Medium carbon high manganese steel (carbon content 0.30% to 0.35%) is generally used for bar processing parts. Whether heat treatment is required depends on the application and the required strength.
High carbon high manganese steel (AISI 1547 ~ 1566) has higher strength and wear resistance than ordinary carbon steel grades.
Boron-containing high manganese steels (such as AISI 15B48H) are commonly used in shaft products. This kind of steel can replace alloy steel and high carbon steel to manufacture screws that require heat treatment. The cutting parameters are shown in Table 6. (slightly)
Turning high manganese steel is similar to turning carbon steel in the 10XX series.
Tool material grade description
The technical specifications for tool materials are derived from ANSI (American National Standards Institute) and ISO (International Organization for Standardization). ANSI uses an industry code that identifies uncoated carbide grades (C-1, C-2, etc.) and coated carbide grades (CC-5, CC-6, etc.). The digital part of the code only gives the basic properties of the cemented carbide, such as toughness and hardness. C-1 ~ C-4 grades are pure tungsten carbide with cobalt binder, but the cobalt content and tungsten carbide particle size are different.
The CC-5 to CC-8 grades include composite tungsten carbide, tantalum carbide, titanium carbide, and tantalum carbide using a cobalt binder. These grades have better resistance to crater wear than C-1 to C-4 and are therefore recommended for machining steel. From CC-5 to CC-8 grades, the hardness of the material increases in turn, and the toughness decreases in turn.
The CC-6 grade is a universal carbide material with medium to high levels of impact resistance and moderate levels of wear resistance and is recommended for roughing and semi-finishing. The CC-7 grade has a medium level of impact and abrasion resistance and is suitable for finishing. Cemented carbides with larger grades have better wear resistance and higher cutting speeds. Hard alloys with smaller grades have better toughness and can use larger feeds.
The ISO standard code consists of letters and two digits. The letter C indicates a coated cemented carbide, and the letter P at the back indicates that the grade is suitable for processing carbon steel. CP-10 grades are suitable for high-speed cutting, chip cross-section is small ~ medium; CP-20 means suitable for medium-speed cutting, medium cross-section of the chip; CP-30 means suitable for medium to low speed cutting, large to large cross section of the chip. The larger the number of grades, the greater the toughness of the cemented carbide and the lower the hardness. Carbide with a smaller number of grades has better wear resistance and can improve the cutting speed; the hard alloy with a larger number of grades has better toughness and can increase the feed rate.
It should be noted that the carbide grades specially named by different manufacturers are not necessarily the same as the ANSI and ISO codes.
The cutting speeds given in the previous table are only the initial recommended values, as the cutting speed can be increased by 15% to 30% with the use of new machine tools and coated carbide tools, but machine power must be considered.
Coated carbide tools not only have a long service life, but also high-speed cutting to improve processing efficiency. Cutting speed is increased by 30% and processing costs can be reduced by 15%.
Of the various coating materials, TiAlN coatings using PVD are most commonly used, and are generally used in dry high speed finishing and general processing. A 3-layer coating using a CVD process (TiN for the outer layer, Al2O3 for the middle layer, and TiCN for the inner layer) is generally used for roughing and semi-finishing.
Although the turning of carbon steel is not complicated, part manufacturers need to understand the grades and material properties of carbon steel. By selecting the tool, lathe (or turning center) and workpiece clamping device, the machining efficiency can be greatly improved.
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