Products Description
Q345 Steel is a Chinese structural steel grade widely recognized for its versatility and strength in various engineering applications. Classified as a low-carbon alloy steel, Q345 is primarily composed of iron, with a carbon content typically ranging from 0.12% to 0.20%.
This low carbon content contributes to its excellent weldability and ductility, making it suitable for structural applications where high strength and toughness are required.
Chemical Composition
| Element (Symbol and Name) | Percentage Range (%) |
|---|---|
| C (Carbon) | 0.12 - 0.20 |
| Mn (Manganese) | 1.00 - 1.60 |
| Si (Silicon) | 0.30 - 0.60 |
| P (Phosphorus) | ≤ 0.045 |
| S (Sulfur) | ≤ 0.045 |
Mechanical Properties
| Property | Condition/Temper | Typical Value/Range (Metric - SI Units) | Typical Value/Range (Imperial Units) | Reference Standard for Test Method |
|---|---|---|---|---|
| Tensile Strength | Normalized | 490 - 610 MPa | 71 - 88 ksi | ASTM E8 |
| Yield Strength (0.2% offset) | Normalized | 345 MPa | 50 ksi | ASTM E8 |
| Elongation | Normalized | ≥ 21% | ≥ 21% | ASTM E8 |
| Hardness (Brinell) | Normalized | 160 - 210 HB | 160 - 210 HB | ASTM E10 |
| Impact Strength | -40°C | ≥ 27 J | ≥ 20 ft-lbf | ASTM E23 |
Products Description
| Corrosive Agent | Concentration (%) | Temperature (°C/°F) | Resistance Rating | Notes |
|---|---|---|---|---|
| Atmospheric | - | - | Fair | Susceptible to rust without protective coatings |
| Chlorides | 3-5 | 20-60 °C (68-140 °F) | Poor | Risk of pitting corrosion |
| Acids | 5-10 | 20-40 °C (68-104 °F) | Not Recommended | High susceptibility to corrosion |
| Alkalis | 10-20 | 20-60 °C (68-140 °F) | Fair | Moderate resistance, but protective measures recommended |
Typical Applications and End Uses
| Industry/Sector | Specific Application Example | Key Steel Properties Utilized in this Application | Reason for Selection (Brief) |
|---|---|---|---|
| Construction | Building frames | High strength, weldability | Structural integrity |
| Bridges | Bridge girders | Toughness, fatigue resistance | Load-bearing capacity |
| Machinery | Heavy machinery components | Ductility, impact resistance | Durability under stress |
| Automotive | Chassis parts | Formability, strength | Lightweight yet strong |
Other applications include:
* - Oil and gas pipelines
* - Shipbuilding
* - Heavy equipment manufacturing
Q345 steel is chosen for these applications due to its balance of strength, weldability, and cost-effectiveness, making it ideal for structural components that require reliable performance under load.
