Flat Bar
Your Professional Flat Bar Supplier
Brilliance Solution,headquartered in Tianjin, China,has grown from a small scaffolding manufacturer to a leading steel products provider. Over the years, we have expanded into a modern 5,000-square-meter facility with over 100 skilled professionals. We specialize in scaffolding, formwork, steel pipes, and solar structure components, offering both standard and customized solutions to meet diverse project needs. With advanced production lines and state-of-the-art equipment, our experienced team ensures reliable, cost-effective solutions tailored to your specifications.
-
![Cold Rolled Steel Flat Bar]()
Cold Rolled Steel Flat BarMaterial:Q235B Q345B Q355B 40CR 60si2mn Q195 Q215 Q235 Q345 Q355 SS400read more
Brand:XINCHENGYUAN STEEL
Length:1-6m or as customers requires
Why choose us
Our Certificate
Our company is ISO 9001 certified，with ISO, CE, and other international safety standards (OSHA, ANSI, EN) to ensure the highest level of reliability and safety.
Global Reach & Timely Delivery
We serve clients in over 50 countries, offering flexible shipping options including FOB, CIF, and DDP to meet diverse delivery requirements on time, every time.
Custom Solutions
We provide tailored scaffolding, formwork, and steel products with specific height, load capacity, and design requirements, ensuring each product perfectly suits your project needs.
Service Advantages
Our dedicated customer support team offers rapid responses within 24 hours and provides ongoing technical assistance, ensuring your project stays on track and problems are resolved promptly.
Cold Rolled Steel Flat Bar
Cold rolled steel flat bars are essential components in numerous industrial applications, including construction, manufacturing, and automotive sectors. These bars are known for their tight tolerances and excellent mechanical properties compared to their hot rolled counterparts. This article delves into the mechanical properties of cold rolled flat bars, the various finishes available, and important considerations when selecting suppliers.
|
Product name |
Steel Flat Bar |
||||||
|
Material |
Q235B Q345B Q355B 40CR 60si2mn Q195 Q215 Q235 Q345 Q355 SS400 |
||||||
|
Brand |
XINCHENGYUAN STEEL |
||||||
|
Length |
1-6m or as customers requires |
||||||
|
Thickness |
3-60mm |
||||||
|
Width |
12-300mm |
||||||
|
Surface Structure |
Hot Rolled |
||||||
|
Delivery time |
10-15 days after your deposit, or according the quantity. |
||||||
|
Country of origin |
China |
||||||
|
Package Applications |
Bridge, vessel,roofing,car, building etc. |
||||||
|
Grade |
Rank |
Chemical Composition( %) |
|||||
|
C |
Mn |
Si |
S |
P |
|||
|
Q195 |
|
0.06~0.12 |
0.25~0.50 |
≤0.3 |
≤0.05 |
≤0.045 |
|
|
Q215 |
A |
0.09~0.15 |
0.25~0.55 |
≤0.3 |
≤0.05 |
≤0.045 |
|
|
B |
≤0.045 |
||||||
|
Q235 |
A |
0.14~0.22 |
0.30~0.65 |
≤0.3 |
≤0.05 |
≤0.045 |
|
|
B |
0.12~0.20 |
0.30~0.70 |
≤0.045 |
||||
|
C |
≤0.18 |
0.35~0.80 |
----- |
≤0.04 |
≤0.04 |
||
|
D |
≤0.17 |
≤0.035 |
≤0.035 |
||||
|
Q255 |
A |
0.18~0.28 |
0.40~0.70 |
≤0.3 |
≤0.05 |
≤0.045 |
|
|
B |
≤0.045 |
----- |
|||||
|
Q275 |
|
0.28~0.38 |
0.50~0.80 |
≤0.35 |
≤0.05 |
≤0.045 |
|
Benefits of Cold Rolled Steel Flat Bar
Superior Surface Finish
One of the most distinguishing characteristics of cold rolled steel flat bar is its smooth, refined surface. Unlike hot-rolled steel, which develops an oxide layer and surface irregularities during high-temperature processing, cold rolling is performed at room temperature, eliminating scale formation and minimizing surface imperfections.
Precise Dimensional Accuracy
Cold rolling significantly improves dimensional consistency. The process applies pressure to the steel at ambient temperature, allowing for tighter control over thickness, width, and flatness. This results in minimal tolerance variation—often within ±0.05 mm—making cold rolled flat steel ideal for precision manufacturing.
Enhanced Strength and Hardness
The cold working process induces strain hardening, increasing the tensile strength of the steel by up to 20–30% compared to its hot-rolled counterpart. This enhanced strength makes cold rolled flat steel more resistant to deformation, bending, and wear under load.
