Stainless Steel 321 Welded Pipe Specifications

The table below lists core specifications for ASTM A312 TP321 welded pipe supplied by Sachiya Steel International.

Specification Details
Standard ASTM A312 / ASME SA312, ASTM A358 / ASME SA-358
Nominal Pipe Size 1/2" NB to 24" NB
Outside Diameter 6.35 mm to 914.4 mm
Wall Thickness Per schedule: SCH 5S, 10S, 40, 80, 80S, 160, XXS
Length Up to 6 metres standard; custom lengths on request
Form ERW Pipe (ASTM A312), EFW Pipe (ASTM A358)
End Types Plain End, Beveled End, Threaded
Surface Finish No.1, No.4, No.8 Mirror, 2B
Delivery Condition Annealed and Pickled, Polished, Bright Annealed
Dimensional Standard ASME B36.19M, ASME B36.10M

Stainless Steel 321 Welded Pipe Size Chart

This table provides the essential dimensional ranges and schedule specifications for industrial-grade SS 321 welded pipes.

Parameter Range
Nominal Pipe Size (NPS) 1/2" to 24" (Standard), up to 48" (Custom)
Outside Diameter (OD) 21.3 mm to 609.6 mm (Up to 914.4 mm for 24" NB)
Schedules 5S, 10S, 40, 80, 80S, 160, XXS
Standard Lengths 6 Metres (20 ft)
Manufacturing Standards ASME B36.19M, ASME B36.10M
Custom Lengths Precision cut-to-length available

Stainless Steel 321 Welded Pipe Size Chart

This table shows SS 321 piping's diameter, wall thickness, and weight to help engineers estimate project costs.

NPS OD (inch / mm) SCH 10S (kg/m) SCH 40 (kg/m) SCH 80 (kg/m)
1/2" 0.840 / 21.3 0.8 1.27 1.62
1" 1.315 / 33.4 2.09 2.5 3.24
2" 2.375 / 60.3 3.93 5.44 7.48
4" 4.500 / 114.3 8.63 16.07 22.32
6" 6.625 / 168.3 12.39 28.26 42.56
8" 8.625 / 219.1 20.06 42.55 64.64

Stainless Steel 321 Welded Pipe Price

SS 321 welded pipe prices range from approximately ₹100 to ₹350 per kg in the Indian market. International pricing falls between $3 and $8 per kg, subject to OD, wall thickness, schedule, quantity ordered, and surface finish. Current rates for ASTM A358 EFW pipe tend to run higher than standard A312 ERW pipe due to the welding process involved. Request a quote for current market pricing.

Chemical Composition of Stainless Steel 321 Welded Pipe

The table below shows the chemical composition of TP321 (UNS S32100) welded pipe per ASTM A312/ASME SA312.

Carbon C
Max 0.08%
Manganese Mn
Max 2.00%
Phosphorus P
Max 0.045%
Sulfur S
Max 0.030%
Silicon Si
Max 1.00%
Chromium Cr
17.0 – 19.0%
Nickel Ni
9.0 – 12.0%
Titanium Ti
5×(C+N) min, 0.70% max
Nitrogen N
Max 0.10%

Mechanical Properties of Stainless Steel 321 Welded Pipe

Mechanical properties below are minimum values per ASME SA312 for Grade TP321 welded pipe.

The tensile strength is 515 MPa, and the yield strength is 205 MPa. These seamless pipes can stretch 35% longer than other pipes, making them more flexible and structurally sound for a variety of high-pressure industrial piping systems.

75 / 515
MPa (ksi)
Tensile Strength
30 / 205
MPa (ksi)
Yield Strength
35%
(min)
Elongation
Property Value Unit
Tensile Strength (min) 75 / 515 ksi / MPa
Yield Strength (min) 30 / 205 ksi / MPa
Elongation (min) 35 %
Request a Quote for SS 321 Welded Pipe: All Sizes and Schedules Available. Request a Quote

Equivalent Grades of Stainless Steel 321 Welded Pipe

Stainless Steel 321 carries designations under multiple international standards. The table below maps equivalent grades.

