On many occasions people more choice of steel instead of carbon steel mainly has the following the aspects.
(1) Poor hardenability
Carbon steel use water quenching, its critical quenching diameter into 15 ~ 20mm, 20mm diameter greater than for parts, even if the water can not quench hardenability, can not ensure that the entire section to get the same mechanical properties. So, for demanding large parts, carbon steel is certainly not applicable. The steel has high hardenability, can be used in the manufacture of large cross-sectional shape of complex parts.
(2) High-temperature strength, low carbon steel, red hardness difference
When the carbon-carbon steels at temperatures above 200 ℃, its strength and hardness will soon be reduced. The good stability after tempering steel. Red hardness, and can operate at higher temperatures.
(3) Without good overall performance
For example, when using quenching to try to get a good overall performance, to ensure high strength, toughness is low, to ensure good toughness, the intensity of the low side. This is due to the poor stability of carbon steel tempered reason. Therefore, the resulting carbon steel alloy poor overall performance much higher than that of the alloy steel has good toughness.
(4) Without special properties
For example, requiring high temperature hardness or tonicity, anti-oxidation, corrosion resistance, special electrical, magnetic, etc., can not be obtained with carbon steel, alloy steel can choose to meet the above requirements.
Carbon steel also has some advantages, such as by changing its carbon content and adequate heat treatment, can be obtained in many industrial production performance required. Because of the low carbon steel production, price, easy, good processing performance, the industry is still the most widely used steel materials, accounting for over 80% of the total amount of steel.
To compensate for the disadvantages of carbon steel, carbon steel cable on the basis of the consciously adding some alloying elements, required to obtain a variety of alloy properties. While steel has excellent or special nature, it is very important steel, can be adapted to the needs of the area, but there are many disadvantages of steel, mainly that the alloying elements, the steel smelting and processing poor performance than carbon steel, the price is more expensive. According to the principle of reasonable selection, when the carbon steel meet the requirements, you should try to use carbon steel.
Post time: Sep-26-2019