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Steel 440B
As for 440B steel, it is practically identical to type 440A in all respects, except for one crucial detail – the ratio of chromium to carbon in austenite here is 14.5 to 0.52 percent (measured at a temperature of 1100°C). If we were to discuss maximum hardness, it can reach the (psychologically attractive) limit of 60 HRC.
Corrosion resistance is practically the same for 440B as for steel 12C27M, but it offers a lower level of toughness, greater wear resistance, and lower edge stability. Stainless steel 440B is interesting from an engineering and chemical perspective, but the reality today is that its siblings, steels 440C and 440A, perform better on the market, and if you find any products in this range, they will have the “440C/440A” mark on the blade. One of the few representatives of the "440B" clan is, for example, the "Randall #5" product.
In connection with 440B steel, we must undoubtedly also mention Böhler N685E steel, which is quite similar to 440B, just with a slightly larger volume of carbon and alloying elements. However, since it achieves maximum hardness of 56 HRC to 57 HRC, it is considered inferior compared to, for example, S30V steel.
In summary, 440B steel has a greater carbide content in its structure. Therefore, it also has slightly higher hardness compared to 440A, edge stability, and higher wear resistance. However, it is more brittle and its corrosion resistance is not top-notch. It can definitely be described as a slightly better version of 12C27M steel with lower resistance and edge durability.
