410S (UNS S41008) Stainless Steel

410S (UNS S41008) Stainless Steel

410S (UNS S41008) Stainless Steel General Properties Alloy 410S (UNS S41008) is a low carbon, non–hardening modification of Alloy 410 (UNS S41000) the general purpose 12% chromium martensitic stainless steel. The low carbon and a small alloy addition minimize austenite formation at high...
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410S (UNS S41008) Stainless Steel

General Properties

Alloy 410S (UNS S41008) is a low carbon, non–hardening modification of Alloy 410 (UNS S41000) the general purpose 12% chromium martensitic stainless steel. The low carbon and a small alloy addition minimize austenite formation at high temperatures which restricts the alloys ability to harden. 


Applications

  • Petroleum Refining and Petrochemical Processing

    • Columns

    • Distillation trays

    • Heat exchangers

    • Towers

  • Ore Processing

    • Mining machinery

  • Thermal Processing

    • Annealing boxes

    • Partitions

    • Quenching racks

  • Gate valves

  • Press plates


Standards

  • ASTM: A 240

  • ASME: SA 240


Heat Treatment

The alloy can not be hardened by heat treatment. It is annealed between 1600 – 1650°F (871 – 899°C), and then air cooled to relieve cold working stresses. 410S should not be exposed to temperatures above 2000°F (1093°C), due to embrittlement. If large grains are found after annealing mildly cold-worked material, the annealing temperature should be decreased to 1200 – 1350°F (649 – 732°C).


Welding

410S is generally considered to be weldable by the common fusion and resistance techniques. Special attention should be given to avoid brittle weld fractures during fabrication; this includes minimizing discontinuities, maintaining low weld heat input, and occasionally warming the part somewhat before forming. 410S is generally considered to have slightly poorer weldability than the most common ferritic stainless steel grade 409. A major difference can be attributed to the addition of alloy, to control hardening which results in the need for higher heat input during welding.


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