Amagnit 501 is specifically designed for extreme service. This chrome manganese, low carbon austenitic alloy ensures non-magnetic steel which is resistant to stress corrosion cracking and provides superior mechanical properties with low magnetic permeability, excellent machineability and no tendency for galling. Consistent non-magnetic behavior is essential in this special alloy steel as well as material that is free of hot spots. These non-magnetic characteristics of Amagnit 501 are certified by Vallourec Drilling Products upon delivery for the life of the product.
Laboratory tests and actual field use confirm that Amagnit 501 provides very good resistance to stress corrosion cracking in an aggressive chloride environment.
The metallurgical and material integrity of Amagnit 501 is achieved by careful raw material selection, closely controlled remelting procedures and efficient forging. Exact time –temperature – forging cycles are achieved on a high speed, high precision rotary forge.
The melting technology and warm forging process used in making Amagnit 501 alloy eliminate the precipitation of carbides on grain boundaries, thus producing a non- sensitized microstructure. This is achieved through the rigorous selection of the time/ temperature / force cycle used during the warm-working process.
Amagnit 501 was exposed to proprietary test methods of a major directional drilling company (U-bend, C-ring, etc) and out-performed competitive grades. A detailed report of the test results is available on request.
The ultimate performance of the Amagnit 501 depends as much on Quality Assurance and Quality Control as on its patented chemistry and forging process. In addition, systematic stress corrosion tests on each bar provide constant correlation between its actual chemistry force-time-temperature cycles and its corrosion resistance.