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S500Q High Strength Steel Plate

Q: What are the weldability characteristics of high-strength low-alloy steel plates?

High-strength low-alloy steel plates offer excellent weldability. As their carbon content is typically low (below 0.2%), they present a lower risk of cracking during welding compared to standard high-strength steel plates and generally do not require complex preheating treatments.

Q: Why are high-strength low-alloy steels the preferred choice in construction and automotive manufacturing?

The key advantage of high-strength low-alloy steels is weight reduction. As they offer greater strength, thinner sheets can be used to withstand the same loads, thereby reducing the overall weight of the structure; in the automotive sector, this leads to improved fuel efficiency.

Q: What is high-strength low-alloy steel (HSLA)?

High-strength low-alloy steel (HSLA) is a type of steel in which small amounts of alloying elements (such as niobium, vanadium, titanium or copper) are added to enhance its mechanical properties. Compared to traditional carbon steel, it offers higher yield strength and better corrosion resistance whilst maintaining good weldability and formability.

Home-Products-High-Strength Low-Alloy Steel Plate-EN 10025-6

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EN 10025-6 S500Q is a thermomechanically rolled, quenched and tempered fine-grained structural steel plate with a minimum yield strength of 500 MPa.

Standard :
EN 10025-6
Grade :
S500Q
Thickness :
3 - 100 mm
Width :
1500 - 2500 mm
Length :
3000 - 12000 mm

Special thickness, width, and length can be negotiated separately.
We also provide customized processing services.If you have any questions, please contact us.

Overview

EN 10025-6 S500Q is a thermomechanically rolled, quenched and tempered, fine-grained, high-strength structural steel plate with excellent mechanical properties, including a yield strength ≥500 MPa and a tensile strength of 590–770 MPa. It is suitable for structures requiring lightweight design and high strength, such as bridges, engineering machinery, and offshore platforms.

Grade	S500Q
Standard	EN 10025-6: Hot-rolled structural steels - Part 6: Technical delivery conditions for flat products of high yield strength structural steels in the quenched and tempered condition
Classification	Hot-rolled Structural Steel
Delivery Conditions	Quenched and Tempered(Q&T)
Approval By Third Party	ABS, DNV, GL, CCS, LR , RINA, KR, TUV, CE
Weldability	Good weldability, but strict process procedures (Pre-heating, Low Hydrogen Welding Materials, Post-Weld Heat Treatment, etc.) must still be followed during welding. The core risks are cold cracking (hydrogen-induced cracking) and toughness degradation in the heat-affected zone (HAZ).
Machinability	Cutting can be performed using laser, plasma, or flame cutting, but heat input must be controlled to avoid embrittlement in the heat-affected zone. It can undergo cold working such as bending and stamping, but with deformation controlled to prevent performance issues due to stress concentration.
Surface Quality	Default is "As-Rolled" surface. Special requirements (such as coating pretreatment) must be specified in the order.
Quality Control	Provide the original material certificate. If required, additional nondestructive testing (such as UT ultrasonic testing), Charpy V-notch impact test, and Z-direction property test (Grades Z15/Z25/Z35) can be added.

Chemical Composition

* The chemical composition of EN 10025-6 S500Q High Strength Steel Plate is adjusted within a certain range depending on the thickness.

Grade	S500Q
Element	C	Si	Mn	P	S	N	B	Cr	Cu	Mo	Nb	Ni	Ti	V	Zr
Content (max, %)	0.200	0.800	1.700	0.025	0.015	0.015	0.005	1.500	0.500	0.700	0.060	2.000	0.050	0.120	0.150

Carbon Equivalent of S500Q High Strength Steel Plate

Grade	Thickness (t) [mm]	CEV [max, %]
S500Q	t ≤ 30	0.47
	30 < t ≤ 50	0.48
	50 < t ≤ 150	0.49

* The carbon equivalent value varies depending on the thickness. The greater the thickness of the steel plate, the higher the upper limit of the allowable carbon equivalent value (CEV).

* Carbon equivalent (CEV) calculation formula (IIW): CEV = C + Mn/6 + (Cr+Mo+V)/5 + (Ni+Cu)/15

* For detailed information, please contact us for inquiries.

