J807
Description:
J857T is a low hydrogen sodium type coating of low alloy high strength steel electrode. Using DC reverse, can be all-position welding, welding process performance. Deposited metal welding after quenched and tempered heat treatment (the quenching and tempering heat treatment process using E-class steel heat treatment, namely immersion 900 ℃ quenching and tempering temperature of 500 ℃ or more), can be high strength and toughness of the excellent mechanical properties, complete Meet the E-class mechanical properties of steel requirements.
use:
Can be widely used in E-class cast steel railcar towing, hooks and other components of the defect repair welding.
Deposited metal chemical composition (%)
| C | Mn | Si | S | P | Ni | Mo |
guarantee value | ≤0.08 | 1.30 ~ 2.00 | ≤0.50 | ≤0.030 | ≤0.035 | 2.00 ~ 4.00 | ≤1.00 |
Example value | 0.058 | 1.41 | 0.19 | 0.006 | 0.012 | 3.12 | 0.48 |
Deposited metal mechanical properties (after quenched and tempered)
Pilot projects | Rm (N / mm 2 ) | ReL / Rp 0.2 (N / mm 2 ) | A (%) | KV 2 (J) |
-40 ℃ |
guarantee value | ≥830 | ≥740 | ≥12 | ≥27 |
Example value | 875 | 810 | 17 | 46 |
Deposited metal diffusion hydrogen content: ≤ 5.0ml / 100g (chromatography or mercury method)
X-ray detection:
I level
Reference current (AC, DC)
Electrode diameter (mm) | φ3.2 | φ4.0 | φ5.0 |
Welding current (A) | 90-120 | 140-180 | 170-210 |
Precautions:
1. The electrode before welding shall be baked at 400 ℃ for 1 hour.
2. Before welding, the rust, oil, moisture and other impurities on the weldment must be removed.
3. Weld after welding quenched and tempered, the 900 ℃ water quenching and tempering air cooling 550 ℃.
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