quality Stainless Steel Seamless Pipes & Stainless Steel Butt Welded Pipe Fittings factory

Stainless steel flanges are widely used in piping systems due to their corrosion resistance, high strength, and durability.  They connect pipes, valves, pumps, and other equipment, ensuring leak-proof joints in high-pressure and high-temperature environments.  Below is a detailed breakdown of the most common pipe fittings used with stainless steel flanges, along with their functions, standards, and applications. 1.  Stainless Steel Pipes Stainless steel flanges are primarily used to connect stainless steel pipes in various industries, including: Oil & Gas (high-pressure pipelines, offshore platforms) Chemical Processing (acid, alkali, and solvent transport) Food & Beverage (hygienic piping, CIP/SIP systems) Pharmaceuticals (sterile fluid transfer) Water Treatment (desalination, wastewater systems) Common Stainless Steel Pipe Grades for Flanged Connections Grade Standard Key Properties Application 304/304L A312/A790 Good corrosion resistance, weldability General-purpose piping, food industry 316/316L A312/A790  Superior pitting resistance (Mo-added)   Marine, chemical processing 904L B677 High Ni & Cu for extreme corrosion Sulfuric & phosphoric acid plants Duplex 2205 A928 High strength, chloride resistance Offshore, seawater cooling systems Flange Connection Types: Butt-Weld Flanges (WN) – Welded to pipes for high-integrity joints. Socket-Weld Flanges (SW) – Used for small-diameter, high-pressure pipes. Slip-On Flanges (SO) – Easier alignment, suitable for low-pressure systems. Lap Joint Flanges (LJ) – Used with stub ends for easy disassembly. 2.  Stainless Steel Valves Flanges are commonly paired with stainless steel valves to control fluid flow.  The most widely used types include: A. Gate Valves Function: On/off flow control (not for throttling). Flange Types: RF (Raised Face), RTJ (Ring-Type Joint) for high pressure. Standards: API 600, ASME B16.34. B. Ball Valves Function: Quick shutoff, low-pressure drop. Flange Types: RF, FF (Flat Face) for low-pressure systems. Standards: API 6D, ASME B16.34. C. Check Valves Function: Prevent backflow. Flange Types: SW (Socket Weld) for compact systems, WN for large pipes. Standards: API 6D, ASME B16.34. D. Butterfly Valves Function: Throttling & shutoff in large pipes. Flange Types: Lug-type or wafer-style (for space-saving designs). Standards: API 609, AWWA C504. E. Globe & Control Valves Function: Precise flow regulation. Flange Types: RF, RTJ for high-pressure steam/gas. Standards: ANSI B16.10, ISA 75. 3.  Stainless Steel Fittings (Elbows, Tees, Reducers, Caps) Flanged connections often require stainless steel pipe fittings to change direction, split flows, or adjust pipe sizes. A. Elbows (90° & 45°) Function: Change flow direction. Flange Types: WN (Butt-Weld) for high-pressure systems. Standards: ASME B16.9, MSS SP-43. B. Tees (Equal & Reducing) Function: Split or combine flow. Flange Types: SO (Slip-On) for easy installation. Standards: ASME B16.9, MSS SP-75 (for high-yield strength). C. Reducers (Concentric & Eccentric) Function: Adjust pipe diameter. Flange Types: WN for high-pressure, SO for low-pressure. Standards: ASME B16.9, ANSI B16.11 (for threaded/socket-weld). D. Caps Function: Seal pipe ends. Flange Types: Blind flanges (for maintenance access). Standards: ASME B16.9, MSS SP-73. 4.  Stainless Steel Strainers & Filters Flanged strainers protect downstream equipment from debris. A. Y-Strainers Function: Remove particles from liquids/gases. Flange Types: RF, RTJ for high-pressure steam. Standards: ASME B16.34, API 598. B. Basket Strainers Function: High-capacity filtration. Flange Types: RF, FF for low-pressure water systems. Standards: MSS SP-71, ISO 5208. 5.  Stainless Steel Expansion Joints & Flexible Couplings Used to absorb thermal expansion, vibration, and misalignment. A. Bellows Expansion Joints Function: Compensate for pipe movement. Flange Types: WN for high-pressure steam. Standards: EJMA (Expansion Joint Manufacturers Association). B. Flexible Rubber/Pump Couplings Function: Reduce vibration in pumps/compressors. Flange Types: DIN or ANSI standard flanges. 6.  Specialty Flanged Components A. Sight Glasses & Flow Meters Function: Visual inspection/flow measurement. Flange Types: Hygienic clamp flanges (Tri-Clamp) in food/pharma. B. Heat Exchangers & Pressure Vessels Function: Heat transfer/storage. Flange Types: RTJ for high-pressure ASME vessels. Stainless steel flanges are essential for connecting ​​pipes, valves, strainers, and fittings​​ in demanding industries. The choice of flange type (WN, SO, SW, LJ) depends on ​​pressure, temperature, and corrosion requirements​​. Proper material selection (304, 316, duplex, nickel alloys) ensures long-term reliability in aggressive environments. For critical applications, always follow ​​ASME, API, and ISO standards​​ to ensure safe and leak-free performance.

