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S500QL1 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 S500QL1 high strength steel plate is a high-yield strength, quenched and tempered, fine-grained structural steel plate that combines high strength with excellent low-temperature toughness.

Standard :
EN 10025-6
Grade :
S500QL1
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 S500QL1 is a high-strength quenched and tempered structural steel under the European Standard (EN) system. The core characteristics of EN 10025-6 S500QL1 High Strength Steel Plate are high strength (yield strength ≥ 500 MPa) and excellent low-temperature toughness (impact energy tested at -60°C ≥ 30 J).

It is primarily used in load-bearing structural applications that require strict material strength and low-temperature toughness, such as engineering machinery, bridges, and offshore engineering.

Grade	S500QL1
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

Grade	S500QL1
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

* The chemical composition of EN 10025-6 S500QL1 High Strength Steel Plate is adjusted within a certain range depending on the thickness.

Carbon Equivalent of S500QL1 High Strength Steel Plate

Grade	Thickness (t) [mm]	CEV [max, %]
S500QL1	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

* Yuxin Steel has sufficient stock of EN 10025-6 S500QL1 high-strength steel plates. For detailed information, please contact us for inquiries.

Mechanical Properties

Grade	Thickness (t) [mm]	Yield Strength (ReH) [min, MPa]	Tensile Strength (Rm) [MPa]	Elongation (A) [min, %]	Impact Energy (KV) [min]
S500QL1	3 ≤ t ≤ 50	500	590 - 770	17	30J (at -60°C, Longitudinal)
	50 < t ≤ 100	480	590 - 770	17	30J (at -60°C, Longitudinal)
	100 < t ≤ 150	440	540 - 720	17	30J (at -60°C, Longitudinal)

* The strength of S500QL1 high strength steel plate slightly decreases as the thickness increases.

Applications

EN 10025 S500QL1 High Strength Steel Plate is primarily used in the following scenarios:

1. Engineering machinery: Structural components subjected to dynamic loads, such as crane booms, excavator arms, and loader frames.

2. Offshore engineering: Offshore platform columns, subsea pipeline support structures (resistant to low-temperature and corrosive seawater environments, requiring anti-corrosion treatment).

3. Bridges and buildings: Load-bearing beams for long-span bridges, core frames of high-rise steel structures (preferred for use in cold regions).

4. Heavy-duty vehicles: Mining truck bodies, special transport vehicle frames (designed to withstand heavy loads and bumpy impacts).

5. Pressure vessels: Shells for medium- and low-pressure pressure vessels (must meet strength and low-temperature safety requirements, such as liquefied natural gas tank accessories).

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 S500QL1 High-strength Steel Plate

Standard	Grade	Yield Strength (MPa)	Impact Temperature (°C)	Delivery Condition	Equivalence Evaluation
EN 10025-6	S500QL1	500	-60	Quenched & Tempered	Reference Grade
GB/T 16270 (China)	Q550F	550	-60	Quenched & Tempered	High-strength alternative, 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.