CCS D40 Steel Plate

 

 

 

 

 

Effect on Critical Temperature

 

Silicon element will increase the critical temperature (Ac1 and Ac3) of steel. This means that a higher heating temperature is required to austenitize the steel during the quenching process. For example, in some spring steels with a relatively high silicon content, their Ac1 and Ac3 temperatures are higher than those of ordinary carbon steels. This is because after silicon atoms dissolve into ferrite, they will change the interaction between iron atoms and carbon atoms, so that the transformation from ferrite to austenite requires more energy, thus increasing the critical temperature. Generally speaking, for every 1% increase in silicon content, the Ac1 temperature may increase by about 8 - 12 °C.

 

Effect on Austenite Grain Growth

 

Silicon can inhibit austenite grain growth to a certain extent. During the quenching heating process, the austenite grains of steel tend to grow, and the presence of silicon atoms can impede the migration of grain boundaries. This is because silicon atoms segregate at the grain boundaries, reducing the energy of the grain boundaries and decreasing the driving force for grain boundary migration. In this way, during quenching heating, the steel can maintain relatively fine austenite grains. The fine austenite grains will transform into fine martensite structures after quenching cooling, so that the steel has better comprehensive mechanical properties, such as higher strength and toughness.

 

 

 

CCS/DH40 high strength property in tempering and quenching

Grade	Thickness	Yield Strength	Tensile Strength	Elongation	Impact Energy
	(mm)	MPa (min)	MPa	% (min)	(KV J) (min)
					-20 degree
CCSDH40	8-240	390	510-650	20	41J

 

 

 

 

 

 

Effect on Hardenability

 

Silicon can improve the hardenability of steel. Hardenability refers to the ability of steel to obtain a martensite structure during quenching. The addition of silicon changes the critical cooling rate of steel. It reduces the critical cooling rate of steel, which means that the steel can also form a martensite structure at a slower cooling rate. This is because silicon increases the stability of austenite and prolongs the incubation period of austenite transformation to other structures, so that there is more time to form martensite during the cooling process. For example, when manufacturing large - sized parts, due to the relatively large size of the parts, the cooling rate is relatively slow. This characteristic of silicon element helps to ensure that sufficient martensite structure can be obtained from the surface to the core of the part, thus improving the overall performance of the part.

 

 

 

 

 

 

 

 

 

 

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