Using the figure below which plots Rockwell hardness versus logarithm tempering

Question

Using the figure below which plots Rockwell hardness versus logarithm tempering time for a 1080 steel that has been water quenched, determine:
(a) the tempering time at 425?C (800?F) to achieve a hardness of 50 HRC

I already tried 500 and 800,but those were wrong answers. I have only one attempt and cannot get grade if the answer is wrong. Plz help!

(a) about s Using the figure below which plots Rockwell hardness versus logarithm tempering time for a 1080 steel that has been water quenched, determine: (a) the tempering time at 425?C (800?F) to achieve a hardness of 50 HRC Entry field with incorrect answer s I already tried 500 and 800,but those were wrong answers. I have only one attempt and cannot get grade if the answer is wrong. Plz help!

Explanation / Answer

the answer is 450s!!!!!

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