Cold drawn 1215 steel bar is resulfurized and rephosphorized carbon steel.

Carbon steels are steels comprising only carbon as the specific alloying element.

1211 is the designation in both the SAE and AISI systems for this material. G12110 is the UNS number.

A typical steel bar that is usually formed from carbon steel.

Y15Pb lead-containing easy-to-cut steel, good machinability

Alloy steel Y15 is use for civil and industrial construction, means of transport, electionics and medical use

Y12Pb belongs to free-cutting structural steel, and the implementation standard is GB/T 8731-1988.

Y12 is the code name of a steel. Y12 is divided into two types, sulfur-phosphorus composite low-carbon free-cutting steel and free-cutting steel.