Steel Flat Flange

Longan is an experienced China factory, manufacturer, and global supplier of Steel Flat Flange, serving international buyers for many years. From raw material selection to final inspection, our in-house factory follows strict quality management systems to ensure consistent quality and long-term reliability. We support custom specifications, private labeling, and bulk production, helping buyers reduce sourcing risks and total costs. Send us your requirements now and receive free samples and expert advice from our manufacturing team.

Exclusive technology

1. Cost advantage over the entire life cycle

Cost item Traditional forged steel flange Steel Flat Flange Pro Savings ratio

30-year total cost of ownership $18,500 $6,200 ↓66%

Single replacement time 8 hours 2.5 hours ↓69%

Annual maintenance frequency 3.2 times/year 0.7 times/year ↓78%

2. Breakthrough in ultimate pressure bearing performance

Parameter National standard flange Steel Flat Flange Pro Exceeding range

Cyclic fatigue life 5,000 times @25MPa 20,000 times @35MPa 300%

Axial deformation (35MPa) 1.8mm 0.6mm ↓67%

Burst pressure (DN300) ≤15MPa 42MPa 180%

Core technology: Built-in titanium alloy reinforcement ring in flange neck, yield strength up to 1,250MPa

3. Ability to resist non-uniform loads

In Under the condition of 15° pipeline misalignment, the traditional flange in the eccentric load test is greater than 10⁻³, while the sealing leakage rate remains ≤10⁻⁵ mbar·L/s

Structural innovation: The radial reinforcement rib design on the back of Steel Flat Flange reduces local stress concentration by 48%

Vibration suppression: Amplitude attenuation rate 92% (ISO 10816-3 standard, frequency band 50-200Hz)

Solve the bolt relaxation caused by high-pressure pulsation

Intelligent wear warning: The sealing surface is embedded with a nano-zirconia wear indicator layer, and the color change prompt can be seen by the naked eye when the thickness is less than 0.1mm

Preload locking technology: Using a double-conical bolt hole, the preload of the traditional structure is attenuated by ≥20% under a pressure fluctuation of 35MPa, while the Steel Flat Flange is attenuated by ≤5%

Adaptability to extreme environments

Environment Performance Test standard

Low-temperature impact (-70℃) Charpy impact energy 89J (national standard ≥34J) GB/T 229-2020

Deep sea corrosion (5,000m) 30-year equivalent corrosion rate 0.03mm/year ASTM G111-97

Sand and dust wear (120m/s) Sealing surface damage depth ≤8μm (10,000h) ISO 5890:2012