Improvement of forgings steel quality

Many improvements in the quality of forgings are explained in the following 2 aspects.

1. The reduction of cell deflection is just as described in chapter IY 1 (f). With the improvement of the t strike method and the steel key dMl selection method, the segregation of steel color is less. The results of the total "MF" comparison of the 180 ton steel blooms and multiple flex sides were obvious, and the segregation of the steel bond bottom in the negative segregation area of the steel bond IE was significantly reduced by 10. An example of the longitudinal section of a 570 ton steel indicates that the distribution of carbon is said to say that except for the part of the stomach, there is no practical segregation of e with such steel {MFMPMt > low alloy steel forged by the nuclear reactor pressure vessel tS blue through the cupboard, and found that its carbon segregation is limited to omega.21. Within the range of -021%.

2. The improvement of toughness design of steel involves many factors. As an index to evaluate the reliability of machinery and equipment, toughness is of primary importance.