Excellent Fabrication Versatility
Despite its increased strength, cold rolled steel remains highly practical for various fabrication processes. It can be easily welded using standard techniques (MIG, TIG, or arc welding), stamped into complex shapes, drilled, bent, and machined with precision.
Types of Cold Rolled Steel Flat Bar
Cold Rolled Steel Sheets
Characterized by smooth, clean surfaces and high dimensional accuracy, cold rolled steel sheets are ideal for applications requiring aesthetic appeal and formability.
Cold Rolled Steel Strips
Narrower and often supplied in coils, cold rolled steel strips offer high strength and consistency for precision engineering applications.
Cold Rolled Steel Plates
Though less common than sheets, cold rolled plates are used when thicker, high-precision steel is required with superior flatness and surface integrity.
Applications of Cold Rolled Steel Flat Bar
Manufacturing & Fabrication Processes
Cold-rolled flat steel excels in high-precision manufacturing environments. Its uniform thickness and smooth surface make it ideal for advanced fabrication techniques such as CNC machining, laser cutting, stamping, bending, and roll forming.
Applications in Consumer Products
Due to its aesthetic appeal and structural reliability, cold-rolled flat steel is a foundational material in many consumer goods, especially where appearance and durability are equally important.
Construction & Structural Use
In the construction industry, cold-rolled steel is increasingly favored for lightweight yet strong structural elements, especially in commercial and modular buildings.
Automotive & Transportation
The automotive industry relies heavily on cold-rolled steel for both structural and cosmetic components due to its strength-to-weight ratio and surface quality.
Aerospace & High-Performance Sectors
While aluminum and composites dominate aerospace, cold-rolled steel plays a critical role in high-strength, precision components where durability is paramount.
Tools, Machinery & Industrial Equipment
Cold-rolled steel is a go-to material for manufacturing tools and machinery that demand precision, wear resistance, and long service life.
Thickness and Width of Cold Rolled Steel Flat Bar
-
Thickness Range
Typically spans from 0.5 mm to 5 mm, making it ideal for applications requiring high strength-to-weight ratios and dimensional accuracy.
-
Width Range
Commonly available from 25 mm to 200 mm, suitable for use in precision machining, frame construction, brackets, and support components.
-
Design Consideration
Thicker sections provide greater rigidity and resistance to bending, while narrower widths are often preferred for intricate assemblies or space-constrained environments.
-
Tolerance Standards
Cold-rolled steel offers tighter thickness tolerances (±0.05 mm to ±0.2 mm) compared to hot-rolled alternatives, ensuring consistency in production runs.
Finishing Options of Cold Rolled Steel Flat Bar
Matte Finish
Provides a non-reflective surface ideal for industrial components where glare reduction is important. Offers excellent adhesion for paints, primers, and powder coatings.
Polished Finish
Delivers a clean, shiny appearance suitable for consumer-facing products such as appliances, architectural trim, and decorative fixtures.
Functional Benefits
Smooth surfaces improve machinability, reduce friction during forming operations, and enhance weldability by minimizing surface contaminants.
Corrosion Resistance
While cold-rolled steel is not inherently corrosion-resistant, its smooth surface allows for more effective application of protective coatings such as zinc plating, galvanizing, or paint systems.
Processing Temperature: Cold-rolled steel is shaped at ambient temperatures, whereas hot-rolled steel is formed at high temperatures (typically above 1,700°F), allowing easier shaping but with less precision.
Dimensional Accuracy: Cold rolling produces tighter tolerances and more consistent thickness, making it ideal for precision applications.
Surface Finish: Cold-rolled steel has a smoother, cleaner surface with fewer imperfections such as scale or roughness compared to the scaly, slightly wavy finish of hot-rolled steel.
Mechanical Properties: The cold working process increases tensile strength and hardness due to strain hardening, although it reduces ductility slightly.
Best Practices for Working with Cold Rolled Steel Flat Bar
Storage
Keep in dry, climate-controlled environments to prevent surface rust; use protective film when stacking.
01
Cutting
Use sharp tools and proper feeds/speeds to avoid work hardening and burring.
02
Welding
Preheat thick sections and use low-hydrogen electrodes to prevent cracking; post-weld stress relief may be required.
03
Finishing
Degrease and abrade surfaces before painting or coating for optimal adhesion.
04
Handling
Wear gloves to prevent fingerprint corrosion and surface contamination.
05
FAQ
As one of the most professional flat bar manufacturers and suppliers in China, we're featured by quality products and good service. Please rest assured to buy durable flat bar made in China here from our factory. Contact us for more details.
c channel harga, reinforcing steel manufacturers, c channel for awning