The performance of flanges in high-temperature environments varies significantly depending on the material used, primarily in terms of strength retention, oxidation resistance, creep resistance, thermal stability, and compatibility with media.  Below is an analysis of typical material categories: ​​1.  Carbon Steel Flanges (e.g., Q235, 20# Steel) – Basic Choice for Low to Medium Temperatures​​​​Strength Degradation at High Temperatures​​Carbon steel flanges are typically limited to temperatures below ​​425°C​​.  Beyond ​​350°C​​, their yield strength drops significantly (e.g., 20# steel’s yield strength decreases from ​​245 MPa at room temperature to 180 MPa at 400°C​​).  Above ​​450°C​​, pearlite spheroidization occurs, leading to grain coarsening and eventual creep rupture.​​Poor Oxidation Resistance​​Rapid oxidation begins above ​​300°C​​, forming a loose ​​Fe₃O₄​​ layer.  At ​​500°C​​, the oxidation rate is ​​five times faster​​ than at 300°C.  Exposure to sulfur or water vapor further accelerates corrosion. ​​2.  Austenitic Stainless Steel Flanges (304/316, etc.) – Preferred for High-Temperature Corrosion Resistance​​​​Better High-Temperature Strength and Oxidation Resistance​​​​304 stainless steel​​ can withstand up to ​​870°C​​, while ​​316L (with molybdenum)​​ maintains good strength (yield strength ≥ ​​120 MPa​​) below ​​650°C​​.The ​​Cr₂O₃ oxide layer​​ (from 18-20% chromium) provides superior oxidation resistance (e.g., ​​90% lower oxidation rate than carbon steel at 800°C​​).​​High-Temperature Risks​​​​Sensitization (450-850°C):​​ Carbide precipitation may cause intergranular corrosion (mitigated by stabilization treatments, e.g., ​​321 stainless steel with titanium​​).​​Creep Limitations:​​ Above ​​650°C​​, creep deformation accelerates, requiring reduced allowable stress (e.g., ​​316L at 700°C has only 15% of its room-temperature strength​​). ​​3.  Duplex Steel Flanges (2205, 2507, etc.) – Cost-Effective for High-Temperature Corrosion​​​​Intermediate High-Temperature Performance​​​​2205 duplex steel​​ is usable up to ​​300°C​​, while ​​super duplex 2507​​ extends to ​​350°C​​ (yield strength > ​​400 MPa at 300°C​​, ​​twice that of 304 stainless steel​​).Beyond ​​350°C​​, ferrite phase degradation accelerates, reducing creep resistance faster than austenitic steels. ​​4.  Chromium-Molybdenum Steel Flanges (15CrMo, P91, etc.) – Ideal for High-Temperature, High-Pressure Conditions​​​​Enhanced Strength and Creep Resistance​​​​15CrMo (1-1.5% Cr, 0.5% Mo)​​ operates up to ​​550°C​​ (yield strength > ​​200 MPa at 500°C​​).​​P91 (9% Cr, 1% Mo)​​ withstands ​​650°C long-term​​, with ​​twice the creep rupture strength of 15CrMo​​ (e.g., ​​100 MPa vs. 40 MPa at 600°C for 100,000 hours​​). ​​5.  Nickel-Based Alloy Flanges (Inconel 625, Hastelloy C-276, etc.) – Ultimate Solution for Extreme Conditions​​​​Unmatched High-Temperature Performance​​​​Inconel 625​​ retains > ​​100 MPa tensile strength at 1093°C​​.​​Hastelloy C-276​​ resists oxidation up to ​​1200°C​​, with creep life exceeding ​​100,000 hours​​ (e.g., ​​5x stronger than 316L at 800°C​​).​​Resistance to Complex Corrosion​​High nickel (≥50%), chromium (20-30%), and molybdenum (10-16%) content enables resistance to:​​Oxidation, stress corrosion, and intergranular attack​​ in harsh environments (e.g., ​​650°C coal gasifiers with H₂S/CO₂​​).Suitable for ​​20+ years of service​​ in extreme conditions like high-temperature sulfuric acid or sulfur-rich oil/gas.

