1. High thermal conductivity: Compared with austenitic stainless steel, 430 stainless steel pipe has higher thermal conductivity. This means they can dissipate heat more efficiently, and maintaining the heat required for welding can be challenging.

2. Rapid cooling rate: 430 stainless steel pipes tend to experience rapid cooling rates during the welding process, especially in thicker sections. This rapid cooling can lead to the formation of brittle phases, such as martensite, in the heat-affected zone, increasing the risk of cracking.

3. Sensitivity to hydrogen embrittlement: Ferritic stainless steel is more susceptible to hydrogen embrittlement during the welding process. The welding process introduces hydrogen into the material, which if not managed properly can lead to the formation of hydrogen-induced cracks.

4. Susceptibility to hot cracking: 430 ferritic stainless steel is prone to hot cracking, especially in the presence of impurities such as sulfur and phosphorus. The welding process can introduce these impurities, and proper welding techniques such as preheating and controlling interpass temperature are critical to minimizing the risk of hot cracking.

5. Limited ductility at low temperatures: 430 stainless steel exhibits reduced ductility at lower temperatures, and the welding process involves localized heating and cooling. This temperature fluctuation can cause embrittlement of the welded joint and reduce toughness.

6. Formation of chromium carbide: Ferritic stainless steels may be prone to the formation of chromium carbide at grain boundaries, especially when the carbon content is high. This results in sensitization of the heat affected zone and reduced corrosion resistance.

Cherry
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Email: Cherry@jinyoumetal.com
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