Corrosion resistant connection core of Baoji Dingding titanium | titanium and titanium alloy flange under extreme conditions

In key fields such as chemical anticorrosion, marine engineering, aerospace, food and medicine, as the "connection hub" of pipeline and equipment, the performance of flange directly determines the sealing, safety and service life of the system. Traditional carbon steel and stainless steel flanges are prone to corrosion leakage and strength degradation in extreme environments such as strong acid, high salt and high temperature. The TA2 pure titanium and TC4 titanium alloy flanges developed by Baoji Dingding titanium, relying on the material advantages and precision manufacturing technology of "China Titanium Valley", strictly comply with the standards such as gb/t 12224, ASTM B564 and hg/t 20592, and through the process of "overall forging+precision turning+surface strengthening", the corrosion rate is ≤ 0.0001mm/year, the sealing pressure is ≥ 25MPa, and they are perfectly suitable for all kinds of harsh working conditions. They have served Wanhua chemical, CNOOC, COMAC and other leading enterprises in batch.

1、 Core performance advantage: titanium material reconstruction flange connection standard

According to the different requirements of different working conditions for flange "corrosion resistance, bearing capacity, sealing and safety", TA2 pure titanium and TC4 titanium alloy form a complementary performance system, which achieves a qualitative breakthrough compared with the traditional metal flange:

TA2 pure titanium flange: broad spectrum corrosion resistance

Purity ≥ 99.6% industrial pure titanium, resistant to hydrochloric acid, sulfuric acid, acetic acid, chlor alkali and other corrosive media; The corrosion rate in 5% sulfuric acid solution is ≤ 0.0001 mm/year, and there is no risk of intergranular corrosion. It is the preferred choice in the chemical and food fields.

TC4 titanium alloy flange: tough and temperature resistant benchmark

The composition of Ti-6Al-4V is optimized, the tensile strength is ≥ 960mpa, and the temperature resistance range is -200 ℃~350 ℃; The strength retention rate at 300 ℃ is ≥ 90%, which can withstand 10MPa high pressure without deformation, and is suitable for high temperature and high pressure system.

Reliable sealing and lightweight

The sealing surface is precisely turned to RA ≤ 0.8 μ m, and the initial sealing rate is high with graphite/metal gasket; The density is only 4.51g/cm ³, which reduces the weight by 45% compared with the stainless steel flange and reduces the equipment load and installation cost.

Safety and long-term effectiveness

The whole forging is free of sand holes and pores, and the hydraulic test (1.5 times the rated pressure) is free of leakage; Service life ≥ 10 years, 5 times longer than carbon steel flange, significantly reducing maintenance costs.

2、 Full specification system: adapt to global standards and full scene requirements

In combination with pipeline diameter, pressure grade, connection mode and regional standards, it provides flat welding, butt welding, socket welding, loose sleeve and other full types of flanges, covering dn15-dn2000 specifications, and supports customization of national standards, American standards and European standards:

3、 Core application scenario: connection security under extreme conditions

1. chemical industry: anti corrosion barrier of strong acid pipeline

Chemical acid and alkali transmission pipeline is the hardest hit area for flange corrosion failure. TA2 pure titanium flange completely solves this pain point:

-Provide DN500 TA2 pure titanium butt welding flange for Wanhua chemical sulphuric acid conveying system, with PN10 pressure rating, which has been running continuously in 5% sulphuric acid medium for 3 years without corrosion and leakage. The service life is 6 times longer than that of 316L stainless steel flange previously used (corrosion perforation occurs in an average of 6 months), and the annual loss of equipment shutdown and maintenance is reduced by more than 800000 yuan;

-The RF type design of flange sealing surface with flexible graphite gasket has a high initial sealing rate, which solves the potential safety hazard of "acid and alkali leakage" of traditional flange. The incidence of corrosion accidents in the workshop has been reduced from 12% to 0, and has passed the safety standardization certification in the chemical industry.

