Carbon steel is a widely used material that is vital to many industries due to its unique properties.
Some of the most common types of carbon steel include low-carbon steel, medium-carbon steel, high-carbon steel, and ultra-high carbon steel.
Mild steel has less than 0.25 wt.% carbon and cannot be hardened by heat treatment to form martensite.
Medium carbon steel contains 0.25 to 0.60 wt.% carbon and 0.60 to 1.65 wt.% manganese.
High-carbon steel contains 0.60 to 1.25 wt.% carbon and 0.30 to 0.90 wt.% manganese.
Carbon steel is the backbone of modern industry. From the skyscrapers that shape our cities to the cars we drive every day, its strength and versatility are unquestionable. But not all carbon steels are created equal. Selecting the right grade is critical to a project’s safety, longevity, and cost-effectiveness.
However, navigating the world of carbon steel grades—including names like low carbon, medium carbon, and high carbon, as well as specific codes like A36 or 1018—can be challenging.
This comprehensive guide aims to make that process easier. We’ll walk you through the different categories, compare their properties, and help you choose the best carbon steel grade for your specific application.
At Huaxiao Metal, we supply a full range of carbon steel grades in plates, coils, pipes, bars, and custom forms, supporting global industrial projects.
What Exactly is Carbon Steel?
At its core, carbon steel is an iron alloy where carbon is the main alloying element. While other elements like manganese and silicon are present in small quantities, it is the carbon content that primarily determines the steel’s properties.
A simple rule to remember is:
Higher Carbon Content = Higher Hardness & Strength, Lower Ductility & Weldability.
Lower Carbon Content = Higher Ductility & Weldability, Lower Hardness & Strength.
This trade-off is the key to understanding the three main categories of carbon steel.
Carbon Steel Grades Chart: The Most Popular Grades and Uses
Brief explanation of the importance of carbon steel in various industries.
Purpose of the chart: to provide a quick reference for common carbon steel grades and their applications.
Low-carbon steel Grades
Carbon Content: Typically 0.04% to 0.30%
This is the most common and widely used type of carbon steel. Its low carbon content makes it highly ductile, easy to weld, and simple to machine. While it doesn’t possess the high strength of other grades, its excellent formability and low cost make it a top choice for a vast range of applications.
Key Properties: Excellent weldability, high ductility, good impact strength, and low cost.
Common Applications: Structural beams (steel plates and shapes), automotive body panels, pipes, food cans, and everyday construction materials.
| Grade | Carbon Content | Common Uses |
|---|---|---|
| ASTM A36 | 0.26% – 0.29% | Structural applications, general fabrication |
| SAE 1008 | 0.10% max | Cold-formed components, automotive panels |
Medium Carbon Steel Grades
Carbon Content: Typically 0.31% to 0.60%
Medium-carbon steel strikes a balance between the ductility of low-carbon steel and the strength of high-carbon steel. The increased carbon content makes it stronger, harder, and more resistant to wear. It is often further strengthened through heat treatment processes like quenching and tempering.
Key Properties: Good balance of strength and ductility, good wear resistance, suitable for heat treatment.
Common Applications: Railway tracks, gears, crankshafts, axles, machinery parts, and high-pressure pipes.
| Grade | Carbon Content | Common Uses |
|---|---|---|
| AISI 1045 | 0.43% – 0.50% | Shafts, machinery parts, automotive components |
| EN 8 | 0.35% – 0.45% | Gears, studs, bolts |
High-Carbon Steel Grades
Carbon Content: Typically 0.61% to 1.50%
Known for its exceptional hardness and strength, high-carbon steel is the toughest of the three. This hardness, however, comes at the cost of ductility, making it brittle and difficult to weld, cut, or form. It is almost always hardened and tempered.
Key Properties: Very high strength, exceptional hardness, and wear resistance.
