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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

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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] Chinese patent 201110150172.3 (CN 102230065 A) "A Heat Treatment Process for Improving Low-Temperature Impact Toughness of Pipeline Steel" publicly proposes to obtain good toughness by hot rolling and heat treatment Low temperature impact toughness, but this heat treatment method increases the production cost and time, and the improvement of impact toughness is not particularly obvious
Chinese patent 201110358173.7 (CN 102382961 A) "A production method of extra-thick steel plate to ensure transverse impact toughness" discloses a method of extra-thick plate to ensure transverse impact toughness, but this method also increases the process cost due to the use of heat treatment and time

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

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Embodiment 1-3

[0024] Embodiment is a kind of production method of pipeline steel plate with excellent impact toughness, and each embodiment composition is as shown in Table 1 by weight percentage:

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

[0026] Example C Si mn P S Alt Nb Ti Ni Example 1 0.05 0.25 1.55 0.012 0.0030 0.026 0.054 0.009 0.16 Example 2 0.05 0.24 1.53 0.012 0.0025 0.030 0.058 0.011 0.16 Example 3 0.05 0.25 1.52 0.012 0.0028 0.028 0.053 0.009 0.15

[0027] The production method of each embodiment is respectively:

Embodiment 1

[0029] The production method comprises the following steps:

[0030] (1) Smelting: adopt the technological process of molten iron pretreatment-converter smelting-LF refining-RH furnace vacuum treatment, and require molten iron [S]≤0.005% after spraying Mg desulfurization treatment; the composition of the end point 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; vacuum holding time of RH vacuum treatment is 20min;

[0031] (2) Continuous casting: adopt dynamic light reduction technology to produce billet, the degree of center segregation is greatly reduced, reduction=3.5mm, solid fraction fs=0.75;

[0032] (3) Heating: the slab enters the heating furnace, the heating temperature of the slab is up to 1150°C, the time in the furnace is 200min, and the temperature out of the furnace is 1180°C;

[0033] (iv) Rolling: Two-stage ro...

Embodiment 2

[0035] The production method comprises the following steps:

[0036] (1) Smelting: adopt the technological process of molten iron pretreatment-converter smelting-LF refining-RH furnace vacuum treatment, and require molten iron [S]≤0.005% after spraying Mg desulfurization treatment; the composition of the end point 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: adopt dynamic light reduction technology to produce billets, the degree of center segregation is greatly reduced, reduction = 3.5mm, solid fraction fs = 0.95;

[0038] (3) Heating: the slab enters the heating furnace, the heating temperature of the slab is up to 1200°C, the time in the furnace is 220min, and the furnace temperature is 1220°C;

[0039] (iv) Rolling: two-stage rolling is ado...

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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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