中文版(1) steel products' chemical composition affects one of hardened most important factors. Everything causes “c” in the steel the curve right lateral or the left shift alloying element, to quenches suitable to have the enormous influence. Will make “c” the curve right lateral element to enhance the steel the hardenability; Will cause “c” the curve left shift element to reduce the steel the hardenability. If 45 steel and the 40Cr steel, its carbon amount is similar, but, because the former not chromic element, the latter chromic element approximately 1%, under same level heat treatment condition, their hardenability obviously different, 45 steel can only quench the far 3.5-9.5 millimeters, but the 40Cr steel may the through harden 25-32 millimeters.
(2) heat treatment cooling medium's cooling characteristic and the cooling rate, also have the very tremendous influence to the steel hardenability. The cooling rate is quick, the hardenability enhances, the cooling rate but, the hardenability reduces. For example 45 steel cooling and cool in the water in the oil, its hardenability is different, cools when the water, but the through harden 11,120 millimeters, cool in the oil time, but through harden 3.5-9.5 millimeters.
(3) components' shape size, the heating temperature, the coolant conditions and so on, are affecting the steel hardenability in varying degrees. The shape size is small, the heating temperature is high, cools and so on to be able continuously to enhance the hardenability to a certain extent; But the shape size is big, the heating temperature is low, the isothermal cooling and so on can actually cause the hardenability to drop.
(4) heating's way will also affect the hardenability, in the actual operation this will be very important, we easily will often neglect this point. Because the heating way is different, produces the heating effect is also different. For example with the box-type electric stove the oxidation which, the decarbonization phenomenon produces the salt bath is more serious than, will reduce the hardenability.
