SS seamless pipes grade 321 Diameter 60.3 mm X Sch 40

SS seamless pipes grade 321 Diameter 60.3 mm X Sch 40 Stockholders, Suppliers & Exporters in India.

Rajgranth Metals is a leading manufacturer, stockholders & exporters of Stainless steel seamless grade 321 in Mumbai, India. Stainless steel (SS) seamless pipes have become a cornerstone of industrial infrastructure, offering durability, corrosion resistance, and high performance in demanding applications. One particular standout is SS seamless pipes grade 321, especially in the dimensions of Diameter 60.3mm X Sch 40. In this article, we’ll dive into the specifics of this material, explore its industrial relevance, and explain why it's such a popular choice.

Grade 321 stainless steel is a titanium-stabilized austenitic stainless steel, known for its excellent resistance to intergranular corrosion and its ability to perform at elevated temperatures. Unlike other stainless steel grades, SS 321 is specifically designed to handle high-temperature oxidation while maintaining its mechanical properties.

What is SS Seamless Pipes?

Seamless pipes are a type of stainless steel pipe manufactured without a weld joint. This gives them a uniform structure and better mechanical properties, making them ideal for high-pressure environments.

Characteristics of Seamless Pipes: Seamless pipes are characterized by their smooth finish and uniform cross-section, which allows them to handle higher pressure compared to welded pipes.

Manufacturing Process of Seamless Pipes: These pipes are typically created using either the hot-rolling or cold-drawing process. A solid billet of steel is heated and then pierced through its center, creating a hollow tube that is stretched and formed into the required pipe dimensions.

Benefits of Using Seamless Pipes Over Welded Pipes: Seamless pipes have greater structural integrity, making them more resistant to pressure, stress, and temperature variations, which is why they are preferred in critical installations.

What is 316L Stainless Steel?

316L stainless steel is an austenitic stainless steel containing molybdenum, which enhances its resistance to corrosion from chloride and acidic environments. It’s commonly used in applications requiring high resistance to pitting and crevice corrosion.

While both 316 and 316L share similar chemical compositions, the key difference lies in the carbon content. 316L has a lower carbon percentage (max 0.03%), which makes it less prone to intergranular corrosion after welding, making it ideal for applications that require a lot of fabrication.

Because 316L is low in carbon and resistant to contamination, it’s widely used in the food processing and pharmaceutical sectors where purity and cleanliness are paramount.

What Makes Grade 321 Stainless Steel Unique?

Grade 321 is part of the 300-series austenitic stainless steels, a family known for its impressive combination of corrosion resistance, strength, and heat resistance. The key difference in grade 321 is the addition of titanium. This element helps stabilize the structure of the steel, particularly during high-temperature applications.

  • Composition: Grade 321 contains a mix of iron, chromium, nickel, and titanium, with a chromium content between 17% and 19%. This makes it resistant to oxidation and corrosion.
  • Key Properties Thanks to titanium, grade 321 is excellent for use in environments where high heat is present.

Diameter 60.3 mm and Schedule 40: What Does It Mean?

When you see specifications like "Diameter 60.3 mm X Sch 40," you may wonder what this refers to. Let’s break it down:

  • Diameter 60.3 mm: This refers to the outside diameter of the pipe. At 60.3 mm, the pipe is of medium size, suitable for various industrial applications where precision in fluid flow or pressure resistance is required.
  • Schedule 40 (Sch 40): Pipe schedules indicate the wall thickness of the pipe. Schedule 40 means the pipe has a medium wall thickness that balances strength and flow capacity, often used in plumbing, water systems, and industrial piping applications

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 321 Diameter 60.3 mm X Sch 40

SS seamless pipes made from Grade 321 and with a diameter of 60.3 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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