ttt diagram for S5

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the firewall here won't allow me uploading photos.

ac1 715C, ac3 785C.

you have way more than 15 seconds to avoid pearlite nose, more likely 40~50seconds. Thin plate can be hardened with forced N2 or forced air. Ms will settle between 260~270C, depends on the austenize temperature, quenching speed, media and steel itself...but its no big deal. bainite can still be achieved by holding it below Ms, arround 240C or even lower.

i think 59hrc for a sword might not be the best idea. i broke a long sword made of s5 not too long ago by several big swing against an anvil(simlar like swing a baseball bat). if you are not so determined with Hardness, you can try aermet100. at hrc 54 it unbreakable with c notched impact test. bend but didn't break. charpy v notched mesured 60j. did same swing test against anvil, blade notched badly but couldn't break it. cracked the blade by holding it with a vise then hammer smash it to 90 degree, then hammer it back and finally broke the blade.
 
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also sometimes if not most of time, you will get s5 made in russia and china. US companys offen order s5 in bulk and demands 0.5~0.55%c instead of aisi standard 0.6%c. So you may find rc0.5~1 lower on hardness.
 
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