R717 E9015 B91 is a bainite-martensite heat-resistant steel welding electrode with low-hydrogen sodium coating containing Cr9%-Mo1%-Ni0.8%-V. The E9015 B91 adopts DCEP connection method and is permitted for all positions welding.
The work piece shall be properly preheated and heat treated after welding according to the structural characteristics.
Before welding, the E9015 B91 welding electrode should be baked at about 400℃ for 1h for ready use.
Impurities such as rust, oil stain and moisture must be removed from the work piece before welding.
| Chemical components of deposited metal (%) | |||||||
| Test item | C | Mn | Si | S | P | Cr | Ni |
| Example value | 0.088 | 0.65 | 0.2 | 0.006 | 0.009 | 9.22 | 0.65 |
| Test item | Mo | V | Nb | Cu | Al | N | Mn＋Ni |
| Example value | 1 | 0.2 | 0.043 | 0.02 | 0.005 | 0.033 | 1.3 |
| Mechanical properties of deposited metal (preheated at 745-775℃×2h) | |||
| Test item | Rm (MPa) | ReL/Rp0.2 (MPa) | A (%) |
| Example value | 720 | 620 | 20 |
| Reference current (DC+) | ||||
| Welding electrode diameter (mm) | Φ2.5 | Φ3.2 | Φ4.0 | Φ5.0 |
| Welding current (A) | 60-90 | 90-120 | 130-170 | 170-210 |