2. marine engineering: corrosion resistance support in high salt environment

The offshore platform and seawater desalination equipment are exposed to high salt medium for a long time, and the passivation TA2 flange shows excellent corrosion resistance:

-The DN1000 TA2 passivated titanium flange with PN16 pressure rating is equipped for the oil pipeline of a CNOOC Bohai Drilling Platform. The corrosion rate is only 0.00008mm/year after 5000 hours of seawater immersion test. Compared with the carbon steel flange (requiring monthly painting maintenance), the maintenance cycle is extended from 1 month to 12 months, and the annual maintenance cost is reduced by 600000 yuan;

-Under the sea breeze condition of grade 15 caused by Typhoon "dushuri" in 2023, the flange connection is free of looseness, and the sealing pressure is stable at 20MPa, ensuring the continuous operation of the platform oil transportation system and winning the title of "high quality supplier" of CNOOC.

3. high temperature and high pressure field: strong, tough and stable core connection

Thermal power, aviation and other high-temperature and high-pressure systems have strict requirements on flange strength and temperature resistance. TC4 titanium alloy flange is perfectly matched:

-The DN300 TC4 titanium alloy butt welding flange with PN25 pressure grade is provided for the high-pressure steam pipeline of a thermal power enterprise. It operates continuously for 1 year at 300 ℃ and 10MPa high pressure. The strength retention rate is 92%, without deformation and leakage. Compared with the high-temperature alloy flange, the weight is reduced by 45%, and the load of the pipeline support is reduced;

-It is equipped with DN50 TC4 precision flange for the hydraulic system of a COMAC aircraft. The weight is only 1.2kg, which is 50% lighter than the stainless steel flange. The non-magnetic interference characteristics ensure the stable signal transmission of the hydraulic system, and it has passed the certification of aerospace parts.

4. food and medicine: safe and clean transportation guarantee

The food and pharmaceutical industry has extremely high requirements for flange cleanliness and safety, and the food grade TA2 flange meets the requirements:

-The DN200 food grade TA2 flange is provided for the liquid medicine delivery pipeline of a large pharmaceutical enterprise. The sanitary polishing RA is ≤ 0.4 μ m, has no dead corner structure, and is easy to clean and disinfect. It meets the standard of GB 4806.11. The dissolution of titanium in the liquid medicine is ≤ 0.001mg/l, which is far below the national limit;

-Compared with the traditional stainless steel flange, TA2 flange avoids the risk of chromium and nickel dissolution, and the drug qualification rate has increased from 98.5% to 99.9%, which has become the designated flange supplier of the vaccine production line of the enterprise.

4、 Whole process quality assurance: strict control from raw materials to delivery

1. raw material traceability control: adopt high-purity sponge titanium ≥ 99.8%, TA2 purity ≥ 99.6%, TC4 strictly control the content of Al (5.5%-6.75%) and V (3.5%-4.5%), and each batch of raw materials is attached with ICP-MS composition report and mine traceability source code to ensure stable performance;

2. precision manufacturing process: the "vacuum melting+integral forging" process is adopted to improve the density of the material. The five axis CNC lathe is used to process the sealing surface and bolt holes, with a dimensional tolerance of ≤± 0.05mm. The surface passivation treatment forms an oxide film with a density of 99.9%, which strengthens the corrosion resistance;

3. full inspection and verification: all of them have passed the hydrostatic test (1.5 times the rated pressure), air tightness test, corrosion test (neutral salt spray/acid immersion), nondestructive testing (ut/mt/pt test, no internal defects), and each flange is attached with the inspection report and traceability code;

4. delivery and service guarantee: provide multilingual quality documents such as national standard and American Standard, and support multiple modes of transportation such as sea and land transportation; A professional technical team is equipped to provide flange installation guidance, sealing performance calibration services, and free maintenance and replacement within the warranty period.

Baoji Dingding titanium: the core supplier of titanium and titanium alloy flanges

The company is located in Baoji high tech Zone, the "China Titanium Valley". It has been engaged in the research, development and production of titanium and titanium alloy flanges for 15 years. It has four special production lines with an annual production capacity of 5000 tons. It has passed the ISO9001 quality management system, API 605 certification, FDA food contact certification and the qualification review of PetroChina, Sinopec and CNOOC suppliers. With the core advantages of "excellent material, high precision and complete service", the products are exported to more than 30 countries and regions such as Europe, America and Southeast Asia, and have become a reliable choice for flange connection under extreme working conditions.

Technical core: corrosion resistant process+precision dimension control

Capacity Guarantee: 500 tons/year, 30 days for urgent orders

Technical consultation: send working condition parameters+flange requirements to 530975155@qq.com , get the adaptation scheme within 2 hours