Carbon Steel 1055

Chemical Analysis
C Carbon
0.50– 0.60
Mn Manganese
0.60– 0.90 max
P Phosphorus
0.040 max
S Sulfur
0.050 max

General characteristics of Carbon Steel 1055

This steel is used in applications where high strength and toughness are not major requirements.


This medium carbon steel is used for components of small cross section requiring low tensile strength, and heavy forgings in the normalized condition for automotive and general engineering such as axles, clutch members, shafts, pressed and punched parts, piston rods and gear racks.


This steel is forged between 2200 and 1700ºF (1205 and 925ºC.) After forging the steel could be transferred to a furnace held at roughly the forging finishing temperature, as a preliminary to an annealing cycle.

Heat treatment


As mentioned above, forgings may be transferred to a furnace at a temperature that may approximate to the forging finishing temperature. The full annealing cycle of this grade is a soak at a temperature of 1450-1600ºF (790-870ºC) cooling to 1200ºF (650ºC) at 50ºF (28ºC) per hour, soaking and subsequently air cooling.


This steel will on occasion require normalizing prior to further heat treatment such as hardening and tempering. This is carried out at a temperature of 1650ºF (900ºC) followed by air cooling.


This steel is austenitized at 1475-1550ºF (800-845ºC) followed by water or oil quench depending upon section size and complexity.


This steel will be tempered at a temperature to give required mechanical properties, based on past experience. It should be noted that there is a danger of temper brittleness in the temperature range of 500-600ºF (260-315ºC.)


Optimum machinability is obtained from a coarse lamellar pearlite to coarse spheroidite structure.


In the event that welding is a requirement, constant preheating and post-weld stress relief should be employed.

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