SS seamless pipes grade 304 Diameter 21.3 mm X Sch 40

SS seamless pipes grade 304 Diameter 21.3 mm X Sch 40 Stockholders, Suppliers & Exporters in India.

We are leading manufacturers, stockholders & exporters of SS seamless pipes in Mumbai, India. Stainless steel (SS) seamless pipes are a fundamental part of industrial applications, providing superior durability, corrosion resistance, and strength. Among the various grades available, SS Grade 304 is one of the most popular for its balanced properties and affordability. Whether it’s used in construction, oil and gas, or chemical industries, SS 304 seamless pipes deliver consistent performance, especially when designed in specific dimensions like 21.3 mm diameter and Schedule 40 thickness. This article dives into why this specific configuration is highly sought after and what makes it a top choice for various industries.

What is SS Grade 304?

SS 304, or stainless steel 304, is an austenitic stainless steel known for its excellent resistance to corrosion, good mechanical properties, and versatility. The primary composition of Grade 304 includes 18% chromium and 8% nickel, giving it a strong resistance to oxidation and chemical damage. This makes it perfect for environments where the pipes may be exposed to moisture, acids, and other corrosive substances.

Schedule 40 (Sch 40): "Sch 40" relates to the wall thickness of the pipe. A Sch 40 pipe is known for its standard thickness, providing a balance between strength and ease of installation. It can withstand moderate pressures without being overly thick or heavy, making it perfect for applications such as water lines, gas systems, and more.

Specifications of SS Seamless Pipes

When selecting a pipe, two critical parameters are diameter and schedule. The diameter refers to the outer measurement of the pipe, while the schedule (Sch) indicates the thickness of the pipe wall, which in turn affects its pressure handling capacity.

A 21.3 mm diameter is a common size for many applications, providing the perfect balance of material strength without being overly bulky or heavy. Pipes of this size are often used in plumbing, irrigation, and industrial fluid transport, where medium flow rates are needed.

Schedule 40 refers to the pipe wall thickness. It is one of the most widely used schedules, especially in systems requiring moderate pressure and temperature handling. It strikes a balance between cost, durability, and performance, making it an ideal choice for various applications, including water and gas lines.

Mechanical Properties of SS 304 Seamless Pipes

SS 304 seamless pipes are valued for their mechanical strength. These pipes exhibit impressive tensile strength, meaning they can withstand significant pulling forces without breaking. Additionally, they have good ductility, allowing them to deform under stress rather than fracturing, which is critical in applications where pressure fluctuations occur.

Why Choose 21.3 mm X Sch 40 for Your Project?

Choosing 21.3 mm X Sch 40 is ideal for projects requiring moderate pressure and flow capabilities without incurring excessive costs. These pipes are robust enough for applications like fluid transportation and general plumbing, yet lightweight enough to be handled easily during installation. Whether you are working on industrial pipelines, construction projects, or irrigation systems, this specification offers an excellent balance of performance and affordability.

Industries that Rely on SS 304 Seamless Pipes

Several industries rely heavily on SS 304 seamless pipes for their projects, including::

  • Construction: For structural applications and plumbing
  • Oil and Gas: For pipelines, flow lines, and other critical systems
  • Food and Beverage: For pipelines, flow lines, and other critical systems and safe food processing
  • Chemical Plants: Withstanding exposure to chemicals and corrosive fluids

Stainless Steel Pipes Dimension – (S.S. Pipes)

ANSI B36.19 STAINLESS STEEL PIPE DIMENSION IN MM & WEIGHT PER KG.
Nominal Pipe Size Outside Diameter Schedule 5 S Schedule 10 S Schedule 20 S Schedule 40 S Schedule 80 S Schedule 160 S XXS
mm inch mm WT mm Weight (KGM) WT mm Weight (KGM) WT mm Weight (KGM) WT mm Weight (KGM) WT mm Weight (KGM) WT mm Weight (KGM) WT mm Weight (KGM)
3 1/8 10.3 1.2 0.20 1.24 0.28 1.5 0.33 1.73 0.37 2.41 0.47 - - - -
6 1/4 13.7 1.2 0.37 1.65 0.49 2.00 0.58 2.24 0.630 3.02 0.80 - - - -
10 3/8 17.1 1.2 0.47 1.65 0.63 2.00 0.74 2.31 0.840 3.20 1.10 - - - -
15 1/2 21.3 1.65 0.80 2.11 1.00 2.30 1.07 2.77 1.27 3.73 1.62 4.75 1.94 7.47 2.55
20 3/4 26.7 1.65 1.03 2.11 1.28 2.55 1.52 2.87 1.69 3.91 2.20 5.56 2.90 7.82 3.64
25 1 33.4 1.65 1.30 2.77 2.09 2.55 1.94 3.38 2.50 4.55 3.24 6.35 4.24 9.09 5.45
32 1.1/4 42.2 1.65 1.65 2.77 2.70 3.00 2.90 3.56 3.39 4.85 4.47 6.35 5.61 9.70 7.77
40 1.1/2 48.3 1.65 1.91 2.77 3.11 3.00 3.55 3.68 4.05 5.08 5.41 7.14 7.25 11.1 10.18
50 2 60.3 1.65 2.40 2.77 3.93 3.00 4.24 3.91 5.44 5.54 7.48 8.74 11.11 11.07 13.44
65 2.1/2 73.0 2.11 3.69 3.05 5.26 4.00 6.81 5.16 8.63 7.01 11.41 9.53 14.91 14.02 20.39
80 3 88.9 2.11 4.51 3.05 6.45 4.00 8.37 5.49 11.29 7.62 15.27 11.1 21.30 15.24 27.68
100 4 114.3 2.11 5.84 3.05 8.36 4.50 12.18 6.02 16.07 8.56 22.32 13.49 33.54 17.12 41.03
125 5 141.3 2.77 9.47 3.40 11.57 5.00 16.80 6.55 21.8 9.53 30.97 15.88 49.11 19.05 57.43
150 6 168.3 2.77 11.32 3.40 13.84 6.35 25.36 7.11 28.26 10.97 42.56 18.25 67.53 21.95 79.22
200 8 219.1 2.77 14.79 3.76 19.96 6.35 33.31 8.18 42.55 12.7 64.64 23.01 111.27 22.23 107.92
250 10 273.1 3.40 22.63 4.19 27.78 6.35 41.77 9.27 60.31 12.7 96.01 28.58 172.33 25.40 155.15
300 12 323.8 3.96 31.25 4.57 36.00 6.35 49.7 9.53 73.88 12.7 132.05 33.32 238.76 25.40 186.97
350 14 355.6 3.96 34.36 4.78 41.3 7.92 67.80 11.13 94.59
ASTM A 312 TP 304
ASTM A 312 TP 316L
ASTM A 312 TP 317L
400 16 406.4 4.19 41.56 4.78 47.29 7.92 77.83 12.7 123.30
450 18 457.2 4.19 46.81 4.78 53.26 7.92 87.71 14.27 155.80
500 20 508.0 4.78 59.25 5.54 68.61 9.53 117.14 15.09 183.42
600 24 610.0s 5.54s 82.47 6.35 94.45 9.53 141.12 17.48 255.41

