What is the Q315NS steel?

Q315NS steel description

Q315NS expression method: Q—the first character of the Chinese pinyin of "qu" in the yield strength;

315—The lower yield limit of steel, in MPa;

NS—respectively the first character of the Chinese Pinyin of "Nai" and "Sour".

Q315NS steel is a kind of acid-resistant steel. It refers to the addition of a certain amount of alloying elements to the steel to increase the resistance to sulfuric acid generated by the combination of sulfur trioxide and water below the dew point when the steel is exposed to sulfuric acid gas (such as a steel chimney containing exhaust gas). Corrosion performance.

Corrosion resistance:

According to the test method specified in JB/T7901, the corrosion rate is not more than 10mm/a (0.89mg/cm²*h, 30% relative to the corrosion rate of Q235B under the conditions of temperature 20℃, sulfuric acid concentration 20%, and full immersion for 24 hours) ; Under the condition of temperature 70℃ and full immersion 24h, the average corrosion rate is not more than 250mm/a (22.4mg/cm²*h, 50% relative to Q235B corrosion rate).