Stainless Steel Large Diameter Pipe Specifications

The table below lists the core specifications of Stainless Steel Large Diameter Pipe, including standards, sizes, forms, and finishes.

Parameter Details
Standards ASTM A312 / ASME SA-312
Grades 304, 304L, 316, 316L, 317L, 321, 321H, 347
Outside Diameter NPS 14" (355.6 mm) to NPS 100"+ (2540 mm+)
Wall Thickness Schedule 5S to Schedule XXH (ASME B36.19M)
Lengths 6 m (20 ft), 12 m (40 ft), custom on request
Forms Seamless, EFW, SAW, LSAW, Spiral Welded
End Finish Plain end, bevelled end
Surface Finish Mill finish, pickled, polished

Available Sizes

The available sizes for Stainless Steel Large Diameter Pipes are listed in the following table.

Parameter Specification
Pipe Size Range NPS 14" to NPS 100"+
DN Range DN 350 to DN 2500+
Wall Thickness (Schedule) Sch 5S to XXH
Standard Lengths 6 meters, 12 meters
Custom Lengths Available on request

Stainless Steel Large Diameter Pipe Size Chart

The size chart below covers common NPS designations, outside diameters, and wall thicknesses for large diameter SS pipes.

NPS (inches) OD (mm) Schedule 5S WT (mm) Schedule 10S WT (mm) Schedule 40S WT (mm)
14 355.6 3.96 6.35 11.13
16 406.4 4.19 6.35 12.70
18 457.2 4.19 6.35 14.27
20 508.0 4.78 6.35 15.09
24 609.6 5.54 6.35 17.48
30 762.0 6.35 7.92 Custom
36 914.4 7.92 9.53 Custom

Pipe Schedule and Wall Thickness

The pipe schedule and wall thickness of Stainless Steel Large Diameter pipes are listed in the table given below.

Aspect Details
Lower Schedules 5S, 10S – suitable for low-pressure or structural applications
Higher Schedules 40S, 80S, XXH – used for pressure piping as per ASME B31.3
Thickness Relationship Wall thickness increases with a higher schedule number
Example (24-inch Pipe) Schedule 5S: 5.54 mm
Schedule 40S: 17.48 mm
Impact on Weight An increase from 5S to 40S approximately triples pipe weight per metre

Stainless Steel Large Diameter Pipes Price

Stainless steel large diameter pipe prices start from approximately Rs 255/kg in India and $3.00-3.50/kg USD for Grade 304. Grade 316/316L is 15-25% higher. Pricing depends on factors like grade, OD, wall thickness, schedule, quantity, surface finish, and market rates. We provide detailed quotations based on your project requirements. Contact our sales team for up-to-date pricing and bulk order discounts.

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Stainless Steel Large Diameter Pipe Grades

Large diameter SS pipes are supplied in 3 austenitic grades. Grade selection depends on the operating environment, temperature, and corrosion exposure.

Grade 304

Grade 304 is the most widely used and cost-effective option, containing 18.0-20.0% Cr and 8.0-11.0% Ni. It suits water treatment, food processing, and general structural work.

Grade 316

The addition of 2.00-3.00% molybdenum distinguishes 316 from 304. Molybdenum delivers superior resistance to chloride pitting and crevice corrosion, making 316 the standard choice for marine, offshore, and chemical plant piping.

Grade 316L

Grade 316L costs 15-25% more than 304 but is necessary wherever chloride exposure is a factor. It is the lower carbon version of 316L. The grade is used in marine environments, offshore and piping systems.

Types of Stainless Steel Large Diameter

Large diameter stainless steel pipes are produced in 3 different types. The choice depends on diameter, pressure class, and project specifications.

EFW (Electric Fusion Welded) Pipes

EFW (Electric Fusion Welded) Pipes

Seamless Large Diameter Pipes

Seamless Large Diameter Pipes

SAW and Spiral Welded Pipes

SAW and Spiral Welded Pipes

Industrial Applications of Stainless Steel Large Diameter Pipes

Stainless steel large diameter pipes serve 5 major industries where corrosion resistance and high volumetric flow are critical.

