Stainless Steel Pipes & Tubes

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Stainless steel pipes and tubes are critical to numerous industries where a resistance to corrosion, a precision and durability is required. Copper and nickel alloys Pipes and Tubes come in various specifications like ASTM A312, ASTM A213, ASTM A269 and are manufactured from stainless steel. Such pipes & tubes are supplied by our company in different types and grades like 304, 316, 316L, SS 904L & others. Kalpataru Piping is renowned for the precision and quality in manufacturing and supplying stainless steel pipes.

You may be a procurement engineer sourcing pipes to use in an oil and gas project, a project manager specifying tubing to use in a pharmaceutical plant, or a contractor building a food-grade processing lines – whatever the case, this page has all the specifications, grades, and dimensions, weight charts, and application information you are looking.

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Table of Contents

Stainless Steel Pipe & Tube Specifications

Parameter Details
Standards ASTM / ASME SA213, A249, A269, A312, A358 CL. I to V, A789, A790
Dimensions Per ASTM, ASME, and API
Seamless / Welded / ERW / EFW All types available
NB Size Range 1/8″ NB to 30″ NB
EFW Pipe Size 6″ NB to 100″ NB
ERW Pipe Size 1/2″ NB to 24″ NB
Schedules SCH 5S, 10S, 20, 30, 40S, STD, 80S, XS, 120, 140, 160, XXS
Forms Round, Square, Rectangular, Hydraulic, Custom
Lengths Single Random, Double Random, Cut-to-Length
End Finish Plain End, Beveled End, Threaded
Surface Finish 2B, No.4, No.8 Mirror, Electro-polished
Duplex / Super Duplex UNS 31803, 32205, 32750, 32760
DIN / EN Grades 1.4301, 1.4401, 1.4541, 1.4462, EN 10216-5

Chemical Composition of Stainless Steel Pipes and Tubes

Grade C max Si max Mn max P max S max Cr % Ni % Mo %
TP304 / 1.4301 0.08 1.00 2.00 0.045 0.030 18.0-20.0 8.0-10.5 –
TP304L / 1.4307 0.035 1.00 2.00 0.045 0.030 18.0-20.0 8.0-12.0 –
TP316 / 1.4401 0.08 1.00 2.00 0.045 0.030 16.0-18.0 11.0-14.0 2.0-3.0
TP316L / 1.4404 0.035 1.00 2.00 0.045 0.030 16.0-18.0 10.0-14.0 2.0-3.0
TP316Ti / 1.4571 0.08 1.00 2.00 0.045 0.030 16.0-18.0 10.0-14.0 2.0-3.0
TP321 / 1.4541 0.08 1.00 2.00 0.045 0.030 17.0-19.0 9.0-12.0 –
TP310S / 1.4845 0.08 1.00 2.00 0.045 0.030 24.0-26.0 19.0-22.0 0.75 max
TP317L / 1.4449 0.08 1.00 2.00 0.045 0.030 18.0-20.0 11.0-14.0 3.0-4.0
TP347H / 1.4912 0.04-0.10 1.00 2.00 0.045 0.030 17.0-19.0 9.0-13.0 –

Mechanical Properties of Stainless Steel Pipes and Tubes

Grade Heat Treatment Min. Temp C Tensile Strength (MPa) Yield Strength (MPa) Elongation % min
TP304 Solution Annealed 1040 515 205 35
TP304L Solution Annealed 1040 485 170 35
TP304H Solution Annealed 1040 515 205 35
TP316 Solution Annealed 1040 515 205 35
TP316L Solution Annealed 1040 485 170 35
TP316Ti Solution Annealed 1040 515 205 35
TP321 Solution Annealed 1040 515 205 35
TP321H Solution Annealed 1050 / 1100 515 205 35
TP310S Solution Annealed 1040 515 205 35
TP347 Solution Annealed 1040 515 205 35
TP347H Solution Annealed 1050 / 1100 515 205 35

Different Grades of Stainless Steel Pipe & Tube 

Grade UNS Werkstoff Nr. Key Feature Common Standard
SS 304 S30400 1.4301 General corrosion resistance ASTM A312
SS 304L S30403 1.4307 Low carbon, weld-friendly ASTM A312
SS 316 S31600 1.4401 Molybdenum, pitting resistance ASTM A312
SS 316L S31603 1.4404 Low carbon + Mo ASTM A312
SS 316Ti S31635 1.4571 Ti-stabilized, high temp ASTM A312
SS 321 S32100 1.4541 Ti-stabilized, sensitization-free ASTM A213
SS 347 S34700 1.4550 Nb-stabilized, creep resistant ASTM A213
SS 310S S31008 1.4845 High-temp oxidation resistance ASTM A213
SS 904L N08904 1.4539 Acid-resistant, high alloy ASTM B677

