304L Stainless Steel Seamless Pipe

304L stainless steel is the low carbon variant of 304, maximum carbon content is 0.03%, which reduces chromium carbide precipitation and significantly improves resistance to intergranular corrosion, especially in welded areas.

304L Stainless Steel Seamless Pipe are available in a variety of sizes and specifications that can be customized to meet customer needs, including different diameters, wall thicknesses and lengths.

商品説明

304L stainless steel seamless pipe is a low-carbon (C≤0.03%) austenitic stainless steel pipe, which helps to minimize the risk of intergranular corrosion during welding, manufactured through a seamless process, avoiding welding defects.

304L stainless steel is a low-carbon variant of 304 (carbon content ≤ 0.03%),the low-carbon design reduces chromium carbide precipitation,minimize the risk of intergranular corrosion during welding, significantly improves resistance to intergranular corrosion, especially in welded areas.

304L Seamless Pipe is available in a variety of sizes and specifications that can be customized to meet customer needs, including different diameters, wall thicknesses and lengths. The surface treatments include annealed, pickled, polished and plated to meet different application requirements.

304L Stainless Steel Seamless Pipe Specification

Standard: ASTM A312

Outdoor Diameter: 6.00 mm – 914.4 mm

Wall Thickness: 1mm – 150mm

Schedule: SCH5S, SCH10S, SCH40S, SCH80S, SCH160S, XS,SCH120,SCH160,etc

Length: Single Random, Double Random & Required Length

Type: Hot rolled, Cold rolled

Surface: Polishing,annealing,pickling,bright; 2B, No.4, No.1, No.8, 8K, HL, Mirror

End Finish: Plain End, Beveled End, Treaded

Additional Service: Custom cutting & beveling to spec lengths; Size and Specifications can be manufactured as clients’ requirements

304L Stainless Steel Chemical Composition

グレード		C	ムン	Si	P	S	Cr	モ	ニー	N
304L	min.	–	–	–	–	–	18.0	–	8.0	–
304L	max.	0.03	2.0	1.00	0.045	0.03	20.0	–	12.0	–

機械的特性

グレード

Tensile Strength

(MPa) min

Yield Strength

0.2% Proof (MPa) min

伸び

(% in 50mm) min

Hardness

Rockwell B (HR B) max

Brinell (HB) max

304L

485

170

201

Physical Properties

グレード	Density (kg/m³)	Elastic Modulus (GPa)	Mean Coefficient of Thermal Expansion (m/m/℃)			Thermal Conductivity (W/m.K)		Specific Heat 0-100℃ (J/kg.K)	Electrical Resistivity (n.m)
			0-100℃	0-315℃	0-538℃	at 100℃	at 500℃
304L	8000	193	17.2	17.8	18.4	16.2	21.5	500	720

Manufacturing Process

Formed from a single billet of cold-drawn or hot-rolled steel, has a uniform, dense structure without welded seams.
Conforms to ASTM A312/A249 standards, suitable for high pressure and high temperature environments.

Advantages over welded pipe

Higher strength: seamless structure to withstand higher pressure, suitable for boilers and chemical equipment.
Better precision: smooth inner wall, small dimensional tolerance, suitable for precision fluid transportation.
Corrosion resistance: no welding defects, more uniform corrosion resistance.

Excellent corrosion resistance and weldability

Low-carbon design reduces the risk of intergranular corrosion during welding and meets ASTM A312 standards. Maintains integrity over long periods, even in wet or chemical environments.

High strength and durability

Composed of 18-20% chromium and 8-12% nickel, it ensures stable performance under high temperature and high pressure, reducing the frequency of maintenance to save long-term cost.

Seamless reliability

Seamless design enhances the pipe’s ability to withstand pressure and avoid leakage, which is suitable for industries with strict hygiene and safety requirements, such as pharmaceutical and food industries.

Customization support

A wide range of sizes (OD DN6-DN600, wall thickness 0.5mm-50mm) and surface treatments (pickled, polished), available to meet the demand for non-standard sizes.

304L Seamless Pipe Application

304L stainless steel seamless pipe is a widely used material in industry for its excellent corrosion resistance and mechanical properties.

Chemical and Pharmaceutical: Acid-alkali transport pipelinesto ensure safety and no leakage.
Food Processing: Sanitary pipelines meeting FDA standards for food safety.
Energy Sector: High-temperature boilers and heat exchangers for stable performance.
Construction and Marine: Structural supports resisting moisture corrosion.

304L Stainless Steel VS. 304 Stainless Steel

Feature	304L	304
carbon centent	≤0.03%	≤0.08%
welding performance	Resistant to carbide precipitation, no annealing required	Annealing required after welding
Corrosion resistance	More resistant to intergranular corrosion (especially in welds)	Weaker
Low temperature toughness	Better (for -196°C)	Limited

304L Stainless Steel Seamless Pipe

商品説明

304L Stainless Steel Seamless Pipe Specification