G307
Description:
G307 is a basic coating of Cr17 stainless steel electrodes, using DC reverse, all-position welding.
use:
For welding nitric acid corrosion, heat-resistant Cr17 stainless steel structure.
Deposited metal chemical composition (%)
| C | Mn | Si | S | P | Cr | Ni | Mo | Cu |
guarantee value | ≤0.10 | ≤1.0 | ≤0.90 | ≤0.030 | ≤0.040 | 15.0 ~ 18.0 | ≤0.60 | ≤0.75 | ≤0.75 |
Mechanical properties of deposited metal (specimen at 760 ~ 790 ℃ insulation 1h, with no more than 55 ℃ / h speed furnace cooling to 595 ℃, and then air-cooled)
Pilot projects | Rm (N / mm 2 ) | A (%) |
guarantee value | ≥450 | ≥15 |
Reference current (DC + )
Electrode diameter (mm) | φ2.0 | φ2.5 | φ3.2 | φ4.0 | φ5.0 |
Welding current (A) | 40 ~ 80 | 50 ~ 100 | 70 ~ 130 | 100 ~ 160 | 140 ~ 200 |
Precautions:
1. The electrode must be baked for about 1h at 200 ~ 300 ℃ before welding.
2. Weld before welding preheated to 200 ℃, after welding by 760 ~ 790 ℃ tempering.
3. Before welding the weldment to remove rust, oil, water and other impurities.
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