F8P4 flux is a sintered flux type in the United States, "F" means flux, the number after "F" indicates the tensile strength level; "P" indicates the mechanical properties after heat treatment; the number after "P" indicates the impact of deposited metal The test temperature is required when the absorbed work is not less than 54J. F8P4 sintered flux is a special flux for low-alloy Cr-Mo heat-resistant steel welding jointly developed by our company and Sinopec Group Nanjing Chemical Industry Co., Ltd. According to the requirements, a special production process was adopted, and the F8P4 flux developed has the advantages of low moisture absorption, low diffusion hydrogen content of the deposited metal, low content of S and P, and low manganese burning loss, and has replaced imported products.
1 flux development
1.1 Technical indicators
After the flux is matched with the H08CrMoA welding wire, the weld should meet the following technical specifications:
Table 1% of deposited metal chemical composition (TABLE 1:CHECOMICAL COMPOSITION OF DEPOSIT METAL
Note: X (brittle factor) should be calculated as follows:
X=(10P+5Sb+4Sn+AS)/100
Table 2: Mechanical properties of deposited metal (TABLE 2: MECHANICAL PROPERTIES OF DEPOSIT METAL)
1.2. The choice of slag system
F8P4 flux is a special flux for low-alloy heat-resistant steel. During the welding process, it is required to minimize the oxidation loss of alloying elements. The flux should have a high transition coefficient of alloying elements. The fluorine-based slag system is selected as shown in Table 3.
Table 3: Fluorine-based slag system selection (TABLE 3: CHOICE OF THE SLAG SYSTEM)
In order to meet the requirements for the use of welded Cr-Mo steel, a large number of tests have been carried out to determine the F8P4 flux composition as shown in Table 4.
Table 4: % of the main components of F8P4 flux
(table 4: main composition of flux):
Calculate the formula according to the alkalinity:
F8P4 flux alkalinity is Bi=2.7
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