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S460QL1 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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Standard :
EN 10025-6
Grade :
S460QL1
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 S460QL1 is a premium, quenched and tempered steel plate that offers an outstanding combination of high strength (460 MPa min yield), exceptional low-temperature toughness (-60°C), and good weldability. It is the preferred material for designing structures and machinery that are lightweight, durable, safe, and capable of withstanding extreme loads and harsh environments.

S460QL1 High-strength Steel Plate significantly outperforms comparable steel grades in low-temperature toughness at -60°C and through-thickness performance, making it particularly suitable for critical load-bearing structures in extreme environments.

Specifications for exported EN 10025-6 S460QL1 High-strength Steel Plate:Thickness: 3 - 100 mm, Width: 1500 - 2500 mm, Length: 3000 - 12000 mm.

Other specifications can be customized for cutting.

Grade	S460QL1
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 carbide tools, laser, plasma, or flame cutting, but heat input must be controlled to avoid embrittlement in the heat-affected zone. Cold working such as bending and stamping requires controlling the deformation rate to avoid the formation of cracks.
Surface Quality	Default surface in hot-rolled condition. Additional treatments such as shot peening and painting can be required upon request.
Quality Control	Provide the original material certificate. Non-destructive testing (such as UT ultrasonic testing), Charpy V-notch impact test, and Z-direction property test (Grades Z15/Z25/Z35) can be added as required.

Chemical Composition

Grade	S460QL1
Element	C	Si	Mn	P	S	Cr	Ni	Mo	Nb	V	Ti	Cu	B	N	Zr
Content (max, %)	0.200	0.800	1.700	0.025	0.015	1.500	2.000	0.700	0.060	0.120	0.050	0.050	0.005	0.015	0.150

* EN 10025-6 S460QL1 High-strength Steel Plate allows for minor variations in the chemical composition of certain elements depending on the thickness.

Carbon Equivalent of S460QL1 High-strength Steel Plate

Grade	Thickness (t) [mm]	CEV [max, %]
S460QL1	t ≤ 30	0.47
	30 < t ≤ 50	0.48
	50 < t ≤ 150	0.50

* 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

Mechanical Properties

Grade	Thickness (t) [mm]	Yield Strength (ReH) [min, MPa]	Tensile Strength (Rm) [MPa]	Elongation (A) [min, %]	Impact Energy (KV) [min]
S460QL1	3 ≤ t ≤ 50	460	550 - 720	17	30J (at -40°C, Longitudinal)
	50 < t ≤ 100	440	550 - 720	17	30J (at -40°C, Longitudinal)
	100 < t ≤ 150	400	500 - 670	17	30J (at -40°C, Longitudinal)

* The strength of S460QL1 High-strength Steel Plate slightly decreases as the thickness increases.

Applications

EN 10025-6 S460QL1 high-strength steel plate is widely used in the following fields due to its high strength, low-temperature toughness, and resistance to lamellar tearing:

1. Large engineering machinery: booms of cranes, chassis structures of excavators.

2. Bridges and buildings: load-bearing components of long-span bridges, steel structural frames of high-rise buildings.

3. Pressure vessels and storage tanks: pressure tanks for low-temperature environments, shells of large storage tanks.

4. Wind power and marine engineering: key sections of wind turbine towers, structural components of offshore platforms.

Other Information

Comparison of Similar Grades

Grade	Yield Strength (ReH) [min, MPa]	Tensile Strength (Rm) [MPa]	Impact Energy (KV) [min]	Typical Application Scenarios
S460Q	460	550 - 720	30J (at -20°C)	Conventional engineering machinery, steel structure workshops
S460QL	460	550 - 720	30J (at -40°C)	Bridges in cold regions, pressure vessels
S460QL1	460	550 - 720	30J (at -60°C)	Arctic equipment, ultra-low temperature storage tanks

* The differences between S460Q, S460QL, and S460QL1 mainly lie in the impact temperature requirements.

International Standard Equivalent Materials

Grade	Standard	Yield Strength (MPa)	Impact Temperature (°C)	Delivery Condition	Equivalence Evaluation
S460QL1	EN 10025-6	460	-60	Quenched & Tempered	Reference Grade
Q460F	GB/T 1591 (China)	460	-60	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.