Delivery status of boiler plate SA516 Gr70

The common delivery status of boiler plate SA516 Gr70 has the following points:
SA516 Gr70 plate quenching: A process of rapid quenching after heating to above the phase transition point temperature. Increase the hardness of the material, but reduce the toughness.

SA516 Gr70 normalizing: After heating to above the phase transition temperature, normal cooling (in air).
Annealing of SA516 Gr70: After heating to a temperature above the phase transition point, cool slowly. Eliminate the effect of quenching, eliminate stress, and uniform composition.

SA516 Gr70 Tempering: After quenching, it is heated to a certain temperature (below the quenching temperature, heat preservation, and then cooling. The composition is uniform, the hardness is slightly reduced, and the toughness is greatly improved.
Generally speaking, annealing and normalizing are required first: eliminate the influence of the original heat treatment. Then quenched and then tempered.

 

SA516 Gr70 steel plate delivery specifically introduction:
Controlled rolling of SA516 Gr70 steel is also controlled rolling.
That is, on the basis of adjusting the chemical composition of the steel, by controlling the heating temperature, rolling temperature and other process parameters to control the change law of the austenite structure and the structure of the phase transformation product, to achieve the purpose of refining the structure and improving the strength and toughness.

 

Controlled rolling normalizing is to control the rolling, control the ritual temperature, reduction, cooling rate, and final rolling temperature and other measures, so that the performance of the steel plate can achieve a good strength and toughness ratio.

Normalizing, also known as normalization. It is a metal block treatment process that heats the workpiece to 30~50C above A3 or Accm, and after holding it for a period of time, removes it from the furnace in the air or does not drink the air to cool it. The difference between normalizing and annealing is that the cooling rate of normalizing is faster than that of annealing.