304 Stainless Steel Seamless Pipe

The 304 Stainless Steel Seamless Pipe is one of the most commonly used types of stainless steel pipes due to its high resistance to corrosion, strength, and excellent durability. Made from high-quality 304 stainless steel, these seamless pipes are ideal for a variety of industrial applications, including plumbing, structural support, and chemical processing. Known for their smooth internal and external surface, 304 stainless steel seamless pipes are highly reliable and versatile, offering long-lasting performance even in extreme conditions.

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Product Introduction

304 stainless steel seamless pipe is engineered for industries requiring flawless structural integrity in high-pressure, high-temperature, or corrosive environments. Manufactured through hot extrusion or cold drawing, it eliminates weld seams, delivering uniform strength and superior resistance to stress corrosion cracking (SCC). Ideal for oil and gas, petrochemical, and power generation systems, this pipe meets ASTM A312 and ASME SA-312 standards while offering a 25% lifespan advantage over welded alternatives in cyclic loading conditions.

Global Standards & Grades

Region	Standard	Grade
USA	ASTM A312/ASME SA-312	UNS S30400
Europe	EN 10216-5	1.4301
Japan	JIS G3459	SUS304 TB
China	GB/T 14976	06Cr19Ni10

Chemical Composition (Weight %)

Cr	Ni	C	Mn	Si	P	S	Fe
18–20%	8–10.5%	≤0.08%	≤2.0%	≤0.75%	≤0.045%	≤0.03%	Balance

Key Differentiators

Seamless Superiority:

Zero weak points from welding, ensuring 100% NDT (non-destructive testing) compliance per ASTM E213.

Withstands internal pressures up to 35 MPa (Schedule 160 pipes).

Thermal Stability:

Operates continuously at 600°C (1.112°F) with minimal scaling; intermittent use up to 870°C.

Corrosion Resistance:

PREN (Pitting Resistance) of 18–20; handles chlorides ≤100 ppm and sulfuric acid ≤10% concentration.

Surface Quality:

ID/OD finishes: Pickled (Ra ≤3.2 µm), polished (Ra ≤0.8 µm), or sandblasted for enhanced adhesion.

Mechanical Properties

Condition	Tensile Strength	Yield Strength	Elongation	Hardness (HRB)
Hot-Finished	515–720 MPa	205 MPa (min)	40% (min)	85–95
Cold-Drawn	860–1.100 MPa	550 MPa (min)	12% (min)	≤95

Industry Applications

Oil & Gas: Subsea umbilicals, hydraulic fracturing manifolds, LNG heat exchangers.

Power Generation: Superheated steam lines, nuclear reactor auxiliary cooling systems.

Chemical Processing: High-pressure acid leaching (HPAL) autoclaves, ammonia synthesis loops.

Aerospace: Hydraulic fluid conduits, fuel injection lines, cryogenic storage.

Pharma: Sterile API transfer lines, clean steam distribution, CIP/SIP-compatible networks.

Fabrication & Testing

Production Methods:

Hot extrusion: For large diameters (OD 100–600 mm).

Cold drawing: Precision sizing for OD 6–120 mm with ±0.1 mm tolerance.

Quality Assurance:

100% ultrasonic testing (UT) for wall integrity.

Hydrostatic testing at 1.5x design pressure (ASME B31.3 compliant).

Frequently Asked Questions

Q1: Why choose seamless over welded 304 pipes?

A1: Seamless pipes eliminate weld defects, offering superior fatigue resistance for cyclic pressure/vibration environments (e.g., ASME B31.1 Power Piping).

Q2: Can seamless 304 pipes handle sour service (H₂S environments)?

A2: Limited to mild sour conditions (NACE MR0175 Group I). For severe H₂S, specify 316L or duplex 2205.

Q3: What end finishes are available?

A3: Options include plain, beveled (ASME B16.25), threaded (NPT, BSP), or grooved (Victaulic-style).

Q4: How to prevent intergranular corrosion in sensitized zones?

A4: Post-fabrication solution annealing at 1.040–1.120°C followed by rapid quenching.

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