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Xiamen Stainless Steel Flange
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Name: Xiamen Stainless Steel Flange
Material: Stainless Steel
Standard: ANSI B16.5
Size: 1/2 to 24 Inch
Pressure: 150LB to 2500LB
Process Method: Forged
Type: SO/ WN/ BL
Usage: Used in the Fields of Construction, Chemical Engineering, Petroleum and Natural Gas.
Material: Stainless Steel
Standard: ANSI B16.5
Size: 1/2 to 24 Inch
Pressure: 150LB to 2500LB
Process Method: Forged
Type: SO/ WN/ BL
Usage: Used in the Fields of Construction, Chemical Engineering, Petroleum and Natural Gas.
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Stainless Steel Flange is manufactured from high-quality stainless steel in compliance with ANSI B16.5 standards, covering sizes from ½"to 24"and pressure ratings from 150LB to 2500LB to meet high-strength demands. Fabricated through forging processes, Stainless Steel Flange offers multiple types including SO (Slip-On), WN (Weld Neck), and BL (Blind), ensuring versatile adaptation to various piping systems. Widely applied in construction, chemical, petroleum, and natural gas industries, it delivers exceptional corrosion resistance, sealing performance, and long service life.
High-Temperature & Corrosion Resistance Performance
1. High-Temperature Performance of 304 (-196°C to 800°C)
304 stainless steel (06Cr19Ni10), with its stable austenitic structure, is the ideal choice for Stainless Steel Flange in wide temperature ranges:
- Cryogenic Performance (-196°C):
The Stainless Steel Flange retains excellent toughness in deep cryogenic environments, with its face-centered cubic (FCC) structure preventing brittle fracture in liquid nitrogen applications. ASTM A240 tests confirm an impact energy of ≥100J at -196°C, making it fully suitable for LNG pipelines.
1. High-Temperature Performance of 304 (-196°C to 800°C)
304 stainless steel (06Cr19Ni10), with its stable austenitic structure, is the ideal choice for Stainless Steel Flange in wide temperature ranges:
- Cryogenic Performance (-196°C):
The Stainless Steel Flange retains excellent toughness in deep cryogenic environments, with its face-centered cubic (FCC) structure preventing brittle fracture in liquid nitrogen applications. ASTM A240 tests confirm an impact energy of ≥100J at -196°C, making it fully suitable for LNG pipelines.
- High-Temperature Performance (800°C):
In oxidative environments, Stainless Steel Flange forms a dense Cr₂O₃ oxide layer (2–3 μm) with the following measured data:
- Tensile strength at 650°C: ≥350 MPa (70% of room temperature strength)
- Oxidation rate at 800°C: ≤0.1 mm/year (ASTM G54)
Note: Avoid sensitization range (450–850°C) to prevent intergranular corrosion.
In oxidative environments, Stainless Steel Flange forms a dense Cr₂O₃ oxide layer (2–3 μm) with the following measured data:
- Tensile strength at 650°C: ≥350 MPa (70% of room temperature strength)
- Oxidation rate at 800°C: ≤0.1 mm/year (ASTM G54)
Note: Avoid sensitization range (450–850°C) to prevent intergranular corrosion.
2. Chloride Resistance of 316L
316L (022Cr17Ni12Mo2), with 2–3% molybdenum addition, significantly enhances Stainless Steel Flange performance in chloride (Cl⁻) environments:
- Critical Pitting Temperature (CPT) ≥25°C:
- In 3.5% NaCl solution, 316L shows no pitting at 25°C (while 304 may corrode).
- In 6% FeCl₃ solution, corrosion rate <0.1 mm/year (versus 1 mm/year for 304).
316L (022Cr17Ni12Mo2), with 2–3% molybdenum addition, significantly enhances Stainless Steel Flange performance in chloride (Cl⁻) environments:
- Critical Pitting Temperature (CPT) ≥25°C:
- In 3.5% NaCl solution, 316L shows no pitting at 25°C (while 304 may corrode).
- In 6% FeCl₃ solution, corrosion rate <0.1 mm/year (versus 1 mm/year for 304).
- Stress Corrosion Cracking (SCC) Resistance:
In environments with Cl⁻ ≤10,000 ppm and ≤60°C (e.g., coastal power plants), 316L Stainless Steel Flange exhibits near-zero SCC (validated by NACE TM0177).
In environments with Cl⁻ ≤10,000 ppm and ≤60°C (e.g., coastal power plants), 316L Stainless Steel Flange exhibits near-zero SCC (validated by NACE TM0177).
- Molybdenum Enhancement Mechanism:
Mo improves the passive film's resistance to Cl⁻ penetration, lowering the repassivation potential by 200–300 mV compared to 304.
Mo improves the passive film's resistance to Cl⁻ penetration, lowering the repassivation potential by 200–300 mV compared to 304.
Stainless Steel Flange Selection Guide
| Type | Application | Advantages |
| 304 | High-temperature steam pipes (≤800°C), liquid oxygen tanks | Cost-effective, excellent thermal stability |
| 316L | Seawater desalination, hydrochloric acid pipelines | 3–5x longer lifespan in Cl⁻ environments |
Case Study:
In a refinery pipeline with H₂S + Cl⁻, 304 Stainless Steel Flange developed pitting after 2 years, while replacement with 316L Stainless Steel Flange achieved 5 years of stable operation (UT-measured wall loss <0.05 mm).
In a refinery pipeline with H₂S + Cl⁻, 304 Stainless Steel Flange developed pitting after 2 years, while replacement with 316L Stainless Steel Flange achieved 5 years of stable operation (UT-measured wall loss <0.05 mm).
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