Common Applications: Cutting tools (drills, blades), high-strength springs, strong wires, and dies.
| Grade | Carbon Content | Common Uses |
|---|---|---|
| AISI 1095 | 0.90% – 1.03% | Springs, cutting tools, knives |
| EN 9 | 0.50% – 0.60% | High-stress components, axles |
Alloyed Carbon Steel Grades
| Grade | Alloying Elements | Common Uses |
|---|---|---|
| AISI 4140 | Chromium, Molybdenum | Shafts, gears, and automotive components |
| ASTM A572 | Vanadium, Columbium | Structural steel in construction |
Carbon Steel Grades Chart
| Grade | Carbon Content | Strength | Weldability | Typical Use |
|---|---|---|---|---|
| A36 | Low | Medium | Excellent | Structural steel |
| 1018 | Low | Medium | Excellent | Machining parts |
| 1045 | Medium | High | Moderate | Shafts, gears |
| 1095 | High | Very High | Poor | Springs, blades |
👉 This table is widely used as a quick decision reference for buyers and engineers.
Carbon Steel Grades Comparison
If you’re choosing between common grades, here is a practical comparison:
| Grade | Key Advantage | Limitation | Best Application |
|---|---|---|---|
| A36 | Low cost + easy welding | Lower strength | Construction |
| 1018 | Good machinability | Not very strong | Precision parts |
| 1045 | High strength | Harder to weld | Mechanical components |
| 1095 | High hardness | Brittle | Cutting tools |
How to Choose
For structural projects → Choose A36
For machining → Choose 1018
For strength & mechanical parts → Choose 1045
For wear resistance / tools → Choose 1095
👉 This is the core decision logic used by procurement teams
Carbon Steel Grades by Carbon Content: A Quick Comparison Chart
| Grade Type | Carbon Content | Popular Grades | Key Properties | Common Applications |
| Low Carbon | 0.04% – 0.30% | ASTM A36, AISI 1018 | Easy to weld, highly ductile | Structural beams, car bodies, pipes |
| Medium Carbon | 0.31% – 0.60% | AISI 1045, EN8 | Balanced strength & wear resistance | Gears, axles, railway tracks |
| High Carbon | 0.61% – 1.50% | AISI 1095, EN9 | Extreme hardness, brittle | Cutting tools, high-strength wires |
Need to source high-quality carbon steel for your project? Huaxiao Metal provides a full range of certified carbon steel products.
Learn More About Common Carbon Steel Grades
Beyond the general categories, specific grades are designated by standards organizations like ASTM and AISI. Here are a few of the most common ones you’ll encounter:
ASTM A36 Steel
A classic example of low-carbon steel, A36 is arguably the most common structural steel in the world. It offers good strength combined with excellent formability and weldability, making it a reliable and cost-effective choice for general construction.
Common Uses: Building frames, bridges, platforms, and manufacturing structural steel plates.
AISI 1018 Steel
AISI 1018 is another popular mild/low-carbon steel that provides a good balance of toughness, strength, and ductility. It is well-suited for machining and forming processes and offers excellent weldability.
Common Uses: Shafts, spindles, pins, rods, and other machine parts that don’t require extreme strength.
AISI 1045 Steel
This is a popular grade of medium-carbon steel. It offers higher strength and hardness than the 1018 grade and responds very well to heat treatment. It’s an excellent choice for parts that need to withstand more wear and tear.
Common Uses: Gears, axles, bolts, studs, and parts requiring higher strength and impact resistance.
Carbon Steel Grades vs International Standards
For global buyers, equivalent grades are critical:
| China (GB) | USA (ASTM/AISI) | Europe (EN) |
|---|---|---|
| Q235 | A36 | S235 |
| 20# | 1020 | C22 |
| 45# | 1045 | C45 |
👉 This helps international procurement teams source locally equivalent materials
Carbon Steel Grades Price Comparison
| Grade | Price Level | Reason |
|---|---|---|
| A36 | Low | Simple composition |
| 1018 | Low-Medium | Better machining |
| 1045 | Medium | Higher strength |
| 1095 | High | High carbon content |
👉 Prices vary based on size, quantity, and processing requirements
How to Choose the Right Carbon Steel Grades for Your Project
To make the right choice, ask yourself these four key questions:
What Mechanical Properties Are Required? Do you need extreme strength and hardness (high-carbon), or is it more important for the material to be ductile and easy to form (low-carbon)?
