ATI Steel ATI 439 HP™
The composition of ATI 439™ stainless steel has been balanced to provide a completely ferritic structure at all temperatures, to avoid the loss of ductility after welding and to provide resistance to intergranular corrosion. Similar ferritic stainless steels such as ATI 430 and ATI 434 alloys are susceptible to brittle martensite formation after welding and to intergranular corrosion sensitivity in the as-welded condition. ATI 439™ alloy does not require annealing after welding to restore ductility or to provide intergranular corrosion resistance.
Excellent resistance to stress corrosion cracking, good weldability, high thermal conductivity and low thermal expansion characteristics make ATI 439™ stainless steel an ideal consideration for many applications. For shell and tube heat exchangers where carbon steel shells are used with ATI 439™ tubes, the close match of thermal expansion coefficients may possibly eliminate the need for an expansion joint in the heat exchanger. ATI 439™ alloy has a low cobalt content, compared to Type 304, making it an attractive consideration for nuclear applications.
When aplication temperatures are too high for ATI 409 alloy, ATI 439™ alloy provides good oxidation and corrosion resistance for many automotive exhaust system components and residential furnace primary heat exchangers.
ATI Allegheny Ludlum currently supplies only an improved formability version of this alloy, known as ATI 439HP™. This is especially beneficial for the severe tube bending required for automotive exhaust manifolds.
General Properties
Access the complete datasheet details for ATI Steel ATI 439 HP™ when you create your free account with Prospector. You’ll find complete information on physical, mechanical and hardness specs.
Technical Datasheet (English)
Download DocumentProcessing
Find specific processing information for ATI Steel as well as general information for the Steel - Wrought - Stainless - Ferritic generic family. Register or Sign In for more information.
Where To Buy
You can purchase ATI Steel ATI 439 HP™ from 1 distributors or manufacturers. Register or Sign In for more information.
PROSPECTOR
Find solutions, not just materials.
When you join Prospector, you leverage the dynamic tools and features to find solutions fast.
Register Today