P690QL2 is a high-strength quenched and tempered (Q+T) steel plate produced in accordance with the European standard EN 10028-6. Characterized by ultra-high strength (690MPa) and excellent toughness at ultra-low temperatures of -60°C, it is a premium-grade quenched and tempered steel plate primarily used in manufacturing pressure vessels, storage tanks, and structural components for engineering machinery that withstand high stress and low-temperature environments. It is an ideal material for con
- Standard :EN 10028-6
- Grade :P690QL2
- Thickness :6.0-300.0 mm
- Width :1500-4050 mm
- Length :3000-15000 mm
| Grade | P690QL2 |
|---|---|
| Standard | EN 10025-6 (Flat products made of steels for pressure purposes - Part6: Weldable fine grain steels, quenched and tempered) |
| Delivery Conditions | Quenched and Tempered(Q&T) |
| Approval By Third Party | ABS, DNV, GL, CCS, LR , RINA, KR, TUV, CE |
| Weldability | The weldability is acceptable, with relatively high carbon equivalent (CEV) and weld crack sensitivity index (Pcm). Specialized welding procedure specifications (WPS) must be followed, including preheating, the use of low-hydrogen welding consumables, and post-weld heat treatment (PWHT). The core risks are cold cracking (hydrogen-induced cracking) and toughness degradation in the heat-affected zone (HAZ). |
| Machinability | Suitable for flame cutting, laser cutting, and plasma cutting. Heat input must be controlled to avoid embrittlement in the heat-affected zone. Edge grinding may be required after cutting thick plates to eliminate the hardened layer. Cold forming is difficult and may require heating. |
| Surface Quality | Generally provided as rolled surface, can be processed as required, such as sandblasting, shot blasting, pickling, painting, etc. |
| Inspection Requirements | Non-destructive testing (e.g., UT ultrasonic testing) and Z-direction property test (Grades Z15/Z25/Z35) can be added as needed. |
GNEE is a leading manufacturer and global supplier of EN10028-6 P690QL2 pressure vessel plates, engineered for high-pressure, high-strength, and extreme temperature applications. These plates are ideal for B2B exporters, wholesalers, and procurement companies in Ecuador, Peru, Venezuela, UAE, Saudi Arabia, Bahrain, Oman, Qatar, Nigeria, Ghana, Kazakhstan, Russia, Singapore, Vietnam, Thailand, Australia, and Brunei.
Our P690QL2 steel plates offer superior strength, weldability, and toughness, meeting the demands of modern pressure vessel, boiler, and chemical process projects.
Key Features and Advantages
1. Ultra-High Strength
With a yield strength of ≥690MPa, it significantly reduces structural weight while maintaining high load-bearing capacity, enabling the design of lighter and thinner structures.
2. Exceptional Low-Temperature Toughness
QL2 grade retains excellent impact toughness even in ultra-low temperatures as low as -60°C, representing the top tier of steel for low-temperature pressure vessels.
3. Excellent Weldability
A fine-grained microstructure, combined with strict control of alloying elements, ensures strength and toughness in welded joints. However, preheating and strict welding procedures are typically required.
4. Quenched and Tempered Structure
Through quenching and high-temperature tempering, a tempered sorbite structure is achieved, providing an optimal balance of strength and toughness.
Chemical Composition of EN 10028-6 P690QL2 Boiler And Pressure Vessel Steel Plate
| Grade | P690QL2 | ||||||||||||||
| Element | C | Si | Mn | P | S | N | B | Cr | Mo | Cu | Nb | Ni | Ti | V | Zr |
| Content(max, %) | 0.20 | 0.80 | 1.70 | 0.020 | 0.005 | 0.15 | 0.05 | 1.50 | 0.70 | 0.30 | 0.06 | 2.50 | 0.05 | 0.12 | 0.15 |
Mechanical Properties of EN 10028-6 P690QL2 Boiler And Pressure Vessel Steel Plate
| Grade | Thickness (t) [mm] | Yield Strength (ReH) [min, MPa] | Tensile Strength (Rm) [MPa] | Elongation (A) [min, %] | Impact Energy (KV2) [min] | Brinell Hardness (HBW) |
|---|---|---|---|---|---|---|
| P690QL2 | t ≤ 50 | 690 | 770 - 940 | 14 | 27J (at -60°C, transverse) | 220 - 280 |
| 50 < t ≤ 100 | 670 | 770 - 940 | 14 | 27J (at -60°C, transverse) | 220 - 280 | |
| 100 < t ≤ 200 | 630 | 720 - 900 | 14 | 27J (at -60°C, transverse) | 220 - 280 |
Applications of EN 10028-6 P690QL2 Boiler And Pressure Vessel Steel Plate
Due to its excellent combination of properties, P690QL2 is utilized in fields that demand extremely high safety and reliability:
1. Construction Machinery: Key load-bearing components such as crane booms, excavator girders, and mining truck bodies.
2. Mining Equipment: Hydraulic supports and conveyor structural parts.
3. Special Vehicles: Aerial ladder trucks for firefighting and boom arms for aerial work platforms.
4. Bridges and Buildings: Special structures subject to heavy loads or high seismic requirements.
5. Pressure Vessels and Pipelines: Applications involving high pressure, low temperatures, or large diameters (in line with its original design for "pressure purposes").
