Carbon Steel 1070
0.60– 0.90 max
General characteristics of Carbon Steel 1070
Carbon steel 1070 is a general purpose engineering steel used where a fairly high strength is required.
This higher carbon steel is used for forged components in the automotive and other industries for parts where a somewhat higher strength is required. It may also be used for automotive spring manufacture, and for other applications where abrasion resistance is a requirement.
This steel would be forged between 2150 and 1700ºF (1175 and 925ºC.) After forging the steel might be transferred to a furnace held at roughly the forging finishing temperature, as a preliminary to an annealing cycle.
This steel is annealed at a temperature from 1450-1550ºF (790-840ºC), furnace cooled at around 50ºF (28ºC) per hour to 1200ºF (650ºC) soaked and air cooled. This will give a structure of fine to coarse spheroidite, a structure for optimum machinability.
This steel is normalized at a nominal temperature of 1650ºF (900ºC), followed by air cooling.
The steel is austenitized at 1475-1550ºF (800-845ºC) and will be water or oil quenched following this heat treatment, depending upon section size and complexity.
Parts will be tempered at an appropriate temperature, based on experience, coincident with property requirements.
Optimum machinability is obtained from a coarse to fine spheroidite structure.
In the event that welding is a requirement, constant preheating and post-weld stress relief should be employed.
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