| R407 | According with GB E6015-B3
Corresponding with AWS E9015-B3 |
| Introduction: R407 is a kind of Cr2.5%-Mo1% pearlitic heat-resistant steel electrode with low-hydrogen natrium type coating. DCRP (Direct Current Reversed Polarity). All-position welding. The weldments should be given preheating and postweld heat treatment according to their structural features. |
| Uses: Used for welding Cr2.5Mo pearlitic heat-resistant steel structures, such as high temperature high pressure pipes below 550℃, chemical equipment for synthesis, equipment for petroleum cracking. |
Chemical Composition of Deposited Metal (%)
| Chemical Composition | C | Mn | Si | S | P | Mo | Cr | | Guarantee Value | 0.05~0.12 | ≤0.90 | ≤0.60 | ≤0.035 | ≤0.035 | 0.90~1.20 | 2.00~2.50 | |
Mechanical Properties of Deposited Metal
| Test Item | Rm(MPa) | ReL或Rp0.2(Mpa) | A(%) | KV2(J) | | Guarantee Value | ≥590 | ≥490 | ≥15 | ≥47(normal temperature) | | General Result | 600~720 | ≥500 | 16~22 | ≥60 | |
| Diffusible Hydrogen Content in Deposited Metal:≤4.0ml/100g(Glycerine Hydrogen Test) |
| X-ray Radiographic Inspection:ⅠDegree |
Reference Current(DC+)
| Electrode Diameter(mm) | φ2.5 | φ3.2 | φ4.0 | φ5.0 | | Welding Current (A) | 60~90 | 90~120 | 140~180 | 170~210 | |
Instructions:
1.The electrodes must be baked under about 350℃ for an hour before welding, and used as soon as baking is completed.
2.The stains on the weldments, such as rust, oil stains, moisture, etc., must be cleared away before welding. |
