Stainless Steel Seamless Pipes and Tubes Manufacturer in India

Stainless Steel Seamless Pipes and Tubes Manufacturer & Supplier in India

PPTL is one of the leading manufacturer and supplier of the stainless steel seamless pipes & tubes from Mumbai, India. We supply relevant SS Seamless Pipes, Stainless Steel Welded Pipe, & Stainless Steel U Tubes to our customers in India and overseas, based on our stainless steel seamless pipe factory. ASTM, ASME, and DIN standards are strictly followed when manufacturing stainless steel seamless pipes.

Grades

Stainless Steel Seamless Pipe
Diameter Of Stainless Pipe 1/8″ thru 12″
300 Series Stainless Steel Grades 304 – 304/L – 304H – 309/S – 309H – 310/S – 310H – 316L – 317L – 321 – 321H – 347 – 347H
400 Series Stainless Steel Grades 410
Nickel Alloy Grades  Alloy 20 – 200 – 400 – 600 – 601 – 625 – 825H – 825HT – C276

About Stainless Steel Seamless Pipes

Mechanical properties testing, supersonic testing, eddy current testing, hydrostatic testing, and chemical tests are among the tests we may do on our products. We provide a 100 percent quality guarantee for our products as one of India's leading stainless steel seamless pipe suppliers. We stock and supply stainless steel seamless pipes with diameters ranging from 6mm to 610mm and thicknesses up to 30mm. PPTL Industries specialises in thin walled seamless pipes and seamless pipes with a high wall thickness.

Stainless Steel Seamless Pipe Sizes Table

Description Size (Range) (Seamless) Thickness (Range) (Seamless) Length
Austenitic Stainless Steel Tube Diameter Pipe Diameter Tube Thickness Pipe Thickness 25 MTR
6 mm OD to 101.6 mm OD 1/8″ NB TO 8″NB 0.5 mm TO 4 mm 0.5 mm TO SCH 160

Manufacturing Process of Stainless Steel Seamless Pipes

Tube Reduction - Pilgering-

Also known as cold pilgering this process reduces the size of a metal tube across three dimensions: outside diameter, internal diameter and wall thickness.

Cold Drawing Process

This is the other way of cold drawing tubes to reduce their size. Here the tube is pulled through a die which is smaller than the tube, so the end of each tube needs to be machined in order to fit. It will be ‘swaged’ or ‘tagged’ before drawing. Following this procedure, the tube end can pass through the die and is clamped to a drawing trolley, also called a pulley, which draws the tube through the die.

The machine used for this process is called a draw bench, and we have them in various sizes. A smaller one is used each time the tube is reduced. They are equipped with different tools so they can perform different types of cold drawing such as:

Sink Drawing

This is the simplest drawing procedure. The tube is drawn through a hardened die made of polished tool steel or, for smaller sizes, an industrial diamond. With the correct lubrication, when the tube surface comes into contact with the polished die surface it is worked smooth. The inside bore surface is not constrained so the wall thickness of the tube will always increase when it’s drawn. Large cross sectional area reductions can be performed using this technique.


Plug drawing

This is the type of drawing used for the highest quality output. The outside and inside diameters of the tube are worked at the same time. A plug made of high grade tool steel with a polished surface is located precisely in the middle of the outside diameter drawing die. The tube is loaded over the plug attached to a fixed rod. As the tube is drawn through the die the burnishing action of the metal flowing over the stationary plug imparts a high tolerance surface finish inside the tube.

When properly lubricated and prepared the ID will show very few defects and finishes of 0.20 microns Ra are achieved. Therefore, plug drawing is chosen to significantly improve the ID surface condition.


Annealing process

The annealing process homogenises the metallurgical microstructure of the tube. As the grain structure of the tube after drawing is stressed, the material becomes hard and brittle. To be able to draw the tube again, the stress needs to be removed to return the material to its normal state.

During annealing, the tubes are exposed to a controlled temperature (up to 1200°C) and soak time. Through this process the tube remains in shape, but the grains in the structure of the tube reform into a regular unstressed pattern. The annealed tube is then softer and can be redrawn.

For high pressure tubes final heat treatment is not required. This leaves the material in a hard drawn condition enhancing the mechanical properties of the tube

