St35.8 is a German standard (DIN 17175) for seamless carbon steel boiler tubes used for high-pressure service.

 

 

The chemical composition of St35.8 steel typically includes the following elements:

- Carbon (C): 0.17% max

- Silicon (Si): 0.10-0.35%

- Manganese (Mn): 0.40-0.80%

- Phosphorus (P): 0.040% max

- Sulfur (S): 0.040% max

 

Additionally, it may contain trace amounts of other elements, but the above are the main constituents. The material is characterized by good mechanical properties and is suitable for high-temperature applications.

 

 

As for equivalent grades, St35.8 is similar to ASTM A179, EN 10216-2 P235GH, and JIS G3454 STPG370. These grades are used in various industrial applications, and they have similar chemical and mechanical properties, making them interchangeable in certain cases. However, its always advisable to check specific material requirements and standards for the intended application to ensure proper suitability.