CS Type A/B/C Steel Grades
Versatile Hot-Rolled Carbon Steel for Forming, Welding, and Structural Applications
- Technical Support
CS Type A/B/C Steel Technical Specifications & Applications
CS Type A, B, and C are hot-rolled commercial steel grades under ASTM A1011, designed for versatile manufacturing and structural applications. These steels are defined primarily by chemical composition, providing a balance of strength, formability, and weldability for general-purpose use.
CS Type A offers superior formability and weldability, ideal for deep drawing, bending, and precision fabrication. It is commonly used in automotive panels, appliance components, and light structural parts.
CS Type B features slightly higher carbon content than Type A, delivering moderate strength suitable for structural components, general fabrication, and applications where surface finish is less critical.
CS Type C has the highest carbon content of the three, providing increased strength and hardness for demanding structural or industrial components requiring enhanced wear resistance.
All CS grades are compatible with standard fabrication processes, including cutting, bending, stamping, and welding. Their versatility and reliable performance make them widely used across construction, automotive, appliance manufacturing, and industrial applications.
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Table of Contents
1. Typical Uses & Selection Guidance
- Structural Applications
CS Type A, B, and C are ASTM A1011 hot-rolled commercial steel grades widely used for general-purpose and structural applications. Defined by chemical composition, these steels offer a reliable balance of strength, weldability, and formability.
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CS Type A: Excellent formability and weldability, ideal for deep drawing, bending, and precision fabrication. Common in automotive panels, appliance parts, and light structural components.
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CS Type B: Slightly higher carbon content, providing moderate strength for structural components and general fabrication where surface finish is less critical.
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CS Type C: Highest carbon content, offering increased strength and hardness for demanding structural and industrial components.
These grades are versatile for cutting, bending, stamping, and welding, making them suitable for construction, automotive, appliance, and industrial applications.
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- Corrosion Protection
CS grades A, B, and C are not naturally corrosion-resistant but can be galvanized or coated to enhance durability. Zinc or aluminum-zinc coatings provide long-term protection against rust and oxidation, maintaining a smooth surface suitable for painting or further processing.
- Forming Advantages
CS Type A, B, and C steels offer excellent formability, dimensional accuracy, and minimal springback, supporting the production of complex shapes. Their consistent mechanical properties and weldability ensure reliable performance across automotive, structural, appliance, and industrial applications.
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2. Technical Specifications Table
1. Chemical Composition Requirements (Maximum %)
| Steel Grade | Carbon (C) | Silicon (Si) | Manganese (Mn) | Phosphorus (P) | Sulfur (S) | Titanium (Ti) |
|---|---|---|---|---|---|---|
| CS Type A | ≤ 0.10% | ≤ 0.03% | ≤ 0.60% | ≤ 0.03% | ≤ 0.035% | Not specified |
| CS Type B | 0.02%–0.15% | ≤ 0.03% | ≤ 0.60% | ≤ 0.03% | ≤ 0.035% | Not specified |
| CS Type C | ≤ 0.15% | ≤ 0.03% | ≤ 0.60% | ≤ 0.03% | ≤ 0.035% | Not specified |
2. Mechanical Property Requirements (Maximum Values)
| Steel Grade | Min. Yield Strength (MPa) | Min. Tensile Strength (MPa) | Min. Elongation (%) | Bend Angle (°) | Mandrel Diameter (× Thickness t) |
|---|---|---|---|---|---|
| CS Type A | 205–275 | 340–480 | ≥ 30 | 180° | ≥ 4t |
| CS Type B | 275–345 | 420–520 | ≥ 30 | 180° | ≥ 4t |
| CS Type C | 345–420 | 520–590 | ≥ 30 | 180° | ≥ 4t |
3. Mechanical Properties
| Steel Grade | Min. Yield Strength (MPa) | Min. Tensile Strength (MPa) | Min. Elongation (%) | Bend Angle (°) | Mandrel Diameter (× Thickness t) |
|---|---|---|---|---|---|
| CS Type A | 205–275 | 340–480 | ≥ 30 | 180° | ≥ 4t |
| CS Type B | 275–345 | 420–520 | ≥ 30 | 180° | ≥ 4t |
| CS Type C | 345–420 | 520–590 | ≥ 30 | 180° | ≥ 4t |
4. Applicable Hot-Dip Metallic Coating Types
| Coating Class | Composition (%) | Key Features |
|---|---|---|
| Z (Zinc) | ≥99% Zinc | Provides basic corrosion protection; suitable for general applications with CS grades A, B, and C. |
| ZA (Zinc-Aluminium) | 95% Zn, 5% Al | Offers improved corrosion resistance over pure zinc; ideal for moderate environmental exposure. |
| ZF (Zinc-Iron) | Zinc with iron alloy | Enhances surface hardness and wear resistance; suitable for structural and industrial components. |
| ZM (Zinc-Magnesium) | Zn with 2–4% Mg, 5–13% Al | Delivers superior corrosion resistance in harsh environments; compatible with all CS grades. |
| AZ (Aluminium-Zinc) | 55% Al, 43.5% Zn, 1.5% Si | Excellent corrosion resistance and heat reflectivity; ideal for coated CS Type A/B/C steel applications. |
| AM (Aluminium-Magnesium) | Al with Mg alloy | High corrosion resistance and heat tolerance; suitable for high-temperature and outdoor applications. |
3. CS Type A/B/C vs FS — What’s the Difference?
| Steel Grade | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation (%) | Bendability |
|---|---|---|---|---|
| CS Type A | ≥205 | ≥340 | ≥30 | 180° with 4t mandrel |
| CS Type B | ≥275 | ≥420 | ≥30 | 180° with 4t mandrel |
| CS Type C | ≥345 | ≥520 | ≥30 | 180° with 4t mandrel |
| FS | ≥220 | 300–440 | ≥20 | 180° with 6t mandrel |
CS Type A/B/C Steel FAQ：
ASTM A1011 CS Grades A, B, and C are hot-rolled carbon steels primarily used for forming and welding. Defined by chemical composition, these steels are versatile for structural, automotive, appliance, and industrial applications.
CS Type A: Excellent formability and weldability, ideal for deep drawing, bending, and precision fabrication.
CS Type B: Moderate strength and good formability, suitable for structural components and machinery parts.
CS Type C: High strength and hardness, suitable for demanding structural and industrial applications.
CS Type A: Automotive panels, appliance components, light structural parts.
CS Type B: Machinery parts, agricultural equipment, general structural components.
CS Type C: Construction, heavy-duty industrial equipment, structural components requiring high load-bearing capacity.
Yes. CS grades A, B, and C can be hot-dip galvanized or coated to enhance corrosion resistance, complying with ASTM A653 standards for zinc or zinc-iron alloy coatings.
FS grades are designed for more severe forming operations and typically offer higher strength and hardness. CS grades are ideal for general forming, welding, and light structural applications.
They offer excellent formability, weldability, and cost-effective solutions for various industrial and structural applications where surface finish is not critical.
These steels are not suitable for high-strength or heavy-wear applications. For such needs, higher-strength or alloy steels are recommended.