Will It Be Welded? If your project involves significant welding, low-carbon steel like A36 or 1018 is your best and safest option.
Does It Need to Be Machined? While all carbon steels can be machined, low-carbon grades are generally easier to work with, extending tool life.
What Are the Environmental Conditions? Remember that carbon steel is susceptible to rust. If it will be exposed to moisture, you must plan for a protective coating like paint or galvanization.
Carbon Steel Grades For Sale From China Carbon Steel Suppliers
1010 Steel
1010 Steel (UNS G10100) – Supplier, Manufacturer & Price – Huaxiao Metal 1010 Carbon Steel is a widely used low-carbon steel known for its excellent
1008 Steel
1008 Steel Supplier & Manufacturer – Premium Low Carbon Steel from Huaxiao Metal Huaxiao Metal is a professional AISI 1008 steel supplier and manufacturer, providing
1075 Steel
AISI 1075 Steel Suppliers and Manufacturer – Huaxiao Metal Huaxiao Metal is a reliable (UNS G10750) 1075 steel supplier and manufacturer, providing stable quality plate,
Q345 Steel
Material Q345 Steel Suppliers and Manufacturer Huaxiao Metal is a renowned name in the metal manufacturing and export industry, boasting over a decade of expertise
1060 Steel
AISI 1060 Steel Suppliers and Manufacturer AISI 1060 carbon steel is a medium-to-high carbon steel with a carbon content of approximately 0.60%. Compared to medium
A36 Carbon Steel
A36 Carbon Steel Suppliers and Manufacturer A36 grade carbon steel is easy to weld, form, and machine. They have a good strength-to-weight ratio and are
5160 Steel
AISI 5160 Steel Suppliers and Manufacturer 5160 Steel (also known as AISI 5160 or ASTM 5160) is a high-carbon chromium alloy steel widely used for
1095 Steel
AISI 1095 Steel Suppliers and Manufacturer 1095 steel is a high-carbon alloy known for its exceptional hardness (HRC 55-62 after tempering) and edge retention. As
1080 Steel
AISI 1080 Steel Supplier & Manufacturer | Huaxiao Metal Trusted AISI 1080 Steel Supplier and Manufacturer – Huaxiao Metal 1080 Carbon Steel (UNS G10800) is
1018 Steel
AISI 1018 Steel Suppliers and Manufacturer Are you looking for a low-carbon steel that combines exceptional weldability with superior surface finish? AISI 1018 carbon steel
1040 Steel
1040 Steel Supplier – Medium Carbon Steel (AISI 1040) Bar, Plate & Sheet | Huaxiao Metal 1040 steel is a medium carbon steel widely used
1045 Steel
AISI 1045 Steel Suppliers – Steel Bars, Plates & Tubes – In Stock – Huaxiao Metal Huaxiao Metal is a leading AISI 1045 steel supplier
4140 Steel
4140 Steel Supplier – 42CrMo / SCM440 Alloy Steel Bar, Plate & Sheet | Huaxiao Metal Huaxiao Metal is a professional 4140 steel supplier and
Why Choosing the Right Grade Matters
Selecting the wrong carbon steel grade can lead to:
- Structural failure
- Increased machining costs
- Welding issues
- Shorter product lifespan
👉 That’s why professional supplier support is critical.
Key Factors Affecting Carbon Steel Prices
Understanding price drivers helps you time your procurement. In 2026, four pillars dictate the market:
Raw Materials: The cost of iron ore and coking coal remains the primary baseline for pricing.
Energy & Carbon Taxes: New regulations like CBAM and the shift to “Green Steel” (hydrogen-based) have introduced a cost premium on carbon-intensive grades.
