Carbon Steel Bar Suppliers & Manufacturers

Welcome to Huaxiao Metal! As a carbon steel bar supplier, we proudly have over a decade of experience in manufacturing and exporting carbon steel metal. We are committed to providing high quality carbon steel rods to our global customers and stand out with competitive carbon steel rod prices.

In our factory, we have advanced production equipment and strict quality control processes to ensure that every carbon steel bar meets the highest standards. Whether you need carbon steel rods in standard sizes or custom specifications, we have what you need.

Carbon Steel Bar Suppliers In China

As one of the trusted carbon steel bar suppliers and manufacturers in China, our delivery time is about 7-25 days, and we supply carbon steel bars with various steel options and sizes. As a professional carbon steel bar supplier, Huaxiao Metal specializes in producing different types of carbon steel bars at competitive prices.

Type: Round Bar, Square Bar, Hexagon Bar, Flat Bar
Size Range: 6mm – 1000mm
Length: According to customer requirements
Process Hot-rolled / Cold-drawn / Forged
Standards JIS · EN · ASTM · GB
Delivery Time: 7-25 days

Carbon Steel Bar Specifications

Shape & Size Table

Shape	Hot-Rolled	Cold-Drawn	Forged	Common Diameters (mm)
Round Bar	25 – 600 mm	6 – 101.6 mm	200 – 1000 mm	6, 8, 10, 12, 16, 20, 25, 30, 40, 50, 60, 80, 100, 120, 150, 200, 250, 300+
Square Bar	21 – 54 mm	6 – 50.8 mm	—	6, 8, 10, 12, 16, 20, 25, 30, 35, 40, 50
Hexagonal Bar	—	9.5 – 65 mm	—	10, 12, 16, 20, 25, 30, 36, 46, 50, 55, 60, 65
Flat Bar	Thickness: 3 – 50 mm, Width: 10 – 300 mm		—	3×20, 5×25, 6×30, 8×40, 10×50, 12×60, 15×100, 20×150, 25×200, 30×300

Custom dimensions and non-standard shapes are available upon request. Contact our engineering team with your drawings or specifications for a feasibility assessment and quotation.

Which Shape Should You Choose?

Shape	Best For	Typical Applications
Round Bar	Rotating parts, symmetrical loading	Shafts, axles, bolts, pins, gears, hydraulic cylinders, pump components
Square Bar	Structural frames, flat-contact surfaces	Machine bases, structural supports, tool holders, key stock, fixture components
Hexagonal Bar	Fasteners, wrench-accessible parts	Bolts, nuts, fittings, couplings, valve stems, precision fasteners
Flat Bar	Structural load-bearing, wide contact	Brackets, stiffeners, base plates, framing members, machinery guards

At Huaxiao Metal, we strive to bring customers the best products and value-added services that exceed expectations, and we have received satisfactory comments from customers in the UK, Germany, Australia, UAE, and Brazil. Professional dedication and service have made us a leader in the carbon steel trading industry. Our wide selection of carbon steel bars can meet your different needs for all types of applications.

Technical Specifications

Parameter	Specification
Product Shapes	Round, Square, Hexagonal, Flat
Diameter / Size Range	6mm – 1000mm (varies by shape and process — see Shape & Size Table)
Length	3m, 5m, 6m, 9m, 12m standard; customizable
Manufacturing Process	Hot-rolled, Cold-drawn (Cold-finished), Forged
Tensile Strength	300 – 1,000+ MPa (grade-dependent)
Yield Strength	195 – 800 MPa (grade-dependent)
Elongation	5% – 35% (grade & diameter-dependent)
Hardness	120 – 300 HB (as-supplied); up to 65 HRC (heat-treated)
Surface Condition	Black (mill finish), Pickled/Oiled, Bright (cold-drawn), Peeled/Turned
Available Grades — EN	S235JR/J0/J2, S275JR/J0/J2/K2, S355JR/J0/J2/K2
Available Grades — GB	Q195, Q215, Q235, Q345, 20#, 45#, 65Mn
Available Grades — ASTM	A36, 1010, 1045, 1055, 1060, 1075, 1080, 1084, 1085, 1090, A105
Available Grades — JIS	SS400, S45C, S50C, SPHC/SPHD/SPHE
Applicable Standards	JIS G3101/G4051, EN 10025/10083, ASTM A36/A29/A108/A576, GB/T 699/700/1591/3077
Source Mills	Baosteel, Baotou Steel, Wuhan Iron and Steel (WISCO), Hegang Steel, Lianyuan Steel, Rizhao Steel, Lingyuan Steel
Inventory	~1,000 tons carbon steel products in year-round stock
Delivery Time	7-10 days (in-stock); 15-25 days (custom production)
Minimum Order Quantity	1 ton for standard sizes; 3-5 tons for custom specifications
Payment Terms	T/T (30% deposit, 70% before shipment), L/C at sight
Certification	ISO 9001, Mill Test Certificate (MTC) per shipment, SGS/BV inspection available

