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 7.87 g/cm Imperial 3 0.284 lb/in3 Mechanical Properties The following table shows mechanical properties of cold drawn AISI 1018 carbon steel. Properties Tensile strength Saved from URL: http://www.azom.com/article.aspx?ArticleID=9138 Metric Imperial 440 MPa 63800 psi P 1 /3 Heat Treatment AISI 1018 carbon steel can be case hardened to Rc 42. Vickers (converted from Brinell hardness) 131 131 Machinability (based on AISI 1212 steel. as 100 machinability) 70 70 Thermal Properties The thermal properties of AISI 1018 carbon steel are given in the following table. Machining provides this alloy with a fine finish. Forming It is easy to form AISI 1018 carbon steel in the annealed condition.29 0.azom.aspx?ArticleID=9138 P 2 /3 . Brinell 126 126 Hardness. with continuous and hard chips. Rc 28-30 can be obtained. Properties Thermal conductivity Metric Imperial 51. Forging Forging of AISI 1018 carbon steel can take place in the range of 996-1260°C (1825-2300°F)..ft2. It is possible to machine this alloy in all conditions. In case of thicker sections of over 4 in.com/article. and submerged melt welding. but only in thin sections.AISI 1018 Carbon Steel (UNS G10180) Yield strength 370 MPa 53700 psi Modulus of elasticity 205 GPa 29700 ksi Shear modulus (typical for steel) 80 GPa 11600 ksi Poisson’s ratio 0.°F Other Designations Other designations that are equivalent to AISI 1018 carbon steel include the following. Welding AISI 1018 carbon steel can be welded using most of the conventional methods such as gas. 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.29 Elongation at break (in 50 mm) 15% 15% Hardness. oxyacetylene. Rockwell B (converted from Brinell hardness) 71 71 Hardness.9 W/mK 360 BTU in/hr. resistance. Knoop (converted from Brinell hardness) 145 145 Hardness. Saved from URL: http://www. AISI 1018 Carbon Steel (UNS G10180) Hot Working AISI 1018 carbon steel can be easily hot worked. 2013 Saved from URL: http://www. Intermediate annealing has to be performed to overcome the alloy’s tendency to work harden.aspx?ArticleID=9138 P 3 /3 . Process annealing can be done at 649°C (1200°F). Cold Working Cold working AISI 1018 carbon steel will affect the hardness and mechanical properties. The other applications of this alloy are as follows: Shafts Spindles Pins Rods Sprocket assemblies. Date Added: Jun 7. Applications AISI 1018 carbon steel is commonly used in high volume screw machine parts applications.azom. Annealing Complete annealing of this alloy can be achieved by soaking at 899°C (1650°F) followed by furnace cooling. 2013 | Updated: Jun 17.com/article.