AISI 1040 carbon steel is an EN8 steel equivalent that has high carbon content and can be hardened by heat treatment followed by quenching and tempering to achieve 150 to 250 ksi tensile strength. Specifically, it is equivalent to EN8/080M40. It is a medium-strength steel with adequate tensile strength.
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This EN8 steel equivalent has a slightly higher manganese and carbon content than AISI 120 carbon steel. Aside from its superior strength, AISI 1040 also possesses good ductility.
The following table shows the chemical composition of AISI 1040 carbon steel.
The physical properties of AISI 1040 carbon steel are tabulated below.
The mechanical properties of AISI 1040 carbon steel are outlined in the following table.
The thermal properties of AISI 1040 carbon steel are given in the following table.
Other designations that are equivalent to AISI 1040 carbon steel include:
The machinability rating of AISI 1040 carbon steel is 60.
AISI 1040 carbon steel can be formed in the annealed condition.
AISI 1040 carbon steel can be welded using all standard welding techniques. It can be pre-heated at 149 to 260°C (300 to 500°F) and post-heated at 594 to 649°C (1100 to 1200°F) due to its high carbon content. Pre-heating and post-heating is recommended for heavy sections.
AISI 1040 carbon steel can be heat treated at 844 to 899°C (1550 to 1650°F) followed by quenching in water and tempering. However, tempering and quenching are commonly not cost-effective for AISI 1040 carbon steel.
AISI 1040 carbon steel can be forged at 982 to 1260°C (1800 to 2300°F).
AISI 1040 carbon steel can be hot worked from 94 to 483°C (200 to 900°F ).
AISI 1040 carbon steel can be cold worked in the annealed state using conventional methods.
AISI 1040 carbon steel can be annealed at temperatures ranging from 872 to 983°C (1600 to 1800°F). It can then be slowly cooled in the furnace. Stress relief annealing process can be performed at a temperature of about 594°C (1100°F). Normalizing treatment can also be performed at 899°C (1650°F) followed by slow cooling.
AISI 1040 carbon steel can be tempered at 316 to 705°C (600 to 1300°F) based on the desired strength.
AISI 1040 carbon steel can be hardened by performing cold working process.
AISI 1040 carbon steel is used for a number of key industrial applications. It is typically supplied in several forms, including sheets, square and round bars, strips, and plates.
It is used in structural applications which require moderate strength. This includes cold-formed bolts and fasteners. Commonly, AISI 1040 carbon steel is used in its case-hardened condition. It is also used in couplings, cold-headed parts, and crankshafts.
AISI 1040 carbon steel is an EN8 equivalent steel that contains moderate amounts of carbon and manganese. It is used in applications such as crankshafts, structural elements, and a range of parts that benefit from its heat-treated properties. It can be annealed, normalized, case-hardened, tempered, and welded.
This carbon steel type is typically commercially supplied in forms such as sheets, strips, plates, wires, pipes, and many other forms. It possesses beneficial physical properties such as good tensile strength, yield strength, and ductility, which makes it ideal for its many industrial applications. This steel has many different designations depending upon the specific standards.
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