A36 vs 1018 Mild (low-carbon) steel

Alloy 1018 is the most commonly available of the cold-rolled steels. It is generally available in round rod, square bar, and rectangle bar. It has a good combination of all of the typical traits of steel - strength, some ductility, and comparative ease of machining. Chemically, it is very similar to A36 Hot Rolled steel, but the cold rolling process creates a better surface finish and better properties.

1018 Mild (low-carbon) steel

Minimum Properties
Ultimate Tensile Strength, psi 63,800
Yield Strength, psi 53,700
Elongation 15.0%
Rockwell Hardness B71

1018 Mild (low-carbon) steel Chemistry

Iron (Fe) 98.81 - 99.26%
Carbon © 0.18%
Manganese (Mn) 0.6 - 0.9%
Phosphorus (P) 0.04% max
Sulfur (S) 0.05% max

A36 Mild Steel

ASTM A36 steel is the most commonly available of the hot-rolled steels. It is generally available in round rod, square bar, rectangle bar, as well as steel shapes such as I-Beams, H-beams, angles, and channels. The hot roll process means that the surface on this steel will be somewhat rough. Note that its yield strength is also significantly less than 1018 - this means that it will bend much more quickly than will 1018. Finally, machining this material is noticeably more difficult than 1018 steel, but the cost is usually significantly lower.

ASTM A36 Mild (low-carbon) steel Minimum Properties

Ultimate Tensile Strength, psi 58,000 - 79,800
Yield Strength, psi 36,300
Elongation 20.0%

A36 Mild Steel Chemistry

Iron (Fe) 99%
Carbon © 0.26%
Manganese (Mn) 0.75%
Copper (Cu) 0.2%
Phosphorus (P) 0.04% max
Sulfur (S) 0.05% max
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