Looking Forward to Becoming One of Your Carbon Steel Bar Suppliers

Carbon Steel Bar Suppliers and Factory

Our company has nearly twenty years of export and production experience, and we provide a wide range of high-quality carbon steel bars for various applications. Our product range includes hot-rolled carbon steel bars and cold-rolled carbon steel bars. We have established long-term cooperative relationships with well-known steel mills such as Baosteel, Baotou Steel, Wuhan Iron and Steel, Hegang, Lianyuan Iron and Steel, Rizhao, Lingyuan, etc. to ensure that the carbon steel bars meet international standards.

Looking Forward to Becoming One of Your Carbon Steel Bar Suppliers

What Is Carbon Steel Bar?

A carbon steel bar is a solid, long-form steel product manufactured from carbon steel — an iron-carbon alloy with 0.02% to 2.1% carbon content. It is produced in four standard cross-sectional shapes — round, square, hexagonal, and flat — through three primary processes: hot rolling, cold drawing (cold finishing), and forging.

Carbon steel bars are classified by carbon content into:

Low-carbon bars (≤0.30% C): Also called mild steel bars. Highly ductile, excellent weldability. Tensile strength: 300–500 MPa. Grades: Q235, A36, S235JR, SS400, 1010.
Medium-carbon bars (0.30%–0.60% C): Balances strength (500–700 MPa) with machinability. Responds well to heat treatment. Grades: 1045, 45#, S45C, 1055.
High-carbon bars (0.60%–1.0% C): Maximum strength (700–1,000+ MPa) and wear resistance. Used for tools, dies, and high-stress components. Grades: 1060, 1075, 1080, 1090.
Rebar (reinforcing bar): Low-carbon steel with surface ribs for concrete bonding. Grades: HRB335, HRB400, HRB500 (GB standard).

At Huaxiao Metal, we source bar stock from China’s premier mills — Baosteel, Baotou Steel, Wuhan Iron and Steel, Hegang, Lianyuan Steel, Rizhao Steel, and Lingyuan Steel — processed through our ISO-certified Shanghai facility. With a standing carbon steel inventory of approximately 1,000 tons, we fulfill orders of all sizes with consistent quality.

Product Features of Carbon Steel Bar

Carbon steel bars possess several product features that make them desirable for various applications. Here are some key features of carbon steel bars:

1. Strength: Carbon steel bars offer high strength, making them suitable for structural applications and components that require load-bearing capabilities. The carbon content contributes to the steel’s strength and ability to withstand forces.
2. Durability: Carbon steel bars exhibit excellent durability and can withstand heavy usage, impacts, and harsh environmental conditions. They are resistant to wear and abrasion, making them suitable for applications where longevity is important.
3. Machinability: Carbon steel bars have good machinability, meaning they can be easily shaped, cut, and formed using various machining processes such as drilling, turning, milling, and grinding. This feature allows for precise fabrication and customization according to specific requirements.
4. Weldability: Carbon steel bars generally offer good weldability, allowing them to be easily joined or welded to other components or structures. This feature is important in applications where multiple pieces need to be connected or assembled.
5. Versatility: Carbon steel bars are available in a wide range of shapes, sizes, and grades, making them versatile for different applications. They can be found in round, square, flat, hexagonal, or other profiles, providing flexibility in design and usage.
6. Cost-Effectiveness: Carbon steel bars are typically more affordable compared to alloy steel or stainless steel bars, making them a cost-effective choice for many applications. Their availability and widespread use contribute to their competitive pricing.
7. Thermal Conductivity: Carbon steel bars have good thermal conductivity, allowing them to efficiently transfer heat. This feature is beneficial in applications where heat dissipation or thermal management is important, such as heat exchangers or cooling systems.
8. Corrosion Resistance: While carbon steel is not inherently corrosion-resistant like stainless steel, certain coatings or treatments can enhance its corrosion resistance. Additionally, proper maintenance and protective measures can help mitigate corrosion in carbon steel bars.

It’s important to note that the specific features and performance of carbon steel bars can vary depending on the specific grade, manufacturing process, and surface treatments applied.

Hot-Rolled vs Cold-Drawn vs Forged — What's the Difference?