Global Demand: Infrastructure projects in Southeast Asia and the EV manufacturing boom are the current strongest demand drivers.
Logistics: Freight rates and regional trade tariffs directly impact the “landed cost” of imported steel.
Why Choose Huaxiao Metal
At Huaxiao Metal, we are a trusted global supplier of carbon steel materials.
Full Product Range
- Plates / Sheets / Coils
- Pipes & Tubes
- Bars & Rods
Wide Grade Availability
- A36 / 1018 / 1045 / 1095
- ASTM / EN / JIS / GB standards
Export Experience
- Serving clients in Europe, Middle East, South America
Quality Assurance
- Mill Test Certificate (EN 10204 3.1)
- Third-party inspection available
Flexible Supply
- Custom cutting
- Fast delivery
- Competitive pricing
Looking for a reliable carbon steel supplier?
Huaxiao Metal provides high-quality carbon steel products with competitive pricing and global delivery.
👉 Contact us today for:
- Latest price
- Stock availability
- Technical support
FAQ – Carbon Steel Grades
What is the most common grade of carbon steel?
ASTM A36 is the most common low-carbon structural steel grade globally due to its versatility, weldability, and low cost.
Is Q235 equivalent to A36?
Yes, Q235 is generally comparable to ASTM A36 in strength and application.
Is 45# the same as 1045?
Yes, 45# is the Chinese equivalent of AISI 1045 medium carbon steel.
Which grade is best for bridge construction?
Q345 / S355 / A572 Gr50 are commonly used due to higher strength.
What is the most cost-effective structural steel?
Q235 is typically the most economical structural grade.
Can carbon steel be used for outdoor construction?
Yes, but since it lacks the chromium of stainless steel, it is prone to rust. We recommend using Galvanized Carbon Steel or Weathering Steel (Corten) for outdoor applications.
Does carbon steel rust?
Yes. The iron in carbon steel oxidizes when exposed to oxygen and moisture, creating iron oxide (rust). To prevent this, carbon steel parts must be protected with paint, galvanization, or another surface coating.
What standards do you supply for carbon steel?
We supply carbon steel that meets a wide range of international standards, including ASTM, AISI, SAE, EN, DIN, and JIS, ensuring you receive material that complies with your project’s requirements.
What is the main difference between carbon steel and stainless steel?
The key difference is the presence of chromium. Stainless steel contains at least 10.5% chromium, which creates a passive, corrosion-resistant layer on its surface. Carbon steel does not have this layer and will rust if not protected.
What is the strongest carbon steel grade?
High carbon steels like 1095 offer the highest hardness and strength.
What is the difference between 1018 and 1045 steel?
1018 has better machinability, while 1045 provides higher strength.
1018 vs 1045 Steel: The Ultimate Comparison for Engineers & Buyers
Which carbon steel grade is best for machining?
1018 is commonly used due to its excellent machinability and surface finish.
Which carbon steel grade is cheapest?
A36 is typically the most cost-effective option for structural use.
Is A36 stronger than 1018?
A36 generally has slightly higher strength, but 1018 offers better machining properties.
Does Carbon Steel Rust?
Carbon steel is a common alloy steel consisting of carbon and iron. Due to its excellent mechanical properties and low cost, carbon steel is widely
Carbon Steel vs Stainless Steel: Which Is Better for Industrial Applications? (2026 Guide)
When choosing between carbon steel vs stainless steel, buyers often compare strength, corrosion resistance, cost, and long-term performance. Understanding the differences between these two materials
Conclusion
Carbon steel grades vary significantly in strength, application, and cost. Selecting the correct grade ensures structural safety, cost efficiency, and long-term durability.
If you are sourcing bulk carbon steel or need technical guidance on grade selection, Huaxiao Metal’s team can support your project with global standard materials and competitive pricing.
👉 Contact us today for updated carbon steel prices and technical consultation.
