| 摘要 |
FIELD: metallurgy. SUBSTANCE: method involves manufacture of steel blank of a part, its treatment by cementation or carbonitridation (cyanidation), optionally at high temperature, steel is composed, wt.%: carbon, 0.15-0.35; silicon, at most 0.6; sum of manganese, chromium, and molybdenum, at most 5.0; aluminum, at most 0.1; copper, at most 0.5; sulfur, at most 0.15; phosphorus, at most 0.03; and optionally up to: tellurium, 0.02; selenium, 0.04; lead, 0.07; and calcium, 0.005; iron, the balance. Jominy hardenability for said steel should meet following conditions: 45HRC <=J3<= 50HRC, 39HRC <=J11<= 47HRC, 31HRC <=J25<= 40HRC. Average values J3av, J11av, J15av, and J25av of five Jominy bars must satisfy following conditions: |J11av-J3av.14/22-J25av.8/22|<= 2.5HRC, J3av-J15av<= 9HRC. EFFECT: enabled manufacture of steel parts without deformation and hogging upon tempering after high-temperature cementation or carbonitridation. 15 cl, 4 tbl, 6 ex
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