JIS G3101 SS400 steel plates are well known mild steel plates. Sometimes clients would ask to add Boron into SS400 steel plates, so as to improve the hardenability of SS400 steel. However, when Boron is added, the SS400 steel plates become alloy steel and not mild steel anymore. And strictly, the grade should be written as SS400B.
The difference between SS400B steel plate and SS400 steel plate is that SS400B is the combination of SS400 and Boron, and they have different mechanical properties.
The added Boron has strong ability to improve the hardenability of JIS G3101 SS400 steel plates. The effect of 0.0010% ~ 0.0030% boron can be equivalent to 0.6% manganese, 0.7% chromium, 0.5% molybdenum and 1.5% nickel. Therefore, its ability to improve hardenability is hundreds of times as many times as the alloy elements above, so only a small amount of boron can be used to save a large number of precious alloy elements.
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