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Ferritic heat-resistant steel and manufacturing method thereof

A manufacturing method and technology of heat-resistant steel, applied in the field of steel manufacturing, can solve the requirements that cannot meet the application environment of ferritic heat-resistant steel, high-temperature oxidation resistance, high-temperature creep resistance and high-temperature durability of ferritic heat-resistant steel Unfavorable strength, increased manufacturing cost, etc.

Active Publication Date: 2011-07-20
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] In summary, δ ferrite will be produced under high temperature conditions during the preparation of ferritic heat-resistant steel with 11-13% Cr, which has great influence on the high-temperature oxidation resistance, high-temperature creep resistance and high-temperature performance of ferritic heat-resistant steel. Durable strength is unfavorable and cannot meet the existing requirements for the application environment of ferritic heat-resistant steel
The existing technology often suppresses the generation of δ ferrite by adding some austenite-forming elements such as Ni, Co, Cu, C, etc., but this often leads to the reduction of other properties of ferritic heat-resistant steel, and Co, etc. Elements are expensive, which will greatly increase the manufacturing cost of steel

Method used

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  • Ferritic heat-resistant steel and manufacturing method thereof
  • Ferritic heat-resistant steel and manufacturing method thereof
  • Ferritic heat-resistant steel and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Table 2 shows the chemical compositions of the steels of the various embodiments of the present invention and comparative examples.

[0049] Smelted under vacuum to obtain 50Kg laboratory molten steel with the following mass percentage chemical composition: C0.11; Si 0.38; Mn 0.21; Cr 11.49; Mo 0.55; Co 1.2; W 2.1; 0.0032; V 0.21, the balance is Fe and unavoidable impurities, and the chemical composition of steel satisfies the relational formula Cr+2Mo+W-40C-30N-Co-0.5Cu=7.225. It is then cast into ingots.

[0050] The steel ingot obtained above was heated to 1190°C, forged into a steel plate with a thickness of 50mm, air-cooled, then heated to 1200°C, rolled into a steel plate with a thickness of 15mm, and the total elongation was 3.3. Obtain required metallographic samples in the longitudinal direction of the obtained steel plate and carry out metallographic erosion, and then detect under an optical microscope to measure the delta ferrite content and the average equi...

Embodiment 2

[0054] The mass percentages of the chemical components in the steel of this example are: C 0.12; Si 0.31; Mn 0.22; Cr 11.91; Mo 0.4; Co 2.06; W 1.98; The balance is Fe and unavoidable impurities.

[0055] The chemical composition of the steel satisfies the relational formula Cr+2Mo+W-40C-30N-Co-0.5Cu=6.32.

[0056] The δ ferrite content in the steel is 2.0%, and the average equivalent diameter of δ ferrite grains is 10 μm.

[0057] The durable life of the steel in this example reaches 1687 hours at 650°C 140Mpa, 11065 hours at 650°C 100Mpa, and the impact toughness reaches 77J / cm after aging at 650°C for 10,000 hours 2 .

[0058] Other operations are the same as in Example 1.

Embodiment 3

[0060] The mass percent content of each chemical component in this example is: C 0.11; Si 0.5; Mn 0.45; Cr 11.56; Mo 0.67; Co 2.77; W 2.06; The amount is Fe and unavoidable impurities.

[0061] The chemical composition of the steel satisfies the relational formula Cr+2Mo+W-40C-30N-Co-0.5Cu=5.72.

[0062] The delta ferrite content of the steel is 0.0%.

[0063] The durable life of the steel in this example reaches 1698 hours at 650°C 140Mpa, the durable life at 650°C 100Mpa reaches 10952 hours, and the impact toughness after aging at 650°C for 10,000 hours reaches 74J / cm 2 .

[0064] Other operations are the same as in Example 1.

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Abstract

The present invention discloses ascalloy which comprises the following chemical components by weight percentage: 0.05 to 0.15 of C, 0.1 to 0.5 of Si, 0.1 to 1.0 of Mn, 11.0 to 13.0 of Cr, 0.1 to 1.0 of Mo, 0.10 to 0.30 of V, 0.01 to 0.20 of Nb, 0.1 to 3.0 of W, 0.5 to 3.0 of Co, 0.1 to 1.0 of Cu, 0.001 to 0.008 of B, 0.01 to 0.11 of N, less than or equal to 0.03 of Al, less than or equal to 0.030 of P, less than or equal to 0.015 of S and the balance of Fe and inevitable of impurities. The chemical components meet a relational expression: Cr+2Mo+W-40C-30N-Co-0.5Cu is less than 7.5. The preparation method comprises the steps that high-temperature deformation processing is performed at the upper limitation of the temperature of 1200 DEG C, and the total elongation percentage is more than or equal to 3. The ascalloy obtained by the present invention has favorable ageing rear toughness, heat oxidation resistance and steam etching.

Description

technical field [0001] The invention relates to the field of iron and steel manufacturing, in particular to a ferritic heat-resistant steel. Background technique [0002] Nuclear power generation equipment and chemical industrial equipment, represented by boilers and steam turbines for power generation, are often made of austenitic heat-resistant steel or ferritic heat-resistant steel, so that these devices can be used for a long time under high temperature and high pressure environment . Ferritic heat-resistant steel is mostly used in high-temperature parts because of its cheap price, low thermal expansion rate, and good thermal fatigue resistance. [0003] At present, ferritic heat-resistant steel mainly includes steel types such as T / P91, T / P92, T / P911, and T / P122. Among the steels, T / P91, T / P92, and T / P911 contain 9% Cr. Others believe that such Cr content is insufficient to resist thermal oxidation and / or steam corrosion above 600°C. Increasing the Cr content in ferr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/32C21D6/00C21D7/13C21D1/28
Inventor 王起江洪杰
Owner BAOSHAN IRON & STEEL CO LTD