S690Q is a High-Strength Low-Alloy (HSLA) steel (yield strength 690 MPa) processed by quenching and tempering for heavy-duty, high-stress structures like cranes, while Q235B is a common, lower-strength carbon structural steel (yield strength 235 MPa) used broadly in general construction, offering good weldability but much lower performance than S690Q. The key difference is strength: S690Q is nearly three times stronger, making it for specialized, demanding applications, whereas Q235B is for general purpose, less critical uses.
| Feature | Q235B | S690Q |
|---|---|---|
| Executive Standard | Chinese GB/T 700-2006 | European EN 10025-6:2004 |
| Steel Type | Ordinary carbon structural steel (non-alloy) | Quenched & tempered high-strength alloy structural steel |
| Name Definition | Q=Yield strength, 235=Minimum yield strength 235MPa, B=Quality grade (room-temperature impact test) | S=Structural steel, 690=Minimum yield strength 690MPa, Q=Quenched & Tempered |
| Equivalent Grades | US ASTM A36, Japanese SS400, European S235JR | Chinese Q690E, US A514 Gr.Q, Australian AS/NZS 3679.1 Gr.690Q |
High Tensile Steel Plates of S690Q steel grade
S690Q is a high-strength low-alloy structural steel compliant with European and Chinese national standards, implementing EN 10025-6 and GB/T 16270-2009, and corresponding to German material number 1.8931. Its core characteristics include high strength, high toughness, low-temperature resistance, and good weldability. It is widely used in high-load scenarios such as bridges, construction, machinery, ships, and mining equipment, and is particularly suitable for low-temperature environments ranging from -20°C to -40°C.
N10025-6 S690Q high strength steel plate Chemical composition:
| Grade | C % | Si % | Mn % | P % | S % | N % | B % | Cr % |
| S690Q | 0.200 | 0.800 | 1.700 | 0.025 | 0.015 | 0.015 | 0.005 | 1.500 |
| Cu % | Mo % | Nb % | Ni % | Ti % | V % | Zr % | ||
| 0.500 | 0.700 | 0.060 | 2.000 | 0.050 | 0.120 | 0.150 |
EN10025-6 S690Q high tensile steel sheet mechanical properties:
| Grade | Thickness | Min Yield | Tensile | Elongation | Min Impact Energy | |
| S690Q | 8mm-50mm | Min 690Mpa | 770-940Mpa | 14% | -20 | Min 30J |
| 51mm-100mm | Min 650Mpa | 760-930Mpa | 14% | -20 | Min 30J | |
| 101mm-150mm | Min 630Mpa | 710-900Mpa | 14% | -20 | Min 30J |
Performance characteristics of S690Q high strength steel
- High toughness: S690Q high tensile steel can still maintain good performance under low temperature or impact load, effectively absorb energy and reduce the risk of brittle fracture.
- Good welding performance: S690Q high strength low alloy steel can match a variety of welding methods, and the welded joint has high strength and good toughness.
- Excellent fatigue resistance: S690Q low alloy steel material can withstand repeated stress cycles and reduce the occurrence of fatigue cracks. Corrosion resistance: After special anti-corrosion treatment, S690Q low alloy steel has good corrosion resistance.
Q235B hot rolled steel plate
What is Q235B steel?
Q235 is a plain carbon structural steel that is used throughout China. It is also known as Q235A, Q235B, Q235C, and Q235D. Since it is mild steel, it is utilized in production without heat treatment. The Q designates the yield point, and the 235 indicates the yield strength. It has good plasticity and weldability.
Q235B steel Equivalent materials
GB Q235B mild Steel is a Chinese standard Q235 steel series of low carbon structural steel, Q235 steel series has A, B, C, D, and E quality grade. GB Q235B steel is equivalent to the European standard of DIN EN S235JR.
Chemical Composition
Q235B is one of the common steels in China. Its low price can be used for most products with low performance requirements.
