Product details description
Galvanized square steel, with its corrosion-resistant zinc coating, is
widely used in construction, framing, and machinery. Its production integrates
steelmaking, shaping, and galvanizing into a seamless process that ensures
uniform coating and structural integrity.
It begins with steelmaking and billet preparation. Raw materials (scrap,
pig iron) are melted in electric arc furnaces, refined to control carbon and
impurity levels, then cast into square-section billets. Billets are inspected
for internal defects and surface quality before reheating to 1100–1200°C for hot
rolling.
Hot rolling shapes the square profile. Billets pass through a series of
rolling stands that progressively reduce cross-section while elongating the
steel, forming square bars of precise dimensions (e.g., 10×10 mm to 100×100 mm).
Controlled cooling after rolling prevents warping and ensures consistent
mechanical properties.
Cutting and straightening follow rolling. Bars are cut to specified lengths
using saws or shears, then passed through straighteners to eliminate curvature.
Surface descaling removes oxide layers, preparing the steel for galvanizing and
improving coating adhesion.
Galvanizing applies the protective zinc layer. Bars are cleaned (pickling
in acid, fluxing) to remove oxides and scale, then immersed in a molten zinc
bath at ~450°C. The zinc reacts with iron to form zinc-iron alloy layers topped
by a pure zinc coating. Immersion time and temperature control yield uniform
coating thickness (typically 50–100 μm).
Quality control and finishing finalize the product. Coating thickness is
measured with magnetic gauges; adhesion tests ensure the zinc layer bonds
firmly. Bars may be further processed (drilling, welding) for specific
applications. Packaging protects against transit damage. This integrated process
delivers square steel that combines strength, durability, and long-term
corrosion resistance for diverse industrial uses.
Previous article：
Structural Strength: Comparing Galvanized Square Steel to Round Tubing
Next article：
Galvanized Square Steel Cutting and Fabrication Methods