Property	Hot-Rolled Carbon Steel Bar	Cold-Drawn Carbon Steel Bar	Forged Carbon Steel Bar
Surface Finish	Rough (mill scale present)	Smooth, bright finish	Moderate (scale removed)
Dimensional Tolerance	±0.4 – 1.0 mm	h9 – h11 (ISO), ±0.02 – 0.05 mm	±1.0 – 3.0 mm
Straightness	Standard	High precision	Moderate
Mechanical Strength	Moderate	Higher (work-hardened)	Highest (grain flow optimized)
Internal Soundness	Good	Good	Excellent (no porosity)
Size Range	25 – 600 mm	6 – 101.6 mm	200 – 1000 mm
Cost Level	Most economical	Moderate	Highest
Best For	Large structural components, general fabrication, where surface finish is not critical	Precision machining, tight-tolerance parts, fasteners, shafts requiring high surface quality	Critical high-stress components, large shafts, pressure vessel parts, oil & gas equipment

Looking Forward to Becoming One of Your Carbon Steel Bar Suppliers

Classification of Carbon Steel Bar

Carbon steel bars can be classified based on various factors such as their carbon content, manufacturing process, and intended use. Here are a few common classifications of carbon steel bars:

1. Low Carbon Steel Bars:

These bars contain a relatively low percentage of carbon, typically up to 0.30%. They are often referred to as mild steel bars and are known for their malleability, ductility, and ease of welding. Low-carbon steel bars are commonly used in construction, automotive components, and general-purpose applications.

2. Medium Carbon Steel Bars:

Medium carbon steel bars contain a carbon content ranging from 0.30% to 0.60%. They offer a balance between strength and ductility and are frequently used in applications that require higher strength, such as axles, shafts, and gears.

3. High Carbon Steel Bars:

High-carbon steel bars contain a higher carbon content, typically ranging from 0.60% to 1.0%. These bars exhibit excellent strength, hardness, and wear resistance. High carbon steel bars are often used in applications such as springs, cutting tools, and high-strength wires.

4. Alloy Steel Bars:

Alloy steel bars are carbon steel bars that are alloyed with other elements such as manganese, chromium, nickel, or molybdenum to enhance their properties. Alloy steel bars can offer improved strength, hardness, and corrosion resistance compared to plain carbon steel bars. They are commonly used in applications such as automotive parts, machinery components, and structural applications.

5. Rebar:

Reinforcing bars, commonly known as rebar, is a type of carbon steel bar used in reinforced concrete structures to provide tensile strength and stability. Rebars are typically made from low carbon steel and have deformations or ridges on their surface to enhance the bond with the concrete.

It’s important to note that these classifications are not exhaustive, and there may be other specific classifications or grades of carbon steel bars based on industry standards or specific requirements. The classification systems may vary depending on the country or organization setting the standards.

Carbon Steel Bar vs Alloy Steel Bar — Which Should You Choose?

Comparison Factor	Carbon Steel Bar	Alloy Steel Bar
Composition	Primarily Fe + C (0.02-2.1% C)	Fe + C + Cr, Ni, Mo, Mn, V, etc.
Cost	$ (Economical)	$$ – $$$ (1.5-2x higher)
Tensile Strength	300 – 1,000 MPa	600 – 1,500+ MPa
Hardenability	Limited depth	Deep hardening (full cross-section)
Wear Resistance	Good (high-C grades)	Excellent
High-Temp Performance	Degrades above 200°C	Maintains strength up to 500-600°C
Corrosion Resistance	Low (needs coating)	Moderate (Cr content helps)
Weldability	Excellent (low-C grades)	Moderate (preheat required)
Common Grades	A36, 1045, Q235, S235JR, 45#	4140, 4340, 8620, 5140
Best Applications	General structures, standard machinery, construction, cost-sensitive projects	High-stress gears, aircraft parts, oil-field equipment, high-temperature piping

For most construction, general machining, and standard industrial applications, carbon steel bars provide the optimal balance of performance and cost. When your application requires deep hardening, high-temperature strength, or extreme wear resistance, consider alloy steel bars.

