Heat-resistant stainless steel seamless pipe and preparation method thereof

A heat-resistant stainless steel and seamless tube technology, applied in the field of stainless steel, can solve the problems of poor thermal conductivity, lasting strength and oxidation resistance of the tube screen, and achieve the effect of good mechanical properties

Active Publication Date: 2018-01-23
TAIYUAN IRON & STEEL GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In order to solve the problems of poor heat conduction and expansion structure of the tube panel caused by the poor durable strength and oxidation resistance of t

Method used

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  • Heat-resistant stainless steel seamless pipe and preparation method thereof
  • Heat-resistant stainless steel seamless pipe and preparation method thereof
  • Heat-resistant stainless steel seamless pipe and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0073] Example 1-6

[0074] (1) Smelting

[0075] The VIM+ESR process and the electric furnace+AOD+LF process were used to smelt Φ498 ingots. The ingot composition of each example and comparative example (S31042) is shown in Table 1 (Examples 1-3 adopted the VIM+ESR smelting process, Examples 4-6 and comparative examples used electric furnace + AOD + LF smelting process).

[0076] Table 1 Examples 1-6 and comparative examples chemical composition (weight percentage)

[0077] ingredient

[0078] (2) Hot processing of tube blank

[0079] The ingot is opened by radial forging, the heating temperature is 1200℃, the heating time is 2min / mm×the ingot width, and it is kept at 1000℃ for 2 hours. The opening forging temperature is 1150℃, the final forging temperature is 980℃, the total forging ratio is 5, the deformation pass is 6, the initial pass deformation is 30%, the middle pass deformation is 50%, the final pass deformation is 5%, and the rest The secondary deformation is 30%.

[0080...

Example Embodiment

[0084] Example 7

[0085] The chemical composition of the heat-resistant stainless steel tube of this embodiment is the same as that of embodiment 1, and the preparation method is as follows:

[0086] (1) Smelting

[0087] The same as in Example 1.

[0088] (2) Hot processing of tube blank

[0089] The ingot is opened by free forging, the heating temperature is 1180℃, the heating time is 1min / mm×the ingot width, and it is kept at 1000℃ for 1 hour. The opening forging temperature is 1100℃, the final forging temperature is 950℃, the total forging ratio is 3, the deformation pass is 6, the initial pass deformation is 26%, the middle pass deformation is 41%, the final pass deformation is 9%, and the rest The secondary deformation is 20%.

[0090] (3) Hot processing of steel pipe

[0091] The tube blank is processed into a capillary tube by hot extrusion. The through hole diameter of the machining center is 20mm. One end face is chamfered with a 33.5° bell mouth. The ring furnace is preheate...

Example Embodiment

[0094] Example 8

[0095] The chemical composition of the heat-resistant stainless steel tube of this embodiment is the same as that of embodiment 1, and the preparation method is as follows:

[0096] (1) Smelting

[0097] The same as in Example 1.

[0098] (2) Hot processing of tube blank

[0099] The ingot is opened by rolling, the heating temperature is 1270℃, the heating time is 4min / mm×the ingot width, and it is kept at 1000℃ for 3 hours. The start rolling temperature is 1200℃, the final rolling temperature is 1500℃, the total forging ratio is 9, the deformation pass is 3, the initial pass deformation is 60%, the middle one pass deformation is 50%, the final pass deformation is 3%, and the rest passes The secondary deformation is 40%.

[0100] (3) Steel pipe thermal processing

[0101] The tube blank is processed into a capillary tube by hot extrusion. The through hole diameter of the machining center is 30mm, and a 33.5° bell mouth is processed with a flat head chamfer on one end....

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Abstract

The invention relates to the field of stainless steel, in particular to a heat-resistant stainless steel seamless pipe and a preparation method thereof. The heat-resistant stainless steel seamless pipe of the present invention, by weight percentage, includes: C 0.04-0.1%, Si≤0.4%, Mn≤0.5%, P≤0.03%, S≤0.02%, Cr 20-27%, Ni 23‑28%, Cu 2.0‑3.5%, W 2‑4%, Nb 0.2‑0.6%, N 0.1‑0.3%, Mo 0.05‑0.3%, B 0.002‑0.008%, the balance is Fe and other unavoidable impurity elements. The preparation method of the heat-resistant stainless steel seamless pipe of the present invention comprises the following steps: (1) smelting; (2) thermal processing of a tube blank; (3) thermal processing of a steel pipe; (4) cold processing of a steel pipe. The heat-resistant steel seamless pipe of the present invention has good mechanical properties, high-temperature durable strength, high-temperature oxidation resistance, high-temperature corrosion resistance and high-temperature structure stability, and can meet the use requirements of 630-650°C ultra-supercritical power plant boiler tubes .

Description

technical field [0001] The invention relates to the field of stainless steel, in particular to a heat-resistant stainless steel seamless pipe and a preparation method thereof. Background technique [0002] Energy is the cornerstone of economic development and social progress. Over the past 30 years, China's economy has been in a period of rapid development, and the rapid development of China's economy has increasingly urgent demand for energy. Judging from my country's "rich coal-less oil-lack of gas" natural resource reserves, this determines that the dominant position of coal power in my country's power supply structure will be difficult to change for a long time in the future. At the same time, China is currently the world's largest coal producer and consumer, and is also the world's largest carbon dioxide emitter. In order to cope with climate change, China is facing enormous pressure to reduce emissions. Parametric ultra-supercritical thermal power units are an import...

Claims

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Application Information

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IPC IPC(8): C22C38/42C22C38/44C22C38/48C22C38/54C22C38/02C22C38/04B21C37/06C21D8/10
Inventor 徐芳泓方旭东李阳王岩赵建伟夏焱
Owner TAIYUAN IRON & STEEL GROUP
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