6. Wind Power: Tower sections and foundation structures (especially suitable for cold regions).
7. Marine Engineering and Shipbuilding: Certain structural components requiring high strength and toughness.
Other Information
Processing and Welding Precautions
1. Cutting:
Plasma, flame, or laser cutting can be used. After flame cutting, for thick plates, the hardness in the cut area may increase, and grinding or annealing may be required.
2. Cold Bending:
Possible, but with significant springback and higher bending force required.
3. Welding:
a) Low-hydrogen welding processes (such as gas-shielded welding, submerged arc welding) must be used.
b) Strictly follow the Welding Procedure Specification (WPS), including preheating (generally required), controlling interpass temperature, and managing heat input.
c) Use matching high-strength, high-toughness welding materials (e.g., electrodes/wires compliant with EN 1600 standards).
d) Post-weld heat treatment (PWHT) or dehydrogenation treatment may be necessary.
The Differences Between Grades Within The Same Series
| Grade | Nominal thickness (mm) | Impact Energy (KV2) [min, transverse] | ||||
|---|---|---|---|---|---|---|
| -60℃ | -40℃ | -20℃ | 0℃ | +20℃ | ||
| P690Q | ≤ 200 | - | - | 27 J | 40 J | 60 J |
| P690QH | ≤ 200 | - | - | 27 J | 40 J | 60 J |
| P690QL1 | ≤ 200 | - | 27 J | 40 J | 60 J | - |
| P690QL2 | ≤ 200 | 27 J | 40 J | 60 J | 80 J | - |
International Equivalent Steel Grades
| Grade | Standard | Yield Strength (ReH) [min, MPa] | Tensile Strength (Rm) [MPa] | Elongation (A) [min, %] | Impact Energy (KV2) [min] |
|---|---|---|---|---|---|
| P690QL2 | EN 10028-6 (European) | 690 | 770 - 940 | 14 | 27J (at -60°C, transverse) |
| Q690F | GB/T 16270 (Chinese) | 690 | 770 - 940 | 14 | 34J (at -60°C, longitudinal) |
Why Choose GNEE P690QL2 Plates?
- Experience: Years of producing high-strength EN10028-6 plates for critical pressure vessels
- Expertise: Engineering consultation for material selection, welding, and fabrication
- Authority: Compliant with EN, ISO, and PED standards for international projects
- Trustworthiness: Fully tested, certified, and export-ready for global B2B clients
Conclusion
For EN10028-6 P690QL2 Pressure Vessel Plates that combine exceptional strength, toughness, and weldability, GNEE is your trusted global B2B supplier.
Contact GNEE today for a quote, technical datasheet, or project consultation, and ensure your pressure vessels, boilers, and chemical units are built with high-performance P690QL2 steel plates.
FAQ
What distinguishes P690QL2 from P690QL1 in cryogenic applications?
Answer:
P690QL2 is optimized for moderate cryogenic service with:
-40°C impact toughness (vs -60°C for P690QL1)
Reduced nickel content (0.40-1.00% vs 0.50-1.20%)
25-30% cost savings while maintaining key strength properties
Simpler heat treatment (single tempering cycle)
Relaxed testing frequency for non-critical thicknesses (<50mm)
How does the heat treatment differ from P690QL1?
Answer:
Modified Q&T process features:
Single-stage tempering (630-660°C × 3hrs)
Standard water quenching (min. 35°C/s cooling rate)
Reduced austenitizing hold time (30min/inch vs 45min)
Optional accelerated cooling for thickness <80mm
Resulting in 18-22% faster production vs P690QL1
What welding procedures are recommended?
Answer:
Standard Welding Protocol:
Preheat: 225-275°C (for t>30mm)
Consumables: EN ISO 16834-A G 80 7 M21 6Ni2Mo
Heat Input: 1.0-2.0 kJ/mm
Interpass Temp: 230-270°C
PWHT: 620-640°C × 2hrs + 30min/25mm
Testing: Impact at -40°C + hardness ≤320HV
Special Notes:
• No buttering required for thickness <100mm
• Hydrogen control <3ml/100g deposit
• Macro-examination mandatory for first production weld
When should engineers specify P690QL2?
Answer:
Ideal for:
✔ LPG storage (-40°C service)
✔ Industrial gas processing
✔ Cost-sensitive cryogenic projects
✔ Thickness range 15-120mm
Not recommended for:
✖ LNG primary containment (-162°C)
✖ Fracture-critical designs requiring -60°C toughness
✖ Sour service without NACE testing
Hot Tags: en10028-6 p690ql2 for pressure vessel plate, China en10028-6 p690ql2 for pressure vessel plate manufacturers, suppliers, factory, C15 Carbon Steel Round Bar, Hot Rolled Boiler Pressure Vessel Plate, Pressure Vessel Steel
