S690QL VS SM570 ：Comprehensive Comparison of High-Strength Steel Plates

S690QL is a high-strength steel with a minimum yield strength of 690 MPa, while SM570 has a lower minimum yield strength of 570 MPa. S690QL is a high-strength, low-alloy steel that uses a quenched and tempered process, making it suitable for heavy-duty applications where weight reduction is important. SM570 is a high-tensile structural steel with properties that meet the requirements of the Japanese industrial standard JIS G3106.

S690QL is a high-strength quenched and tempered structural steel that conforms to the EN 10025-6 standard. It offers excellent mechanical properties, making it suitable for applications in demanding industries such as construction, mining, and heavy machinery.

Thickness: Available in various thicknesses, typically ranging from 1 mm to 150 mm.

Width: Commonly available widths are from 1100 mm to 6000 mm.

Length: Lengths usually range from 2000 mm to 15000 mm.

Here are the key details about S690QL:

S690QL High Strength Sheet Metal Chemical Composition:

S690QL High Strength Structural steel Mechanical properties:

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JIS SM570 steel plate is high strength carbon steel. SM570 steel has low carbon equivalent and good cold forming property. SM570 steel equivalent grades are ST52-3, A572 Gr.50, EN S355JR and so on. BBN steel is one of the famous JIS SM570 steel plate suppliers in China.

Standard: JIS G3106 (Japan)

Grade: SM570 ("SM" denotes structural rolled steel; "570" indicates minimum tensile strength in MPa).

Applications: Heavy machinery, construction frameworks, bridges, crane components, and other high-strength welded structures.

Chemical Composition

Mechanical Properties

• Key Features:

High Tensile Strength: Ideal for dynamic or impact-loaded structures (e.g., crane booms, excavator arms).

Good Toughness: Optional low-temperature impact testing (e.g., -20°C) for cold-region applications.

Heat Treatment

Delivery Condition: Typically supplied in hot-rolled or normalized state.

Normalizing: Improves homogeneity and machinability.

Quenching & Tempering (Q&T): Optional for higher strength (custom orders).

Weldability

• Guidelines:

Use low-hydrogen electrodes (e.g., JIS Z3211 E7016) to prevent hydrogen-induced cracking.

Post-weld heat treatment (PWHT) is rarely required unless specified for thick sections.

Corrosion Resistance & Surface Protection

Corrosion Resistance: SM570 has no inherent corrosion resistance.

Protection Methods: Painting: Epoxy zinc-rich primer + polyurethane topcoat (for outdoor exposure).

Hot-Dip Galvanizing: Recommended for harsh environments (e.g., coastal bridges).

Surface Preparation: Sandblasting (Sa2.5 grade) to enhance coating adhesion.

• Choose S690QL When:

Operating temperature ≤-20℃

High safety and long service life are required

Lightweight design is pursued (e.g., mobile machinery, ships)

Load is extremely high and structural space is limited

Projects in extreme cold regions (e.g., Northern Europe, Siberia)

• Choose SM570 When:

Service environment ranges from room temperature to -5℃

Strength requirement is satisfied at 570MPa level

Budget is limited but high strength is still needed

Conventional engineering without the need for quenching and tempering

Projects following Japanese standards or with a Japanese-oriented supply chain

Get in Touch

In addition to S690Q Steel Plate,GNEE Steel also supplies a variety of high-strength steel plates, such as A514 Grade F, A572 Grade 50, A588 Grade A, S355JR, S690Q, SS400, S690QL, Q345B, Q345E, etc. If you want to know more about other types of steel plates, you can call the consultation hotline at +8615824687445 or send an email to alloy@gneesteelgroup.com. You are welcome to consult us, and we are very willing to answer your questions.

FAQ

What is the difference between S690Q and S690QL?

S690Q: Minimum impact toughness tested at -20°C (30J average). → Typical Use: Cranes in temperate climates, quarry equipment. S690QL: Certified for -40°C and below (≥40J impact toughness). → Critical Use: Arctic pipelines, offshore platforms, mining vehicles in Siberia.

What grade is S690QL material?

S690QL is a high strength quenched and tempered steel grade that complies to steel specification EN 10025. The designation S690QL refers to a minimum yield strength of 690 MPa.

What is S690 grade steel?

S690 high yield & fine grain steel plate is a high strength, quenched and tempered fine-grain structural steel. Structural steel S690 is used in structures that must withstand very heavy loads. This grade is meant for structures where weight savings is important.

What is the equivalent of S690 steel?

Approximate equivalents
ASTM A514, EN 10149-2 Grade S700MC, AS/NZS 3579 Grade 700, AM 700, Bisalloy 80.

What is the price of S690QL material?

S690QL High Strength Steel Plates, Thickness: 5mm to 150mm at 5,600-13,500 CNY per tonne (approx. 5.6-13.5 CNY per kilogram)/440-900 USD per tonne (approx. 0.44-0.90 USD per kilogram)

What is the hardness of S690 QL steel?

S690QL steel stockholders and suppliers. S690QL is a quenched and tempered high strength steel supplied in full plates or cut pieces with delivery to the whole of the UK. With its high yield of minimum 690MPa it offers better strength than standard carbon steel grades.

What is the effective use of high strength S690 steel in construction?

The high strength S690 steels have an excellent strength-to-self-weight ratio, and they are highly efficient to be used in heavily loaded structures. Typical applications include piles and columns in buildings and supporting members in bridges.

What is the difference between S890QL and S690QL?

S690QL, S890QL, and S960QL are all water quenched and tempered steels that comply with the EN10025:6:2004 specification. These ultra high strength steels have a minimum yield strength of 690 MPa, 890 MPa, and 960 Mpa respectively, making them ideal for use in the haulage sector.

What is the difference between S700MC and S690ql?

The S700MC Steel is basically a structural steel plate developed especially for applications requiring high yield strength. They are used for several load bearing applications. The S690ql is a low alloy structural steel which is high in strength and comes with good weldability.

What is the yield strength of s690 steel?

690 MPa.

Yield strength of 690 MPa. Used in structures bearing extremely heavy loads, such as bridges, offshore drilling rigs and buildings, as well as in heavy construction equipment and cranes.

What is SM570 steel equivalent to?

SM570 steel equivalent grades are ST52-3, A572 Gr. 50, EN S355JR and so on. BBN steel is one of the famous JIS SM570 steel plate suppliers in China. JIS SM570 steel plate offers low yield and tensile strength and is usually supplied in normalized or control rolled delivery condition.

What is the yield strength of SM570?

What are the mechanical properties of SM570?

SM570 has excellent mechanical properties with high tensile strength, yield strength and elongation. Specifically, the tensile strength of SM570 is between 1100-1300 MPa, the yield strength is between 800-900 MPa, and the elongation is between 18%-25%