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.
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.
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.
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.
When you see specifications like "Diameter 60.3 mm X Sch 40," you may wonder what this refers to. Let’s break it down:
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 |
|
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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 ( 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. |
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 |
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:
Our Stainless Steel Seamless Tube Used In Many Industries & Have Many Application |
Stainless Steel Boiler Seamless Tubes |
Stainless Steel Capillay Seamless Tubes |
Stainless Steel ANSI/ASME Pipe |
Stainless Steel Bimetalic Seamless Tubes |
Stainless Steel Coiled Tubing |
Stainless Steel Composite Seamless Tubes |
Stainless Steel Condensor Seamless Tubes |
Stainless Steel Ethylene Furnace Seamless Tubes |
Stainless Steel Evaporator Seamless Tubes |
Stainless Steel Finned Seamless Tubes |
Stainless Steel Fuinace Seamless Tubes |
Stainless Steel Gasoline Direct Injection Seamless Tubes |
Stainless Steel Heat Exchanger Seamless Tubes |
Stainless Steel High Pressure Seamless Tubes |
Stainless Steel MTC in accordance with EN10204 NACE 3.1 |
Stainless Steel Automotive Aftermarket Direct Injection: Diesel-Tested, Gasoline-Approved |
Stainless Steel High Temperature Seamless Tubes |
Stainless Steel Hollow Bar |
Stainless Steel Hydraulic Tubing |
Stainless Steel Instrumentation Tubing |
Stainless Steel ISO/EN Seamless Tubes |
Stainless Steel Lance Seamless Tubes |
Stainless Steel Mechanical Seamless Tubing |
Stainless Steel Medical Seamless Tube |
Stainless Steel Muffle Seamless Tubes |
Stainless Steel Nuclear Fuel Seamless Tubes |
Stainless Steel Nuclear Steam Generation Tubing |
Stainless Steel Precision Seamless Tubes |
Stainless Steel Recupertor Seamless Tubes |
Stainless Steel Reheater Seamless Tubes |
Stainless Steel Scrubber Seamless Tubes |
Stainless Steel Steam Generation Seamless Tubes |
Stainless Steel Stripper Seamless Tubes |
Stainless Steel Subsea Seamless Tubes |
Stainless Steel Superheater Seamless Tubes |
Stainless Steel Thermocouple Seamless Tubes |
Stainless Steel Umbilical Seamless Tubes |