Cold-rolled steel: Structure, advantages, applications and price quotes 2026

Galvanized steel, or galvanized steel, is a type of thin-rolled steel coated with an aluminum-zinc alloy layer containing 55% aluminum, 43,5% zinc and 1,5% silicon. This special coating creates corrosion resistance many times superior to conventional galvanized steel, while also having good heat reflection ability, helping to effectively reduce heat for construction works.

The product is widely used in 4 main types of construction: Civil houses, factories and plants, commercial buildings, as well as making signs and decorations. Cold-rolled steel has a lifespan of over 20 years if installed properly, with light weight for easy construction and transportation.

In Vietnam, cold-rolled steel must meet four strict technical standards including TCVN 4:8491, TCVN 2012:7501, TCVN 2006:6653 and TCVN 2013:7974. According to data from June 2009, the price of cold-rolled steel ranges from VND 6 to VND 2025/m² depending on the thickness from 89.000mm to 155.000mm.

What is cold rolled steel?

Galvanized steel, also known as galvanized steel, is a type of thin-rolled steel coated with an aluminum-zinc alloy layer (usually consisting of 55% aluminum, 43,5% zinc and 1,5% silicon). This plating process creates an effective protective layer, giving the product superior corrosion resistance, even when exposed to high humidity or harsh climates.

The aluminum component in the plating layer acts as a mechanical barrier, preventing environmental impacts such as moisture or corrosive chemicals. Meanwhile, zinc acts as an electrochemical protective layer, preventing the base metal from being oxidized at the cutting edges or scratches.

What are the advantages of galvanized steel?

Galvanized aluminum corrugated iron is increasingly used in many civil and industrial construction projects thanks to 6 advantages: Good heat reflection, high durability, easy construction, corrosion resistance, flexible application in many projects and reasonable price.

1. Good heat reflection, helps reduce heat: The corrugated iron surface has the ability to reflect sunlight, thereby reducing heat absorption and cooling the space.
2. High durability, long life: Galvanized aluminum sheet can be used for over 20 years if installed and maintained properly, helping to reduce repair costs.
3. Easy to construct and transport: Light weight makes transportation, loading and unloading and installation easier, saving time and effort in construction.
4. Outstanding corrosion and rust resistance: The aluminum-zinc alloy coating helps the corrugated iron surface to be resistant to humid environments, near the sea or polluted areas.
5. Suitable for many types of projects: With its sturdy structure and high adaptability, galvanized aluminum corrugated iron is flexibly used for roofing, partitions, factories, warehouses or prefabricated houses.
6. Reasonable investment cost: Despite its many advantages, the price of cold-rolled steel is still quite competitive compared to materials with similar functions.

What are the disadvantages of zinc aluminum alloy coated steel?

Although possessing many advantages in terms of durability and corrosion resistance, aluminum-zinc alloy coated steel still has 3 limitations that need to be noted: Easily scratched, noisy in heavy rain and can affect the environment during production.

1. Easily scratched during construction: The surface of corrugated iron has a fairly thin coating. If not properly stored and transported, it is easily scratched, affecting aesthetics and durability.
2. Makes noise when it rains heavily: Due to the metal structure, when it rains heavily, water hitting the corrugated iron roof often creates a resounding sound, which can easily cause discomfort if there is no soundproofing solution.
3. The manufacturing process can affect the environment: If the waste treatment stage in the alloy plating process is not well controlled, production activities can cause environmental pollution.

What technical standards must cold-rolled steel in Vietnam meet?

To ensure the quality and durability of construction works, cold-rolled steel in Vietnam must comply with four strict technical standards: TCVN 4:8491, TCVN 2012:7501, TCVN 2006:6653 and TCVN 2013:7974.

1. TCVN 8491:2012: Applicable to galvanized steel and aluminum-zinc coated steel (including Galfan), this standard gives detailed requirements for thickness, geometric dimensions, mechanical properties and corrosion resistance of the coating.
2. TCVN 7501:2006: For unsurfaced or unplated base steel, this standard helps control the quality of input materials by parameters such as thickness, tensile strength and elongation.
3. TCVN 6653:2013: Focusing on painted corrugated iron products, this standard specifies requirements for paint adhesion, color fastness and weather resistance.
4. TCVN 7974:2009: This is the standard for galvanized steel sheets coated with multiple layers of zinc, aluminum-zinc or zinc-aluminum-silicon alloy. Products meeting this standard have good oxidation resistance, heat resistance and increased overall durability.

What projects are cold-rolled steel panels applied to?

Thanks to its high durability and good insulation, cold-rolled steel sheets are flexibly used in 4 types of constructions: civil, industrial, commercial, and signboard and backdrop works.

1. Residential ceiling: Cold-rolled steel is a popular choice for roofing houses, villas or apartments. The product is not only effective in heat resistance but also comes in many colors, easy to coordinate with different architectural styles.
2. Ceilings, partitions, walls of factories and workshops: In industrial constructions, cold-rolled steel is popular thanks to its good insulation and corrosion resistance.
3. Commercial building roofs: Cafes, restaurants, shops or shopping malls also use cold-rolled steel for roofing thanks to its durability, ease of installation and maintenance.
4. Signs, backdrops in decoration and advertising: Some units use cold-rolled steel to make signs, backdrops or decorative details thanks to its hardness, ease of shaping and high durability.

What are the classifications of cold rolled steel?

