STAINLESS STEEL PRODUCTS

The 309S types have a lower nickel content compared to the 310S types and this improves their resistance to hydrogen sulphide (H2S) attack at high temperatures.

The 309S types are low carbon grades and are recommended for applications where sensitisation and subsequent corrosion by high temperature gasses or condensates during shutdown may pose a problem.

The 309S types are used, for example, in applications such as furnace parts, fire box sheets, high temperature containers, catalytic converters, exhaust systems, etc.

The 310S types have higher chromium and nickel contents to enable them to resist oxidation in continuous service at temperatures up to 1 200°C provided reducing sulphur gases are not present. The higher silicon content in 310S Si-1.4841 improves this oxidiation resistance even further.

In intermittent high temperature service, the 310S types can be used at temperatures up to 1 030°C as they resist scaling and have a relatively low coefficient of expansion differential between the metal and the scale. These stainless steels have superior resistance to both the 304 types and the 309S types in carburising and reducing environments.

The 310S types are used in applications such as furnace parts, muffles, radiant tubes, ammonia converters, etc.