AISI 1029 and 1030 Carbon Steels

General Characteristics of Carbon Steels 1029 and 1030

These are steels which are effectively on the boundary of low and medium carbon steels, and as such may be classified as direct-hardening grades as opposed to carburizing grades.

Applications

These grades are suitable for the manufacture of forged components that are subjected to low stresses, for automotive and general engineering.

Forging

Forging of these grades would be carried out at a temperature of around 2200ºF (1205ºC) down to 1650-1700ºF (900-925ºC.) The actual forging and finishing temperatures will depend on a number of factors, including overall reduction during forging and complexity of part being forged.
Experience alone will determine near exact values for these two parameters.
Parts are air cooled after forging.

Heat treatment

Annealing

To produce a structure suitable for machining, these grades may be annealed by austenitizing at 1550-1625ºF (845-885ºC), furnace cooling to 1200ºF (650ºC) at 50ºF (28ºC) per hour, soaking and air cooling. This will give a structure of coarse pearlite with minimum ferrite.

Normalizing

These grades would be normalized at around 1700ºF (925ºC,) and prior to tempering or to hardening and tempering.

Hardening

These grades would be austenitized at 1550-1600ºF (845-870ºC) and water quenched.

Tempering

Tempering would be carried out at temperatures based on past experience, to provide the required mechanical properties.

Machinability

Best machinability is obtained on these grades following an annealing treatment that will give a microstructure of coarse pearlite with minimum ferrite. See annealing above.

Weldability

Welding of these grades may be carried out by all normal fusion methods, preferably using low-carbon electrodes.

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