Product Overview
AWS E10015-G low alloy steel electrode is an ultra-low hydrogen welding material developed by Hangzhou Lin'an Dayang Welding Material Co., Ltd. for 690MPa grade low alloy high strength steel. It adopts a unique nickel-molybdenum alloy system (Ni 1.8-2.2%, Mo 0.4-0.6%) and a low hydrogen sodium coating to achieve an excellent impact toughness of 82J at -50℃, which is particularly suitable for welding high restraint structures and low temperature service environments. The product complies with AWS A5.5 standards and has passed ISO 9001 quality management system certification. It is an ideal choice for key projects such as oil and gas equipment and bridge steel structures.
Core advantages: German Spectro Max spectrometer monitors the ingredients throughout the process, three quality inspections (raw materials/process/finished products) ensure that the diffusible hydrogen content of each batch is ≤5mL/100g, and the X-ray flaw detection pass rate is 99.8%.
Technical parameters and performance
Key mechanical properties
| Item | Standard requirement | Typical value | Test standard |
|---|---|---|---|
| Tensile strength | ≥690 MPa | 730 MPa | AWS A4.1 |
| Yield strength | ≥620 MPa | 660 MPa | AWS A4.1 |
| Elongation | ≥17% | 24% | AWS A4.1 |
| Impact energy (-50℃, V type) | ≥27 J | 82 J | AWS A370 |
| Diffusible hydrogen content | ≤5 mL/100g | 3.8 mL/100g | AWS A4.3 |
Chemical composition of deposited metal (%)
| C | Mn | Si | S | P | Cr | Ni | Mo |
|---|---|---|---|---|---|---|---|
| ≤0.10 | ≥1.0 | ≤0.6 | ≤0.030 | ≤0.030 | ≤0.2 | 1.8-2.2 | 0.4-0.6 |
Specifications
Diameter: 2.5mm / 3.2mm / 4.0mm
Length: 300mm (2.5mm) / 350mm (3.2mm/4.0mm)
Shelf life: 12 months (original packaging, unopened, stored in a humidity environment of ≤60%)
|
Packaging Details: |
5kg/ctn,20kgs/ctn, 1ton/pallet |
|
Delivery Detail: |
within 25 days after receiving your order |
Application Areas
• Oil and gas equipment: repair welding of blowout preventer shell of PetroChina Xinjiang Oilfield (ASTM A487 Grade 4 steel, carbon equivalent 0.77%)
• Bridge engineering: welding of auxiliary pier steel structure of Hangzhou Bay Cross-sea Bridge (Q690D steel plate)
• Pressure vessel: welding of 1500m³ LNG tank pipe of Sinopec Zhenhai Refining
Customer Mr. John: I have used this product to weld steel pressure vessels, and the first pass rate has increased to 98.6%, and the welding defects have been reduced by 72% compared with traditional electrodes. It is really great.
Welding process guidance
Recommended welding parameters
| Electrode diameter | Welding current (DC+) | Arc voltage | Welding speed | Preheat temperature | Interpass temperature |
|---|---|---|---|---|---|
| 2.5mm | 70-90A | 22-24V | 140-160mm/min | 100-120℃ | ≥90℃ |
| 3.2mm | 100-130A | 24-26V | 120-140mm/min | 120-150℃ | ≥100℃ |
| 4.0mm | 150-180A | 26-28V | 100-120mm/min | 150-200℃ | ≥120℃ |
Key points of operation
- Welding rod treatment: bake at 400-430℃ for 2 hours, store in 100-150℃ insulation tube, use within 4 hours after taking out
- Workpiece cleaning: remove rust, oil, moisture, groove angle recommended 60°±5°, no blunt edge
- Welding skills: use short arc welding, lateral swing amplitude ≤2.5 times welding rod diameter, thickness of each layer ≤4mm for multi-layer welding
- Post-heat treatment: for structures with thickness >30mm or high restraint, keep warm at 250-300℃ for 2 hours immediately after welding
FAQ
Q: What role do nickel and molybdenum play in welding rods?
A: Nickel (Ni) mainly improves the low-temperature toughness of weld metal, so that the product can still maintain an impact energy of 82J at -50℃; molybdenum (Mo) can refine the grains, improve high-temperature strength and creep resistance, and is particularly suitable for structures such as oil and gas pipelines that serve in high-temperature and high-pressure environments for a long time.
Q: Why is the impact energy test carried out at -50℃?
A: This temperature is set according to the requirements of the ASME BPVC specification for low-temperature pressure vessels. The impact energy of E10015-G at -50℃ is 82J, far exceeding the standard requirement of 27J, indicating that it can still maintain excellent brittle fracture resistance at extremely low temperatures and is suitable for cold areas or low-temperature working conditions.
Q: How to deal with unused welding rods after opening?
A: Recommendation: The remaining welding rods should be immediately sealed and stored in a drying cabinet with a humidity of ≤60%. They should be re-baked (350℃×1 hour) before being used again. The cumulative baking time should not exceed 3 times. Welding rods that have not been used for more than 7 days after opening are not recommended for use in critical structures such as pressure vessels even if they are re-baked.
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