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304/304L Austenitic Stainless Steel Pipe Fittings for General Industrial and Sanitary Applications

Tags : Stainless Steel Plates , 310S welded pipe , Finned Tubes

High-Performance 304/304L Stainless Steel Pipe Fittings for Food Processing, Water Treatment, and Architectural Systems

Womic Steel manufactures premium 304/304L Austenitic Stainless Steel Pipe Fittings, covering a full range of products including elbows, tees, crosses, concentric/eccentric reducers, caps, stub ends (lap joint), and nipples. Our fittings provide excellent corrosion resistance in mild environments, outstanding formability, and precise dimensional accuracy. They are the ideal choice for general industrial piping, food and beverage processing, pharmaceutical equipment, water treatment plants, HVAC systems, and architectural handrails.

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Key Features of 304/304L Stainless Steel Pipe Fittings

Corrosion Resistance: Excellent resistance to oxidation and corrosion in fresh water, mild chemical media, and atmospheric conditions.

Weldability and Formability: The low carbon content of 304L prevents intergranular corrosion after welding; fittings are available in butt-weld (BW), socket-weld (SW), and threaded (NPT) connections.

Full Range of Types: Elbows (45°/90°/180°), tees (equal/reducing), reducers (concentric/eccentric), caps, stub ends, crosses, and nipples.

Mechanical Strength: Good tensile and yield strength combined with excellent ductility, suitable for moderate-pressure pipelines and structural applications.

International Certifications: Fittings can be certified by ABS, BV, DNV, LR, GL, RINA, CCS, KR, and NK, and comply with NORSOK standards for offshore projects.

International Standards and Corresponding Grades for Stainless Steel Fittings

Standard	Application Scope	Corresponding 304/304L Grade
ASME B16.9	Industrial butt-welding fittings (BW)	WP304 / WP304L
ASME B16.11	Socket-welding and threaded fittings (SW / NPT)	304 / 304L
MSS SP-43	Light-wall butt-welding fittings (for ASME B36.19 wall thickness)	WP304 / WP304L
EN 10253-2 (Type B)	European standard butt-welding fittings	1.4301 / 1.4307
EN 10253-4	European standard socket-welding fittings	X2CrNi18-9
JIS B2311 / B2312	Japanese industrial standard steel pipe fittings	SUS304 / SUS304L
GB/T 12459	Chinese national standard seamless/welded fittings	06Cr19Ni10 / 022Cr19Ni10
GB/T 14383	Chinese standard socket-welding/threaded fittings	06Cr19Ni10 / 022Cr19Ni10

Chemical Composition of 304 and 304L Stainless Steel Fittings

Element	C	Mn	P	S	Si	Cr	Ni
304 Fittings	≤0.08	≤2.00	≤0.045	≤0.03	≤1.00	18.0–20.0	8.0–11.0
304L Fittings	≤0.03	≤2.00	≤0.045	≤0.03	≤1.00	18.0–20.0	8.0–12.0

The lower carbon content in 304L minimizes carbide precipitation during welding, providing enhanced resistance to intergranular corrosion compared to standard 304, especially in welded service environments.

Mechanical Properties and Heat Treatment Requirements

Property	Unit	304	304L
Tensile Strength	MPa	≥515	≥485
Yield Strength (0.2% offset)	MPa	≥205	≥170
Elongation	%	≥35	≥35
Hardness (Brinell)	HBW	≤201	≤201
Hardness (Rockwell B)	HRB	≤90	≤90
Density	g/cm³	7.93	7.93
Melting Range	°C	1400–1450	1400–1450

Heat Treatment Condition: All fittings are solution annealed at 1010–1080°C followed by rapid cooling (water quenching). This treatment restores full corrosion resistance, relieves internal stresses, and enhances ductility.

