Steel name: cutting steel grades: Y12 Executive Standard: GB / T 8731-1988 density: 7.85 cm / g, * 3 
 Feature 
 Y12 parathion low carbon free cutting steel, existing free cutting steel, phosphorus content in most steels. Commonly used in the manufacture of the less demanding on the mechanical properties of a variety of machines and instrumentation parts. 
 Purposes: 
 The Y12 fast cutting steel often instead of on the 15th of steel parts less demanding on the mechanical properties, such as bolt, nut, pin, shaft, fittings and spark plug coat. 
 Product mechanical properties 
 Tensile strength σb (Mpa): (hot) 390 - 540; (cold drawn) steel thickness or diameter of 8 to 20: 530 ~ 755;> 20 to 30: 510 ~ 735;> 30: 490 ~ 685 ≥ 7.0 Reduction of area ψ (%) (%) elongation δ5: (hot) ≥ 22; (cold): (hot) ≥ 36 Hardness: (hot) ≤ 170HB; (cold drawing) 152 217HB 
 Product delivery status 
 Delivery status: delivery, delivery status should be indicated in the contract to the hot-rolled or cold-drawn state. 
 Product chemical composition 
 Carbon C (%): 0.08 ~ 0.16 sulfur SI (%): 0.15 to 0.35 manganese MN (%): 0.70 ~ 1.00 sulfur S (%): 0.10 ~ 0.20 Phosphorus P (%): 0.08 ~ 0.15 Lead PB (%) : 0.15 to 0.35