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Seamless steel tube for ultra supercritical boiler and manufacturing method thereof

A technology for ultra-supercritical boilers and seamless steel pipes, applied in the direction of manufacturing tools, furnaces, furnace types, etc., can solve the problems of insufficient durable strength and cannot fully meet the actual working conditions of ultra-supercritical boilers, and achieve good high-temperature corrosion resistance Performance, performance improvement, effect of improving grain boundary structure

Active Publication Date: 2010-07-21
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, in the application, it was found that HR3C stainless steel seamless pipes used as ultra-supercritical boiler superheaters and reheaters still have many pipe burst accidents due to insufficient durable strength.
Although the durable strength of HR3C stainless steel for ultra-supercritical boilers has been improved due to the addition of N and Nb elements, it still cannot fully meet the actual working conditions of ultra-supercritical boilers.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The composition mass percentage ratio of the seamless steel pipe embodiment for the ultra-supercritical boiler superheater and reheater is:

[0041] Cr 25.03 Ni 18.05 Si 0.18 Mn 0.85

[0042] P 0.020 S 0.001 C 0.054 N 0.22

[0043] La 0.01 Nb+Ta 0.45 (99.88% and 0.12% of Nb and Ta respectively), the rest is Fe and unavoidable impurities, of which O is 0.006%.

[0044] In this example, the microstructure after solution treatment is austenite + finely dispersed second phase, and the grain size is 4-7 grades. The overall size is generally 3000-12000mm in length, 5-500mm in outer diameter, and 0.5-30mm in wall thickness. The length of the present embodiment is 4000mm, the outer diameter is φ106mm, and the wall thickness is 12mm.

Embodiment 2

[0046] The composition mass percentage ratio of the seamless steel pipe embodiment for the ultra-supercritical boiler superheater and reheater is:

[0047] Cr 25.55 Ni 17.61 Si 0.23 Mn 1.06

[0048] P 0.015 S 0.001 C 0.048 N 0.25

[0049] La 0.04 Nb+Ta 0.46 (99.95% and 0.05% for Nb and Ta respectively)

[0050] The rest is Fe and unavoidable impurities, of which O is 0.005%.

[0051] In this example, the microstructure after solution treatment is austenite + finely dispersed second phase, and the grain size is 4-7 grades. The overall size is generally 3000-12000mm in length, 5-500mm in outer diameter, and 0.5-30mm in wall thickness. The size of this embodiment is 5000mm in length, φ57mm in outer diameter, and 8mm in wall thickness.

Embodiment 3

[0053] The composition mass percentage ratio of the seamless steel pipe embodiment for the ultra-supercritical boiler superheater and reheater is:

[0054] Cr 25.26 Ni 17.94 Si 0.25 Mn 0.94

[0055] P 0.016 S 0.001 C 0.051 N 0.24

[0056] La 4.26 Nb+Ta 0.42 (99.93% and 0.07% for Nb and Ta respectively)

[0057] The rest is Fe and unavoidable impurities, of which O is 0.004%.

[0058] In this example, the microstructure after solution treatment is austenite + finely dispersed second phase, and the grain size is 4-7 grades. The overall size is generally 3000-12000mm in length, 5-500mm in outer diameter, and 0.5-30mm in wall thickness. The size of this embodiment is 12000mm, the outer diameter is φ17mm, and the wall thickness is 2.45mm.

[0059] Manufacturing method embodiment one

[0060] What present embodiment makes is seamless steel pipe embodiment one, and it comprises following steps in sequence:

[0061] 1. Smelting

[0062] After the pretreated molten iron is smelt...

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Abstract

The invention relates to a seamless steel tube for an ultra supercritical boiler and a manufacturing method thereof. The seamless steel tube comprises components in percentage by weight: 24.00-26.00% of Cr, 17.00-23.00% of Ni, 0.05-0.75% of Si, 0.15-2.00% of Mn, less than or equal to 0.030% of P, less than or equal to 0.030% of S, 0.04-0.10% of C, 0.15-0.35% of N, 0.01-5.00% of RE, 0.20-0.60% of M, the balance of Fe and unavoidable impurities. The manufacturing method mainly comprises the following steps: smelting molten steel according to component requirements and poring the molten steel to form billet steel; then hot working the billet steel to form a solid-core tube blank, preparing the billet steel into a hollow tube blank and preparing the tube blanks into the seamless steel tube by hot extrusion; carrying out stretch rolling, shot blasting, discarding, and sawing, and finally carrying out solution treatment. The seamless steel tube of the invention can meet the service environment requirements of an ultra supercritical boiler superheater and an ultra supercritical boiler reheater.

Description

technical field [0001] The invention relates to a seamless steel pipe for an ultra-supercritical boiler and a manufacturing method thereof, in particular to a seamless steel pipe for a superheater and a reheater of an ultra-supercritical boiler and a manufacturing method thereof. Background technique [0002] Rapid economic development has led to an ever-increasing demand for electricity. According to the current level of technological development and the composition of primary energy, thermal power generation is still the most important way of power generation. Thermal power generation consumes a large amount of non-renewable fossil energy such as coal and emits SO X , NO X , CO 2 Pollutants such as greenhouses and acid gases make us pay a huge environmental price for economic development. In order to reduce the coal consumption per unit of electricity and the environmental cost in the process of thermal power generation, the method of increasing the working parameters ...

Claims

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Application Information

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IPC IPC(8): C22C38/58C22C38/48C21D9/08B21C37/06
Inventor 董盼王立新方旭东范光伟孙铭山徐鸿麟
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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