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Location: HOME > PRODUCTS > Stainless Steel > Stainless Steel Pipe > 304/304L General-purpose Stainless Steel Pipe

304/304L General-purpose Stainless Steel Pipe

Buy TP304 & TP304L stainless steel pipe, seamless & welded round tube, good corrosion resistance, suitable for food, pharmaceutical, chemical, water treatment, heat exchanger. Mill Test Certificate supplied.

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4 and 304L (UNS S30400 / S30403, EN 1.4301 / 1.4307, TP304 / TP304L) are classic 18-8 chromium-nickel austenitic stainless steel pipes, the most widely used stainless steel tubing for fluid transmission and structural piping globally.

304 is the standard carbon grade; 304L is low-carbon variant. The low carbon content of 304L restricts chromium carbide precipitation during welding, effectively preventing intergranular corrosion at weld seams, which is ideal for heavy welded piping systems.

This stainless steel pipe delivers reliable general corrosion resistance in atmospheric, freshwater and mild chemical environments. It features excellent ductility, outstanding weldability and good low-temperature performance. It is non-magnetic under annealed condition.

Product Name		Stainless steel tube/pipe
Outer diameter	Round Tube	Φ9.5, Φ12.7, Φ16, Φ19, Φ22, Φ25, Φ32, Φ38, Φ51, Φ63, Φ76, Φ89, Φ102mm
	Square Tube	Sizes: 10×10, 15×15, 19×19, 25×25, 30×30, 38×38, 50×50, 60×60, 76×76, 100×100mm
	Rectangular Tube	Sizes: 10×20, 15×25, 25×38, 25×50, 30×60, 45×75, 50×100mm, etc.
Wall Thickness	Ultra-thin wall	≤2.0mm, instrument tubes, precision heat exchangers, thin-walled welded pipes
	Conventional thin-wall	2.0～6.0mm, general fluids, household decoration, municipal pipelines
	Thick-walled	6.0～10.0mm, industrial pressure pipelines, heat exchanger main pipelines
	Ultra-thick wall	>10.0mm, high-pressure boilers, petrochemical reactors, pipes for mechanical forgings
Length		Standard: 6 meters in fixed length (most suitable for container shipment) Customizable: 2.4 meters, 3 meters, 4 meters, 5.8 meters, etc.
Standard		ASTM, AISI, JIS, GB, DIN, EN, etc.
Surface		Black, Bright Polished, Rough Turning, Matt Surface Treatment, No. 4. BA, etc.
Scope of Application		Common applications for stainless steel pipes include food processing,Textile operations, Breweries, Water treatment plants, Oil and gas processing,Fertilizers and pesticides, Chemical applications,Construction, Pharmaceuticals, Auto parts, etc.
Certificate		ISO, SGS, BV, etc.
Production Technology		Hot Rolling, Cold Rolling
Edge Processing		Edging, Trimming

We supply seamless stainless steel pipe and welded stainless steel pipe. Round pipe is our main supply, also available square & rectangular tubes. Surface options: pickled, bright annealed, BA, polished. OD, wall thickness and length can be customized, schedule 10 / 40 / 80 available. All goods comply with ASTM A312, GB, EN, JIS standards. Mill Test Certificate (MTC) is provided for every batch. Large stock on hand, cutting & machining service supported for fast shipment.

Typical chemical composition (wt%)

Brand	C≤	Cr	Ni	Mn≤	Si≤	P≤	S≤
304	0.08	18.0~20.0	8.0~12.0	2.0	1.0	0.045	0.03
304L	0.03	18.0~20.0	8.0~12.0	2.0	1.0	0.045	0.03

Performance data of various grades of metal (for reference only) :

Mechanical Properties	Tensile Strength Kb (MPa)	Yield Strength σ0.2 (MPa)	Elongation D5 (%)	Hardness
304	≥ 520	≥ 205	≥ 40	≤ 187HB ;≤ 90HRB;≤ 200HV
304L	≥ 520	≥ 205	≥ 40	≤ 187HB ;≤ 90HRB;≤ 200HV

Core Performance (Comparison of 304/304L)

Corrosion Resistance: General austenitic, resistant to atmospheric/weak acid/weak alkali; 304L has stronger resistance to intergranular corrosion (no heat treatment required after welding)

Weldability: 304L is low carbon, less prone to sensitization and cracking in the weld heat-affected zone, suitable for chemical/pressure vessels/pipelines

Formability: Elongation ≥40%, easy to bend/stamp/roll, suitable for deep processing

