For A514 grade E quenched and tempered steel buyers, the impact of the rise and fall of A514 grade E quenched and tempered steel prices is great. Because of the large amount of A514 grade E quenched and tempered steel purchases and the large amount of funds involved, many A514 grade E quenched and tempered steel purchasers will carefully consider the price issue, and some A514 grade E quenched and tempered steel purchasers who are far away will also consider the freight issue. When the price of A514 grade E quenched and tempered steel overall drops, a large number of A514 grade E quenched and tempered steel buyers will hoard in large quantities. When A514 grade E quenched and tempered steel prices rise, we should predict and stock up appropriately.
The quality grade of common carbon structural steel Q235 can be divided into A, B, C, D and E. Relatively, the quality of Q235A is poor and that of Q235E is the highest. Different grades of Q235 steel have different characteristics, which are mainly different from the impact temperature: Q235A does not require impact toughness test; grade Q235B is for room temperature (20℃); grade Q235C is for 0℃; grade Q235D is for - 20℃; grade Q235E is for - 40℃. The A514 grade E quenched and tempered steel, carbon structural steel Q235 has good combination of strength, plasticity and welding properties.
The characteristic of niobium in A514 grade E quenched and tempered steel etc. steel material is to increase the recrystallization temperature of austenite, so as to achieve the purpose of refining austenite grains. In general, the amount of niobium added in steel material is less than 0.05%, and the contribution of niobium above 0.05% to strengthening and toughening will no longer be obvious.
Quenching is a heat treatment process in which steel parts are heated to above the critical temperature, and after proper heat preservation, the parts are quickly cooled to room temperature in water or oil, so that martensite transformation occurs. The hardness of the quenched A514 grade E quenched and tempered steel increases sharply. Quenching is to prepare the organization for adjusting and improving the performance of A514 grade E quenched and tempered steel during tempering, while tempering determines the performance and life of the workpiece.