Looking Forward to Becoming One of Your Carbon Steel Bar Suppliers

Carbon Steel Bar Dimensions

Carbon steel bars come in various dimensions, and their size can vary based on the specific type of bar and its intended application. The dimensions of carbon steel bars are typically specified in terms of diameter, width, and thickness, depending on the shape of the bar. Here are some common dimensions for different types of carbon steel bars:

1. Round Bars: Carbon steel round bars are cylindrical in shape and commonly available in the following diameter sizes: 6mm, 8mm, 10mm, 12mm, 16mm, 20mm, 25mm, 30mm, 35mm, 40mm, 50mm, 60mm, 70mm, 80mm, 90mm, 100mm, and larger.
2. Square Bars: Carbon steel square bars have equal width and thickness on all sides, and their dimensions are typically specified as width (or side length). Common square bar sizes include: 6mm, 8mm, 10mm, 12mm, 16mm, 20mm, 25mm, 30mm, 35mm, 40mm, 50mm, 60mm, 70mm, 80mm, 90mm, 100mm, and larger.
3. Flat Bars: Carbon steel flat bars have a rectangular cross-section with varying width and thickness dimensions. Common flat bar sizes include: thicknesses ranging from 3mm to 50mm, with widths typically ranging from 10mm to 300mm or more.
4. Hexagonal Bars: Hexagonal carbon steel bars have six sides and are measured across the flats (AF). Common hex bar sizes include 6mm AF, 8mm AF, 10mm AF, 12mm AF, 16mm AF, 20mm AF, 25mm AF, 30mm AF, and larger.

These dimensions are general guidelines and can vary depending on the specific manufacturer, region, and application requirements. It’s important to consult the manufacturer or supplier for precise dimensions and available sizes of carbon steel bars for your specific needs.

Industries & Applications

Industry	Applications	Recommended Shape	Common Grades
Construction	Structural frames, bridge reinforcement, building columns, foundation piles, concrete rebar	Round, Flat, Rebar	Q235, Q345, A36, S235JR, HRB400
Machinery Manufacturing	Shafts, gears, hydraulic rods, spindles, machine tool components, pump parts	Round, Hex	1045, 45#, S45C, Q345
Automotive	Axles, crankshafts, steering components, fasteners, suspension parts	Round, Hex, Flat	1045, 1055, S355JR, 45#
Shipbuilding	Propeller shafts, rudder stocks, structural stiffeners, deck machinery	Round, Flat, Forged	S355JR, A36, AH36
Mining & Heavy Equipment	Drill rods, crusher shafts, excavator pins, wear plates	Round, Flat	1060, 1075, 65Mn
Mold & Die Making	Die blocks, mold bases, punch holders, tooling plates	Flat, Square	1045, S50C, P20
Energy & Petrochemical	Pressure vessel components, piping flanges, valve bodies, heat exchanger parts	Round, Forged	S355J2, A105, 516Gr70

Looking Forward to Becoming One of Your Carbon Steel Bar Suppliers

Why Choose Us as Your Carbon Steel Bar Manufacturers and suppliers

When choosing a carbon steel bar manufacturer, you need to consider many factors, including product quality, price, delivery time, service, etc. The following are our advantages as a carbon steel bar manufacturer, which can be used as the basis for you to choose us:

15+ Years of Industry Experience

Established in 2010, Shanghai Huaxiao Metal has over 15 years of steel production and export experience. We serve 500+ clients across 30+ countries including the UK, Germany, Australia, UAE, Brazil, South Korea, and Colombia.

1,000+ Tons of Carbon Steel Inventory

With approximately 1,000 tons of carbon steel products maintained year-round, we deliver 7-10 day turnaround for in-stock orders — keeping your projects on schedule.

Direct Sourcing From Top Mills

We partner with China’s leading steel producers — Baosteel, Baotou Steel, Wuhan Iron and Steel, Hegang, Lianyuan Steel, Rizhao Steel, and Lingyuan Steel — providing full traceability and consistent quality.

International Quality Compliance

All products meet JIS, EN, ASTM, and GB standards. Our ISO 9001 certified quality system ensures every batch is tested. Mill Test Certificates and optional SGS/BV inspection available.

Factory-Direct Competitive Pricing

As a manufacturer, we eliminate middleman costs. Flexible payment terms: T/T (30% deposit, 70% before shipment) and L/C at sight.

Comprehensive Export Service

Our experienced export team manages documentation, logistics, customs clearance, and after-sales support. We provide 24-hour quotation response and regular production status updates.

To sum up, as a carbon steel bar manufacturer, we have advantages in product quality, price, delivery time, and after-sales service, and can provide customers with satisfactory products and services.

