X65 pipeline steel for use in acid condition and its making process
A manufacturing method and technology for pipeline steel, which are applied in the direction of manufacturing converters, metal rolling, furnace types, etc., can solve the problems of unfavorable toughness and dynamic tear resistance of pipeline steel, coarse austenite grains, and increased energy consumption.
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[0071] See Table 3 for the examples, and Table 4 for specific process parameters. Table 5 shows the mechanical properties of the X65 anti-HIC pipeline steel coils of the embodiments of the present invention;
[0072] See Figure 1 for the process route: LD converter smelting→external refining (LF desulfurization, RH vacuum degassing, wire feeding Ca treatment)→continuous casting→slab reheating→controlled rolling→controlled cooling→coiling.
[0073] table 3
[0074] serial number
C
Si
mn
P
S
Cu
Ni
Nb
Ti
Mo
Ca
N
Ca / S
1
0.020
0.10
1.41
0.008
0.0010
0.22
0.13
0.057
0.005
0.15
0.0026
0.0025
2.6
2
0.039
0.20
1.49
0.004
0.0006
0.35
0.14
0.053
0.010
0.05
0.0015
...
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