Stainless Steel Pipe Dimensions and Weight Chart

The table below provides outer diameter, wall thickness, and weight per meter for standard stainless steel pipe schedules as per ASTM / ASME standards. All weights are in kg/m.
NB mm NPS inch OD mm Sch-10S (mm/kg/m) Sch-40S (mm/kg/m) Sch-80S (mm/kg/m)
15 1/2 21.3 2.11 / 1.00 2.77 / 1.27 3.75 / 1.62
25 1″ 33.4 2.77 / 2.09 3.38 / 2.50 4.55 / 3.24
50 2″ 60.3 2.77 / 3.93 3.91 / 5.44 5.54 / 7.48
100 4″ 114.3 3.05 / 8.36 6.02 / 16.07 8.56 / 22.3
150 6″ 168.3 3.40 / 13.84 7.11 / 28.3 10.97 / 42.7
200 8″ 219.1 3.76 / 19.96 8.18 / 42.6 12.7 / 64.6
300 12″ 323.9 4.57 / 36.00 9.52 / 73.88 12.7 / 132.0
For full size charts including square and rectangular tubes, large diameter pipes (up to 100″ NB), and round tube size-by-thickness matrices, contact our technical sales team or request a quote.

Outside Diameter Tolerance for Stainless Steel Pipes (ASTM A312)

NPS (inch) + Tolerance (inch / mm) – Tolerance (inch / mm)
1/8 to 1.5″ 1/64″ / +0.4 mm 1/32″ / -0.8 mm
> 1.5″ to 4″ 1/32″ / +0.8 mm 1/32″ / -0.8 mm
> 4″ to 8″ 1/16″ / +1.6 mm 1/32″ / -0.8 mm
> 8″ to 18″ 3/32″ / +2.4 mm 1/32″ / -0.8 mm
> 18″ to 26″ 1/8″ / +3.2 mm 1/32″ / -0.8 mm
> 26″ to 34″ 5/32″ / +4.0 mm 1/32″ / -0.8 mm
> 34″ to 48″ 3/16″ / +4.8 mm 1/32″ / -0.8 mm

Manufacturing Process of Stainless Steel Pipes and Tubes

Understanding the manufacturing process helps engineers and procurement teams specify the right pipe type for their application. Kalpataru Piping produces pipes and tubes using three primary methods.
  1. Seamless Stainless Steel Pipes & Tubes
Seamless pipes are produced from solid round billets, which are pierced and rolled into hollow tubular form without any weld seam. The process involves:
  • Billet heating and rotary piercing to form the hollow shell.
  • Elongation rolling (mandrel mill or push bench) to achieve the target wall thickness.
  • Sizing mill pass to achieve final OD and dimensional tolerances.
  • Solution annealing heat treatment (typically 1040 degrees C / 1900 degrees F) followed by water quenching.
  • Straightening, pickling / passivation, and final inspection.
Seamless pipes are preferred for high-pressure, high-temperature, and critical corrosive service since they are free from weld seam-related stress concentrations. Manufacturing specs, seamless: ASTM A312, ASTM A213, ASTM A269. OD 6 mm to 101.6 mm (tubes); up to 30″ NB (pipes).
  1. Welded Stainless Steel Pipes & Tubes
Welded pipes and tubes are produced by forming flat stainless steel strip or coil into a tubular cross-section and joining the longitudinal seam by welding. Two sub-processes apply:
  • Hot forming: strip is heated before forming, suitable for larger diameter pipes where room-temperature forming is not practical.
  • Cold forming: strip is formed at ambient temperature, producing a smooth inner surface and tighter dimensional tolerances. Preferred for small-to-medium diameter tubes.
After welding, tubes undergo solution annealing, weld bead inspection, eddy current testing, hydrostatic testing, and final dimensional checks. Manufacturing specs, welded: ASTM A249, ASTM A269, ASTM A312, ASTM A554, EN 10217-7. OD 1/4″ to 4-1/2″ (tubes); up to 24″ NB (ERW pipes).
  1. ERW and EFW Pipes
  • ERW Pipes: formed by rolling stainless steel coil/strip into tubular form and welding the seam using electric resistance, no filler material. Provides uniform strength and a clean finish. Range: 1/2″ NB to 24″ NB. Standard: ASTM A312.
  • EFW Pipes: formed by rolling stainless steel plates and welding the seam by high-voltage electric fusion. Suitable for large diameter pipes from 6″ NB to 100″ NB. Available in SS 304/304L, 316, 316L. Standard: ASTM A312.