​​Six Longwan Enterprises Join Hands for a Successful Fun Sports Day​​​​—Yuhao Clinches Basketball Championship, Showcasing Team Spirit​​ To strengthen inter-enterprise collaboration and enhance employee cohesion, the "2023 Longwan Enterprise Joint Sports Day," co-organized by six renowned enterprises in the Longwan district, kicked off with great energy at Longwan on June X. The event, featuring an opening ceremony, fun competitions, a basketball tournament, and a closing ceremony, highlighted the camaraderie and competitive spirit among the participating companies. Among them, the Yuhao team stood out with an outstanding performance, securing the basketball championship and becoming the center of attention. ​​YUHAO – Excellence Through Strength​​As a leading industry player in Longwan, ​​Yuhao has always prioritized team building and employee development. This sports event was not just a competition but also an opportunity to strengthen partnerships and foster mutual growth. Moving forward, Yuhao​ will continue upholding its philosophy of "Pursuing Excellence, Achieving Win-Win Cooperation," working hand in hand with partners to create a brighter future! The success of this sports event has not only deepened inter-company relationships but also injected new vitality into Longwan’s collaborative development. Inspired by this championship, ​​Yuhao will continue striving for excellence in its industry!

Wenzhon, June, 2025– A thrilling basketball tournament recently took place at [venue name or description], bringing together teams from Yuhao and several partner companies for a day of spirited competition and camaraderie.  The event, held in a bright and energetic indoor court, showcased teamwork, sportsmanship, and friendly rivalry among participants. The tournament featured intense games between teams donning black and red jerseys, with players displaying impressive skills and determination.  Key moments included a clutch jump shot by player No. 20 and tight defensive plays by competitors like No. 19 and No. 24.  The scoreboard reflected the competitive spirit, with one match ending at a dynamic 46-23. The tournament wasn’t just about scores—it was a celebration of relationships.  Spectators cheered from the sidelines as players from Intelhansa, Outong Group, and other partners forged connections on the court.  The blend of natural light from the gymnasium’s large windows and the polished hardwood floor created an ideal setting for both competition and networking.

​​June 10, 2025​​ — The Sales Department celebrated outstanding achievements at its June Monthly Awards Ceremony,  honoring top performers who demonstrated exceptional dedication and results "Success stems from bold actions and relentless focus on customer needs"."Every team member’s growth fuels our collective success". The ceremony concluded with a call to action for all employees to embrace the momentum, aiming for even greater milestones in July.   The company remains committed to fostering talent and celebrating achievements that drive shared success. Congratulations to all awardees! ​​ Let’s continue to strive for excellence together.

The journey of partnership between Yuhao Stainless Steel Company and a prominent Turkish firm is a testament to resilience, quality, and mutual trust. Initially, the relationship was established through an international trade exhibition where representatives from both companies engaged in discussions about potential collaborations. The path wasn't without challenges. Language barriers, cultural differences, and varying business practices initially posed significant hurdles. However, Yuhao Stainless Steel demonstrated unwavering commitment by providing detailed product specifications, organizing virtual factory tours, and ensuring transparent communication at every stage. Despite these obstacles, what truly solidified this partnership was Yuhao's unwavering dedication to quality and efficiency. The first order placed by the Turkish company exceeded their expectations not only in terms of the superior quality of stainless steel products but also due to remarkably swift delivery times. This reliability led to multiple repeat purchases over time, strengthening their bond further. This successful collaboration exemplifies how overcoming initial difficulties can lead to long-lasting, profitable relationships built on trust, high standards, and timely service. It highlights Yuhao Stainless Steel's capability as a global supplier capable of meeting diverse international demands while maintaining excellence across all operations. This story serves as an inspiring example within the business community showcasing that perseverance coupled with top-notch offerings results in fruitful partnerships transcending geographical boundaries.We are Yuhao Stainless Steel Company, our stainless steel seamless pipe, flange, pipe fittings, valves are worthy of customer trust.      

At the recent Shanghai Trade Exhibition, Yuhao Stainless Steel Company showcased its commitment to excellence and innovation in stainless steel products. This prestigious event served as a vital platform for international trade, bringing together suppliers, distributors, and buyers from across the globe. Yuhao's participation was marked by significant success as numerous potential partners expressed keen interest in their high-quality samples. Yuhao's exhibition booth attracted a steady stream of visitors eager to explore their extensive range of stainless steel offerings. Engaging in constructive dialogues with these prospects proved invaluable for fostering new business relationships. Many suppliers were particularly impressed by the superior quality demonstrated through detailed product presentations and hands-on sample inspections. Notably, the interaction extended beyond mere discussions; several clients placed orders on-site after witnessing firsthand the exceptional craftsmanship and reliability that Yuhao represents. These immediate transactions underscored not only the appeal but also the trustworthiness inherent in Yuhao’s brand promise. This experience highlighted how face-to-face communication at such exhibitions can significantly enhance mutual understanding among international traders leading towards more fruitful collaborations. It reaffirms Yuhao Stainless Steel Company's position as a leading player within the global marketplace while reinforcing commitments towards delivering top-tier solutions tailored specifically for diverse customer needs worldwide. We are Yuhao Stainless Steel Company, our stainless steel seamless pipe, flange, pipe fittings, valves are worthy of customer trust.Through continued efforts like these exhibited events, Yuhao remains steadfast in promoting international commerce alongside building lasting partnerships built upon shared successes achieved together through open dialogue and transparent dealings practices.