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S460QL 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.

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EN 10025-6 S460QL high-strength structural steel plate is primarily used in heavy-duty structural applications where high material strength, low-temperature toughness, and weldability are required.

Standard :
EN 10025-6
Grade :
S460QL
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 S460QL High-strength quenched and tempered structural steel plate is primarily used in heavy-duty structures, engineering machinery, bridges, and other fields that require high material strength, low-temperature toughness, and weldability.

Specifications for exported EN 10025-6 S460QL High-strength Steel Plate:Thickness: 3 - 100 mm, Width: 1500 - 2500 mm, Length: 3000 - 12000 mm.

Other specifications can be customized for cutting.

Grade	S460QL
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	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	S460QL
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 S460QL High-strength Steel Plate allows for minor variations in the chemical composition of certain elements depending on the thickness.

Carbon Equivalent of S460QL High-strength Steel Plate

Grade	Thickness (t) [mm]	CEV [max, %]
S460QL	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]
S460QL	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 S460QL High-strength Steel Plate slightly decreases as the thickness increases.

Applications

EN 10025-6 S460QL High-strength Steel Plate is characterized by high strength and high toughness, and is widely used in structures requiring weight reduction or heavy load-bearing. Its main applications include:

1. Construction machinery: booms, frames, and track shoes of excavators, cranes, and loaders.

2. Bridge structures: load-bearing beams and connecting plates for long-span highway/railway bridges.

3. Marine engineering: support structures and jackets for offshore platforms (additional anti-corrosion treatment required).

4. Heavy-duty vehicles: frames and suspension systems of mining trucks and special transport vehicles.

5. High-pressure vessels and storage tanks: steel containers subjected to high pressure (e.g., chemical storage tanks, hydraulic reservoirs).

6. Mining machinery: wear-resistant structural components of crushers and roadheaders.

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
S460QL	EN 10025-6	460	-40	Quenched & Tempered	Reference Grade
Q460E	GB/T 1591 (China)	460	-40	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.