How is the acid resistance of 304 stainless steel plate?

304 stainless steel plate is a versatile stainless steel material with stronger anti-rust performance than 200 series stainless steel materials. It is also relatively good in terms of high temperature resistance and can reach temperatures as high as 1000-1200 degrees. 304 stainless steel has excellent stainless corrosion resistance and good intergranular corrosion resistance. For oxidizing acids, it was found in experiments that 304 stainless steel has strong corrosion resistance in nitric acid below the boiling temperature with a concentration of ≤65%. It also has good corrosion resistance to alkali solutions and most organic and inorganic acids. Of course, the corrosion resistance of 304 is higher than that of 201, but 304 is not the best in corrosion resistance. You'd better choose 316, a material with a high nickel content.

304 stainless steel is an austenitic stainless steel: check the "Corrosion Data and Material Selection Manual": for 100% carbonic acid, it is not corrosion resistant at 900°C, and has excellent corrosion resistance below 900°C; for carbonic acid with a concentration lower than the saturation concentration, it is not corrosion resistant. Above 100℃, the corrosion resistance is excellent.

What media is 304 resistant to and what media is not resistant to: 304 is resistant to carbonates, wet hydrogen sulfide, high temperature S corrosion, low temperature alkali liquid, low temperature acetic acid and is not resistant to halogen ions, polythionic acid, and hydrochloric acid.

Reasons affecting the corrosion resistance of 304 stainless steel plates: In terms of processing technology, the surface treatment of 304 is through strong acid and alkali cleaning and passivation, and the effect is quite good. Currently, many industries choose industrial 98% concentrated sulfuric acid and 68% or above concentrated nitric acid. Or corrosion inhibitors are more common. To judge the acidity and alkalinity of water, water is usually used as the medium and a certain proportion of acid-base solution is added. Of course, the pH range measurement is mainly a targeted discussion. The 304 stainless steel plate alone is affected by many factors including manufacturer, domestic, imported, and ingredient content. Furthermore, in terms of corrosion, pitting corrosion, local corrosion, corrosion time period, and corrosive environment may affect the original good corrosion resistance of 304.