1. Chrome stainless steel
Chromium stainless steel is known for its resistance to corrosion from oxidizing acids, organic acids and cavitation, as well as its resistance to heat and wear.
This type of steel is commonly used in power plants, chemical industry, petroleum and other equipment and materials.
However, chrome stainless steel has poor weldability, so it is important to pay attention to the welding process and heat treatment conditions during manufacturing.
2. Chrome 13 stainless steel
Chromium 13 stainless steel has high hardenability after welding and is prone to cracking.
To avoid cracking, it is recommended to use the same type of chrome stainless steel electrode (g202 and G207) for welding and perform preheating above 300°C and slow cooling treatment at around 700°C after welding.
If post-welding heat treatment is not possible, it is recommended to use chrome-nickel stainless steel electrodes (A107, A207).
3. Chrome 17 stainless steel
Chromium 17 stainless steel is enhanced by adding stability elements such as Ti, Nb, Mo, etc. to increase its corrosion resistance and weldability. It has better weldability compared to chromium 13 stainless steel.
When using the same type of chromium stainless steel electrode (G302 and G307), it is recommended to preheat above 200°C and temper at around 800°C after welding.
If post-welding heat treatment is not possible, it is recommended to use chrome-nickel stainless steel electrodes (A107, A207).
4. Chrome-nickel stainless steel
When welding chrome-nickel stainless steel, repeated heating can cause carbides to precipitate, which decreases its corrosion resistance and mechanical properties.
5. Chrome-nickel stainless steel electrode
Chromium-nickel stainless steel electrodes are known for their good resistance to corrosion and oxidation. They are widely used in the chemical industry, chemical fertilizer production, petroleum and medical machine manufacturing.
6. Chrome-nickel stainless steel coating
Chrome-nickel stainless steel coatings come in two types: titanium-calcium and low hydrogen. The titanium-calcium type can be used with both AC and DC power sources, but AC welding has shallow penetration and is prone to redness, so it is recommended to use DC power whenever possible.
Welding electrodes with a diameter of 4.0 mm or less can be used for all-position welding, while electrodes with a diameter of 5.0 mm or larger are recommended for flat welding and flat fillet welding.
7. Welding Rod
It is important to keep the electrode dry during use.
The titanium-calcium type should be dried at 150°C for 1 hour, and the low hydrogen type should be dried at 200-250°C for 1 hour. Repeated drying is not allowed, as it can cause cracking and peeling of the coating. This prevents oil and other dirt from adhering to the electrode coating, which would increase the carbon content of the weld and negatively impact the welding quality.
8. Welding current
To avoid eye corrosion caused by overheating, it is important to use a welding current about 20% lower than that used for carbon steel electrodes and keep the arc short. The middle layer must also be cooled quickly.
A narrow weld bead is preferred for best results.
