Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Heat-resistant stainless steel with high-lasting strength and manufacturing method thereof

A heat-resistant stainless steel, durable strength technology, used in manufacturing tools, temperature control, heat treatment furnaces, etc., can solve the problems of not fully meeting the actual working conditions of ultra-supercritical boilers, insufficient durable strength, etc., and achieve good high temperature corrosion resistance. , The effect of improving the grain boundary structure and improving the performance

Active Publication Date: 2010-05-12
SHANXI TAIGANG STAINLESS STEEL CO LTD
View PDF0 Cites 33 Cited by
  • 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 high-temperature creep performance and insufficient durable strength.
Although the high-temperature creep performance and durable strength of HR3C stainless steel for ultra-supercritical boilers have been improved due to the addition of N and Nb elements, they still cannot fully meet the actual working conditions of ultra-supercritical boilers.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The mass percentage proportioning ratio of the composition of the heat-resistant stainless steel embodiment of this high durable strength is:

[0040] Cr 25.03 Ni 18.05 Si 0.18 Mn 0.85

[0041] P 0.020 S 0.001 C 0.054 N 0.22

[0042] La 0.01 Nb+Ta 0.45 (99.88% and 0.12% for Nb and Ta respectively)

[0043] The rest is Fe and unavoidable impurities, of which O is 0.006%.

[0044] The above-mentioned molten steel is poured into a steel ingot of 400×400×1800, and 10 high-temperature endurance test samples of 8×3×20 (gauge length) are taken from the steel ingot, and the same heat treatment as the seamless steel pipe is performed, that is, 1175°C× 30min and then cooled down to room temperature at a speed of 2000°C / hr or more. Set different test stress values, conduct high-temperature endurance test at 700°C, and obtain the fracture time of each sample. The time to rupture of all the above samples is extrapolated on the logarithmic-stress value diagram of the durability t...

Embodiment 2

[0047] The mass percentage proportioning ratio of the composition of the heat-resistant stainless steel embodiment of this high durable strength is:

[0048] Cr 25.55 Ni 17.61 Si 0.23 Mn 1.06

[0049] P 0.015 S 0.001 C 0.048 N 0.25

[0050] La 0.04 Nb+Ta 0.46 (99.95% and 0.05% for Nb and Ta respectively)

[0051] The rest is Fe and unavoidable impurities, of which O is 0.005%.

[0052] The above-mentioned molten steel is poured into a steel ingot of 400×400×1800, and 10 high-temperature endurance test samples of 8×3×20 (gauge length) are taken from the steel ingot, and the same heat treatment as the seamless steel pipe is performed, that is, 1175°C× 30min and then cooled down to room temperature at a speed of 2000°C / hr or more. Set different test stress values, carry out high-temperature endurance test at 700°C, and obtain the fracture time of each sample. The time to rupture of all the above samples is extrapolated on the logarithm-stress value diagram of the durability t...

Embodiment 3

[0055] The mass percentage proportioning ratio of the composition of the heat-resistant stainless steel embodiment of this high durable strength is:

[0056] Cr 25.26 Ni 17.94 Si 0.25 Mn 0.94

[0057] P 0.016 S 0.001 C 0.051 N 0.24

[0058] La 4.26 Nb+Ta 0.42 (99.93% and 0.07% for Nb and Ta respectively)

[0059] The rest is Fe and unavoidable impurities, of which O is 0.004%.

[0060] The above-mentioned molten steel is poured into a steel ingot of 400×400×1800, and 10 high-temperature endurance test samples of 8×3×20 (gauge length) are taken from the steel ingot, and the same heat treatment as the seamless steel pipe is performed, that is, 1175°C× After 30min, cool down to room temperature at a rate above 2000°C / hr. Set different test stress values, and conduct a high-temperature endurance test at 700°C to obtain the fracture time of each sample. The fracture time of all the above samples is divided into the endurance time Extrapolation on the log-stress value graph of , ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a heat-resistant stainless steel with high-lasting strength and a manufacturing method thereof. The heat-resistant stainless steel includes the following components by percentage: 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, and 0.20-0.60 of M, wherein M is Nb and Ta. The manufacturing method comprises the following steps: 1. smelting: smelting molten steel in accordance with component requirements of the stainless steel; 2. pouring billet steel; 3. hot-rolling the billet steel: a. heating, the temperature of a uniform temperature section in a furnace is at the temperature of 1130 DEG C plus or minus 50 DEG C, and the soaking time is 80 minutes plus or minus 10 minutes; and b. rolling or forging, the initial rolling / initial forging temperature is at the temperature of 1100 DEG C plus or minus 50 DEG C, and the finishing rolling / finishing forging temperature is at the temperature of 860 DEG C plus or minus 50 DEG C; and 4. heat treatment, the solid solution temperature is at the temperature of 1175 DEG C plus or minus 75 DEG C, and water quenching after heat preservation. Through deduction by tests after sampling the stainless steel manufactured by the method, manufactured seamless tubes can satisfy the use requirements of superheaters and reheaters of ultra-supercritical power station boilers.

Description

technical field [0001] The invention relates to a heat-resistant stainless steel with high durability 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 of the boiler can be adopted. The influence of boiler operating parameters on power plant efficiency and power supply coal consumption is show...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/58B21B37/74B21J1/04C21D9/00
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com