Q690C steel is a high-strength low-alloy (HSLA) structural steel plate with a minimum yield strength of 690 MPa, specifically designed for heavy-duty engineering applications. This steel plate maintains excellent toughness, weldability, and corrosion resistance even in temperatures as low as -20°C, making it an ideal choice for marine engineering, offshore drilling platforms, and lifting equipment.
Chemical Composition of Q690C Steel
| Material | C | Si | Mn | P | S | Nb | V | Ti | Cr | Ni | Cu | N | Mo | B | Al |
| Q690C | ≤ 0.18 | ≤ 0.60 | ≤ 2.00 | ≤0.030 | ≤0.030 | ≤ 0.11 | ≤ 0.12 | ≤ 0.20 | ≤ 1.00 | ≤ 0.80 | ≤ 0.80 | ≤ 0.015 | ≤ 0.30 | ≤ 0.004 | ≥ 0.015 |
Mechanical Properties of Q690C Steel
| Property | Value/Requirement |
|---|---|
| Yield Strength | ≥ 690MPa (Thickness< 63mm) |
| Tensile Strength | 730–940MPa |
| Elongation | ≥ 14% |
| Impact Temperature | - 20°C |
| Impact Energy | ≥ 31 J(Typically) |
Why Choose for Q690C Steel for Shipbuilding & Offshore Engineering?
Exceptional Strength and Load-Bearing Capacity: Q690C possesses a minimum yield strength of 690 MPa-a level far exceeding that of ordinary carbon steel. This high strength enables it to withstand immense loads, thereby effectively enhancing the load-bearing capacity of structural assemblies.
Superior Toughness and Low-Temperature Resistance: Q690C typically exhibits excellent impact toughness at low temperatures (the "C" designation signifies its impact performance at -20°C). Its robust low-temperature resistance ensures that offshore platforms and ship hulls remain free from brittle fracture, even when operating in harsh environmental conditions.
Enabling Lightweight Design: The utilization of high-strength steels such as Q690C allows design strength requirements to be met using thinner plates. This approach typically results in a weight reduction of 20% to 40%, thereby significantly lowering the deadweight of ships and offshore engineering structures.
High-Quality Weldability and Quenching & Tempering: Q690C achieves its superior comprehensive mechanical properties through a quenching and tempering process. Furthermore, its alloy composition has been optimized to enhance its welding performance; compared to other high-strength steels, Q690C weld joints demonstrate superior resistance to cracking under a stress level of 690 MPa.
Applications of Q690C Steel In Shipbuilding & Offshore Engineering
Offshore Drilling Platforms and Rigs: Used for critical structural components,particularly in jack-up rigs.
Heavy-Duty Crane Structures: Applied in offshore cranes on vessels and platforms, as well as in heavy-duty port cranes where an exceptionally high strength-to-weight ratio is required.
Ship Structural Reinforcements: Used in specific high-load areas within large vessels.
Offshore Support Structures: Employed in structures where extremely high yield strength is required to enhance structural efficiency.
If you require further details regarding Q690C steel, please do not hesitate to contact us.
As a leading manufacturer of Q690C steel in China, GNEE boasts over 20 years of extensive industry experience. Our warehouses maintain a standing inventory of more than 50,000 tons year-round, ensuring that orders can be dispatched in as little as seven days. In terms of quality assurance, we are a dual API and ISO certified supplier and welcome inspections by third-party agencies such as SGS, BV, and Lloyd's.
By choosing our Q690C steel products, you will benefit from our comprehensive, customer-centric support services, as well as our extensive value-added processing capabilities. We would be delighted to provide full-scale support and assistance for your project.
Contact now to get Q690C steel
|
Product Name |
High strength steel plate Q690C |
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Length |
4m-12m or as required |
|
Width |
0.6m-3m or as required |
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Thickness |
3mm-300mm or as required |
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Standard |
AISI,ASTM,DIN,JIS,GB,JIS,SUS,EN,etc. |
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Technique |
Hot rolled |
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Surface Treatment |
Clean, blasting and painting according to customer requirement |
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Thickness tolerance |
±0.1mm |
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Material |
Q690C |
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Application |
It is mainly used to make structural parts such as car girder, beam, transmission shaft and car chassis parts, which can reduce the weight of the parts. |
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MOQ |
25tons.We also can accept sample order. |
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Shipment time |
Within 15-20 workdays after receiving deposit or L/C |
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Export packing |
Waterproof paper, and steel strip packed. |
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Capacity |
250,000 tons/year |
Can Q690C be welded?
Yes, it has good weldability, but preheating and controlled heat input are usually required due to its high strength.
What are the typical applications for Q690C?
Because of its high strength-to-weight ratio, it is used where weight reduction is critical without sacrificing structural integrity:
Lifting Equipment: Crane booms, telescopic arms, and tower cranes.
Mining Machinery: Hydraulic supports, heavy-duty dump truck chassis.
Construction: High-rise building structural columns and bridge support members.
Energy: Wind turbine tower components and offshore platform structures.
What are the international equivalent grades for Q690C?
When working on global projects, you can look for these equivalents:
European Standard (EN 10025-6): S690Q (0°C impact).
American Standard (ASTM): ASTM A514 Grade Q or Grade P.
Commercial Brands: Strenx 700 (formerly Weldox 700) by SSAB, XABO 690 by ThyssenKrupp.