Q690D steel plate is a high-strength low-alloy (HSLA) weldable structural steel plate with a yield strength of 690 MPa, specifically designed for heavy-duty applications requiring low-temperature toughness. Possessing excellent ductility, weldability, and fatigue resistance, this steel plate is frequently utilized in cranes, mining machinery, and bridge structures.
What Is Q690D Steel Plate Material?
Q690D is a low-alloy, high-strength structural steel plate designed specifically for heavy-duty applications requiring high yield strength (≥690 MPa) and low-temperature toughness (down to -20°C). Primarily utilized in cranes, mining equipment, and bridges, it delivers high load-bearing capacity through its exceptional performance while simultaneously enabling weight reduction through enhanced strength.
Chemical Composition of Q690D Steel Plate
| Element | Q690D Max Content (wt%) |
|---|---|
| Carbon (C) | ≤ 0.18 |
| Silicon (Si) | ≤ 0.60 |
| Manganese (Mn) | ≤ 2.0 |
| Phosphorus (P) | ≤ 0.030 |
| Sulfur (S) | ≤ 0.025 |
| Nickel (Ni) | ≤ 0.80 |
| Chromium (Cr) | ≤ 1.00 |
| Molybdenum (Mo) | ≤ 0.30 |
| Niobium (Nb) | ≤ 0.11 |
| Vanadium (V) | ≤ 0.12 |
| Titanium (Ti) | ≤ 0.020 |
| Boron (B) | ≤ 0.004 |
| Aluminum (Al) | ≥ 0.015 |
Mechanical Properties of Q690D Steel Plate
| Plate Thickness (mm) | Yield Strength, min (MPa) | Tensile Strength (MPa) | Elongation, min (%) | Impact Energy AKV at -20°C, min (J) | Cold Bend 180° |
|---|---|---|---|---|---|
| ≤ 16 | ≥ 690 | 770–940 | ≥ 14 | ≥ 47 | d = 3a |
| 16–40 | ≥ 670 | 770–940 | ≥ 14 | ≥ 47 | d = 3a |
| 40–63 | ≥ 660 | 770–940 | ≥ 14 | ≥ 47 | d = 3a |
| 63–80 | ≥ 640 | 730–940 | ≥ 14 | ≥ 47 | d = 3a |
What Are The properties of Q690D Steel Plate Material?
High Strength: Featuring a yield strength of ≥ 690 MPa and a tensile strength ranging from 770 to 940 MPa, this material provides exceptional load-bearing capacity while facilitating structural weight reduction.
Low-Temperature Toughness: Specifically evaluated and certified for service environments down to -20°C (Grade "D"), effectively preventing brittle fracture in cold climates.
Excellent Weldability: Q690D is designed to maintain structural integrity post-welding, making it an ideal material for the fabrication of large-scale assembled structures.
Plasticity and Toughness: Possessing high ductility, the material is capable of deforming under load rather than undergoing sudden brittle failure; typical elongation (A%) is ≥ 14.
Delivery Condition: Typically produced in a quenched and tempered (Q&T) condition to ensure optimal strength properties and structural consistency.
Applications of Q690D Steel Plate
Construction and Engineering Machinery: Used in the manufacture of various components for cranes (booms, outriggers), excavators (booms, buckets), loaders, and bulldozers.
Mining and Heavy Equipment: Widely utilized in hydraulic supports for coal mines, as well as in other heavy lifting and mining machinery applications.
Infrastructure and Bridge Engineering: Applied in the construction of large-span bridge trusses and various structural components.
Marine and Offshore Structures: Employed in offshore wind power installation platforms and other marine engineering sectors, including port machinery.
Heavy Transport Vehicles: Used in the manufacturing of chassis and structural components for heavy-duty trucks, flatbed transporters, and trailers.
Why Choose Us?
1. Professional Manufacturing Facility
We operate our own factory and possess over 10 years of manufacturing experience in the field of lifting equipment.
2. High-Quality Assurance
All our products undergo rigorous inspection:
This includes analysis of chemical composition and mechanical properties, hydrostatic testing, dimensional and visual inspections, as well as non-destructive testing.
3. Competitive Pricing
As a direct factory supplier, we offer highly competitive prices while ensuring uncompromising quality.
4. Rapid Delivery
We utilize professional packaging to ensure that goods remain safe and undamaged during transit.
5. OEM Customization Services
Prior to the placement of a formal order, we can produce samples tailored to your specific requirements.
6. Exceptional Service
Your inquiries will be answered within 8 hours; in cases involving significant time zone differences, we guarantee a response within 24 hours.
7. Problem-Solving Assistance
We maintain a professional team dedicated to providing you with robust support, assisting you in resolving any issues encountered-from the procurement stage through to actual application.
Contact now to get Q690D steel plate
| Specification | Width: 600-3000mm Thickness:2mm-100mm or as customers' special requirements; |
| Length | Length 1000-12000mm or as customers' special requirements |
| Grade | Q690D |
| Standards | GB/T24186-2009, Q/OHAC 839-2021, GB/T709-2006, ASTM A36, JIS G4051,DIN EN10083, SAE 1045, ASTM A29M |
| Surface | Smooth, straight, bright, no blur on both ends |
| Packaging | Standard exporting packing or as client's requirement |
| Certificate | ISO9001:2008 |
| Processing technique |
1.Heat treatment facilities for hot-rolled, controlled rolling,normalizing. 2.Annealing, tempering, quenching, normalizing plus tempering, quenching and tempering. 3. Other delivery states are available as customers' requirement. |
| Feature of hot rolled steel plate |
1.Heat conduction. 2.Excellent freezing, even structure with pressure resistance. 3.Good mechanical properties |
| Excellent performances |
1.High strength, good toughness. 2.Easy for molding process and good weld ability. |
| Main application |
1.Automobile, Bridges, Buildings. 2.Machinery, Pressure vessel industries. 3.Ship building, Engineering construction. 4.Mechanical manufacturing, Pavement slab, ect. |
What are the characteristics of Q690D's chemical composition?
It features a low carbon equivalent design and incorporates micro-alloying elements such as Chromium (Cr), Nickel (Ni), Molybdenum (Mo), Vanadium (V), and Boron (B) to improve hardenability and strength.
What is the tensile strength of Q690D?
The tensile strength of Q690D generally ranges from 770 MPa to 940 MPa.
How is the weldability of Q690D steel plate?
Although it presents some welding challenges due to its high strength, good welded joints can be achieved by using low-hydrogen welding processes, proper preheating (typically 100-150°C), and controlling interpass temperatures.
What is the difference between Q690D and Q690E?
The main difference lies in the impact test temperature: Q690D is tested at -20°C, while Q690E is tested at -40°C. Grade E offers better low-temperature toughness.