Mechanical Properties

* The mechanical properties of S500Q high strength steel plate vary with thickness. With an increase in thickness, there is a slight decrease in strength.

Grade	Thickness (t) [mm]	Yield Strength (ReH) [min, MPa]	Tensile Strength (Rm) [MPa]	Elongation (A) [min, %]	Impact Energy (KV) [min]
S500Q	3 ≤ t ≤ 50	500	590 - 770	17	30J (at -20°C, Longitudinal)
	50 < t ≤ 100	480	590 - 770	17	30J (at -20°C, Longitudinal)
	100 < t ≤ 150	440	540 - 720	17	30J (at -20°C, Longitudinal)

Applications

S500Q high-strength steel plate is primarily used in engineering structures that require a combination of high strength and lightweight characteristics.

Application Field	Typical Components	Core Advantages
Engineering Machinery	Hydraulic Supports, Crane Boom Extensions, Crane Booms, Excavator Support Arms	High bending strength and fatigue resistance, reducing structural weight by 25-30%
Mining & Coal Machinery	Mining Truck Frames, Excavator Support Arms, Coal Mine Support Equipment	Suitable for heavy loads and harsh conditions, excellent wear resistance
Heavy-Duty Vehicles & Port Machinery	Heavy Truck Chassis, Engineering Vehicle Frames, Port Crane Main Girders	Combines high strength with lightweight design; one port crane achieved a 15% weight reduction and a 10% increase in lifting capacity after adoption
Bridge & Building Structures	Large-Span Bridge Load-Bearing Structures, High-Rise Building Core Tubes, Connection Joints	Excellent toughness matching in thickness direction, superior fatigue and seismic resistance
Energy Equipment	Wind Tower Flanges, Hydropower Station Pressure Pipes, Fast Reactor Support Rings for Nuclear Power	Low-temperature toughness and welding reliability, suitable for extreme environments
Shipbuilding & Offshore Engineering	Hull Structures, Deepwater Jacket Platforms, Offshore Wind Power Foundations	Resistance to lamellar tearing and fatigue performance

Other Information

The Differences Between Grades Within The Same Series

Grade	Yield Strength (ReH) [min, MPa]	Tensile Strength (Rm) [MPa]	Elongation (A) [min, %]	Impact Energy (KV) [min]
S500Q	500	590 - 770	17%	30J (at -20°C)
S500QL	500	590 - 770	17%	30J (at -40°C)
S500QL1	500	590 - 770	17%	30J (at -60°C)

* The differences between S500Q, S500QL, and S500QL1 mainly lie in the impact temperature requirements.

Equivalent Grades of EN 10025-6 S500Q High-strength Steel Plate

Standard	Grade	Yield Strength (MPa)	Impact Temperature (°C)	Delivery Condition	Equivalence Evaluation
EN 10025-6	S500Q	500	-20	Quenched & Tempered	Reference Grade
GB/T 16270 (China)	Q500D	500	-20	Quenched & Tempered	Fully equivalent, preferred in Chinese market

* Grade equivalences are only approximate, actual mechanical properties and chemical composition should be compared.

FAQ

Q1:

What are the weldability characteristics of high-strength low-alloy steel plates?

High-strength low-alloy steel plates offer excellent weldability. As their carbon content is typically low (below 0.2%), they present a lower risk of cracking during welding compared to standard high-strength steel plates and generally do not require complex preheating treatments.

Q2:

Why are high-strength low-alloy steels the preferred choice in construction and automotive manufacturing?

The key advantage of high-strength low-alloy steels is weight reduction. As they offer greater strength, thinner sheets can be used to withstand the same loads, thereby reducing the overall weight of the structure; in the automotive sector, this leads to improved fuel efficiency.

Q3:

What is high-strength low-alloy steel (HSLA)?

High-strength low-alloy steel (HSLA) is a type of steel in which small amounts of alloying elements (such as niobium, vanadium, titanium or copper) are added to enhance its mechanical properties. Compared to traditional carbon steel, it offers higher yield strength and better corrosion resistance whilst maintaining good weldability and formability.