Hot-rolled Q235B steel plate has certain elongation, strength, good toughness and castability, and is easy to stamp and weld. It is widely used in the manufacture of general mechanical parts, mainly for welding structural parts with low quality requirements in construction and bridge engineering.
| Grade | Chemical composition % | |||||
| C | Si | Mn | P | S | Cu | |
| Q235B | 0.2 max | 0.35 max | 1.40 max | 0.045 max | 0.045 max | - |
| A36 | 0.26 max | 0.40 max | - | 0.04 max | 0.05 max | 0.20 min |
Mechanical Property
| Grade | Yield strength ReH/(N/mm2) (t≤16mm) min | Tensile strength Rm/(N/mm2) (3mm≤t≤16mm) | Elongation A/% (3mm≤t≤40mm) min | Charpy V test | |
| Temperature/℃ | Impact energy (Longitudinal)/J min | ||||
| Q235B | 235 | 370-500 | 26 | 20 | 27 |
| A36 | 250 | 400-550 | 23 | - | - |
Application Scenarios Comparison
Q235B: Cost-Effective General-Purpose Steel
Civil Construction: General building frames, beams, columns, floor slabs, and reinforcement bars; temporary structures such as scaffolding and formwork.
Ordinary Machinery: Non-load-bearing components like brackets, housings, bases, and simple mechanical parts.
Low-Stress Equipment: Containers, pipelines, and equipment casings for low-pressure, low-temperature environments.
Daily Products: Steel pipes, angle irons, channel steels, and other section steels for general use.
S690Q: High-Performance Heavy-Duty Steel
Heavy Construction Machinery: Core load-bearing components such as crane booms, excavator arms, bulldozer chassis, and hydraulic supports.
Infrastructure Engineering: Key structures of large bridges (bearing plates, main girders), high-rise building steel cores, and offshore platform components.
Energy & Mining Equipment: Wind turbine towers, coal mine hydraulic supports, oil drilling platform structures, and high-pressure vessel shells.
Special Vehicles: Frames of heavy-duty trucks, armored vehicles, and special engineering vehicles requiring high strength and lightweight design.
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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.
| Other steel plate | ||||
| Name | Material | Specification (mm) | Tons | Remark |
| Clad steel plate | P265GH+410,S355JR+410,A516Gr70+316, A537CL1+304L,Q235B+304L,Q345B+304, A516Gr70(NACE)+410,A537CL1+904L, A537CL1+316L,A516Gr70+304L,A537CL1+304 ,A516Gr70+410,A516Gr70+904L |
2-300mm(Based plate),1-50mm(Composited plate) | / | UT, AR, TMCP.Normalized, Quenched and Tempered,Z Direction Test, Charpy V-Notch impact TestThe Third Party Test , Coated or Shot Blasting and Painting. |
| Low Alloy | Q345A, Q345B, Q345C, Q345D, Q345E, Q390, Q420, Q460C, ST52-3, S355J2+N, SS400, SA302GrC, S275NL, 35CrMo | 6 - 350 | 5788.56 | Normalizing, tempered ,controlled rolling, hot rolling , Hot rolling,1st inspection, 2nd inspection, 3rd inspection |
| Pressure Vessel Plate | Q245R, Q345R, Q370R, 16MnDR, 09MnNiDR, 15CrMoR, 14Cr1MoR, 12Cr2Mo1R, SA516Gr60, SA516Gr70, SA516Gr485, SA285, SA387Gr11, SA387Gr12, SA387Gr22, P265,P295,P355GH,Q245R(R-HIC),Q345R(R-HIC) | 3 - 300 | 8650 | Normalizing, tempered ,controlled rolling, hot rolling , Hot rolling,1st inspection, 2nd inspection, 3rd inspection |
| High-Strength Plate | WH785D/E,Q960D/E, Q890D/E,WH60D/E,WH70B,Q550D,Q590D,Q690D/E | 8 - 120 | 3086.352 | Quenched and tempered |
| Wear-Resistant Plate | NM360, NM400, NM450, NM500 | 6 - 150 | 3866.297 | Quenched and tempered |
| Bridge Plate | Q235qC, Q345qC, Q370qC, Q420qC, Q345qDNH, Q370qDNH, A709 - 50F - 2, A709 - 50T - 2 | 8 - 200 | 2853.621 | Hot rolling, normalized ,hot rolling controlled rolling, quenched and tempered + toughness and brittleness |
