MACHINABILITY OF H-11 STEEL IN THE AS-FORGED AND HEAT TREATED CONDITIONS.
MCDONNELL AIRCRAFT CORP ST LOUIS MO
Pagination or Media Count:
The Systems Laboratory of McDonnell Aircraft Corporation conducted producibility tests on machining large H-11 steel parts. This material is readily heat treated to strength levels in the 220,000 to 240,000 psi level so machinability tests were conducted on H-11 steel in both the annealed and heat treated conditions. One test specimen was machined to finished shape, then tested to determine the extent of fixturing necessary to prevent distortion during heat treatment. The test results showed H-11 steel to be readily machinable in the annealed conditions, and well adapted to heat treatment in existing facilities, if properly supported by strain relief fixturing. While H-11 steel can be machined in the heat treated conditions, tool life and metal removal rates are very poor. Author