Chemical Properties of Stainless Steel Seamless Pipes & Tubes

Grade DIN (EN) % C(Max) % Mn Max % P (Max) % S (Max) % SI(Max) % CR % Ni % Mo % N Max % CU Max % OTHERS
Austenitic 304 1.4301 0.080 2.00 0.045 0.030 0.75 18.00-20.00 8.00-10.50 0.10
304H 1.4948 0.04-0.10 2.00 0.045 0.030 0.75 18.00-20.00 8.00-10.50
304L 1.4307 0.030 2.00 0.045 0.030 0.75 18.00-20.00 8.00-12.00 0.10
304LN 1.4311 0.030 2.00 0.045 0.030 0.75 18.00-20.00 8.00-12.00 0.10-0.16
309 1.4828 0.20 2.00 0.045 0.030 0.75 22.00-24.00 12.00-15.00
309S 0.08 2.00 0.045 0.030 0.75 22.00-24.00 12.00-15.00
310 1.4841 0.025 2.00 0.045 0.030 1.50 24.00-26.00 19.00-22.00
310S 1.4845 0.08 2.00 0.045 0.030 1.50 24.00-26.00 19.00-22.00
316 1.4401 0.08 2.00 0.045 0.030 0.75 16.00-18.00 10.00-14.00 2.00-3.00 0.10
316L 1.4404 0.030 2.00 0.045 0.030 0.75 16.00-18.00 10.00-14.00 2.00-3.00 0.10
316LN 0.030 2.00 0.045 0.030 0.75 16.00-18.00 10.00-14.00 2.00-3.00 0.10-0.16
316Ti 1.4571 0.08 2.00 0.045 0.030 0.75 16.00-18.00 10.00-14.00 2.00-3.00 0.10 Ti = 5X (C+N) Min., 0.70 Max.
317 1.4449 0.08 2.00 0.045 0.030 0.75 18.00-20.00 11.00-15.00 3.00-4.00 0.10
317L 1.4438 0.030 2.00 0.045 0.030 0.75 18.00-20.00 11.00-15.00 3.00-4.00 0.10
317LN 0.030 2.00 0.045 0.030 0.75 18.00-20.00 11.00-15.00 3.00-4.00 0.10-0.22
321 1.4541 0.08 2.00 0.045 0.030 0.75 17.00-19.00 9.00-12.00 0.10 Ti = 5X (C+N) Min., 0.70 Max.
347 1.4550 0.08 2.00 0.045 0.030 0.75 17.00-19.00 9.00-13.00 Cb = 10XC Min.,1.00 Max.
Ferritic + Martensitic 409 1.4512 0.080 1.00 0.040 0.020 1.00 10.50-11.75 0.50 max. 0.030 Ti = 6X (C+N) Min., 0.70 Max.
409RC 0.02 1.00 0.040 0.030 1.00 10.50-11.75 0.50 max. 0.020 Ti = 5X C Min., 0.75 Max.
409M 0.03 0.8-1.5 0.03 0.030 1.00 10.80-12.50 1.50 max. 0.030 Ti = 0.75 Min.,
410 1.4006 0.15 1.00 0.040 0.030 1.00 11.50-13.50 0.75 max.
410S 0.08 1.00 0.040 0.030 1.00 11.50-13.50 0.60 max.
Ferritic 405 0.80 1.00 0.04 0.030 1.00 11.50-14.50 0.60 Al = 0.10 – 0.30
430 1.4016 0.12 1.00 0.04 0.030 1.00 16.00-18.00 0.75 max.
430Ti 0.030 1.00 0.04 0.030 1.00 16.00-19.00 Ti = 0.10 -1.0
436 0.12 1.00 0.040 0.030 1.00 16.00-18.00 0.75-1.25 Cb = 5X C Min., 0.80 max.
439 0.07 1.00 0.04 0.03 1.0 17.00-19.00 0.5 0.04 Al = 0.15, Ti = 0.2 -1.0

Mechanical Properties of Stainless Steel Seamless Pipes & Tubes

Grade Density Melting Point Tensile Strength Yield Strength (0.2%Offset) Elongation
304/ 304L 8.0 g/cm3 1400 °C (2550 °F) Psi 75000 , MPa 515 Psi 30000 , MPa 205 35 %
304H 8.0 g/cm3 1400 °C (2550 °F) Psi 75000 , MPa 515 Psi 30000 , MPa 205 40 %
310 / 310S / 310H 7.9 g/cm3 1402 °C (2555 °F) Psi 75000 , MPa 515 Psi 30000 , MPa 205 40 %
316/ 316H 8.0 g/cm3 1400 °C (2550 °F) Psi 75000 , MPa 515 Psi 30000 , MPa 205 35 %
316L 8.0 g/cm3 1399 °C (2550 °F) Psi 75000 , MPa 515 Psi 30000 , MPa 205 35 %
317 7.9 g/cm3 1400 °C (2550 °F) Psi 75000 , MPa 515 Psi 30000 , MPa 205 35 %
321 8.0 g/cm3 1457 °C (2650 °F) Psi 75000 , MPa 515 Psi 30000 , MPa 205 35 %
347 8.0 g/cm3 1454 °C (2650 °F) Psi 75000 , MPa 515 Psi 30000 , MPa 205 35 %
904L 7.95 g/cm3 1350 °C (2460 °F) Psi 71000 , MPa 490 Psi 32000 , MPa 220 35 %