Overview
Q215 Carbon Steel is a low-carbon structural steel grade specified under GB/T 700, offering a balance of good strength, excellent weldability, and superior formability. It is positioned between Q195 and Q235 in terms of mechanical performance and is widely used in structural fabrication, sheet metal manufacturing, welded assemblies, machinery components, and general engineering applications.
Q215 is available in two grades:
- Q215A
- Q215B
Among them, Q215B provides stricter control of sulfur and phosphorus content, resulting in improved weldability and mechanical reliability.
Compared with Q195, Q215 offers higher strength while maintaining excellent processing characteristics. Compared with Q235, it provides better ductility but lower structural strength.
Material Specification
| Property | Value |
|---|---|
| Material Designation | Q215 |
| Standard | GB/T 700 |
| Material Family | Low Carbon Structural Steel |
| Density | 7.85 g/cm³ |
| Magnetic Property | Magnetic |
| Standard Forms | Sheet, Plate, Coil, Pipe, Tube, Bar, Wire Rod |
Chemical Composition
Q215A
| Element | Content (%) |
|---|---|
| Carbon (C) | ≤0.15 |
| Manganese (Mn) | ≤0.55 |
| Silicon (Si) | ≤0.30 |
| Sulfur (S) | ≤0.050 |
| Phosphorus (P) | ≤0.045 |
| Iron (Fe) | Balance |
Q215B
| Element | Content (%) |
|---|---|
| Carbon (C) | ≤0.15 |
| Manganese (Mn) | ≤0.55 |
| Silicon (Si) | ≤0.30 |
| Sulfur (S) | ≤0.045 |
| Phosphorus (P) | ≤0.045 |
| Iron (Fe) | Balance |
Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | 335–450 MPa |
| Yield Strength | ≥215 MPa |
| Elongation | ≥31% |
| Hardness | ≤125 HB |
| Elastic Modulus | 200 GPa |
Strength Comparison
| Material | Yield Strength |
|---|---|
| Q195 | 195 MPa |
| Q215 | 215 MPa |
| Q235 | 235 MPa |
| Q345 | 345 MPa |
Physical Properties
| Property | Value |
|---|---|
| Density | 7.85 g/cm³ |
| Melting Point | 1460–1520°C |
| Thermal Conductivity | 50 W/m·K |
| Electrical Resistivity | 0.16 μΩ·m |
| Thermal Expansion Coefficient | 11.8 × 10⁻⁶/K |
| Specific Heat Capacity | 486 J/kg·K |
Corrosion Resistance
| Environment | Performance |
|---|---|
| Indoor Environment | Moderate |
| Dry Atmosphere | Good |
| Industrial Environment | Poor |
| Humid Environment | Poor |
| Outdoor Exposure | Poor |
| Marine Environment | Very Poor |
Like other carbon steels, Q215 requires protective surface treatment when used outdoors.
Common protective treatments include:
- Hot-Dip Galvanizing
- Electro Galvanizing
- Powder Coating
- Painting
- Zinc Plating
- E-Coating
Weldability
| Welding Process | Rating |
|---|---|
| MIG Welding | Excellent |
| TIG Welding | Excellent |
| Arc Welding | Excellent |
| Spot Welding | Excellent |
| Resistance Welding | Excellent |
The low carbon content minimizes heat-affected zone cracking and allows excellent welding performance.
International Equivalent Grades
| Standard | Equivalent Grade |
|---|---|
| GB/T (China) | Q215 |
| ASTM (USA) | SAE 1012 / SAE 1015 |
| JIS (Japan) | SPHC |
| EN (Europe) | S215JR |
| DIN (Germany) | St33 |
| ISO | E215 |
Available Forms
| Product Type | Availability |
|---|---|
| Hot Rolled Sheet | Yes |
| Cold Rolled Sheet | Yes |
| Steel Plate | Yes |
| Steel Coil | Yes |
| Wire Rod | Yes |
| Welded Pipe | Yes |
| Structural Profiles | Yes |
Typical Applications
Sheet Metal Fabrication
- Electrical Cabinets
- Control Boxes
- Machine Covers
- Brackets
- Chassis
Structural Fabrication
- Light Steel Structures
- Frames
- Supports
- Mounting Components
Machinery Manufacturing
- Equipment Bases
- Machine Guards
- Mechanical Frames
- Fabricated Assemblies
Construction Industry
- Building Accessories
- Reinforcement Parts
- Structural Connectors
- Support Components
Appliance Industry
- Washing Machine Parts
- Refrigerator Components
- Air Conditioner Housings
- Home Appliance Frames
Hardware Industry
- Hinges
- Clamps
- Fasteners
- Furniture Hardware
Manufacturing Characteristics
| Manufacturing Process | Rating |
|---|---|
| Laser Cutting | Excellent |
| CNC Punching | Excellent |
| Stamping | Excellent |
| Deep Drawing | Excellent |
| Bending | Excellent |
| Roll Forming | Excellent |
| Welding | Outstanding |
| Powder Coating | Excellent |
| Galvanizing | Excellent |
Advantages
Higher Strength Than Q195
Provides improved load-bearing capability.
