Heat Treatment Basket
Courtesy of NeoNickel
Fasteners for Furnace Linings
Courtesy of Hague Fasteners
310 is the “workhorse” high temperature steel. Its fully austenitic structure allows it to double as a non-magnetic stainless steel at normal temperatures.
Approximate Composition – 25% Cr 20% Ni (Exact composition ranges vary between EN and ASTM standards).
This grade combines the following characteristics:
• Excellent oxidation resistance to 1050°C
• Good carburisation resistance
• Good sulphidation resistance
• Good resistance to molten metals
• Low magnetic permeability
310 is the most common grade of heat resistant stainless steel. It is the most likely heat resistant grade to be stocked in a wide range of product forms and will cope with a wide range of high temperature conditions. The high Cr (25%) contributes to the general “strength” of the passive layer. The high Ni (20%) reduces the differential in thermal expansion between the passive layer and the base metal, thereby increasing resistance to spalling in thermal cycling conditions.
The high Ni content leads to a fully austenitic structure which gives a very low magnetic response. The high alloy content also gives a high resistance to martensite formation on cold working. Therefore, 310 is also used in specialised non-magnetic applications. It is more widely available than the “correct” non-magnetic grades like 304LN and 316LN.
Applications which illustrate these features include:
Heat treatment furnaces and accessories, power generation, cement production, burners, metal sintering, waste incineration, refractory anchors, glass making, scientific instruments.