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число твёрдости по Роквеллу
stresses
chem.
Rockwellhärte
f
met.work.
Rockwell-Härtezahl
n
(HR)
;
Rockwell-Härtezahl HRa
(шкала А (В, С), А — Kegel, Р = 60 kg; В = Kugel, P=100kg; С = Kegel, Р = 150 kg)
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