Galvanized aluminum sheet can be classified based on 3 aspects: Number of waves, wave shape and color of sheet. Specifically as follows:

Based on the number of waves

Based on the number of waves, cold-rolled steel is divided into 5 different types, from 5 to 11 waves. Each type has its own size, height and distance between waves:

1. 5-wave cold-rolled steel: Has a width of 1070mm, with a distance between wavelengths of 250mm and a wave height of 32mm.
2. 6-wave cold-rolled steel: Has a design similar to the 5-wave type, with a width of 1065mm, a wavelength of 250mm and a wave height of 32mm.
3. 7-wave cold-rolled steel: There is a smaller size, only 1000mm, with a wavelength of 166mm and a wave height of 25mm.
4. 9-wave cold-rolled steel: Reduce the wavelength to 125mm, keep the width 1000mm and the wave height is 21mm.
5. 11-wave cold-rolled steel: The type with the most waves, width 1070mm, wavelength only 100mm and lowest wave height is 18.5mm.

Based on wave shape

Cold-rolled steel is classified into 5 different corrugated shapes including square corrugated, round corrugated, tile corrugated, Cliplock corrugated and Seamlock corrugated, to meet diverse construction needs:

1. Square corrugated iron: Characterized by evenly spaced square waves, creating a strong, solid feeling.
2. Round corrugated iron: Designed with soft curves, usually in round or oval wave form.
3. Corrugated tile: Simulates the shape of traditional tiles, creating a classic, elegant beauty.
4. Cliplock corrugated iron: This type of corrugated iron does not use screws directly mounted on the surface, but instead uses a clamping system.
5. Seamlock corrugated iron: Designed with seamless edge locking, allowing for quick and safe construction.

Based on color

Galvanized aluminum sheet is divided into many different types based on color, including: Turquoise green, blue, cream yellow, burgundy red, silver gray, moss green, metallic copper, bright red. The diversity of

How much does cold rolled steel cost?

According to data updated by Kosmos in June 6, the price of cold-rolled steel currently ranges from about 2025 to 89.000 VND per square meter.

Important note: Specific prices may vary depending on the quantity of products ordered, current promotions or individual sales policies of each dealer and distributor.

Frequently asked questions about galvanized steel

What to note when choosing to buy cold-rolled steel sheets?

To ensure the quality and longevity of the project, consumers need to pay attention to 3 important points when choosing cold-rolled steel: Check the product quality, consult with experts and prioritize genuine products with warranty.

1. Check product quality: Carefully observe the surface of the corrugated iron before buying, avoid choosing panels with signs of rust, scratches or warping. Small initial defects can affect the durability and efficiency of use later.
2. Consult with experts: In case you are not sure which type of corrugated iron is suitable for your needs, you should consult with the supplier or a professional engineer to choose the most suitable one for each climate condition and type of construction.
3. Priority for genuine products with warranty: Choosing cold-rolled steel from a reputable brand, has clear warranty policy will help users feel more secure about the durability, heat resistance and long-term use value of the project.

>>> Learn more about Kosmos foam panels, detailed sizes and designs:

What is the difference between cold rolled steel and galvanized steel?

Although both are metal materials commonly used in construction, cold-rolled steel and galvanized steel have distinct differences in composition, corrosion resistance, price and scope of use:

1. About surface coating: Cold-rolled steel is coated with an aluminum-zinc alloy (Al-Zn) layer with a standard ratio of 95% zinc and 5% aluminum. Meanwhile, galvanized steel is only coated with pure zinc.
2. Corrosion Resistance: Thanks to the aluminum component in the coating, cold-rolled steel is more resistant to rust and harsh environments than galvanized steel.
3. Price: Cold-rolled steel is often more expensive because of its superior technical properties and durability compared to galvanized steel.
4. Application range: Cold-rolled steel is suitable for projects requiring high durability and weather resistance such as roofs of civil houses, factories, warehouses. Meanwhile, galvanized steel is often used for simpler items such as fences, roofs, etc.
   

Is galvanized steel easy to rust?

Galvanized aluminum sheet has good rust resistance thanks to the aluminum-zinc alloy coating that protects the surface. However, if the coating is scratched or used in highly corrosive environments such as coastal areas or chemicals, the rust resistance may decrease. Therefore, proper storage and construction are required to maintain the durability of the product.

Can cold-rolled steel be combined with other materials to aid insulation?

Cold-rolled steel can be completely combined with Nano panel, fluted panel to increase insulation. This is a very suitable choice for ceiling cladding thanks to its heat-resistant, durable, waterproof and termite-resistant properties. When combining cold-rolled steel with SPC/PVC plastic panels, the space will become more luxurious and modern, while still ensuring moisture resistance and durability.

>>> Learn more about the solution of heat-resistant ceiling cladding for factory roofs with fluted panels:

Kosmos plastic panels are interior decoration materials that are especially suitable for environments with high humidity or requiring quick construction. In addition to technical advantages, Kosmos plastic panels also have diverse designs, are easy to clean and have a durability of up to 10 - 15 years. This is considered an ideal solution for those looking for comfort, aesthetics and long-term durability in their living space.

Galvanized steel is a construction material with a special structure with an aluminum-zinc coating that increases durability, corrosion resistance and effective insulation. Thanks to its outstanding advantages, galvanized steel is widely used in many civil and industrial works. Although the price may vary depending on the thickness and supplier, this is still a worthy investment for items that require high durability and aesthetics.