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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 the existing ultra-supercritical boiler superheater and reheater seamless tube, the invention provides a heat-resistant stainless steel seamless tube and its Preparation

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

Embodiment 1-6

[0074] (1) Smelting

[0075] Adopt VIM+ESR technology and electric furnace+AOD+LF technology to smelt the ingot of Φ498 respectively, the ingot composition of each embodiment and comparative example (S31042) is shown in Table 1 (embodiment 1-3 has adopted VIM+ESR smelting technology, Embodiment 4-6 and comparative examples have adopted electric furnace+AOD+LF smelting process).

[0076] Table 1 embodiment 1-6 and comparative example chemical composition (percentage by weight)

[0077] Element

C

Si

mn

P

S

Cr

Ni

Cu

W

Nb

N

Mo

B

Example 1

0.07

0.20

0.15

0.013

0.001

22.35

25.04

3.11

3.62

0.45

0.20

0.10

0.005

Example 2

0.08

0.16

0.20

0.011

0.002

21.17

24.54

2.00

2.00

0.48

0.17

0.05

0.004

Example 3

0.06

0.24

0.21

0.008

0.001

23.87

26.13

2.72

2.54

0.33

0.23

0.15

0.002

Example 4

0.04

0...

Embodiment 7

[0085] The chemical composition of the heat-resistant stainless steel pipe of the present embodiment is identical with embodiment 1, and preparation method is as follows:

[0086] (1) Smelting

[0087] With embodiment 1.

[0088] (2) Thermal processing of tube billets

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

[0090] (3) Steel pipe thermal processing

[0091] The tube blank is processed into capillary tube by hot extrusion method, the diameter of the through hole in the machining center is 20mm, and a 33.5° bel...

Embodiment 8

[0095] The chemical composition of the heat-resistant stainless steel pipe of the present embodiment is identical with embodiment 1, and preparation method is as follows:

[0096] (1) Smelting

[0097] With embodiment 1.

[0098] (2) Thermal processing of tube billets

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

[0100] (3) Steel pipe thermal processing

[0101] The tube blank is processed into capillary tube by hot extrusion method, the diameter of the through hole in the machining center is 30mm, and a 33.5° b...

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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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