Q370q Series | Structural Steel for Bridge
Q370q Series | Structural Steel for Bridge
SteelPRO Group provides Q370q series structural steel plates for bridges in stock.
Standards: ISO, ASTM/ASME/AISI, EN, GB/T, DIN, JIS, BS, etc.
Grades: Q370qD/E, Q345qDNH/ENH
Material: High-Strength Low-Alloy Steel (HSLA)
Thickness: 6-100 mm, or customized
Width: 900-4800 mm, or customized
Length: 3000-25000 mm, or customized
Shape: Plate, Profile (I-beam, H-beam, Angle, Channel, Square bar, Flat bar), Pipe, Coil, Bar, or as request
Condition of Delivery: N/HR/A/T/Q+T/TMCP, or as request
Stock: In stock
Origin: Hebei/Henan/Jiangsu, China
Port: Qingdao
Description
What Is Q370q?
Q370q series steel is high-strength low-alloy structural steel designed for bridge construction. It primarily consists of carbon, manganese, silicon, and other micro-alloying elements to enhance performance.
Naming Rules:
- Q: Yield strength.
- 370: Minimum yield strength of 370 MPa.
- q: Suitable for bridge structure.
- C/D/E/F: Quality grades. Toughness at 0℃/-20℃/-40℃/-60℃. (e.g. Q370qD)
- NH: Weather-resistant, designed to withstand atmospheric corrosion. (e.g. Q370qDNH)
- Z-: Z-direction performance grade, such as Z15, Z25. (e.g. Q370qDNHZ15)
Q370q series steel offers high strength, excellent toughness, and weldability, with strong impact, fatigue, and low-temperature resistance. It is widely used in critical bridge components, including beams, trusses, and decks, ensuring durability and load-bearing capacity under harsh conditions.
Characteristics of Q370q Series Steel
- High strength and toughness
- Good weldability and machinability
- Resistant to atmospheric corrosion
- Suitable for low-temperature environments
- Used in heavy structures like bridges and ships
Chemical Compositions
Element | Q370qD (%) | Q370qE (%) |
---|---|---|
Carbon (C) | ≤ 0.14 | ≤ 0.14 |
Silicon (Si) | ≤ 0.55 | ≤ 0.55 |
Manganese (Mn) | ≥ 1.00 – ≤ 1.60 | ≥ 1.00 – ≤ 1.60 |
Phosphorus (P) | ≤ 0.025 | ≤ 0.020 |
Sulfur (S) | ≤ 0.020 | ≤ 0.010 |
Chromium (Cr) | ≤ 0.30 | ≤ 0.30 |
Nickel (Ni) | ≤ 0.30 | ≤ 0.30 |
Copper (Cu) | ≤ 0.30 | ≤ 0.30 |
Nitrogen (N) | ≤ 0.008 | ≤ 0.008 |
Titanium (Ti) | 0.006 – 0.030 | 0.006 – 0.030 |
Vanadium (V) | 0.010 – 0.080 | 0.010 – 0.080 |
Niobium (Nb) | 0.010 – 0.090 | 0.010 – 0.090 |
Boron (B) | ≤ 0.0005 | ≤ 0.0005 |
Aluminum (Al) | 0.010 – 0.045 | 0.010 – 0.045 |
Hydrogen (H) | ≤ 0.0002 | ≤ 0.0002 |
Note:
- According to standard GB/T 714-2015.
- Al, Nb, V, and Ti can be added individually or in combination. If combined, at least one element must meet the table’s minimum limit, and the total of Nb + V + Ti ≤ 0.22%.
- Total aluminum content must be 0.015% – 0.050%.
- By mutual agreement, Mn content can be increased to 2.00%.
- Analysis of B and H can be skipped if their residue in steel is guaranteed by the supplier.
Physical Properties
Property | Metric | Imperial |
---|---|---|
Density | 7.85 g/cm³ | 490.5 lb/ft³ |
Melting Point | 1450°C | 2642°F |
Thermal Conductivity | 48 W/m·K | 27.7 BTU/(hr·ft·°F) |
Electrical Conductivity | 6.99 MS/m | 6.99 MS/m |
Specific Heat Capacity | 486 J/(kg·K) | 0.116 BTU/(lb·°F) |
Thermal Expansion Coefficient | 12 × 10⁻⁶ /K | 6.7 × 10⁻⁶ /°F |
Electrical Resistivity | 143 nΩ·m | 143 nΩ·m |
Mechanical Properties
Thickness (mm) | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation (%) | Impact Temperature (°C) | Impact Energy (Akv J) |
---|---|---|---|---|---|
≤50 | ≥370 | ≥510 | ≥20 | -20/-40 (Q370qD/Q370qE) | ≥41 (longitudinal) |
50-100 | ≥360 | ≥510 | ≥20 | -20/-40 (Q370qD/Q370qE) | ≥41 (longitudinal) |
Industries & Applications
Industry | Application |
---|---|
Construction | Bridges, Overpasses, Steel Structures, Railings |
Shipbuilding | Deck Plates, Hull Structures, Bulkheads, Support Beams |
Energy & Power | Wind Turbine Towers, Oil Platforms, Power Poles, Transmission Towers |
Transportation | Railway Tracks, Train Frames, Crane Beams, Highway Guardrails |
Heavy Machinery | Excavator Arms, Loader Frames, Crane Booms, Forklift Components |
Machining
Heat Treatment
- Normalizing: Heat to 880–920°C, then air cool.
- Annealing: Heat to 750–800°C, hold, then slow furnace cool.
- Quenching: Heat to 850–880°C, quench in water or oil.
- Tempering: Reheat to 500–600°C, hold, then air cool.
Surface Finish
- Shot blasting: Removes rust and scale, improving surface adhesion.
- Pickling: Uses acid to clean the surface and remove oxides.
- Galvanizing: Coats with a protective zinc layer to prevent corrosion.
- Painting/Coating: Adds protective or decorative layers.
- Phosphating: Prepares surface for further coating and enhances corrosion resistance.
- Polishing: Smoothens the surface to improve aesthetics and reduce friction.
*Customization is available upon request.
Our Service
SteelPRO Group – manufacturer and solution provider for special steel, offering multi-industry application solutions and customised services, 100% quality free, accompanying customers in their growth!
Our Quality Control
- Roundness
- Tolerance
- Microstructure
- Non-Destructive Testing
- Destructive Testing
- Process Control
Service Integration Processing
- Welding
- Metal Fabrication
- CNC Machining
- Lathe
- Forming
QUESTION 1
QUESTION 2
QUESTION 3
QUESTION 4
QUESTION 4
CONTACT
CONTACT
Certifications
Other Products
-
-
SteelPRO Group offers FH550 high-strength structural steel plates for shipbuilding....
-
SteelPRO Group offers DH550 high-strength shipbuilding steel plates in stock....
-
SteelPro Group offers FH36 high-strength steel for shipbuilding. It has...