317L Stainless Steel Pipe Fittings for High-Pitting Resistance and Chemical Service

Superior Pitting Resistance: Molybdenum content (3.0-4.0%) gives PRE of 28-32, outperforming 316L in chloride media.

Excellent Crevice Corrosion Resistance: Ideal for seawater piping, acetic acid, and other aggressive organics.

Low Carbon Content (≤0.03%): Prevents intergranular corrosion after welding – 317L fittings are ready for field welding.

Full Range: Butt-weld (ASME B16.9), socket-weld and threaded (ASME B16.11) in 317L.

International Certifications: ABS, BV, DNV, LR, GL, RINA, CCS, KR, NK, NORSOK.

Heat Treatment: Solution annealed at 1040–1100°C followed by water quenching.

Raw 317L billets from certified mills.

Hot piercing and rolling.

Cold drawing / pilgering to precise dimensions.

Solution annealing + water quench.

Beveling (butt-weld) or threading (NPT) / socket boring.

Pickling & passivation.

100% PMI (Positive Material Identification) and PT inspection.

Annealed & Pickled (AP)

Mechanically Polished (180#–400#)

Mirror Polished (8K)

Electropolished

Passivated

PMI (spectrometer) for alloy verification.

Tensile, yield, elongation, hardness (ASTM A370).

100% Penetrant Testing (PT) for surface defects.

Intergranular Corrosion Test (ASTM A262 Practice E).

Dimensional checking with go/no-go gauges.

Optional UT/RT, hydrostatic test.

Chemical Processing: Acetic acid, formic acid, phosphoric acid service.

Pulp & Paper: Bleach plant pipes (chlorine dioxide, hypochlorite).

Wastewater Treatment: High-chloride effluent lines.

Textile Dyeing: Hot dye bath circulation.

Power Generation: Condenser tubes (high-chloride cooling water).

Packaging, Shipping, and Logistics

Small sizes: cartons with moisture-proof lining.

Large sizes: wooden crates / steel frames with plastic end caps.

Threaded fittings: thread protectors included.

Ready stock: 1/2″–12″ Sch10S/Sch40S – dispatch within 48 hours.

Full shipping documentation: MTR, COO, packing list.

1. What is the advantage of 317L over 316L?
Higher molybdenum (3-4%) gives better pitting resistance in chlorides, organic acids, and bleaching solutions.

2. Are 317L fittings suitable for seawater?
Yes, for moderate-velocity seawater; for high-velocity or stagnant seawater, consider duplex or super duplex.

3. Can you supply 317L fittings with NACE MR0175?
317L is not typically NACE certified; for sour service use duplex or Alloy 825.

True high-molybdenum 317L, fully traceable.

Large stock of seamless fittings 1/2″–16″.

Competitive pricing compared to European mills.

Short lead time for non-stock sizes.

Victor: +86 15575100681, Jack: +86 18390957568
E-mail: info@womicstainless.com | www.womicsteel.com

Stock Examples: 

317L 90° LR Elbow 2″ Sch40S, 317L Equal Tee 4″×4″ Sch10S, 317L Concentric Reducer 6″×4″ Sch40S, 317L Pipe Cap 8″ Sch40S.

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