Oil & Gas

Large diameter SS pipes transport crude oil, natural gas, and produced water across long-distance pipeline networks and processing facilities.

Water Treatment and Desalination

Desalination plants and city water systems use 316L large diameter pipes.

Petrochemical and Chemical Processing

Chemical reactors, heat exchangers, and acid transfer lines depend on 316L grades.

Power Generation

It is used in steam pipelines, condenser tubes, and cooling water circuits in thermal and nuclear power plants.

Marine and Offshore

316L large-diameter pipes are used for seawater intake lines, ballast systems, and structural supports on offshore platforms.

Stainless Steel Large Diameter Pipes vs Standard Size Pipes

The table below compares large diameter pipes (NPS 14" and above) with standard size pipes (below NPS 14"). Large diameter pipes require certification for most pressure applications, while standard pipes up to NPS 12" are covered under ASTM A312 alone.

Parameter Large Diameter Pipes Standard Size Pipes
Size Range NPS 14" to 100"+ NPS 1/8" to 12"
Primary Standard ASTM A358 / ASME SA-358 ASTM A312 / ASME SA-312
Manufacturing EFW, SAW, LSAW, Spiral Seamless, ERW
Typical Application Trunk lines, main headers Branch lines, instrumentation
Wall Thickness Schedule 5S to XXH Schedule 5S to 160

Shipping & Packaging

Main export packaging setup Heavy-duty wooden boxes Packing
Export Packaging Standard

We strictly follow seaworthy export handling standards to protect stainless steel large diameter pipe from transit damage, moisture ingress, and surface contamination during long-distance dispatch.

  • Heavy-duty wooden boxes with moisture barrier lining
  • HDPE stretch film wrapping on all bundles
  • Plastic end caps on threaded and plain-end pipes
  • Silica gel desiccants to minimize moisture exposure
  • ISPM-15 fumigated wooden packaging for export
shipping preparation Pipe Bundle Yard Staging
Shipping packaging Container End-Cap Protection
Shipping stock Wrapped Export-Ready Bundles

We Export Worldwide

Sachiya Steel International supplies stainless steel products to major industrial markets across North America, Europe, the Middle East, Asia and Africa with export-ready documentation and logistics support.

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Frequently Asked Questions

What sizes are available in Stainless Steel Large Diameter Pipes?+
Stainless steel large diameter pipes are available from NPS 14" (355.6 mm) to NPS 100"+ (2540 mm+). Schedules range from 5S to XXH per ASME B36.19M, with standard lengths of 6 m and 12 m.
What ASTM standards apply to Stainless Steel Large Diameter Pipes?+
The key standard that applies to Stainless Steel Large Diameter pipes is ASTM A312 / ASME SA-312 for seamless and welded pipes.
What is the price of Stainless Steel Large Diameter Pipes?+
Prices begin at approximately Rs 255/kg for Grade 304 in India. International pricing ranges from $3 to $12/kg USD depending on grade, diameter, wall thickness, and order volume. Contact us for a current quotation.
Which grades are available in Large-diameter Stainless Steel Pipes?+
We stock grades 304, 304L, 316, 316L, 317L, 321, 321H, and 347 per ASTM A312 / ASME SA-312. Grade 304/304L offers the best cost efficiency, while 316/316L provides superior chloride resistance.
What is the difference between ASTM A312 and ASTM A358 Large Diameter Pipes?+
ASTM A312 covers both seamless and welded austenitic SS pipes up to NPS 24" seamless. ASTM A358 is specifically written for electric-fusion-welded pipes used in larger diameters and higher pressure classes.
What industries use Stainless Steel Large Diameter Pipes?+
SS Large Diameter pipes are found in oil and gas, petrochemical, water treatment, power generation, and marine/offshore construction. Each sector relies on the corrosion resistance and flow capacity provided by large-diameter stainless pipes.
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