Alloys 316Ti (1.4571) Similar to Grade 316L except that 316Ti has better high temperature strength, and mechanical strength. Used for equipment exposed to aggressive corrosive conditions and high temperature applications,including automotive flexible connectors, welded bellows, chimney liners, and flexible ducting.
Grade 316Ti stainless steel has been traditionally specified by German engineers and users with the Werkstoff number 1.4571.The former steel grade in the UK was 320S31.
The presence of titanium to 1.4571 does, however, give some improvements to mechanical strength, especially, at elevated temperatures above about 600 C. and care must therefore be exercised in selecting 1.4404 as a substitute under these conditions. The 1.4571 may however have inferior impact properties at ambient temperatures, compared to the 1.4404 / 1.4432 types.
There is also some evidence that the 1.4571 type may have inferior pitting and stress corrosion cracking resistance, compared to the 1.4404 / 1.4432 types, although the general corrosion resistance can be assumed to be generally similar. The titanium stabilized 1.4571 grade may also be prone to 'knife line attack' in the heat-affected zones of welds, very close to the fusion zone where the carbo-nitrides have redissolved in the solid steel matrix.
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