ASTM AISI 1212 1215 1140 1144 Free Cutting Steel bar is high sulfur medium-low carbon free-cutting steel, which has better cutting performance បើធៀបនឹងដែកថែប 10# 25# 35# 45#, ASTM 1212 1215 1140 1144 អាចបង្កើនអាយុឧបករណ៍ដោយបួន ដងបង្កើនផលិតភាព 30% និងមានកម្លាំងនិងភាពរឹងខ្ពស់ជាង។