345MPa-grade container steel plate with hydrogen induced cracking resistance and preparation method of 345MPa-grade container steel plate
A technology for anti-hydrogen-induced cracking and steel plates, which is applied in the field of container steel plates, can solve the problems of hydrogen-induced cracks easily occurring in container steel plates, achieve excellent hydrogen-induced cracking resistance, and eliminate banded structures
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[0046] In a second aspect, the present application provides a method for preparing the container steel plate described in the first aspect, such asfigure 1 As shown, the method includes the following steps:
[0047] S1. Obtain the slab;
[0048] S2. performing first heating, rough rolling, finish rolling and first cooling on the slab to obtain a cooled plate;
[0049] S3. performing normalizing heat treatment on the cooling plate to obtain a normalized steel plate;
[0050] S4. Performing second cooling on the normalized steel plate to obtain a container steel plate.
[0051] In the embodiment of the present application, normalizing is a heat treatment to improve the toughness of steel. After the steel member is heated to 30-50°C above the Ac3 temperature, it is kept for a period of time and then air-cooled. The main feature is that the cooling rate is faster than annealing and lower than quenching. During normalizing, the crystal grains of the steel can be refined in a sli...
Embodiment approach
[0057] As an optional implementation, the second cooling includes water cooling and air cooling;
[0058] In the water cooling, the normalized steel plate includes from the thickness direction: a first cooling layer, an intermediate cooling layer, and a second cooling layer, and the intermediate cooling layer is located between the first cooling layer and the second cooling layer between;
[0059] In the water cooling, the first cooling layer and the second cooling layer are water-cooled to 400°C-450°C at a rate of 80°C / s-90°C / s respectively; the intermediate cooling layer is cooled at a rate of 40°C / s- Water cooling at a speed of 50°C / s to 500°C~550°C;
[0060] The air cooling includes: cooling the water-cooled normalized steel plate to room temperature by air cooling.
[0061] In the embodiment of the present application, the normalizing heat treatment and the second cooling can more accurately control the structure type, proportion and microhardness along the thickness di...
Embodiment 1～ Embodiment 5
[0063] Embodiment 1~Example 5 and comparative example
[0064] In Example 1 to Example 5 and Comparative Example, the slab with the chemical composition in Table 1 (the rest is Fe and unavoidable impurities) is heated to 1100-1200, and then through rough rolling, finish rolling and water cooling to obtain ferrite Steel plate with body + pearlite structure.
[0065] The process parameter control of heating, rough rolling, finish rolling, normalizing and cooling in the production process is shown in Table 2 and Table 3.
[0066] The steel plate was sampled and tested for mechanical properties. The test results are shown in Table 4.
[0067] The steel plate was sampled and tested for its resistance to hydrogen-induced cracking. The test results are shown in Table 5.
[0068] Table 1 The chemical components of the container steel plates of Examples 1-5 and Comparative Examples.
[0069]
[0070] Table 2 Preparation process of container steel plates of Examples 1-5 and Compar...
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Abstract
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