Q: I am designing an engine unit and am considering using 1.4980 stud bolts and nuts at elevated temperature. What is the maximum working temperature for stud bolts made of 1.4980 (A-286)?

A: A286/Alloy 660 or 1.4980 fasteners are made of a stainless steel alloy which contains iron, nickel, and chromium. 1.4980 bolts offer high strength, creep resistance, and oxidation resistance at elevated temperatures in age hardened condition. In general 1.4980 bolts can be used from room temperature up to 700 deg. C (1300 deg F)

As for all metals, the material strength for 1.4980 fasteners, will reduce when temperature increases. At 700 deg C the strength of 1.4980 will typically be 40% lower compared to room temperature. The following charts can help you better understand the strength of 1.4980/A286 bolts at different temperatures.

Q: What is the corrosion (oxidation) resistance of 1.4980 (A-286) fasteners compared to 1.4404 (A4 / 316L ) fasteners?

A:  A286 / 1.4980 bolts provide excellent oxidation resistance up to 1500°F (815°C). This makes 1.4980 bolts ideal for high temperature exhaust streams. In comparison, 316L / 1.4404 bolts can typically be applied up to approximately 550°C  – almost 300°C less than A286.

Known for its high temperature strength, the main advantage of  A286 / 1.4980 bolts compared to 316L/1.440 their mechanical properties in heat. A86 is able to maintain higher strength at elevated temperatures. In general 1.4980 bolts offer good mechanical behavior up to 700 deg. C (1500 deg F)