Comparison of corrosion resistance between SS400 steel and Q235B steel

SS400 steel and Q235B steel are two common steel grades that follow Japanese Industrial Standards (JIS) and Chinese National Standards (GB/T) respectively. There are certain differences between these two steels in terms of corrosion resistance.

1. Corrosion resistance of SS400 steel
SS400 steel has undergone special anti-corrosion treatment and has good corrosion resistance. It can maintain a long service life under complex environmental conditions, such as oceans, industrial atmosphere, etc. This gives SS400 steel an advantage in applications requiring higher corrosion resistance.

2. Corrosion resistance of Q235B steel
The corrosion resistance of Q235B steel is relatively weak. Although it also has certain corrosion resistance, it has not undergone special anti-corrosion treatment like SS400 steel. Therefore, the corrosion resistance of Q235B steel may not be as good as SS400 steel under harsh environmental conditions.

To sum up, the corrosion resistance of SS400 steel is better than that of Q235B steel. If you need to use steel with better corrosion resistance in an engineering project, SS400 steel is a better choice. However, there are other factors to consider when choosing which steel to choose, such as strength, cost and processability.

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