J857CrNi
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| C | Mn | Si | S | P | Cr | Mo | V | guarantee value | ≤0.15 | ≥1.00 | ≤0.60 | ≤0.035 | ≤0.035 | 0.7 ~ 1.10 | 0.5 to 1.00 | 0.05 ~ 0.15 |
Example value | 0.078 | 1.70 | 0.32 | 0.005 | 0.015 | 1.00 | 0.92 | 0.06 |
Deposited metal mechanical properties
Pilot projects | Rm (N / mm 2 ) | ReL / Rp0.2 (N / mm 2 ) | A (%) | KV 2 (J) at room temperature |
guarantee value | ≥830 | ≥740 | ≥12 | - |
Example value | 930 | 815 | twenty one | 76 |
X-ray inspection:
I level
Deposited metal diffusion hydrogen content: ≤ 5.0ml / 100g (chromatography or mercury method)
Reference current (DC +)
Electrode diameter (mm) | φ2.5 | φ3.2 | φ4.0 | φ5.0 |
Welding current (A) | 60 ~ 90 | 80 ~ 110 | 130 ~ 170 | 160 ~ 200 |
Precautions:
1. Before welding electrode to be 400 ℃ baking 1h, and then placed in 100 ~ 150 ℃ incubator, with the use of take.
2. Solder before welding to remove rust and stolen goods, and preheated around 200 ℃.
3. After welding can be 600 ~ 650 ℃ tempering to clear the stress.
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