Q235 Q345 Steel Square Bar

Q235 Q345 Steel Square Bar

Explore our premium carbon steel bars available in round, square, flat, and hexagonal shapes. Compliant with GB/T, ASTM, EN, and JIS standards, our carbon steel bars are ideal for construction, machinery, automotive, and shipbuilding industries. High strength, excellent machinability, and corrosion resistance ensure durability and reliability in diverse applications.
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Product Specifications

Product NameQ235 Q345 Steel Square Bar
StandardGB/T 699-2015, GB/T 3077-2015, ASTM A29/A29M-16a, EN 10060:2003, JIS G 4051, etc.
ShapeRound / Square / Flat/Hexagonal
MaterialQ195, Q215, Q235, Q255, Q275, Q345, Q235B, Q345B, A36, etc.
Diameter6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, etc.
Length2000mm, 3000mm, 4000mm, 5000mm, etc.
ClassificationLow-carbon steel:  Carbon content≤0.25%
Middle-carbon steel:  Carbon content≤0.6%
High-carbon steel:  Carbon content>0.6%
TechniqueHot Rolled / Cold Rolled
Carbon Content0.2%-2.11%
FeatureHigh strength, good toughness
ApplicationWidely used in automobiles, construction, machinery, pipelines and other fields


Product Details

What is Carbon Steel Bar?

Carbon steel bar is a commonly used structural material, mainly composed of carbon and iron, with small amounts of other elements. This material is widely used in fields such as construction, machinery and industrial equipment due to its high strength, high hardness and high toughness. According to the shape classification, carbon steel bars can be divided into round steel bars, square bars, flat steel bars and hexagonal bars.


Introduction of Carbon Steel Bars

Round steel bar: Due to its uniform cross-sectional shape, round steel bar is easy to be evenly stressed in various directions, showing excellent mechanical properties and machinability. Its high strength and good toughness make it the preferred material for manufacturing high-quality mechanical parts. At the same time, the smooth surface is also convenient for subsequent processing.

Square bar: Square bar has a regular geometric shape and stable mechanical properties, and its bending strength and stability are particularly outstanding. The large cross-sectional area of the square bar can withstand large loads. At the same time, the easy fixation and connection characteristics make it have significant advantages in the manufacture of structural parts.

Flat steel bar: Flat steel bar has a large width and a small thickness. This unique cross-sectional shape gives it good flexibility and plasticity. Flat steel bars are easy to bend and form. At the same time, their high strength and good corrosion resistance also enable them to maintain stable performance in a variety of environments.

Hexagonal bar: Hexagonal bar has a unique hexagonal cross-section. This design is not only beautiful, but also provides more connection points and stability. Hexagonal bars are easy to process and fix. At the same time, their uniform wall thickness and stable mechanical properties also enable them to perform well in a variety of application scenarios.

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Advantages of Carbon Steel Bars

High strength: Carbon steel bars have high strength and can withstand large loads and forces, which makes them have significant advantages in occasions where they need to withstand heavy pressure or high loads.

Low manufacturing cost: The main components of carbon steel bars are carbon and iron, which are widely and easily available, so their manufacturing cost is relatively low. This helps to reduce production costs and improve market competitiveness.

Good machinability: Carbon steel bars have good machinability and can be manufactured into parts of different shapes and sizes through cold working, hot working, etc. This flexibility enables it to meet various complex design requirements.

Strong weldability: Carbon steel bars have good welding performance and are suitable for various welding methods, such as arc welding, gas shielded welding, etc. This makes it easy to connect with other parts during the manufacturing process.

High corrosion resistance: Although carbon steel bars are prone to rust in a humid environment with oxygen, their corrosion resistance can be improved through surface treatment (such as plating, coating). After such treatment, carbon steel bars can be used in some general corrosive environments.

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Quality Control

We have our own Physical & Chemical Testing Center Lab to guarantee our product quality. Our test items & instrument fully meet international standards.


Application of Carbon Steel Bars

Mechanical manufacturing: In the field of mechanical manufacturing, carbon steel bars are often used to manufacture various mechanical parts and structural parts, such as shafts, gears, bolts, etc.

