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Question:

Why can steel HPB300, steel plate without Q300, steel structure manuscript review, but also continued the Q235, why not improve it?

Why can steel HPB300, steel plate without Q300, steel structure manuscript review, but also continued the Q235, why not improve it?

Answer:

HPB's full name is hot rolled round steel (HPB is Hot-rolled Plain Steel Bar) in English, commonly known as wire rod, diameter 6 - 12 rounds of the most common, including HPB235 and HPB300. You haven't met HPB400?. HRB400 and RRB400 are treated steel bars in order to have such high strength. But the general strength, ductility will be reduced, as the saying goes, "tossing" is not resistant to toss about.
Carbon steel according to the steel yield strength is divided into 5 grades: Q195, Q215, Q235, Q255 and Q275 of each grade because the quality is divided into A, B, C, D grade, with a maximum of four kinds, some only one; this is just plain carbon steel, the price is cheap, generally not heat treatment. Only quality carbon steel has the value of heat treatment.

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