered with rain protection and well ventilated to reduce rust.
Q: Can 8mm be replaced?
A: Depending on the structural design requirements, there is a big difference between 6mm and 8mm in terms of force and spacing, which needs to be confirmed by the engineer.
6mm steel bar has the characteristics of small diameter, flexibility and economy, is a very important type of steel bar in modern buildings, when choosing, it is necessary to clarify the grade and standard, require the necessary quality inspection, and choose the appropriate anti-corrosion treatment according to the construction environment, so as to ensure structural safety and durability.
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