a, 08Ni3DR steel plate delivery status: steel plate quenched + tempered state delivery, can also be specified according to technical requirements of the delivery state. In order to improve the toughness of steel, can also be intermediate heat treatment (secondary quenching), the thickness of not more than 12mm steel plate can also be two normalised and tempered state delivery, the tempering temperature of the steel plate is not less than 540 degree ;
b, tempering: steel factory by high-temperature tempering heat treatment, this delivery state is called high-temperature tempering state. High-temperature tempering of the tempering temperature is high, is conducive to the complete elimination of internal stresses, progress in plasticity and toughness, carbon structural, alloy steel, to ensure that the hardened structural steel steel can be used for high-temperature tempering state delivery. Certain martensitic high-strength stainless steel, high-speed tool steel and high-strength alloy steel, due to high hardenability and the strengthening effect of alloying elements, often in the quenching (or tempering) after a high-temperature tempering, so that the steel carbide proper aggregation, to get the carbide particles coarser tempered Soxhlet organisation (similar to the spheroidal annealing organisation), and therefore, this state of delivery of the steel has a very good cutting and machining performance;