Construction engineering: In construction engineering, carbon steel bars can be used to make structural materials such as steel bars and steel beams to enhance the stability and load-bearing capacity of buildings.

Automobile manufacturing: In the automobile manufacturing industry, carbon steel bars are often used to manufacture key components such as frames and chassis to ensure the safety and durability of automobiles.

Shipbuilding: In the field of shipbuilding, carbon steel bars are used to manufacture hull structures, marine equipment, etc. to meet the use needs of ships in harsh sea conditions.

Other fields: In addition, carbon steel bars are also widely used in bridges, railways, mining machinery and other fields, as well as in the manufacture of various tools, molds and cutting tools.

Product Inventory

As a leading company, we are known for our excellent product quality and professional services, providing our customers with a reliable partner. We have a global sales network that can meet the needs of customers in different countries and regions.

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Full-Link Trust Service System

—— Guarantee services

Pre-sales Trust Services (Reducing Decision-Making Risks)

Free Samples: We provide free samples accompanied by material certificates, allowing customers to inspect the products before placing orders.

Customized Solutions: Based on customers' application scenarios, applicable standards, budgets and delivery schedules, we provide multiple sets of steel selection and cost comparison solutions, with clear marking of quality risk points and corresponding control measures.

—— Guarantee services

Pre-sales Trust Services (Reducing Decision-Making Risks)

Free Samples: We provide free samples accompanied by material certificates, allowing customers to inspect the products before placing orders.

Virtual Factory Tour + Live Factory Inspection: We offer appointment-based virtual factory tours (covering production lines, laboratories and warehouses).

Customized Solutions: Based on customers' application scenarios, applicable standards, budgets and delivery schedules, we provide multiple sets of steel selection and cost comparison solutions, with clear marking of quality risk points and corresponding control measures.

—— Guarantee services

In-sales Transparent Management (Full Process Traceability)

Loading Supervision Service: We support loading supervision by customers themselves or third-party institutions, with photo and video records provided as evidence.

Logistics Visualization: We provide bills of lading, real-time logistics tracking information and estimated port arrival time, enabling customers to inquire about the logistics status at any time.

 

—— Guarantee services

In-sales Transparent Management (Full Process Traceability)

Production Live Streaming: For orders from large customers, we provide real-time live streaming and short videos of the production process, enabling customers to witness the quality control work on site.

Loading Supervision Service: We support loading supervision by customers themselves or third-party institutions, with photo and video records provided as evidence.

Logistics Visualization: We provide bills of lading, real-time logistics tracking information and estimated port arrival time, enabling customers to inquire about the logistics status at any time.

—— Guarantee services

After-sales Support Services (Building Long-Term Trust)

Technical Support: We offer professional guidance on steel application, recommendations for welding processes, diagnosis of quality problems, and provide free technical training (both online and offline).

Customer Profile Management: We establish exclusive service profiles for each customer, recording order details, quality inspection results, delivery information and after-sales records.

—— Guarantee services

After-sales Support Services (Building Long-Term Trust)

Technical Support: We offer professional guidance on steel application, recommendations for welding processes, diagnosis of quality problems, and provide free technical training (both online and offline).

Customer Profile Management: We establish exclusive service profiles for each customer, recording order details, quality inspection results, delivery information and after-sales records. We conduct regular follow-up visits and proactively remind customers of inventory status and new product launches.

why choose us

Precision Manufacturing

Equipped with advanced production lines and a skilled workforce, we ensure high dimensional accuracy and consistent quality in every batch. Our 19 years of OEM/ODM experience enable us to handle complex custom requirements with precision and efficiency.

Material Science

Our main products include carbon steel plates, carbon steel pipes, carbon steel coils, carbon steel wires, reinforcing bars, profiles, galvanized and painted steel plates, and other carbon steel series products, as well as various stainless steel products.

Quality Controll

Our manufacturing process is backed by rigorous quality inspections at every stage—from raw material selection to final packaging. We adhere to international standards to ensure reliable performance and long-term durability of all products.

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factory Showcase

Whether it's standard industrial profiles or complex irregular structures, we can provide reliable aluminum solutions to global customers with efficient delivery and consistent quality.

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