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AISI 1018 Carbon Steel (UNS G10180)
AISI 1018 Carbon Steel (UNS G10180) Topics Covered Introduction Chemical Composition Physical Properties Mechanical Properties Thermal Properties Other Designations Fabrication and Heat Treatment Machinability Forming Welding Heat Treatment Forging Hot Working Cold Working Annealing Applications
Introduction There are many different categories of steel, and carbon steels are one such category that contains 0.12 to 2% carbon in them. The steel gains hardness and strength with heat treatment when the carbon percentage content increases; however its ductility is reduced. AISI 1018 carbon steel is a free machining grade that is the most commonly available grade around the world. Although its mechanical properties are not very unique, it still can be easily formed, machined, welded and fabricated. The following sections will discuss in detail about AISI 1018 carbon steel.
Chemical Composition The chemical composition of AISI 1018 carbon steel is outlined in the following table. Element
Content (%)
Manganese, Mn
0.60-0.90
Carbon, C
0.15-0.20
Sulfur, S
0.05 (max)
Phosphorous, P
0.04 (max)
Iron, Fe
Balance
Physical Properties The physical properties of AISI 1018 carbon steel are tabulated below. Properties Density
Metric
Imperial
7.87 g/cm3
0.284 lb/in3
Mechanical Properties The following table shows mechanical properties of cold drawn AISI 1018 carbon steel. Properties Tensile strength
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Metric
Imperial
440 MPa
63800 psi
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AISI 1018 Carbon Steel (UNS G10180)
Yield strength
370 MPa
53700 psi
Modulus of elasticity
205 GPa
29700 ksi
80 GPa
11600 ksi
Poisson’s ratio
0.29
0.29
Elongation at break (in 50 mm)
15%
15%
Hardness, Brinell
126
126
Hardness, Knoop (converted from Brinell hardness)
145
145
Hardness, Rockwell B (converted from Brinell hardness)
71
71
Hardness, Vickers (converted from Brinell hardness)
131
131
Machinability (based on AISI 1212 steel. as 100 machinability)
70
70
Shear modulus (typical for steel)
Thermal Properties The thermal properties of AISI 1018 carbon steel are given in the following table. Properties Thermal conductivity
Metric
Imperial
51.9 W/mK
360 BTU in/hr.ft2.°F
Other Designations Other designations that are equivalent to AI SI 1018 carbon steel include the following. AMS 5069
ASTM A29
ASTM A512
ASTM A611 (D-1)
ASTM A635
AMS 5069A
ASTM A510
ASTM A794
ASTM A519
ASTM A544
ASTM A108
ASTM A513
ASTM A830
ASTM A545
ASTM A548
ASTM A549
ASTM A659
SAE J412
SAE J1397
MIL S-11310 (CS 1018)
ASTM A576
SAE J403
SAE J414
MIL J-1397
MIL J-403
MIL J-412
Fabrication and Heat Treatment Machinability AISI 1018 carbon steel is rated at 62% of AISI 1112 carbon steel. Machining provides this alloy with a fine finish, with continuous and hard chips. It is possible to machine this alloy in all conditions.
Forming It is easy to form AISI 1018 carbon steel in the annealed condition.
Welding AISI 1018 carbon steel can be welded using most of the conventional methods such as gas, oxyacetylene, resistance, and submerged melt welding.
Heat Treatment AISI 1018 carbon steel can be case hardened to Rc 42, but only in thin sections. In case of thicker s ections of over 4 in., Rc 28-30 can be obtained.
Forging Forging of AISI 1018 carbon steel can take place in the range of 996-1260°C (1825-2300°F).
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AISI 1018 Carbon Steel (UNS G10180)
Hot Working AISI 1018 carbon steel can be easily hot worked.
Cold Working Cold working AISI 1018 carbon steel will affect the hardness and mechanical properties. Intermediate annealing has to be performed to overcome the alloy’s tendency to work harden.
Annealing Complete annealing of this alloy can be achieved by soaking at 899°C (1650°F) followed by furnace cooling. Process annealing can be done at 649°C (1200°F).
Applications AISI 1018 carbon steel is commonly used in high volume screw machine parts applications. The other applications of this alloy are as follows: Shafts Spindles Pins Rods Sprocket assemblies.
Date Added: Jun 7, 2013 | Updated: Jun 17, 2013
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