Steel plate for 500MPa-level pressure container for resisting sulfide stress corrosion cracking and production method thereof
A technology for stress corrosion cracking and sulfide resistance, which is applied in the field of steel plate manufacturing for pressure vessels to achieve the effects of favorable construction and manufacturing, stable performance and good anti-lamellar tearing performance
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Embodiment 1
[0032] The 500MPa steel plate for pressure vessels resistant to sulfide stress corrosion cracking in this example is prepared from the following components by mass percentage: C: 0.17%, Si: 0.37%, Mn: 1.29%, P: 0.010%, S : 0.001%, Nb+V+Ti: ≤0.060%, Alt: 0.035%, the rest is Fe and unavoidable impurities, of which O, N, and H contents are 0.0018%, 0.0035% and 0.00015%, respectively.
[0033] The thickness of the finished steel plate is 16mm.
[0034] The preparation method of described steel plate, comprises the following steps:
[0035] (1) Hot metal pretreatment: raw material hot metal P=0.080%, S=0.024%, As=0.0020%. After KR hot metal pretreatment and deep desulfurization treatment, the S content of hot metal is 0.0006%.
[0036](2) Converter smelting: In the final composition: C=0.09%, P=0.0080%, S=0.0078%, when tapping the steel, use the slag blocking rod and the slag blocking plug to tap the steel, the tapping time is 5 minutes, and the tapping time is 5 minutes. The pro...
Embodiment 2
[0045] The 500MPa steel plate for pressure vessels resistant to sulfide stress corrosion cracking in this example is prepared from the following components by mass percentage: C: 0.18%, Si: 0.36%, Mn: 1.33%, P: 0.009%, S : 0.001%, Nb+V+Ti: ≤0.090%, Alt: 0.032%, the rest is Fe and unavoidable impurities, of which O, N, and H contents are 0.0023%, 0.0020% and 0.00013%, respectively.
[0046] The thickness of the finished steel plate is 42mm.
[0047] The production and preparation method of the 500MPa grade steel plate for pressure vessels resistant to sulfide stress corrosion cracking in this example is the same as in Example 1, the difference is that the S content after the molten iron pretreatment is 0.0010%, and the P and S contents in the converter end point components are respectively 0.0078% and 0.0075%, the RH furnace vacuum time is 15 minutes, the soft argon blowing and weak stirring time after the RH station feeds the line is 16 minutes, the continuous casting slab exi...
Embodiment 3
[0049] The mass percent and components of the 500 MPa grade sulfide stress corrosion cracking-resistant steel plate for pressure vessels in this embodiment are the same as those in Embodiment 2.
[0050] The thickness of the finished steel plate is 70mm.
[0051] The production and preparation method of the 500MPa grade steel plate for pressure vessels resistant to sulfide stress corrosion cracking in this example is the same as in Example 1, the difference is that the S content after the molten iron pretreatment is 0.0010%, and the P and S contents in the converter end point components are respectively 0.0078% and 0.0075%, the RH furnace vacuum time is 15 minutes, the soft argon blowing and weak stirring time after the RH station feeds the line is 16 minutes, the continuous casting slab exits the heating furnace temperature 1160°C, the rough rolling start rolling temperature is 1145°C, and the thickness of the intermediate billet is 140mm , the finishing rolling temperature i...
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