Between 121-137 on the Brinell hardness scale - which is quite soft. The end parts are generally case-hardened before use to 60+ Rockwell "C".
28-30 after heat treat
Its IS226 for structural steel & IS2062 for fusion weldable structural steel.
AISI 1018 is usual quality structural grade A216 Gr WCB is Steel Castings, Carbon, Suitable for Fusion Welding, for High- Temperature Service
IRON
the main reason might be that the percentage of carbon increase the hardness of material (steel ) and ductility would decrease
* Mild (low carbon) steel: approximately 0.05-0.15% carbon content for low carbon steel and 0.16-0.29% carbon content for mild steel (e.g. AISI 1018 steel). Mild steel has a relatively low tensile strength, but it is cheap and malleable; surface hardness can be increased through carburizing. * Medium carbon steel: approximately 0.30-0.59% carbon content(e.g. AISI 1040 steel). Balances ductility and strength and has good wear resistance; used for large parts, forging and automotive components. * High carbon steel: approximately 0.6-0.99% carbon content. Very strong, used for springs and high-strength wires. * Ultra-high carbon steel: approximately 1.0-2.0% carbon content. Steels that can be tempered to great hardness. Used for special purposes like (non-industrial-purpose) knives, axles or punches. Most steels with more than 1.2% carbon content are made using powder metallurgy and usually fall in the category of high alloy carbon steels.
In a lab experiment, I found the hardness of a sample of C-1018 Annealed carbon steel to be 73.58 (averaged over 6 runs) on the HRB scale.
Rockwell Hardness of steel 1018 ranges from 71 to 78 converted from Brinell hardness. The difference from 71 to 78 is caused by manufacturing metods and/or purity of the alloy. The corresponding test for 1018 is RHB wich must be done using 1/16 a ball penetrator.
1018 is the number "one thousand and eighteen."It is also the name for 1018 steel which is the most common low-carbon mild steel alloy in many uses, including structural steel.
Hardness - when carbon is added to steel, the hardness is increased
Carbon. as steel is a composition of iron with carbon and other elements such as nickel
Its IS226 for structural steel & IS2062 for fusion weldable structural steel.
AISI 1018 is usual quality structural grade A216 Gr WCB is Steel Castings, Carbon, Suitable for Fusion Welding, for High- Temperature Service
Hardness of metal is determined by the carbon content. HRC is the Rockwell Hardness Scale. A hardness of 55-58 is not very hard compared to carbon steel.
IRON
the main reason might be that the percentage of carbon increase the hardness of material (steel ) and ductility would decrease
B4A72A is an old General Electric designation for a low carbon hot rolled plate steel grade similar in composition to AISI 1015 or 1018.
* Mild (low carbon) steel: approximately 0.05-0.15% carbon content for low carbon steel and 0.16-0.29% carbon content for mild steel (e.g. AISI 1018 steel). Mild steel has a relatively low tensile strength, but it is cheap and malleable; surface hardness can be increased through carburizing. * Medium carbon steel: approximately 0.30-0.59% carbon content(e.g. AISI 1040 steel). Balances ductility and strength and has good wear resistance; used for large parts, forging and automotive components. * High carbon steel: approximately 0.6-0.99% carbon content. Very strong, used for springs and high-strength wires. * Ultra-high carbon steel: approximately 1.0-2.0% carbon content. Steels that can be tempered to great hardness. Used for special purposes like (non-industrial-purpose) knives, axles or punches. Most steels with more than 1.2% carbon content are made using powder metallurgy and usually fall in the category of high alloy carbon steels.