Excellent Formability
Suitable for bending, forming, and stamping.
Outstanding Weldability
Compatible with all common welding methods.
Cost Effective
Offers excellent value for general fabrication.
Easy Surface Finishing
Supports plating, coating, and galvanizing.
Widely Available
Commonly stocked worldwide.
Limitations
Lower Strength Than Q235
Not ideal for heavy structural applications.
Poor Corrosion Resistance
Requires protective coatings for outdoor use.
Not Heat Treatable
Cannot achieve significant strength improvement through heat treatment.
Limited Wear Resistance
Not suitable for high-friction applications.
Comparison with Other Carbon Steels
| Property | Q215 | Q195 | Q235 | Q345 |
|---|---|---|---|---|
| Yield Strength | 215 MPa | 195 MPa | 235 MPa | 345 MPa |
| Formability | Excellent | Outstanding | Excellent | Good |
| Weldability | Excellent | Excellent | Excellent | Excellent |
| Cost | Low | Lowest | Low | Medium |
| Structural Capacity | Moderate | Low | Good | High |
Comparison with Engineering Materials
| Material | Yield Strength | Corrosion Resistance | Cost |
|---|---|---|---|
| Q215 | 215 MPa | Poor | Low |
| Q235 | 235 MPa | Poor | Low |
| Q345 | 345 MPa | Poor | Medium |
| SS304 | 205 MPa | Excellent | High |
| Aluminum 5052 | 193 MPa | Excellent | High |
| Galvanized Steel | 215 MPa | Good | Medium |
Available Surface Finishes
Raw Finishes
- Hot Rolled Finish
- Cold Rolled Finish
- Pickled Finish
Protective Finishes
- Hot-Dip Galvanizing
- Electro Galvanizing
- Zinc Plating
- Nickel Plating
- Chrome Plating
Decorative Finishes
- Powder Coating
- Spray Painting
- Electrophoretic Coating (E-Coating)
- Silk Screen Printing
Frequently Asked Questions (FAQ)
What is Q215 steel?
Q215 is a low-carbon structural steel under GB/T 700 offering improved strength over Q195 while maintaining excellent weldability and formability.
What is Q215 used for?
Typical applications include:
- Sheet Metal Parts
- Structural Frames
- Machinery Components
- Electrical Cabinets
- Appliance Components
- Welded Assemblies
What is the difference between Q215 and Q195?
| Property | Q215 | Q195 |
|---|---|---|
| Yield Strength | 215 MPa | 195 MPa |
| Tensile Strength | Higher | Lower |
| Structural Capacity | Better | Lower |
| Formability | Excellent | Outstanding |
What is the difference between Q215 and Q235?
| Property | Q215 | Q235 |
|---|---|---|
| Yield Strength | 215 MPa | 235 MPa |
| Formability | Better | Slightly Lower |
| Structural Use | Moderate | More Common |
Is Q215 easy to weld?
Yes. Q215 provides excellent weldability and is suitable for MIG, TIG, spot welding, and arc welding.
Can Q215 be galvanized?
Yes. Hot-dip galvanizing and electro-galvanizing are commonly applied to improve corrosion resistance.
Is Q215 suitable for outdoor use?
Only when protective coatings such as galvanizing or powder coating are applied.
Is Q215 equivalent to SAE 1015?
Generally yes. Q215 is similar to SAE 1012–1015 low-carbon steel grades.
Why is Q215 widely used in fabrication?
Because it combines:
- Good Strength
- Excellent Weldability
- Excellent Formability
- Low Cost
making it ideal for fabricated industrial products.
Does GCNOV provide custom manufacturing services for Q215?
Yes. GCNOV provides:
- Laser Cutting
- CNC Punching
- Sheet Metal Fabrication
- Stamping
- Deep Drawing
- Welding
- Powder Coating
- Galvanizing
- Prototype Development
- Low-Volume Production
- Mass Production