Production method of pipeline steel plate with excellent impact toughness

A production method and impact toughness technology are applied in the production field of pipeline steel plates with excellent impact toughness, which can solve the problems of increased time, disadvantageous mass production, increased process cost and time, etc., and achieve the performance of tensile strength and yield strength. , The production process is simple, the effect of improving the internal quality

Active Publication Date: 2013-04-03
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, in US Patent US2008-0283161, it is proposed to obtain good hydrogen-induced cracking resistance steel and strength value through online quenching and tempering treatment of hot-rolled sheets, but after quenching and tempering, bainite/martensite/reticular ferrite structure is obtained, This kind of structure is not the most good structure form for hydrogen-induced cracking, and only the tensile and yield strength values ​​are given in the patent, and the elongation and impact toughness values ​​are not given, indicating that the method involved in this invention obtains The impact toughness of the steel plate is unstable, which is not conducive to mass production
[0004]

Method used

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  • Production method of pipeline steel plate with excellent impact toughness
  • Production method of pipeline steel plate with excellent impact toughness
  • Production method of pipeline steel plate with excellent impact toughness

Examples

Experimental program
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Example Embodiment

[0023] Example 1-3

[0024] The example is a method for producing a pipeline steel plate with excellent impact toughness. The components of each example are shown in Table 1 by weight percentage:

[0025] Table 1 Chemical composition (wt%) of each embodiment of the present invention

[0026] ExampleC Si MnPS Alt Nb Ti Ni Example 10.050.251.550.0120.00300.0260.0540.0090.16 Example 20.050.241.530.0120.00250.0300.0580.0110.16 Example 3 0.050.251.520.0120.00280.0280.0530.0090.15

[0027] The production methods of each embodiment are as follows:

Example Embodiment

[0028] Example 1

[0029] The production method includes the following steps:

[0030] (1) Smelting: The process flow of molten iron pretreatment- converter smelting-LF refining-RH furnace vacuum treatment is adopted. After Mg desulfurization treatment, molten iron [S]≤0.005% is required; the final composition of the converter is controlled according to the composition of the above-mentioned pipeline steel plate; LF furnace Purity control target of molten steel in refining: [O]≤15ppm, [N]≤50ppm and [H]≤2ppm; RH vacuum treatment vacuum holding time 20min;

[0031] (2) Continuous casting: adopting dynamic soft reduction technology to produce cast slabs, the degree of central segregation is greatly reduced, reduction amount = 3.5mm, solid phase ratio fs = 0.75;

[0032] (3) Heating: the billet enters the heating furnace, the heating temperature of the billet is 1150℃, the furnace time is 200min, and the discharge temperature is 1180℃;

[0033] (Iv) Rolling: Two-stage rolling is adopted, t...

Example Embodiment

[0034] Example 2

[0035] The production method includes the following steps:

[0036] (1) Smelting: The process flow of molten iron pretreatment- converter smelting-LF refining-RH furnace vacuum treatment is adopted. After Mg desulfurization treatment, molten iron [S]≤0.005% is required; the final composition of the converter is controlled according to the composition of the above-mentioned pipeline steel plate; LF furnace Purity control target of molten steel in refining: [O]≤15ppm, [N]≤50ppm and [H]≤2ppm; RH vacuum treatment vacuum holding time 25min;

[0037] (2) Continuous casting: adopting dynamic soft reduction technology to produce cast slab, the degree of central segregation is greatly reduced, reduction = 3.5mm, solid phase ratio fs = 0.95;

[0038] (3) Heating: the slab enters the heating furnace, the heating temperature of the slab is 1200℃, the furnace time is 220min, and the discharge temperature is 1220℃;

[0039] (Iv) Rolling: Two-stage rolling, rough rolling temperatur...

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Abstract

The invention discloses a production method of a pipeline steel plate with excellent impact toughness. The pipeline steel plate comprises the following components in percentage by weight: 0.02-0.07% of C, 0.10-0.40% of Si 1.00-1.80% of Mn, not more than 0.015% of P, not more than 0.0050% of S, 0.030-0.060% of Nb, 0.006-0.020% of Ti, not more than 0.30% of Ni, 0.012-0.050% of Al, and the balance of Fe and impurities. According to the invention, by means of composition control of extremely low content of S and low contents of P, O, N and H, the smelting process of calcium treatment and combination with a pouring process under dynamic soft reduction, processes of precise rolling and precise cooling control are adopted to improve the toughness of the steel plate, so that the center macroscopic and microscopic segregation grades of a cast blank are reduced effectively, ferrites with more tough tissues are obtained, the impact toughness performance of the steel plate is improved, and in addition, the production method is simple in production process and lower in cost.

Description

technical field [0001] The invention relates to a production method of a steel plate, in particular to a production method of a pipeline steel plate with excellent impact toughness. Background technique [0002] With the adjustment of my country's energy structure and the demand for environmental protection, the demand for energy such as natural gas and oil continues to increase. The key to the application of pipeline steel in the future is to serve in high-pressure, deep-sea, and acidic environments. The harsh service environment will also have higher and higher requirements on the performance of steel materials, such as hydrogen-induced crack resistance, stress corrosion cracking resistance, and extremely low temperature toughness. This also affects the uniformity of structure and composition of pipeline steel plates. Make higher demands. [0003] High-performance pipeline steel plate requires high cleanliness, high slab composition uniformity and structure uniformity. ...

Claims

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Application Information

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IPC IPC(8): C22C38/14B22D11/16B21B37/74
Inventor 尹雨群唐春霞李强赵晋斌苑阳阳
Owner NANJING IRON & STEEL CO LTD
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