Standard Designation
UNS S32100
Europe (EN/DIN) EN 1.4541 / X6CrNiTi18-10
Japan (JIS) SUS 321
China (GB) 06Cr18Ni11Ti / 0Cr18Ni10Ti
India (IS) 10Cr18Ni10Ti
Russia (GOST) 08Kh18N10T
UK (BS) 321S31
France (AFNOR) Z6CNT18-10
Sweden (SS) SS 2337

Industrial Applications of Stainless Steel 321 Welded Pipe

SS 321 welded pipe serves major industrial sectors where high-temperature corrosion resistance and post-weld integrity are critical.

Oil, Gas, and Petrochemical Industry

Between 430°C to 816°C, refineries and petrochemical industries employ TP321 welded pipe for furnace tubes, catalytic reformer pipework and transfer lines.

Power Generation and Heat Exchangers

Alloy 321 welded pipe is installed in boiler tubing, superheater sections, and shell-and-tube heat exchangers. Creep resistance at elevated temperatures reduces the risk of premature failure.

Aerospace and Exhaust Systems

Aerospace tube and automobile exhaust manifolds use alloy 321 SS pipe for oxidation resistance and mechanical stability above 500°C. Repeated heating and cooling won't sensitise the grade.

Food Processing and Pharmaceutical Equipment

Sanitary piping in food and pharmaceutical plants uses SS 321 welded pipe where process temperatures are high and intergranular corrosion would compromise purity.

Stainless Steel 321 vs 304 Welded Pipe

SS 304 is the cost-effective standard for general corrosion resistance, whereas SS 321 is required for high-temperature applications, including exhaust manifolds and furnaces. components. The titanium content ensures the pipe's structural integrity and corrosion resistance, even after extensive welding and extreme temperature cycling.

Feature Stainless Steel 321 Stainless Steel 304
Alloying Element Titanium-stabilised Standard 18/8 Chrome-Nickel
Max Service Temp 815°C to 900°C Up to 425°C (Continuous)
Intergranular Corrosion Immune (due to Ti-carbides) Susceptible after welding/heating
High-Temp Creep Superior Strength Moderate/Lower Strength
Welding Stability Excellent (No post-weld anneal) Risk of "Weld Decay" in thick sections
Typical Cost Higher (due to Titanium) Most Economical

Shipping & Packaging

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

We strictly follow seaworthy export handling standards to protect 321 welded 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:

Can You Weld 321 Stainless Steel Pipe? +
Yes, SS 321 pipe can be welded using GTAW, GMAW, and SMAW processes. Titanium stabilisation prevents carbide precipitation at grain boundaries, so post-weld solution annealing isn't required in most applications.
What is the Price of SS 321 Welded Pipe per Kg? +
In India, prices range from about ₹100 to ₹350 per kg, and internationally, they range from $3 to $8 per kg. The final price varies on the OD, wall thickness, schedule, quantity, and finish.
What Sizes are Available for SS 321 Welded Pipe? +
Sizes are available in schedules 5S, 10S, 40, 80, 80S, 160, and XXS, with a range of sizes from 1/2" NB to 24" NB (6.35 mm to 914.4 mm OD). Custom-cut lengths are available, with standard lengths reaching up to 6 meters.
What is the Difference Between SS 321 ERW and EFW Welded Pipe? +
ERW (Electric Resistance Welded) pipe per ASTM A312 suits smaller diameters and standard-pressure piping. EFW (Electric Fusion Welded) pipe per ASTM A358 serves larger diameters and high-pressure, high-temperature process piping.
What ASTM Specification Covers SS 321 Welded Pipe? +
ASTM A312 / ASME SA312 covers seamless and welded austenitic SS pipe. ASTM A358 / ASME SA-358 covers electric-fusion-welded austenitic pipe for high-temperature service.
What Temperature Range is SS 321 Welded Pipe Suitable For? +
SS 321 welded pipe works continuously from 430°C to 816°C. It’s reliable. Titanium stabilisation ensures superior creep and stress-rupture performance over non-stabilised grades.
When Should I Choose SS 321 Welded Pipe Over SS 304? +
Choose SS 321 when piping operates above 430°C or undergoes repeated weld thermal cycles. The titanium in 321 prevents sensitisation and intergranular corrosion that 304 is susceptible to under sustained heat.
What Pipe Schedules Are Available for SS 321 Welded Pipe? +
Available schedules include SCH 5S, 10S, 40, 80, 80S, 160, and XXS per ASME B36.19M and ASME B36.10M dimensional standards.

Contact Us for Stock Availability and Current Pricing on SS 321 Welded Pipe. Request a Quote