A set of standards established by the American Society for Metals (ASM) determines the content of metal grades in addition to their nomenclature. MetallurgyAs an alloy consisting primarily of iron, the small quantities of metal added to that iron are what determines the differences in strength among various grades of steel.
As for whether a billet crank is stronger than a forging, because there is no consensus in the industry, the various manufacturers will duke it out later in the story and we'll let you make the call.
Custom one-offs carry price tags in the neighborhood of $3,000. Instead of twisting and pounding the metal in different directions as with a forging, a billet crank is made by whittling away the metal so the grain structure runs parallel throughout the entire length of the crank." Due to the increase in materials and labor over a forged crank, billet cranks are the most expensive of them all. "The metal bar used in a billet crank of the same stroke is much larger, at roughly 8 inches, weighing 350 lbs compared to 150 lbs in a forged crank. "The metal bar used to make a forged 4.000-inch SBC crank measures about 4.75-inches in diameter and the crank's total width ends up being 6.75 inches when the forging process is complete," Lieb says. The key difference between the two is how the ingots are shaped into cranks. However, while a forged crank is compressed during the forging process, the steel ingot used in a billet crank is already forged, albeit not quite as compressed as in a forged crank. Like a forging, a billet crank starts out as a large cylindrical ingot of steel. Think of billet cranks as an offshoot of forged cranks.
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