Corrosion Resistant Stainless Steel Flange Rings (Cl⁻ Resistance) 316L Stainless Steel Custom Anti Pitting Design

1,Product Overview

Our 316L Stainless Steel Flange Rings are engineered for extreme environments where chloride-induced corrosionand pitting resistance are critical.

2,Features & Specifications

1. Advanced Material Properties

Material: 316L Stainless Steel (Low Carbon, High Molybdenum Content)

Composition: Cr 16-18%, Ni 10-14%, Mo 2-3%, C ≤0.03%

Corrosion Resistance:

Chloride Resistance: Withstands >1,000 ppm Cl⁻ (ASTM G48 Method A Testing).

Pitting Resistance Equivalent (PRE): ≥35 (Calculated as %Cr + 3.3×%Mo + 16×%N).

Mechanical Properties:

Tensile Strength: ≥485 MPa | Yield Strength: ≥170 MPa | Hardness: ≤217 HB.

Certifications: ASTM A240, NACE MR0175, PED 2014/68/EU.

2. Precision Engineering

Design Flexibility: Customizable bolt patterns, facings (RF/FF/RTJ), and non-circular profiles.

Dimensional Accuracy:

Bolt Hole Positioning: ±0.3mm | Outer Diameter: ±1.0mm.

Surface Treatment:

Electro-polishing (Ra ≤0.4μm) or Passivation (ASTM A967) for enhanced corrosion barrier.

Pressure Rating: Class 150 to Class 2500 (ASME B16.5/EN 1092-1).

3. Technical Specifications

Size Range: 1/2" to 36" nominal bore (Custom sizes available).

Temperature Range: -196°C to 800°C (Cryogenic to high-temperature compatible).

Interoperability: Compatible with ASTM A182 F316L forgings for welded assemblies.

3,Advantages

✅ Chloride Resistance

316L’s molybdenum-enriched matrix prevents pitting and crevice corrosion in seawater, brine injectors, and acidic media.

✅ Zero Post-Weld Degradation

Low carbon content (<0.03%) eliminates carbide precipitation during welding, ensuring intergranular corrosion resistance.

✅ Hybrid Manufacturing

Cold Forming/Welding: Retain material integrity without thermal distortion.

5-Axis CNC Machining: Achieve complex geometries and tight tolerances.

✅ Full Traceability

Mill Test Reports (MTRs) with heat number tracking.

100% PT (Dye Penetrant) and PMI (Positive Material Identification) testing.

4,Applications

Offshore & Marine: Subsea pipelines, seawater cooling systems, shipboard fittings.

Chemical Processing: Chlor-alkali reactors, acid storage tanks, bleach production.

Desalination Plants: Reverse osmosis (RO) modules, brine discharge flanges.

Pharmaceutical: CIP/SIP systems, high-purity fluid transfer.

Oil & Gas: H₂S/CO₂-laden wellheads, LNG cryogenic piping.

5,Manufacturing Process

1. Material Selection:316L steel sourced from ISO-certified mills

2. Forming:Cold rolling/pressing or TIG welding (for large sizes).

3. Machining:5-axis CNC for bolt holes, grooves, and sealing faces. ±0.3mm positional accuracy.

4. Surface Treatment:Electro-polishing or nitric acid passivation.

5. Quality Control:PMI, PT/UT testing, 3D CMM for dimensional verification.