Pressure-Temperature Ratings for 304/304L Fittings (per ASME B16.11)

Class	Pressure Rating (psig) @ 100°F	Pressure Rating (psig) @ 500°F	Pressure Rating (psig) @ 750°F
2000 LB	1390	1115	930
3000 LB	2085	1670	1390
6000 LB	4170	3340	2785

Types and Production Range of Pipe Fittings from Womic Steel

Fitting Type	Main Forms	Manufacturing Method
Elbow	45°, 90°, 180° (LR / SR)	Seamless / Welded
Tee	Equal, Reducing	Seamless / Welded
Cross	Equal, Reducing	Welded
Reducer	Concentric, Eccentric	Seamless / Welded
Cap	Flat, Elliptical	Seamless / Stamped
Stub End	Long type, Short type	Seamless / Welded
Nipple	Threaded one/both ends, Full thread	Machined

Dimensions and Manufacturing Range

Parameter	Butt-Weld Fittings (BW)	Socket-Weld / Threaded Fittings (SW / NPT)
Nominal Size (DN/NPS)	1/2″ – 48″ (DN15 – DN1200)	1/8″ – 4″ (DN6 – DN100)
Wall Thickness Schedule	Sch5S, Sch10S, Sch20S, Sch40S, Sch80S, Sch160, XXS	2000LB, 3000LB, 6000LB
Manufacturing Process	Seamless (≤24″) / Welded plate (>24″)	Forging + Machining

Manufacturing Process (Seamless Butt-Weld Fittings)

Cutting & Heating: Cut to exact volume and induction-heated.

Forming: Hot extruded using hydraulic presses or mandrel push machines.

Shaping & Sizing: Calibrated in dies to ensure accurate angle, radius, and uniform wall thickness.

Solution Annealing: 1010–1080°C followed by water quenching.

End Finishing: Beveling (butt-weld) or threading / socket boring (SW/threaded).

Pickling & Passivation: Removes oxide scale and creates passive film.

Marking & Inspection: Laser/inkjet marked with grade, heat number, size.

Surface Finishes and Special Treatment Options

Surface Finish	Description
Annealed & Pickled (AP)	Bright silver appearance – standard for industrial piping.
Mechanically Polished	Smooth finish (180#–400# grit) for general and architectural use.
Mirror Polished (8K)	Ultra-reflective, ideal for sanitary and food applications.
Brushed / Hairline	Satin linear texture for handrails and decorative systems.
Electropolished	Extremely clean, smooth, and hygienic.
Passivated	Chemically treated to enhance passive oxide layer.

Quality Control and Inspection

Chemical Analysis: PMI 100% verification.

Mechanical Testing: Tensile, yield, elongation, hardness.

Dimensional Inspection: Go/no-go gauges, CMM.

NDT: 100% Penetrant Testing (PT); UT/RT upon request.

Hydrostatic / Pneumatic Testing per customer specification.

Intergranular Corrosion Test: ASTM A262 Practice E.

Third-Party Inspection: SGS, BV, TUV available.

Dimensional Tolerances (ASME B16.9 / B16.11)

Parameter	Size Range	Permitted Tolerance
Elbow Angle	All sizes	±0.5°
End Outside Diameter	≤4″ / ≤8″ / >8″	±1.6 mm / ±2.4 mm / ±3.2 mm
Wall Thickness	All	Not less than 87.5% of nominal
Thread (NPT)	All	Per ANSI B1.20.1

Applications of 304/304L Stainless Steel Pipe Fittings

Food & Beverage: Sanitary pipelines, dairy processing, brewing systems.

Water Treatment: Reverse osmosis, high-purity water distribution.

Pharmaceutical Equipment: Clean piping for drug manufacturing.

Construction & Decoration: Handrails, structural supports, architectural piping.

General Industrial: Low-pressure air, water, and steam lines.

Packaging, Shipping, and Logistics Advantage

Small bore fittings (≤2″): Cartons or woven bags with moisture-proof film.

Large bore fittings (≥2.5″): Wooden pallets + stretch film, or steel crates.

End Protection: Plastic caps for butt-weld ends; thread protectors for threaded ends.

Ready Stock: Over 5,000 tons – dispatch within 24 hours.

Direct Shipping Cooperation: Competitive freight rates.

Professional Loading: In-house teams prevent damage

Frequently Asked Questions (FAQ)

1. What is the difference between 304 and 304L fittings?
304L has lower carbon (≤0.03%), preventing carbide precipitation during welding. For welded applications, 304L is preferred.

2. Can you provide fittings with special bevels?
Yes. Full customization – special bevel angles, short/long patterns, custom wall thicknesses.

3. Do you provide material test reports (MTR)?
Yes. EN 10204 3.1 MTR included. Third-party inspection available.

4. What is the typical lead time?
Stock sizes: 1–3 days. Custom sizes: 2–4 weeks.

5. Are these fittings suitable for marine applications?
For mild seawater exposure, 304 can be used; for severe marine environments, we recommend 316L.