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S550 High-Strength Low-Alloy Structural Steel Coil
S550Q (Quenched & Tempered, general structural use)
S550QL (Quenched & Tempered, improved toughness for low-temperature applications)
S550QL1 (Enhanced impact toughness vs. QL)
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Product Parameters

Product Parameters

Product NameHigh-Strength Low-Alloy Structural Steel Coil
Production ProcessHot Rolling, Cold Rolling
Material StandardsAISI, ASTM, ASME, DIN, BS, EN, ISO, JIS, GOST, SAE, etc.
Width45mm-2200mm
LengthCustom Size
ThicknessHot Rolling: 2.75mm-100mm
Cold Rolling: 0.2mm-3mm
Delivery ConditionsRolling, Annealing, Quenching, Tempered or Standard
Surface ProcessOrdinary, Wire Drawing, Laminated Film

Chemical Composition (Weight %)

ElementS550QS550QLS550QL1
C (Carbon)≤0.20≤0.18≤0.16
Si (Silicon)≤0.80≤0.80≤0.80
Mn (Manganese)≤1.70≤1.70≤1.70
P (Phosphorus)≤0.025≤0.020≤0.020
S (Sulfur)≤0.015≤0.010≤0.010
Nb (Niobium)≤0.06≤0.06≤0.06
V (Vanadium)≤0.20≤0.12≤0.12
Ti (Titanium)≤0.05≤0.05≤0.05
Cr+Ni+Mo≤1.50≤1.50≤1.50

Physical Properties

PropertyS550QS550QLS550QL1
Yield Strength (YS)≥550 MPa≥550 MPa≥550 MPa
Tensile Strength (TS)650–850650–850650–850
Elongation (A₅)≥14%≥16%≥17%
Impact Energy (KVₐ)≥30J @ -20°C≥40J @ -40°C≥50J @ -60°C

Typical Applications

Heavy Machinery & ConstructionCrane booms, truck chassis, mining equipment.
Offshore platforms, wind turbine towers.
Pressure Vessels & EnergyStorage tanks (API, ASME standards).
Pipelines for high-pressure gas/oil.
TransportationRailway wagons, shipbuilding components.
Military vehicle armor (secondary applications).
Bridges & InfrastructureHigh-load-bearing girders, seismic-resistant structures.


Product Display

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Product Application

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Product Packaging

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Factory Display
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FAQ

Q:Can I get samples before order ?

A:Yes, of course. Usually our samples are free,we can produce by your samples or technical drawings.

Q:Can I go to your factory to visit?

A:Of course, we welcome customers from all over the world to visit our factory.

Q:How can I get a quotation from you ?

A:You can leave us message, and we will reply every message in time. Or we may talk on line.

Q:What product information do I need to provide?

A:You need to provide the grade, width, thickness, coating and the number of tons you need to purchase.

Q:Does the product have quality inspection before loading?

A:Of course, all our products are strictly tested for quality before packaging, and unqualified products will be destroyed.we accept the third party inspection absolutely.

Q:What are the advantages of your company?

A:（1）More Than 30 year's Experience

（2）The company is a modern steel enterprise group integrating precision manufacturing, spot warehousing, international logistics, and product deep processing.

（3）World-class production equipment, product quality that meets international certifications, and timely and thoughtful after-sales service

（4）Never stop product research and development and innovation to create high-quality products that meet the global standards.

（5）Integrity business philosophy, the highest quality products, the most reasonable prices, and a global marketing network.

Q:How do we trust your company?

A:We specialise in steel business for years as golden supplier on Alibaba, headquarter locates in liaocheng, Shandong province, you are welcome to investigate in any ways, by all means, you could place an order in Alibaba with trade assurance which could secure your payment.

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