Looking Forward to Becoming One of Your Carbon Steel Bar Suppliers

Huaxiao Carbon Bar Export Package

All carbon steel bar shipments use seaworthy export packaging for safe long-distance ocean transport:

Round/Square/Hex Bars: Bundled with steel straps (1000-2000 kg per bundle), end caps applied, packed in wooden crates for larger diameters
Flat Bars: Stacked and strapped in bundles, separated by wooden spacers to prevent surface damage
Surface Protection: Anti-rust oil applied for bare (black) bars; pickled and oiled bars with additional VCI (Volatile Corrosion Inhibitor) wrapping
Labeling: Each bundle tagged with grade, heat number, dimensions, net weight, and bundle ID for easy identification at destination

Custom packaging — branded labeling, specific bundle weights, retail-ready packaging — is available on request. We ship on FOB Shanghai, CIF, and CFR terms to major ports worldwide.

Our company adopts standard export packaging. Most of our customers from the UK, South Korea, Colombia, the United Arab Emirates, and Australia often use this kind of packaging. If customers have other packaging requirements, as carbon steel coils suppliers, we will definitely meet your package requirements.

Welcome your inquiry! We will send you the carbon steel bar prices within 24 hours.

What Our Clients Say

"We've been sourcing 1045 round bars from Huaxiao Metal for our CNC machining shop. The cold-drawn tolerances are consistently within ±0.03mm, and the surface finish is excellent. Delivery has never been late in 3 years of cooperation."

"Huaxiao provided A36 and S235JR flat bars for our structural steel project. The material quality matched the mill certificates exactly, and the packaging arrived in perfect condition after sea freight. Reliable supplier."

FAQ About Carbon Steel Bars

What is carbon steel bar used for?

Carbon steel bars are used across construction, machinery, automotive, shipbuilding, mining, and tool-making industries. Round bars serve shafts, axles, and rotating parts. Square and flat bars provide structural framing and supports. Hexagonal bars are the standard for fasteners and fittings. Each shape and grade combination is matched to specific load, wear, and machinability requirements.

What shapes are available?

Huaxiao Metal supplies four primary shapes: round bars (6–1000mm), square bars (6–54mm), hexagonal bars (9.5–65mm), and flat bars (3–50mm thickness × 10–300mm width). Custom shapes and non-standard dimensions are available upon request.

What is the difference between hot-rolled, cold-drawn, and forged bars?

Hot-rolled bars are the most economical, with a rough surface and standard tolerances — best for structural and general applications.

Cold-drawn bars achieve tight tolerances (±0.02mm) and a smooth finish — ideal for precision machining and fasteners.

Forged bars offer the highest mechanical integrity with optimized grain structure — used for critical, high-stress components.

What grades do you supply?

We supply grades across EN, GB, ASTM, and JIS standards:

EN — S235JR, S275JR, S355JR;

GB — Q235, Q345, 45#;

ASTM — A36, 1045, 1060, 1080;

JIS — SS400, S45C.

For alloy steel bars, we also offer 4140, 4340, 8620, and 5140 grades.

What is the price range?

Pricing depends on shape, grade, size, process, order quantity, and market conditions. Round hot-rolled bars in common grades (e.g., Q235, A36) are the most economical. Cold-drawn, forged, and special-grade bars command higher prices. As a factory-direct supplier, we offer competitive pricing. Contact us for a detailed quotation — we respond within 24 hours.

How long is delivery?

Standard delivery is 7–25 days. In-stock items in common sizes typically ship within 7–10 days. Custom production orders require 15–25 days. We maintain approximately 1,000 tons of carbon steel inventory year-round for rapid fulfillment.

What is the MOQ?

The minimum order quantity is 1 ton for standard sizes and grades. Custom specifications may have an MOQ of 3–5 tons. We serve clients across the spectrum — from single-container buyers to large-scale industrial projects.

What standards does your bar comply with?

Our bars comply with JIS G3101/G4051, EN 10025/10083, ASTM A36/A29/A108/A576, and GB/T 699/700/1591/3077. A Mill Test Certificate (MTC) is provided with every shipment. Optional SGS or BV third-party inspection is available.

Can carbon steel bars be heat treated?

Yes. Medium-carbon (0.30–0.60% C) and high-carbon (>0.60% C) bars respond well to quenching and tempering, achieving 50–65 HRC surface hardness. Low-carbon bars can be case-hardened (carburized) for wear resistance while retaining a tough core. Common heat treatments include annealing, normalizing, and induction hardening.

What is the difference between carbon steel bar and alloy steel bar?

Carbon steel bars (Fe + C) offer good strength at lower cost and are ideal for general structural and machining applications.

Alloy steel bars (Fe + C + Cr, Ni, Mo, etc.) provide enhanced hardenability, wear resistance, and high-temperature performance. Choose carbon steel for cost-sensitive projects; choose alloy steel when your design demands deep hardening or extreme service conditions.