Top Stainless Steel Seamless Pipe Supplier

We have been a leading stainless steel seamless pipe manufacturer in China since 2002, dedicated to producing high-quality seamless pipe products. Our rich experience ensures that we can meet all the needs of your project and provide the highest quality steel pipe products.

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304 Stainless Steel Seamless Pipe Industrial Grade

High-quality carbon structural steel per GB/T8163. Ideal for low/medium-pressure fluid conveyance & widely used in mechanical structural components.

Big OD Seamless Pipes

We can manufacture and supply seamless steel pipes with OD 1/8"(10.3mm)-56"(1422.4mm) and wall...

Introduction

Stainless Steel Seamless Pipes

Stainless steel seamless pipes are steel pipes produced from a single solid stainless steel ingot through processes such as piercing, rolling, and sizing, resulting in a pipe free of any seams or joints. Compared to welded steel pipes, seamless pipes offer superior strength, better leak-tightness, and higher pressure resistance, making them the preferred choice for applications involving high temperatures, high pressures, and highly corrosive environments.

Your Reliable Seamless Steel Pipe Manufacturer & Exporter

Dexin Group specializes in the manufacturing and global export of seamless steel pipes, providing customized solutions for oil & gas, construction, mechanical, and industrial applications. We deliver stable quality, flexible production, and professional export services for global buyers.

2002

Year Established

60,000 m²

Factory Area

20–30K tons

Monthly Capacity

220

Total Employees

Fast Delivery & Export Efficiency

With stable production lines and mature export experience, we ensure fast delivery for both standard and customized seamless steel pipe orders. Flexible scheduling allows us to support urgent project timelines for global EPC contractors and distributors.

Quick production cycles for common sizes and specifications
Strong export handling with global shipping support
Flexible MOQ for small and medium buyers

Full Range of Seamless Pipe Solutions

We offer a complete range of seamless steel pipes including carbon steel, alloy steel, and stainless steel grades, covering standards such as ASTM, API, and EN. From raw material selection to finishing, every step is strictly controlled to ensure consistent quality.

Standards: ASTM A106, A53, API 5L, EN10216, etc.
Applications: oil & gas, construction, mechanical engineering, boiler systems
Processes: hot rolled, cold drawn, heat treatment, surface finishing

Quality Assurance & Customization

Dexin focuses on delivering high-performance seamless pipes with strict quality control and customization capability. We support tailored specifications, third-party inspections, and international certifications to meet diverse project requirements.

Strict quality inspection and traceability system
Support for third-party inspection (SGS, BV, etc.)
Custom sizes, thickness, and material grades available
Reliable performance for high-pressure and critical applications

Stainless Steel Seamless Tube — Size Range

Manufactured to GB, ASTM/ASME, DIN/EN, BS, JIS and GOST standards. Custom sizes available per drawing or customer requirement.

Outer Diameter

8 – 1,422 mm

1/8" (10.3 mm) to 56" (1,422.4 mm)

Wall Thickness

1 – 150 mm

Up to 5.91" (150 mm)

OD Size Coverage

50+ sizes

From thin-wall to heavy-wall

Manufacturing

3 processes

Hot-rolled · Cold-drawn · Cold-rolled

Available Outer Diameters & Max Wall Thickness

OD × Wall Thickness Coverage

Rows = OD groups · Columns = wall thickness (mm) · Color intensity = wall thickness range

Thin wall ≤ 5 mm

Medium wall 5.5 – 20 mm

Heavy wall > 20 mm

Not available

Manufacturing Processes

Hot-rolled

OD 18 mm and above. Suitable for large diameters and heavy walls. Produced in annealed or normalized condition.

Cold-drawn

OD 8 – 219 mm, wall 1 – 14 mm. High dimensional accuracy, smooth surface finish, tight tolerances.

Cold-rolled

Small-to-medium OD, thin wall. Excellent surface quality and consistent mechanical properties.

Applicable Standards

GB/T 8162 GB/T 8163 GB/T 9948 GB/T 5310 GB/T 6479 ASTM A106 ASTM A213 ASTM A335 ASME SA213 ASME SA335 DIN 17175 EN 10216-2 EN 10297-1 JIS G3467 JIS G3458 JIS G3462 API 5L GB/T 9711 GB/T 18984 ASTM A333 GB/T 18248 GB/T 28884 ASTM A519 EN 10083 GOST

※ The specifications above represent standard production ranges. Sizes outside these ranges can be produced on request — please contact us with your drawing or requirements for confirmation.
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Applications of Large-Diameter Stainless Steel Seamless Pipes

Large-diameter stainless steel seamless tubes (OD 273 mm and above) are critical components in high-pressure, high-temperature and corrosive environments across a wide range of heavy industries.

