Q550D Low Alloy High Strength Structural Steel Plate - High Strength and Toughness for Lightweight Designs
Product Overview
Q550D is a kind of low alloy high-strength structural steel, its grade means: "Q" stands for yield strength, "550" stands for the lower limit of yield strength of 550MPa, "D D" represents the quality grade, indicating that it has -20℃ impact toughness. This product strictly follows the GB/T 1591-2018 "Low Alloy High Strength Structural Steel" standard, and through micro-alloying design and controlled rolling and cooling process, it achieves a perfect combination of high strength, high toughness and good weldability, and is a key material for realizing the lightweighting of engineering structures and enhancing safety and economic benefits.
Core features and advantages
High strength and light weight
Significant weight reduction: Its yield strength (≥550MPa) is much higher than that of ordinary Q235 steel, which can significantly reduce the thickness of structural parts under the same load requirement, realise the lightweight of equipment and structure, and reduce energy consumption and manufacturing cost.
High load-bearing capacity: high tensile strength, suitable for bearing high loads on key structural parts.
Excellent low-temperature toughness
Strong resistance to brittle fracture: "D" level quality requirements to ensure that the product in the -20 ℃ low-temperature environment still has a good impact toughness, effectively preventing the structure in the low temperature or impact load under the brittle fracture, high safety and reliability.
Excellent welding performance
Low carbon equivalent: Through advanced composition design, carbon equivalent (Ceq) and crack sensitivity coefficient (Pcm) are effectively controlled, so the welding performance is significantly better than that of wear-resistant steel of the same strength, and the performance of the welded joint area is stable.
Adaptation to advanced welding process: Applicable to a variety of welding methods, providing convenience for the manufacture of large and complex structural parts.
Excellent economic benefits
Low life-cycle cost: Although the unit price is high, it can bring significant overall economic benefits by reducing structural weight, simplifying the manufacturing process, and improving the energy efficiency and safety of the equipment.
Typical Applications
Q550D is used in a wide range of applications for large engineering structures where weight, strength and safety are important:
Construction machinery: crane booms and chassis; concrete pump truck booms; excavator platforms and track beams.
Mining machinery: mining dump truck frame; derrick support structure.
Architectural steel structure: key load-bearing parts for high-rise buildings and large-span stadiums.
Bridges and vehicles: bridge components, heavy transport vehicle carriage skeleton.
Technical parameters (in line with GB/T 1591-2018 standard)
| Item | Parameter Indicator | Remarks |
| Yield Strength Rp0.2, MPa | ≥ 550 | |
| Yield strength Rp0.2, MPa | ≥ 550 | | Tensile strength Rm, MPa | 670 - 830 | | | Elongation after break A
Tensile strength Rm, MPa | 670 - 830 | | Elongation at break A, % | ≥ 16
| Impact KV2 (-20°C), J | ≥ 47 | Guaranteed low temperature toughness | Chemical composition (melting) | Chemical composition (melting) | Chemical composition (melting), J ≥ 47
| Chemical composition (melt analysis), % | | Low carbon equivalent design | | Low carbon equivalent design | | Low carbon equivalent design | | Low carbon equivalent design | | Low carbon equivalent design
| Silicon (Si) ≤ 0.60 || Manganese (Mn)
| Manganese (Mn) ≤ | 1.80 | |
| Phosphorus (P) ≤ | 0.025 | |
Sulphur (S) ≤ | 0.015 | | Other Alloying Elements | Moderate
| Other alloying elements | Add niobium (Nb), vanadium (V), titanium (Ti), etc. | Refinement of grain to improve toughness
(Note: The above are typical values, the specific parameters are subject to the material certificate provided by our company.)
Contact us today for a customised product solution and quotation!
Mail:zhen.li@bgtsteel.com
Company Address:
1. Changzhou Guantao Trading Co., Ltd.
Building 2, Block 1, No. 16 Youyi Road, Tianning District, Changzhou, China.
2. Jiangyin Guantao Wear-Resistant Materials Co., Ltd.
Room A606-1, New Yangtze River Logistics Park, No. 538 Binjiang West Road, Xiagang Subdistrict, Jiangyin, Wuxi, China.
3. Jiangyin Baoguantao Import and Export Co., Ltd.
Room A606-2, New Yangtze River Logistics Park, No. 538 Binjiang West Road, Xiagang Subdistrict, Jiangyin, Wuxi, China.
4. Baoguan Metal Technology (Changzhou) Co., Ltd.
10-16#, Block 2, No. 16 Youyi Road, Tianning District, Changzhou, China.
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