Obtaining method of large deformation pipe line steel double phase structure
A dual-phase microstructure and acquisition method technology, applied in heat treatment equipment, heat treatment process control, manufacturing tools, etc., can solve the problem of duplex microstructure photos and stress-strain curves without providing manufacturing process plans, large-deformation duplex microstructure, production methods and The process has not been publicly reported and other issues
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Embodiment 1
[0027] A method for obtaining a dual-phase structure of X70 steel grade large deformation pipeline steel, comprising the following steps:
[0028] Step 1: Determine the chemical composition of the steel (as shown in the table below): the units of the following parameters are mass percentages
[0029]
[0030] Step 2: The continuous cooling transformation curve of steel, such as figure 1 The CCT curve shown;
[0031] Step 3: According to the continuous cooling transformation curve, the cooling rate of the moderately accelerated cooling for obtaining the dual-phase structure of the steel is determined to be in the range of 37-46°C / s;
[0032] Step 4, determining that the range of the phase transition point corresponding to the cooling rate range is 663-660°C;
[0033] Step 5. Determine the starting cooling temperature of the steel as 680° C. and the cooling rate as 40° C. / s according to the determined phase transition point and cooling rate range;
[0034] Step six, adopti...
Embodiment 2
[0046] A method for obtaining a dual-phase structure of X80 steel grade large deformation pipeline steel, comprising the following steps:
[0047] Step 1: Determine the chemical composition of the steel (as shown in the table below): the units of the following parameters are mass percentages
[0048]
[0049] Step 2: The continuous cooling transformation curve of steel, such as Figure 4 shown;
[0050] Step 3: According to the continuous cooling transformation curve, the cooling rate of the moderately accelerated cooling for obtaining the dual-phase structure of the steel is determined to be in the range of 45-55°C / s;
[0051] Step 4, determine the range of the phase transition point corresponding to the cooling rate range (700-708°C);
[0052] Step 5. Determine the starting cooling temperature of the steel as 720° C. and the cooling rate as 50° C. / s according to the determined phase transition point and cooling rate range;
[0053] Step six, adopting the moderately acc...
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