Energy

Oil & Gas Pipelines

Long-distance crude oil and natural gas transmission lines demand large-bore, heavy-wall tubes capable of sustaining high operating pressures and resisting corrosion in harsh underground or subsea environments.

High-pressure transmission up to 20 MPa

Sour-service grades for H₂S-rich media

API 5L / ASTM A333 compliant supply

OD 273–914 mm WT 10–50 mm Gr. X52–X70 SMLS / ERW

Chemical

Petrochemical & Refinery

Distillation columns, heat exchangers and reactor vessels in refineries rely on seamless tubes that withstand elevated temperatures, aggressive chemicals and thermal cycling over decades of continuous operation.

Creep-resistant alloys for T > 450 °C

Resistance to sulfidation and oxidation

ASTM A213 / GB/T 9948 grades

OD 219–630 mm WT 8–60 mm 12Cr1MoV · T91 · P91 Hot-rolled

Energy

Power Generation

Steam headers, main steam lines and boiler drums in thermal and nuclear power plants require tubes with excellent high-temperature strength, oxidation resistance and certified impact properties.

Main steam lines up to 600 °C / 30 MPa

Ultra-supercritical boiler applications

GB/T 5310 / ASME SA335 certified

OD 299–762 mm WT 16–80 mm P91 · P92 · 15CrMoG IBR approved

Marine

Offshore & Subsea Structures

Offshore platform risers, subsea flowlines and jacket piles demand heavy-wall large-diameter tubes with superior toughness, weldability and resistance to seawater corrosion at extreme depths.

Subsea rated for water depths > 3,000 m

Low-temperature impact toughness (−60 °C)

DNV / ABS / Lloyd's Register certified

OD 406–1,016 mm WT 20–100 mm Duplex / Super duplex CTOD tested

Utilities

Water Treatment & Desalination

Large-bore stainless tubes are widely used in reverse osmosis pressure vessels, brine lines and municipal water mains where long service life, hygiene compliance and corrosion resistance are essential.

Pitting-resistant 316L / 2205 duplex grades

WRAS / NSF-61 food-grade compliant

Seamless bore — no weld seam corrosion risk

OD 273–660 mm WT 8–40 mm 316L · 2205 · 2507 Pickled & passivated

Nuclear

Nuclear Power

Primary and secondary coolant circuits, steam generators and containment components require nuclear-grade seamless tubes with stringent cleanliness, traceability and radiation-resistance requirements.

NB/T 20006 / RCC-M nuclear qualification

Full PMI, UT and hydrostatic testing

Controlled chemistry for neutron economy

OD 219–508 mm WT 12–60 mm 316LN · 304LN · 347H 100% NDT

Energy

LNG & Cryogenic Transport

Liquefied natural gas terminals, cryogenic storage tanks and transfer headers require austenitic stainless tubes that retain ductility and impact strength at operating temperatures as low as −196 °C.

Certified to −196 °C Charpy impact values

304L / 316L low-carbon grades standard

ASTM A333 Gr.8 / GB/T 18984 supply

OD 273–762 mm WT 10–50 mm 304L · 316L Cold-drawn finish

Mining

Mining & Mineral Processing

Slurry pipelines, ore processing vessels and acid leaching circuits need large seamless tubes engineered for abrasion resistance, high-pH media and continuous high-volume throughput.

Wear-resistant duplex grades for slurry lines

Resistance to acidic and alkaline media

Heavy-wall sections for long service intervals

OD 325–914 mm WT 14–80 mm 2205 · 2507 · 904L Hot-rolled + normalized

Construction

Structural & Civil Engineering

Large-diameter hollow sections are used in long-span bridges, high-rise building columns, tunneling shield support and coastal infrastructure where architectural appearance and structural integrity both matter.

High yield strength for slender column design

Corrosion-resistant for coastal environments

EN 10297-1 / ASTM A519 structural grades

OD 406–1,219 mm WT 12–60 mm S355 · Q345 · 316 Polished option available

All tubes can be supplied to GB, ASTM/ASME, DIN/EN, BS, JIS and GOST standards. Custom OD, wall thickness, length and end treatment available on request.

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