Steel Name:P690QL2 Boiler steel plate,P690QL2 Pressure vessel steel plate
Steel Grade:P690QL2 Steel Standard: EN10028-6
Thickness:6mm-450mm Width:1200mm-4200mm
Length:3000mm-18000mm Surface Treatment:Shot blasting and painting or coated
Main application of EN10028-6 P690QL2 are used to build boilers and pressure vessels such as petroleum, chemical industry, power plants.
Additional technical services for P690QL2 boiler steel plate from Xinsteel which including Heat treatment(Normalized,TMCP,Quenched and Tempered,N+T),Z-test (Z15,Z25,Z35),Ultrasonic Examination,Low temperature impacting test,DWTT,PWHT and cutting&welding into special pieces for end users. Mill test certificate issued under EN 10204 format.
1. 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)
2. What mechanical properties must be certified?
Answer:
| Property | Requirement | Test Standard |
|---|---|---|
| Tensile Strength | 770-940 MPa | EN ISO 6892-1 |
| Yield Strength | ≥690 MPa | EN ISO 6892-1 |
| Elongation | ≥14% (t≤16mm) | EN ISO 6892-1 |
| Impact Energy | 40J at -40°C | EN ISO 148-1 |
| Through-thickness | ≥35% RA | EN 10164 |
3. 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
4. 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
5. 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
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