Mechanical Properties
Tensile strength σb (MPa) :( hot) 390 to 540;
(Cold drawn) steel thickness or diameter of 8 to 20 o'clock: 530 to 755;> 20 to 30: 510 ~ 735;> 30: 490 ~ 685,
Elongation δ5 (%) :( hot rolled) ≥22; (rolled) ≥7.0
Reduction of area ψ (%) :( hot rolled) ≥36
Characteristics and uses cutting structural steel, good accuracy, easy cutting, greatly improve tool life and reduce processing time. Is S-P composite sulfur, low silicon cutting steel. Significantly higher than the low-carbon steel cutting, productivity increased by 30 to 50 percent lower than carbon steel, especially when tapping, tap life more than double than the low-carbon steel, manufacturing unimportant standard parts, such as bolts, nuts , fittings, spring seat and so on.
Ingredients:
C: 0.10-0.18
P: 0.05-0.10
S: 0.23-0.33
Mn: 0.80-1.20
Si: ≤0.15
Cutting structural steel, by increasing the content of sulfur and manganese in steel, forming large amounts of manganese sulfide inclusions easily disconnected when cutting iron, can improve the surface quality of parts, and are able to faster speeds and deeper the amount of feed processing, thereby improving productivity and reduce production costs. Low-carbon steel is mainly used to manufacture cutting strength less demanding, but require a higher roughness of the parts, such as screws, screws, nuts, pipe fitting, connector bolts. Parts of carbon can be used for cutting steel Y35 higher strength requirements, and difficult to process, such as textile machines, parts on your computer. Low-carbon steel is generally cutting hot-rolled or cold-drawn at the state, can also be surface carburizing; carbon free cutting steel after heat treatment in general use.
