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HIC-resistant heat resistant steel in iron element system and preparation process thereof

A preparation process and technology of heat-resistant steel, applied in the field of ferritic heat-resistant steel and its manufacturing process, can solve the problems of not mentioning anti-HIC performance, not involving HIC performance, high temperature performance limitation, etc., and reaching the thickness specification range The effect of wide, small number, and small alloy types

Inactive Publication Date: 2011-09-14
INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Faced with such a huge demand, various enterprises and scientific research institutes are intensively carrying out corresponding research, and some new technologies have emerged, for example: the invention patent with publication number CN1139459A mentions a kind of Steel with good high-temperature creep performance and its production method, but the steel designed in this patent has a variety of alloy components. It is found from the analysis of the examples that the cost is not easy to control when adding higher W or Zr; the invention patent of publication number CN1904120A is designed The addition of high Ni and W in the composition will cause a certain cost pressure. Because the heat treatment process it adopts is quenching + tempering, this leads to certain restrictions on its high temperature performance, and this product cannot be used for higher temperature work. In the environment; the patent of invention with the publication number CN1461354 relates to a heat-resistant steel with nickel added, but does not mention the HIC resistance of the material. Its examples show that the steel mainly improves the heat resistance of the material by adding a large amount of Cr , also added a large amount of W, and the cost is relatively high; the invention patents of publication numbers CN1151766, CN101565798 and CN1169164 all prepare ferritic heat-resistant steel by adding a large amount of Cr or other alloys, and these methods have cost problems , and the anti-HIC performance is not involved

Method used

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  • HIC-resistant heat resistant steel in iron element system and preparation process thereof
  • HIC-resistant heat resistant steel in iron element system and preparation process thereof
  • HIC-resistant heat resistant steel in iron element system and preparation process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Example 1 The chemical components of the HIC-resistant ferritic heat-resistant steel are: C: 0.1-0.15%, Si: 0.2-0.5%, Mn: 0.3-0.6%, Cr: 2.0-2.5%, Mo: 0.9-1.1%, S≤0.003% and P≤0.010%, the rest is Fe and unavoidable impurities; the content of S, P and other impurity elements is strictly controlled in the steelmaking process. After calculation, the J coefficient of this steel is 33.5, and the X coefficient is 7.1; the rolling process is shown in Table 1:

[0044] The rolling process of table 1 embodiment 1

[0045]

[0046] The heat treatment process consists of two parts: normalizing and tempering. Normalizing process: heating temperature 930°C, holding time 1.6min / mm±10min, cooling speed controlled at 0.1~2°C / s; tempering process: heating temperature 720°C, The holding time is 2.5min / mm±10min, and air-cooled to room temperature.

[0047] The performance after heat treatment is shown in Table 2, and its metallographic structure refers to image 3 , TEM detection fou...

Embodiment 2

[0050] Example 2 The chemical components of the HIC-resistant ferritic heat-resistant steel are: C: 0.1-0.15%, Si: 0.2-0.5%, Mn: 0.3-0.6%, Cr: 2.0-2.5%, Mo: 0.9-1.1%, S≤0.003% and P≤0.010%, the rest is Fe and unavoidable impurities; the content of S, P and other impurity elements is strictly controlled in the steelmaking process. After calculation, the J coefficient of this steel is 33.2, and the X coefficient 7.0; during the hot-rolled plate production process, the slab heating temperature: 1120°C; during the controlled rolling process, the second rolling temperature is 870°C, the end rolling temperature is 810°C, and then the cooling rate is 0.5-3°C / s to room temperature.

[0051] The heat treatment process consists of two parts: normalizing and tempering. Normalizing process: heating temperature 920°C, holding time 1.6min / mm±10min, cooling speed controlled at 0.1-2°C / s; tempering process: heating temperature 710°C, The holding time is 2.5min / mm±10min, and air-cooled to roo...

Embodiment 3

[0054] Example 3 The chemical components of the HIC-resistant ferritic heat-resistant steel are: C: 0.1-0.15%, Si: 0.2-0.5%, Mn: 0.3-0.6%, Cr: 2.0-2.5%, Mo: 0.9-1.1%, S≤0.003% and P≤0.010%, the rest is Fe and unavoidable impurities; the content of S, P and other impurity elements is strictly controlled in the steelmaking process, and the J coefficient of this steel is calculated to be 33.6, and the X coefficient 7.5; during the hot-rolled plate production process, the slab heating temperature: 1130°C; during the controlled rolling process, the second rolling temperature is 875°C, the end rolling temperature is 815°C, and then the cooling rate is 0.5-3°C / s to room temperature.

[0055] The heat treatment process consists of two parts: normalizing and tempering. Normalizing process: heating temperature 910°C, holding time 1.6min / mm±10min, cooling speed controlled at 0.1-2°C / s; tempering process: heating temperature 710°C, The holding time is 2.5min / mm±10min, and air-cooled to r...

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Abstract

The invention relates to hydrogen induced cracking (HIC)-resistant heat resistant steel in an iron element system and a preparation process thereof. The steel comprises the following components in percentage by weight: 0.1 to 0.15 percent of C, 0.2 to 0.5 percent of Si, 0.3 to 0.6 percent of Mn, 2.0 to 2.5 percent of Cr, 0.9 to 1.1 percent of Mo, less than or equal to 0.003 percent of S, less than or equal to 0.010 percent of P and the balance of iron and impurities. The preparation process comprises a heating process, a hot rolling process and a heat treatment process sequentially, wherein the heat treatment process comprises a normalizing process and a tempering process. The steel has a high comprehensive mechanical property, a high low-temperature impact property, high HIC resistance and relatively low tempering tendering sensitivity; and the preparation process is simple, easy to operate, low in cost, high in yield and wide in thickness specification ranges, and a small number of alloys with a few varieties are added.

Description

technical field [0001] The invention relates to a ferritic heat-resistant steel and a manufacturing process thereof, in particular to a ferritic heat-resistant steel with low temper embrittlement sensitivity and HIC resistance and a manufacturing process thereof. Background technique [0002] With the rapid development of my country's national economy, the demand for petroleum products is increasing day by day. At the same time, in order to meet the requirements of environmental protection, the quality requirements of petroleum products are also getting higher and higher. In order to adapt to this situation, the hydrogenation refining process technology has been more and more widely used, and the important equipment in the hydrogenation unit, that is, a large part of the main materials of the high-pressure equipment such as the hydrogenation reactor and the high-pressure heat exchanger, needs to be used. Hydrogen thick steel plate. This steel has very strict requirements on...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/22C21D8/02
Inventor 王炜赵文贵杨汉华燕平镇凡曲锦波
Owner INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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