USE AND CLASSIFICATION OF FREE CUTTING STEEL STRUCTURES

Easy cutting steel structure is the role of some elements in steel to improve the machinability of steels, suitable for high speed cutting of steel in the automatic machine. Elements commonly used to improve machinability of S, Pb, CA, etc., which in s most commonly, s in steel formation of MNS inclusions MNS is crisp and certain lubrication and chip is easy to break, high surface roughness of workpiece, reduce tool wear, improve the cutting speed. Easy cutting structural steel although the steel containing P, S more, single in this kind of steel is as a beneficial element to join or save down, therefore, belong to high quality steel. Easy cutting structural steel is used as the production standard parts such as small screws, nuts, oil pumps, watches, computers, typewriter parts, machine tools, light bars, screws, etc.. Free cutting steel plate with a “Y” with steel, low alloy steel in Y40Mn are good, the rest are carbon steel.

purpose

Free cutting steel structure is referred to as easy cutting steel, containing a small amount of cutting elements, good machinability of steel is. 1.Y12 parathion compound low carbon free cutting steel, free cutting steel is the existing phosphorus content in a steel most. Commonly used in the manufacture of mechanical performance requirements is not high of all kinds of machines and instruments instrument parts, such as a bolt, a nut, a pin, a shaft, a pipe connected to the first. 2.Y12Pb containing free cutting steel, cutting processing is good, there is no performance on the direction, and has a higher mechanical properties, commonly used in the manufacture of more important mechanical parts, precision instruments, such as parts. 3.Y15 composite of high sulfur and low silicon easy cutting steel is developed in our country and the success of steel, cutting than Y12 steel is the, commonly used for made important standards, such as bolts, nuts, pipe joint, a spring seat. 4.Y15Pb with Y12Pb, the machinability is better. 5.Y20 low sulfur compound free cutting steel, machinability is better than 20 steel and lower than 12 steel, can be carburizing treatment, commonly used in the manufacture of surface hardness, high toughness of the heart of the instrument, meter, shaft type wear-resistant parts. 6.Y30 low sulfur compound free cutting steel, high mechanical properties, machinability is also appropriate to improve the standard parts can be manufactured with high strength requirements. 7.Y35 with Y30 steel, can be quenched and tempered. 8.Y40Mn high sulfur carbon free cutting steel, high strength, hardness and good machinability, suitable for processing high rigidity of the machine parts, such as machine screws, light bars, spline shaft, rack, etc.. 9.Y45Ca Ca-S free cutting steel, not only by cutting, and the heat treatment has good mechanical properties, suitable for manufacturing is an important structure of the machine parts, such as machine tool gear shaft, spline shaft, tractor transmission shaft.

classification

Specific grades are: Y12, Y12Pb, Y15, Y15Pb, Y20, Y30, Y35, Y40Mn, Y45Ca a total of nine grades. Easy cutting structural steel points plus sulfur free cutting steel, plus sulfur free cutting steel, plus lead free cutting steel, plus calcium free cutting steel, plus sulfur carbon manganese free cutting steel and so on. Symbol and Arabia digital representation. The “pinyin” the first letter “Y” to Arabia, followed by two numbers that the carbon content of the 10000 fraction.