Seamless vs Welded Stainless Steel Pipes: Which to Choose?

This is one of the most common questions from procurement engineers. Here is a direct comparison to guide your selection.
Comparison Factor Seamless Pipe Welded Pipe
Manufacturing Extruded from solid billet, no seam Formed from strip/plate, longitudinal weld seam
Pressure Rating Higher, no weld zone weakness Slightly lower, weld seam is the limiting factor
Dimensional Accuracy Good, slight wall thickness variation possible Excellent, tight OD/wall tolerance
Surface Finish Standard inside and outside Smoother ID, better for hygienic applications
Cost Higher, complex process Lower, faster and more efficient production
Availability (Sizes) Up to 30″ NB Up to 100″ NB (EFW)
Best Applications High-pressure piping, oil and gas, power plants Food processing, pharma, HVAC, general industrial
Standards ASTM A312, A213, A269 ASTM A312, A249, A269, A358
Rule of thumb: for operating pressures above 150 bar or temperatures above 500 degrees C, specify seamless. For general process piping, instrumentation tubing, and food-grade applications, welded tubes offer equivalent performance at a lower cost.

Applications of Stainless Steel Pipes and Tubes by Industry

  • Oil and Gas Industry
  • Pharmaceutical and Biotech Industry
  • Food Processing and Dairy Industry
  • Chemical and Petrochemical Industry
  • Power Generation
  • Construction and Architecture

Quality Assurance and Testing

Every stainless steel pipe and tube produced by Kalpataru Piping passes through a rigorous multi-stage quality control programme conducted by an independent quality control department. Destructive Testing
  • Tensile test to verify UTS and yield strength per ASTM standards.
  • Hardness test (Brinell / Rockwell) to confirm material heat treatment state.
  • Impact (Charpy) test for low-temperature service grades.
  • Flattening test, flare test, and reverse bend test for tubes.
Non-Destructive Testing
  • 100% hydrostatic pressure test on each pipe individually.
  • Eddy current testing for surface and sub-surface defect detection in tubes.
  • Ultrasonic testing for wall thickness verification and internal defect detection.
  • X-ray / radiography for weld seam integrity in EFW and welded pipes.
  • Dye penetrant / magnetic particle inspection as required by customer specification.
Documentation
  • Mill Test Certificate per EN 10204 3.1 or 3.2 (third-party inspection available).
  • Chemical composition and mechanical property reports for each heat.
  • Dimensional inspection reports and pressure test records.
  • Material traceability from raw billet to finished product.
Kalpataru Piping is a comprehensive stainless steel and specialty alloy supplier. If your project needs related materials or components, explore:

Frequently Asked Questions

What types of stainless steel pipes does Kalpataru Piping manufacture?

We manufacture seamless and welded stainless steel pipes, and round, square, and custom-shaped tubes, in grades including 304, 316, 904L, and Duplex steel.

How do seamless stainless steel pipes differ from welded pipes?

Seamless pipes are made from solid billet, giving higher strength and better resistance to high pressure. Welded pipes are formed by rolling strips of stainless steel and welding the seam, which suits general applications at a lower cost.

Which stainless steel grades are available?

We stock 304, 304L, 304H, 316, 316L, 316Ti, 310S, 904L, 317L, 321/321H, 347/347H, and Duplex steel, covering a wide range of industrial settings.

Can I order custom lengths, sizes, or wall thicknesses?

Yes, we offer customized stainless steel pipes and tubes to match project requirements, including dimensions, wall thickness, and other metallurgical conditions.

Which industries use your stainless steel pipes and tubes?

Our products are used in chemical, petrochemical, steel, oil and gas, pharmaceutical, food processing, shipping, and power generation industries.

Do your stainless steel pipes meet international standards?

Yes, all our pipes and tubes meet ASTM, ASME, DIN, and ISO standards to maintain consistent quality and performance globally.

Is international shipping available?

Yes, we provide international delivery to clients in multiple countries.

Do you provide inspection and testing reports with shipments?

Yes. All material is accompanied by material test certificates, and X-ray, hydrostatic, and mechanical testing reports as required by the project.

Can Kalpataru Piping handle urgent or emergency orders?

Yes, we take urgent and priority orders and deliver on time without compromising quality or specification.

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