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closeup calcining hot metal steel gear parts in a factory induction furnace with smoke Girl with bikini and a watch in frozen lake ice hole. Woman hardening the body in cold water. Good immunity is protection against many diseases. Vintage color filter Cooling of metal part with liquid. Technological process Winter swimming. 50-year-old woman in a hole in a frozen lake. Recovery and extreme swimmers in ice water. hardening youth .Place for text Metal hardening furnace. The door is open, ready to load metal parts. DIY home made metal hardening with gas cutting torch Industrial furnace in workshop of a forging plant for hardening steel at high temperature. Blacksmith and metallurgical industry, steelmaking, hot rolling mill. Heat treating. Shop in steel factory Red hot parts in an electric furnace for hardening metal. Hardening of metal parts at the valve manufacturing plant. Dangerous work, close up Privilege Escalation Testing: Ethical hackers check for vulnerabilities in systems that could allow attackers to gain higher-level access and control illicitly.
Surface hardening of steel. Induction hardening type of surface hardening . Metal part is induction-heated and then quenched. Quenched metal. Induction heating  process. Electromagnetic induction. Swimming in cold mountain lake hardening of steel components in a foundry - red-hot components come out of the oven