[Technological breakthrough] Using innovative materials to solve pipeline application problems in extreme environments

- Jiangsu JEND TUBE Co.,Ltd.Successfully developed new high-temperature and low-temperature austenitic systems

Developed stainless steel and obtained national invention patents.

（A new type of austenitic stainless steel liquefied natural gas (LNG) pipeline using patented technology operates stably in an ultra-low temperature environment of -196 ℃）

一. Technical background: Extreme working conditions promote material revolution.
As the global energy, chemical, aerospace, and other industries expand into extreme environments such as deep space, deep sea, and polar regions, the problems of intergranular corrosion, low-temperature brittleness, and reduced high-temperature strength of traditional stainless steel materials under rapid temperature differences (-200 ℃ to 800 ℃) are becoming increasingly prominent. Jiangsu JEND TUBE Co., Ltd. has successfully developed the "High Temperature and Low Temperature Austenitic Stainless Steel and Manufacturing Method" (patent number: ZL202311367250.4) after 3 years to solve the problems in the industry. Through unique composition design and manufacturing processes, the material has achieved performance breakthroughs in extreme temperature environments.

二.Key technical point: Performance improvement
1. Material performance advantages

Core innovation points:
- Composition optimization: Adding microalloying elements such as Nb and Nb to suppress carbide precipitation at high temperatures and improve grain boundary stability.
- Process innovation: Adopting the "dual solution treatment+ultra-low temperature cold rolling" technology to transform crystalline particles

Refined to below 5 microns to improve low-temperature toughness.

二. Manufacturing process: precision controlled casting, high-quality
1.Technological process:
Material selection → Vacuum induced smelting → Continuous injection molding → Double solution treatment (1050 ℃ water cooling+850 ℃ tempering) → Ultra low temperature cold rolling (-50 ℃ environment) → Non destructive testing → Finished product
2.Technological innovation:
- Vacuum smelting technology: Control the oxygen content to ≤ 15ppm, reduce impurities, and improve material purity.
- Ultra low temperature cold rolling: Rolling at -50 ° C to form a high-density potentiometer structure, increasing low-temperature toughness by 40%.

(Cold rolling equipment detailed drawing)

三. Application scenario: Support upgrading advanced devices
1. Energy sector
- LNG ultra-low temperature transportation: No odor risk in -196 ℃ environment, suitable for liquefied natural gas storage tanks and transportation pipelines.
- Nuclear high-temperature circuit: When used for a long time at 800 ° C, the strength attenuation rate is less than 5%, ensuring safe operation of the reactor.
2. Chemical industry field
- Strong corrosive medium environment: in an acidic environment containing Cl corrocorrosion rate <0.01mm per year, life is extended by 3 times than conventional materials.
- High temperature decomposition device: capable of withstanding rapid cooling and heating cycles of 900 ° C in the ethylene decomposition furnace, reducing downtime and inspection frequency.
3. Exploration of Space and Polar Science.
- Liquid hydrogen and liquid oxygen rocket fuel pipelines: -253 ℃ passed liquid hydrogen environment simulation testing, meeting strict aerospace grade standards.
- The pipeline system of the Antarctic exploration base maintains good resilience in extreme environments of -80 ℃ to prevent the risk of freezing cracks.

(Site diagram of nuclear power plant pipelines)

五．The story behind R&D: Overcoming difficulties and strengthening the spirit of craftsmanship.
"Improving the low-temperature toughness of traditional austenitic stainless steel has always been a global challenge. Dr. Hou Xueling, Chief Materials Scientist of Jiangsu JEND TUBE Co., Ltd., said: "Through more than 1200 composition ratio experiments, the team finally discovered the synergistic effect of nitrogen and nickel microalloying, and successfully overcame the bottleneck by combining it with ultra-low temperature rolling technology. ”. ”

Client Authentication:
>In your polar scientific exploration ship pipeline renovation project, the new austenitic stainless steel material with high and low temperature resistance failed in the -180 ℃ impact test, completely replacing imported products!

六．Patent Value and Future Planning
Through this acquisition of national invention patent rights, Jiangsu JEND TUBE Co., Ltd. has achieved a leap from being a follower to a leader in the field of high-performance stainless steel. In the future, the company will:
1. Increase R&D investment, establish a "Extreme Environment Material R&D Center", and deepen the technical reserves for ultra-low temperature/ultra-high temperature scenarios.
2. Cooperate with Shanghai University to promote the "Deep Sea Ten Thousand Meter Pressure resistant Pipe" project.
By 2025, complete the EU PED certification and enter the international high-end market.

(Jiangsu JEND TUBE Co., Ltd. National Invention Patent Certificate)

Company Profile:
Jiangsu JEND TUBE Co., Ltd. has been focusing on the research and manufacturing of stainless steel and special steel pipes for 15 years. It has mature overall production equipment, complete testing equipment, and a perfect quality management system for stainless steel core pipes. Its products have passed multiple certifications such as IOS 9001, ASTM, GB, etc., serving more than 30 national energy and heavy industry enterprises worldwide.