Glenn Posted September 1, 2018 Share Posted September 1, 2018 Originally posted by jlpservices in another thread. 1018 comes in both Cold rolled (CR) and hot rolled (HR).. CR has a high tensile strength than HR it also works a little bit differently even when hot.. CR comes in 12ft lengths and HR comes in 20ft lengths.. CR usually costs more than HR.. A36 here usually fills the Niche sizing types.. 1018 is much more forgiving to heat cycling and improper forging techniques vs A36.. It also forge welds at a different temperature.. Introduction AISI 1018 mild/low carbon steel has excellent weldability and produces a uniform and harder case and it is considered as the best steel for carburized parts. AISI 1018 mild/low carbon steel offers a good balance of toughness, strength and ductility. Provided with higher mechanical properties, AISI 1018 hot rolled steel also includes improved machining characteristics and Brinell hardness. Specific manufacturing controls are used for surface preparation, chemical composition, rolling and heating processes. All these processes develop a supreme quality product that are suited to fabrication processes such as welding, forging, drilling, machining, cold drawing and heat treating. Chemical Composition Element Content Carbon, C 0.14 - 0.20 % Iron, Fe 98.81 - 99.26 % (as remainder) Manganese, Mn 0.60 - 0.90 % Phosphorous, P ≤ 0.040 % Sulfur, S ≤ 0.050 % Physical Properties Physical Properties Metric Imperial Density 7.87 g/cc 0.284 lb/in3 Mechanical Properties Mechanical Properties Metric Imperial 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 Tensile Strength, Ultimate 440 MPa 63800 psi Tensile Strength, Yield 370 MPa 53700 psi Elongation at Break (In 50 mm) 15.0 % 15.0 % Reduction of Area 40.0 % 40.0 % Modulus of Elasticity (Typical for steel) 205 GPa 29700 ksi Bulk Modulus (Typical for steel) 140 GPa 20300 ksi Poissons Ratio (Typical For Steel) 0.290 0.290 Machinability (Based on AISI 1212 steel. as 100% machinability) 70 % 70 % Shear Modulus (Typical for steel) 80.0 GPa 11600 ksi Electrical Properties Electrical Properties Metric English Comments Electrical resistivity @0°C (32°F) 0.0000159 Ω-cm 0.0000159 Ω-cm annealed condition @100 °C/ 212 °F 0.0000219 Ω-cm 0.0000219 Ω-cm annealed condition @ 200 °C/392 °F 0.0000293 Ω-cm 0.0000293 Ω-cm annealed condition Machining Related Stories High Strength Steel AISI 1018 Carbon Steel (UNS G10180) Comprehensive Market Research Report on US Steel Industry The machinability of AISI 1018 mild/low carbon steel is graded at 78% of B1112. Weldability AISI 1018 mild/low carbon steel can be instantly welded by all the conventional welding processes. A36: Introduction ASTM A36 is the most commonly used mild and hot-rolled steel. It has excellent welding properties and is suitable for grinding, punching, tapping, drilling and machining processes. Yield strength of ASTM A36 is less than that of cold roll C1018, thus enabling ASTM A36 to bend more readily than C1018. Normally, larger diameters in ASTM A36 are not produced since C1018 hot roll rounds are used. ASTM A36 is usually available in the following forms: Rectangle bar Square bar Circular rod Steel shapes such as channels, angles, H-beams and I-beams. Chemical Composition Element Content Carbon, C 0.25 - 0.290 % Copper, Cu 0.20 % Iron, Fe 98.0 % Manganese, Mn 1.03 % Phosphorous, P 0.040 % Silicon, Si 0.280 % Sulfur, S 0.050 % Physical Properties Physical Properties Metric Imperial Density 7.85 g/cm3 0.284 lb/in3 Mechanical Properties Mechanical Properties Metric Imperial Tensile Strength, Ultimate 400 - 550 MPa 58000 - 79800 psi Tensile Strength, Yield 250 MPa 36300 psi Elongation at Break (in 200 mm) 20.0 % 20.0 % Elongation at Break (in 50 mm) 23.0 % 23.0 % Modulus of Elasticity 200 GPa 29000 ksi Bulk Modulus (typical for steel) 140 GPa 20300 ksi Poissons Ratio 0.260 0.260 Shear Modulus 79.3 GPa 11500 ksi Machining Related Stories High Strength Steel Titanium Alloys - Ti3Al2.5V Grade 9 and Grade 18 Comprehensive Market Research Report on US Steel Industry The machinability rate of ASTM A36 is estimated to be 72%, and the average surface cutting feed of ASTM A36 is 120 ft/min. Machining of ASTM A36 steel is not as easy as that of AISI 1018 steel. Welding ASTM A36 steel is easy to weld using any type of welding methods, and the welds and joints so formed are of excellent quality. Heat Treatment Any standard carburizing and hardening methods of AISI 1018 steel is suitable for ASTM A36. Quote Link to comment Share on other sites More sharing options...
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