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Ferrite heat resisting steel and manufacture method thereof

A manufacturing method and technology of heat-resistant steel, applied in the field of ferritic heat-resistant steel and its manufacturing, can solve the problems of reducing the impact toughness of materials, and achieve the effects of good thermal oxidation resistance, good durable strength, and good impact toughness

Inactive Publication Date: 2011-05-04
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the prior art, there are patent documents recording 10-13% Cr ferritic heat-resistant steel, such as the Japanese patent application whose publication number is JP09013150A discloses a ferritic heat-resistant steel, and its chemical composition requirement is: C: 0.05 -0.18%, Si: 0.1-0.5%, Mn≤0.2%, S≤0.005%, Cu: 0.5-3%, Ni: 0.05-1%, Cr: 10.0-13.0%, (Mo+W / 2): 0.5-3.0%, V: 0.1-0.5%, Nb: 0.05-0.25%, B: 0.001-0.02%, Al: 0.003-0.04% and N: 0.04-0.15%, can also contain Co, Ti, Ca, Mg And rare earth and other elements, the addition of Ni will reduce the Ac1 transformation point of steel, which will limit the increase of tempering temperature, which is not good for improving the long-term durability at high temperature. At the same time, manganese can promote deoxidation and fix sulfur, excessively reducing the content of Mn Will reduce the impact toughness of the material

Method used

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  • Ferrite heat resisting steel and manufacture method thereof
  • Ferrite heat resisting steel and manufacture method thereof
  • Ferrite heat resisting steel and manufacture method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] According to the composition of Example 1 in Table 1, the laboratory molten steel of 50Kg Example 1 was obtained in a vacuum smelting furnace and cast into an ingot.

[0029] The obtained steel ingot was heated to 1180 degrees, then forged into a steel plate with a thickness of 50 mm, air-cooled, then heated to 1180 degrees, and rolled into a steel plate with a thickness of 14 mm.

[0030]The steel plate is subjected to 1080-degree normalizing treatment and 780-degree tempering treatment.

[0031] according to figure 1 As shown, samples were taken along longitudinal direction 01 for room temperature impact test, samples were taken along rolling direction 02 for durability tests at 650°C, 140Mpa and 650°C, 100Mpa, and impact tests were carried out at 0°C after aging treatment at 650°C for 5000 hours. The results are shown in Table 2.

[0032] It can be seen from Table 2 that the durable life of the steel in this example reaches 2145 hours at 650°C and 140Mpa; the durab...

Embodiment 2

[0034] According to the composition of Example 2 in Table 1, the laboratory molten steel of 50Kg Example 2 was obtained in a vacuum smelting furnace and cast into an ingot.

[0035] The obtained steel ingot was heated to 1180 degrees, then forged into a steel plate with a thickness of 50 mm, air-cooled, then heated to 1180 degrees, and rolled into a steel plate with a thickness of 14 mm.

[0036] The steel plate is subjected to 1080-degree normalizing treatment and 780-degree tempering treatment.

[0037] according to figure 1 As shown, samples were taken along longitudinal direction 01 for room temperature impact test, samples were taken along rolling direction 02 for durability tests at 650°C, 140Mpa and 650°C, 100Mpa, and impact tests were carried out at 0°C after aging treatment at 650°C for 5000 hours. The results are shown in Table 2.

[0038] It can be seen from Table 2 that the durable life of the steel in this embodiment reaches 2103 hours at 650°C and 140Mpa; the d...

Embodiment 3

[0040] According to the composition of Example 3 in Table 1, the laboratory molten steel of 50Kg Example 3 was obtained in a vacuum smelting furnace and cast into an ingot.

[0041] The obtained steel ingot was heated to 1180 degrees, then forged into a steel plate with a thickness of 50 mm, air-cooled, then heated to 1180 degrees, and rolled into a steel plate with a thickness of 14 mm.

[0042] The steel plate is subjected to 1080-degree normalizing treatment and 780-degree tempering treatment.

[0043] according to figure 1 As shown, samples were taken along longitudinal direction 01 for room temperature impact test, samples were taken along rolling direction 02 for durability tests at 650°C, 140Mpa and 650°C, 100Mpa, and impact tests were carried out at 0°C after aging treatment at 650°C for 5000 hours. The results are shown in Table 2.

[0044] It can be seen from Table 2 that the durable life of the steel in this embodiment reaches 2481 hours at 650°C and 140Mpa; the d...

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Abstract

The invention discloses a ferrite heat resisting steel comprising the following chemical constituents in percentage by weight: 0.05-0.15% of C, 0.10-0.50% of Si, 0.25-1.0% of Mn, 10.0-13.0% of Cr, 0.10-1.0% of Mo, 0.10-0.50% of V, 0.01-0.10% of Nb, 0.50-3.0% of W, 0.50-3.0% of Co, 0.10-1.0% of Cu, 0.001-0.008% of B, 0.04-0.12% of N, 0.005-0.2% of rare earth element and the balance of Fe and inevitable impurities. The manufacture method of the heat resisting steel is characterized in that normalization is carried out at the temperature of 1040-1100 DEG C, and tempering is carried out at the temperature of 740-800 DEG C.

Description

technical field [0001] The invention relates to a ferritic heat-resistant steel and its manufacturing method, in particular to a ferritic system with good oxidation resistance, good aging impact performance and excellent high-temperature strength at a high temperature exceeding 600°C Heat-resistant steel and method for its manufacture. Background technique [0002] In recent years, nuclear power generation equipment represented by boilers and steam turbines for power generation, chemical industry equipment, etc., have become more and more demanding on high-temperature performance of materials in order to be able to use them for a long time under high temperature and high pressure. Compared with austenitic heat-resistant steel, ferritic heat-resistant steel is often used in high-temperature parts because of its lower price, lower thermal expansion rate, and better thermal fatigue resistance. With the deepening of the harshness of the use environment, the requirements for the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/32C21D1/28C21D1/18C21D10/00
Inventor 王起江洪杰
Owner BAOSHAN IRON & STEEL CO LTD
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