Hygiene: Complies with FDA 21 CFR 177, EU 1935/2004, suitable for food/pharmaceutical applications

Temperature: -196℃~800℃, resistant to low temperatures/heat

Key Features

- Grade: TP304 (S30400, 1.4301) / TP304L (S30403, 1.4307) austenitic stainless steel pipe

- 304L low-carbon design, anti-intergranular corrosion after welding

- Good rust & mild corrosion resistance, excellent weldability & toughness

- Seamless / welded type, round / square / rectangular tube

- Multiple surface, various schedule, custom size & cutting service

- Strict inspection, full traceability with MTC certificate

- Ready stock, fast delivery for industrial piping projects

Main Applications

Food & beverage, sanitary pharmaceutical piping

Chemical pipelines, heat exchangers, reaction equipment

Water treatment, drinking water & purified water systems

Construction piping, architectural structural tubes

Machinery, instrument tubing, industrial fluid delivery

General pressure piping, boiler auxiliary piping

Surface: Hairline, 6K/8K mirror finish, Matte, Sandblasted

Export packaging & documents

Plastic cap for the tube opening + single tube protective film / bubble wrap, bundled with steel straps, IPPC fumigation wooden rack

Available: MTC material certificate, CO/FormE origin certificate, third-party testing by SGS/BV, invoice and packing list box

Payment Methods

Flexible payment terms available: T/T and L/C. For new clients, 30% advance payment for production, balance against copy of B/L. L/C is acceptable for large & regular orders to secure both parties.

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Warehousing Management

Before each batch of steel leaves the factory, a complete process inspection is strictly carried out. From chemical composition, mechanical properties to dimensional tolerance and surface quality, each item is carefully checked to ensure compliance with national standards and export regulations. At the same time, the quantity, packaging and rust prevention treatment are also verified. An original factory warranty certificate is attached, guaranteeing the quality. Before shipment, inspection photos are provided. Any non-compliant items will not be released, and the quality is fully controllable throughout the process. This ensures your overseas purchasing is safe and worry-free.

All items are visually inspected before delivery. No cracks, deformation, rust, scratches or cutting marks are allowed; edges must be smooth. Only visually sound products will be shipped.

Thickness, width, length, wall thickness, outer diameter have been measured. Straightness, curvature, torsion, diagonal tolerance all meet the corresponding tolerance requirements.

Quality inspection includes: mechanical property tests (yield strength, tensile strength), elongation rate, impact energy, hardness testing, chemical composition testing, process performance testing, etc.

Inspection according to packaging requirements: secure binding, moisture-proof film, rust-proof paper, export fumigation/fumigation-free wooden crates, shipping marks, gross weight, net weight, etc.

We will provide full reception services to support the customers' on-site inspection of the goods.

Hot Rolling Production Line

Cold rolling precision processing

Cold drawing/cold rolling line

Hot Rolling Production Line

Hot rolling production line (producing hot-rolled coils/medium-thick plates, thickness 2–60mm)

Cold rolling precision processing

(Producing ultra-thin / high-precision / shiny panels, with thickness ranging from 0.1 to 3mm, for high-end products)
Cold drawing/cold rolling line

(High-precision cold-drawn round steel, square steel, hexagonal steel, and special-shaped bars)

Cold drawing/cold rolling line

(High-precision cold-drawn round steel, square steel, hexagonal steel, and special-shaped bars)

Warehousing Management

A ten-thousand-ton standardized warehouse with grid-based zoning and system positioning enables rapid material retrieval and reduces the time spent searching for materials.

Inbound inspection: Verify the physical items against the inbound form, inspect the appearance, dimensions, and labels. Once confirmed to be correct, the materials are entered into the ERP system and processed for storage.

Logistics and Global Delivery: Self-operated fleet + contracted logistics partners; expedited service available for urgent orders.

International Shipping: Supports FOB, CIF, DDP, and other trade terms, covering 100+ countries and regions.

Process: Booking → Trucking → Customs Declaration → Loading onto Ship/Aircraft → Bill of Lading Issuance → Document Delivery → Destination Port Customs Clearance (Optional) → Last-Mile Delivery.

Provides door-to-door one-stop logistics with full tracking to ensure safe and timely arrival of goods.

After-Sales Service and Traceability: Delivery receipts, logistics information, and quality inspection documents are sent to customers within 24 hours of shipment.

Established a full product lifecycle traceability system, allowing tracking of production, quality inspection, warehousing, and transportation records.

Follow-up inspection within 72 hours of arrival; rapid response and handling of quality issues; assistance in resolving customs clearance issues for foreign trade orders.

Packaging Method