Chemical Composition

CHEMICAL COMPOSITION ( IN PERCENTAGE )
Grade C (Max) Mn (Max) P (Max) S (Max) Si (Max) Cr Ni Mo Nitrogen (Max) Cu/ Others
301 0.15 2 0.045 0.03 1 16.00 – 18.00 6.00 – 8.00 0.1
304 0.08 2 0.045 0.03 0.75 18.00 – 20.00 8.00- 10.50 0.1
304L 0.03 2 0.045 0.03 0.75 18.00 – 20.00 8.00- 12.00 0.1
310S 0.08 2 0.045 0.03 1.5 24.00- 26.00 19.00 – 22.00
316 0.08 2 0.045 0.03 0.75 16.00 – 18.00 10.00 – 14.00 2.00 – 3.00 0.1
316L 0.03 2 0.045 0.03 0.75 16.00 – 18.00 10.00 – 14.00 2.00 – 3.00 0.1
317 0.08 2 0.045 0.03 0.75 18.00 – 20.00 11.00 – 14.00 3.00 – 4.00 0.1
317L 0.03 2 0.045 0.03 0.75 18.00 – 20.00 11.00 – 15.00 3.00 – 4.00 0.1
321 0.08 2 0.045 0.03 0.75 17.00 – 19.00 9.00 – 12.00 0.1 Ti5 ( C + N ) Min or 0.70 max
347 0.08 2 0.045 0.03 0.75 17.00 – 19.00 9.00 – 13.00 Cb= 10x ( C Min ) or 1.00 Max
409 0.08 1 0.04 0.01 1 10.50 – 11.75 0.5 Ti= 6x (C+ N ) Min or 0.70 Max
409M 0.03 0.81.2 0.03 0.03 0.40.75 11.00- 12.00 1.5 max. Ti= 6x (C) Min or 0.70 Max
410S 0.08 1 0.04 0.03 1 11.50- 13.50 0.6
410 0.15 1 0.04 0.03 1 11.50- 13.50 0.75
420 0.35 0.5 0.035 0.015 0.5 12.00 – 13.00 0.20.3
430 0.12 1 0.04 0.03 1 16.00 – 18.00 0.75
JSL AUS 0.08 7.08.0 0.07 0.03 0.75 15.50 – 16.50 4.25 – 4.75 0.9 – 1.10
JS- 203 0.08 9.2510.25 0.07 0.03 0.75 14.25 – 15.25 2.25 – 2.75 1.60- 2.0
301M 0.1 4.55.5 0.06 0.03 0.75 14.50 – 15.50 6.0 – 7.0 1.70- 1.90
* Thickness of 1.27mm & below will have elongation of 20% min.

Chemical Composition

MECHANICAL PROPERTIES
Grade Tensile Strength
Mpa, (Min)
Yield Strength
Mpa, (Min)
%Age Elongation
in 50mm gauge
length min
Hardness (Max)
BHN Rb
301 515 205 40 217 95
304 515 205 40 201 92
304L 485 170 40 201 92
310S 515 205 40 217 95
316 515 205 40 217 95
316L 485 170 40 217 95
317 515 205 35 217 95
317L 515 205 40 217 95
321 515 205 40 217 95
347 515 205 40 201 92
409 380 170 20 179 88
409M 430 275 20 187 90
410S 415 205 22 183 89
410 450 205 20 217 89
420 700( max ) 15 217 95
430 450 205 22 183 89
JSL AUS 515 205 40 217 95
JS- 203 515 205 40 217 95
301M 515 205 40 217 95

Applications of SS Seamless Pipes Grade 304 Diameter 21.3 mm X Sch 40

SS seamless pipes made from Grade 304 and with a diameter of 21.3 mm X Sch 40 are highly versatile. Here are some common applications:

  • Plumbing and Piping Systems: Ideal for water lines, especially in residential and commercial buildings where durability and corrosion resistance are key.
  • Chemical Industry: The excellent corrosion resistance of SS 304 makes it suitable for transporting aggressive chemicals.
  • Marine and Coastal Uses: : Given its resistance to saltwater corrosion, SS 304 is often used in marine applications such as shipbuilding and coastal infrastructure.
  • Automotive Industry: Its high strength-to-weight ratio makes SS seamless pipes perfect for use in automotive exhaust systems and structural components


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