Hot Rolled and Galvanized Steel Flat Bar

ZHONGTIAN supplies Hot Rolled and Galvanized Steel Flat Bar for structural fabrication, construction, grounding systems, machinery, equipment supports, and general metalworking. Standard sizes cover widths of 10–300mm and thicknesses of 3–60mm, with 6m, 9m, and 12m lengths available.

Q235B and Q355B are available for different structural requirements. Buyers can select hot rolled, cold drawn, or galvanized options according to strength, dimensional accuracy, surface requirements, corrosion exposure, and project budget.

Size and Supply

Standard Sizes

Commonly requested sizes include 25#, 30#, 40#, 50#, and 60#. Non-standard widths, thicknesses, lengths, and special-shaped flat bars can be produced according to drawings or project specifications.

Fixed-length cutting is available to reduce offcuts and simplify fabrication. Buyers can specify 6m, 9m, 12m, or other required lengths.

Dimensional Tolerance

Width, thickness, straightness, and flatness are controlled during production. The actual tolerance depends on the production process and applicable material standard.

For projects requiring specific dimensional tolerances, buyers should provide the applicable ASTM, EN, JIS, GB, or project standard when requesting a quotation.

Material and Process

Q235B and Q355B

Q235B is suitable for general structural fabrication, brackets, frames, supports, embedded parts, and other applications requiring standard structural steel.

Under GB/T 700, Q235B has a minimum yield strength of 235 MPa for applicable smaller thickness ranges, with tensile strength typically specified at 370–500 MPa.

Q355B is suitable for applications requiring higher structural strength. Under GB/T 1591, the minimum yield strength is 355 MPa for applicable smaller thickness ranges, while tensile strength is typically specified at 470–630 MPa.

Final mechanical properties should be confirmed against the material certificate and applicable standard for the ordered thickness.

Hot Rolled

Hot rolled flat bar provides a practical combination of structural strength, weldability, and cost efficiency. It is commonly selected for steel structures, equipment bases, brackets, frames, and load-bearing fabrication.

Cold Drawn

Cold drawn flat bar offers improved dimensional accuracy and a smoother surface compared with conventional hot rolled material. It is more suitable for precision machining, mechanical components, and applications where surface appearance and dimensional consistency are important.

Galvanized

Galvanized steel flat bar uses a zinc coating to provide additional protection against moisture and atmospheric corrosion. It is suitable for grounding systems, outdoor supports, construction components, and engineering applications.

For Southeast Asian markets, including the Philippines, Singapore, Thailand, and Malaysia, galvanized material can be considered for applications exposed to humid or outdoor conditions.

Process Comparison

Selecting the Right Finish

For projects requiring a balance between structural performance and price, hot rolled material is generally appropriate. Cold drawn material is preferable for tighter dimensional and surface requirements, while galvanized material is better suited to corrosion-exposed environments.

Galvanized Protection

Zinc Coating

The zinc coating helps protect the steel substrate from moisture and atmospheric corrosion. This makes Hot Rolled and Galvanized Steel Flat Bar suitable for outdoor supports, grounding systems, infrastructure components, and other engineering applications.

The required zinc coating thickness or coating mass depends on the applicable galvanizing standard and customer specification. Since the product information does not define one universal coating thickness, the exact requirement should be confirmed before production.

Buyers requiring a specific zinc coating thickness or coating mass can include the requirement in the RFQ for confirmation.

Fabrication

Cutting and Drilling

The flat geometry is suitable for sawing, shearing, drilling, and machining. Cut-to-length supply can reduce on-site processing and material waste.

Clean cut ends also make subsequent welding, drilling, and assembly more convenient.

Welding and Bending

Q235B and Q355B flat bars can be used for welded structures when the selected grade, thickness, and fabrication process meet the project requirements.

Typical fabricated products include steel frames, equipment bases, brackets, embedded parts, structural connections, and supports.

Application Areas

Construction

Hot Rolled and Galvanized Steel Flat Bar can be used for structural connections, embedded parts, supports, brackets, frames, and other construction-related steel components.

Grounding

Galvanized flat bar is suitable for grounding and earthing systems where additional corrosion protection is required. Installation should comply with applicable local electrical and engineering standards.

Machinery

Hot rolled and cold drawn options can be used for machine frames, equipment bases, mechanical components, brackets, and supports.

Outdoor Engineering

Galvanized material is suitable for outdoor structures, infrastructure components, fencing supports, brackets, and other applications exposed to moisture.

Southeast Asia Supply

Philippines

For construction, grounding, and outdoor engineering projects in the Philippines, galvanized flat bar provides additional protection in humid and exposed environments. Customized cutting can also reduce fabrication work at the project site.

Singapore

Singapore projects can use flat bar for construction, infrastructure, equipment supports, and fabrication. Consistent dimensions and customized lengths help simplify downstream processing.

Thailand and Malaysia

In Thailand and Malaysia, the material is suitable for structural fabrication, machinery, equipment supports, grounding systems, and outdoor engineering. Hot rolled and galvanized options can be selected according to the operating environment and required surface protection.

Custom Orders

Non-Standard Sizes

ZHONGTIAN supports customized widths, thicknesses, lengths, and special-shaped flat bars for project-based and large-volume orders.

For specific tolerance, zinc coating, or mechanical property requirements, customers can provide drawings, material standards, or inspection specifications before production.

Cut-to-Length

6m, 9m, and 12m are common supply lengths. Customized cutting can be arranged according to project dimensions to reduce unnecessary offcuts and additional processing.

Procurement Information

Before purchasing Hot Rolled and Galvanized Steel Flat Bar, buyers should confirm the width, thickness, length, steel grade, manufacturing process, surface finish, applicable standard, dimensional tolerance, zinc coating requirement, quantity, and delivery destination.

For example, an RFQ can specify Q235B or Q355B, 50 × 6mm, galvanized finish, 6m fixed length, required zinc coating standard, and project quantity.

ZHONGTIAN can evaluate standard and non-standard requirements and provide relevant material and inspection documentation according to the agreed specification.

Frequently Asked Questions

What sizes are available?

ZHONGTIAN supplies standard widths from 10–300mm and thicknesses from 3–60mm. Common sizes include 25#, 30#, 40#, 50#, and 60#. Lengths of 6m, 9m, and 12m are available, with custom sizes and cut-to-length service for project orders.

What steel grades can I choose?

Q235B and Q355B are the main available grades. Q235B is commonly used for general structural fabrication, while Q355B is suitable for applications requiring higher yield strength. Other grades can be discussed according to the required material standard.

What is the difference between hot rolled and galvanized flat bar?

Hot rolled flat bar is generally selected for structural strength and cost efficiency, while galvanized flat bar has a zinc coating that provides additional corrosion protection. For outdoor construction, grounding, and humid environments, galvanized material is often the more suitable option.

What should I include in an RFQ?

For Hot Rolled and Galvanized Steel Flat Bar, buyers should provide the required width, thickness, steel grade, manufacturing process, zinc coating requirement, length, quantity, applicable standard, tolerance, and delivery destination. Drawings or inspection requirements can also be provided for customized orders.