X70 steel plate for low-cost pipe fittings and production method thereof
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A production method and low-cost technology, applied in the field of steel, can solve the problems of high cost, high production difficulty, and large amount of alloy added.
Inactive Publication Date: 2011-05-04
NANYANG HANYE SPECIAL STEEL CO LTD
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[0003] At present, the production of the known X70 steel plate is difficult, the production cycle is long, and it is difficult for enterprises with poor equipment level to produce low-cost and high-quality pipeline steel
As X70 steel for pipe fittings, the production is slightly lower because the requirements of the technical agreement are slightly lower than those of pipeline steel, but the domestic steel production of this type of steel plate requires a large amount of alloy addition and high cost
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Embodiment 1
[0031] Through molten iron pretreatment, converter smelting, LF refining, VD vacuum refining, continuous steel casting, heating, TMCP rolling, controlled cooling, and stacking and slow cooling processes, the finished Q550D (E) steel plate with the chemical composition described in Table 1 was obtained. The process parameters and mechanical properties are shown in Tables 4 and 5 below.
[0032] Table 1 Example 1 steel chemical composition
[0033]
Embodiment 2
[0035] Through molten iron pretreatment, converter smelting, LF refining, VD vacuum refining, continuous steel casting, heating, TMCP rolling, controlled cooling, and stacking and slow cooling processes, the finished Q550D (E) steel plate with the chemical composition described in Table 1 was obtained. The process parameters and mechanical properties are shown in Tables 4 and 5 below.
[0036] Chemical composition of table 2 embodiment 2 steel
[0037]
Embodiment 3
[0039] Through molten iron pretreatment, converter smelting, LF refining, VD vacuum refining, continuous steel casting, heating, TMCP rolling, controlled cooling, and stacking and slow cooling processes, the finished Q550D (E) steel plate with the chemical composition described in Table 1 was obtained. The process parameters and mechanical properties are shown in Tables 4 and 5 below.
[0040] The chemical composition of table 3 embodiment 3 steel
[0041]
[0042] The process route of the present invention: KR molten iron pretreatment→converter smelting→LF refining→VD vacuum smelting→continuous casting machine pouring→slab slow cooling→slab heating→slab dephosphorization→TMCP rolling→controlled cooling→steel plate straightening→stacking Pile slow cooling→surface inspection→finishing→flaw detection→performance inspection→qualified product storage.
[0043] 1.1 Steelmaking part
[0044] 1.1.1 Composition design
[0045] Since the steel plate requires high yield strength, ...
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Abstract
The invention discloses an X70 steel plate for low-cost pipe fittings and a production method thereof. The steel plate comprises the following chemical components in percentage by mass (unit, wt%): 0.04-0.08% of C, 0.20-0.40% of Si, 1.50-1.65% of Mn, less than or equal to 0.010% of P, less than or equal to 0.005% of S, less than or equal to 0.40% of micro-alloy elements (V, Nb, Ti, Mo and Ni), less than or equal to 0.050% of Als, and the balance of Fe and residual elements. The production method disclosed by the invention comprises the following steps: hot metal pretreatment, smelting with a converter, LF (ladle furnace) refining, VD (vacuum degassing) vacuum refining, continuous casting, heating, rolling, cooling control and slow cooling of stack. The steel purity is ensured with LF+VD process by reasonably adopting the chemical component deign of low carbon, low manganese and multiple composite micro-alloy elements, and the total level of various impurities is not over 3.0; the grain size of the steel can reach 11-12th level through the treatment of rolling control, cooling control and normalization; and the 16-25 mm X70 steel plate for the pipe fittings are successfully produced through the effective implementation of abovementioned measures.
Description
technical field [0001] The invention relates to steel products, in particular to a low-cost steel X70 steel plate for pipe fittings and a production method thereof. Background technique [0002] The amount of regional energy resources in my country does not match the level of regional development. In particular, there are significant differences in energy production and consumption between the eastern coastal regions and the central and western regions. The West-East Gas Pipeline Project started on July 4, 2002. build. It is expected that after two years, a long-distance and large-diameter natural gas pipeline will extend from Tarim, Xinjiang to Baihe Town, Shanghai, becoming an energy transmission artery across China. The main line of the "West-to-East Gas Pipeline" pipeline uses nearly 2.07 million tons of steel, with a total value of nearly 10 billion yuan. However, high-quality pipeline steel has always been a "bottleneck" in the development of my country's metallurgica...
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