roasted blue. Effect of baking blue: anti-corrosion.

This process is mainly to slow down the corrosion rate of iron. There are two common blackening methods: traditional alkaline heating blackening and late normal temperature blackening. However, the blackening process at room temperature is not very effective for low carbon steel, and alkaline blackening is better for A3 steel. Alkaline blackening is subdivided, and there is another difference between primary blackening and secondary blackening.

The main components of blackening liquid are sodium hydroxide and sodium nitrite. When blackening, the required temperature has a large tolerance, which can be obtained between 135 degrees Celsius and 155 degrees Celsius, but the required time is different.

Extended information

Zhangqiu Iron Pot, whose pot is like a mirror, suitable for shallow depth, clear and tidy hammer marks and reasonable superposition. The process needs to go through 12 processes, such as cold forging and hot forging, and it can only be formed after tens of thousands of times of forging. Functionally, it meets the needs of China catering and cooking stir-frying. It is naturally uncoated, easy to control the temperature, not easy to stick to the pot, fuel-saving, long in service life and durable.

For example, the representative of Zhangqiu Iron Pot, Tongshengyong Iron Pot, was used exclusively by Jufengde, Huiquanlou and Yanxitang, three traditional famous shops in Shandong cuisine, before liberation.

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