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Carbon Steel 1040 - Essay Example

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The paper "Carbon Steel 1040" tells us about 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…
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Carbon Steel 1040
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Extract of sample "Carbon Steel 1040"

Carbon Steel 1040 is engineering medium-carbon steel useful for induction hardening or flame. The mechanical properties of Carbon Steels 1040 are suitable for a variety of applications as it is a versatile material for forging. Using correct procedures, Carbon Steel 1040 can be machined and readily welded.

55 large mills produce Carbon Steels 1040 and it is stocked by 27 distributors from North America (“Carbon Steels 1040”). While the mills usually just sell Carbon Steels 1040 in large quantities, small-quantity purchases are offered by the distributors. The delivery times taken by the mills range between 10 and 50 weeks after the placement of the order depending upon the form and size of steel required. Carbon Steels 1040 is primarily stocked by 12 distributors in Bar Products, though it is also, to some extent, available in tubular products, wire products, fasteners, forging products, and flat rolled products.

The principle design feature of Carbon Steels 1040 includes its higher carbon content i.e. 0.4 percent which lends it more strength as compared to the lower alloys of carbon (“Carbon Steels 1040”). Carbon Steels 1040 are given heat treatment to make them hard. They are quenched and tempered so that a tensile strength from 150 ksi to 250 ksi can be developed in them (“Carbon Steels 1040”).

It has good machinability since it is rated at 60 percent machinability given by the 1112 alloy that is employed as 100 percent rated steel for machining (“Carbon Steels 1040”). Carbon Steels 1040 forming gets quickly accomplished in the annealed condition. It can be welded using any method of welding. However, its higher content of carbon imparts the need to use pre-heat and post-heat practice at 300 to 500 F and 1100 to 1200 F respectively according to a verified procedure of welding. Carbon Steels 1040 shows a good response to the hardening at 1550 to 1650 F achieved by heat treatment when the heating is followed by water quenching as well as tempering (“Carbon Steels 1040”). This helps attain the desired level of strength in the steel.

One problem with Carbon Steels 1040 is that the higher carbon content makes it very brittle and hard. Increased carbon affects the temperature where the forming of martensite commences (see Fig. 1.). At lower temperatures, steel is less plastic and not very capable of accommodating the changes in volume linked with the changing to martensite. Increased brittleness in the steel subjects it to cracking and distortion. However, increased concentration on materials that are very hard and stiff is a trend that is likely to increase in the future. Carbon Steel 1040 is suitable for use in forged parts with materials that have appropriate toughness and strength (“Alloy information for”). It is appropriate for use in the making of forged couplings and crankshafts. Carbon Steels 1040 are also used for making cold-headed components that have a variety of applications.

Fig. 1. Carbon content impact on Ms temperature for carbon steel (“Steel Casting Handbook” 16).

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