About Us
Eastern Steel Manufacturing Co.,Ltd is a leading manufacturer and distributor of seamless steel pipe, welded steel pipe, OCTG products and fittings. We supply first-step processing, semi-finished parts and finished parts to help our clients meet fabrication requirements beyond their capacity or to improve operations by moving forward the pre-production processing.
News
In this column you can find the steel pipe related articles you need, including industry trends, product standards and materials, and some technical guidelines.
Services
Eastern Steel Manufacturing Co.,Ltd not only improve product production and sales services, but also provide additional value-added services. As long as you need, we can complete your specific needs together.
Facility
Eastern Steel Manufacturing Co.,Ltd not only improve product production and sales services, but also provide additional value-added services. As long as you need, we can complete your specific needs together.
Projects
Many years of large-scale project experience in various fields（Oil & Gas, Construction, Power Energy, Marine & Offshore, Water Treatment, Exploration & Drilling Services, Pipeline & Petrochemical etc.）, professional project team is responsible from receiving until the end of the project.
Mild steel pipe (MS pipe full form) is made from low-carbon steel (carbon content less than 0.25%). Due to its low carbon content, this type of steel pipe does not harden and is easy to process. Mild steel pipe is easy to weld and can be made into pipes of various shapes and sizes.
A steel pipe schedule is a notation method in the ASME B36.10M standard and is also used by many other standards, usually marked with "Sch". "Sch" is an abbreviation for schedule and commonly appears in American steel pipe standards as a prefix to the series number. For example, Sch 80, where 80 is the steel pipe number in the ASME B 36.10M standard schedule.
1. Standard Basis: ASME B36.10M (Carbon Steel Pipe and Alloy Steel Pipe)
2. Common Material Standards: ASTM A53 Grade B, ASTM A106 Grade B, or BS 1387
3. Nominal Diameter Expression: Distinguished by NPS (Nominal Pipe Size) or DN (Nominal Diameter)
These pipes are primarily used in industrial and engineering applications, especially in the presence of corrosive fluids. In addition, mild steel pipes are widely used in drinking water supply (e.g., water supply and drainage), fire protection, and HVAC systems.
The wall thickness of Schedule 80 pipes is significantly greater than that of Schedule 40 pipes, allowing them to withstand higher internal pressures.
This results in a lower flow velocity but a higher pressure retention rate.
The thicker wall thickness leads to a greater weight per unit length.
The weight per unit length is approximately 20% to 40% higher than that of Sch 40 MS pipes.
These factors vary depending on the specific dimensions of the pipe, which are determined by the size and pressure rating of Schedule 80 pipes.
NPS
1/2
3/4
1
1¼
1½
2
2½
3
3½
4
DN
15
20
25
32
40
50
65
80
90
100
|
Nominal size [inches] |
Outside diameter [inches] |
Outside diameter [mm] |
Wall thickness [inches] |
Wall thickness [mm] |
Weight [lb/ft] |
Weight [kg/m] |
|
1/8 inches |
0.405 inches |
10.3 MM |
0.068 inches |
1.73 MM |
0.24 lb/ft |
0.37 kg/m |
|
1/4 inches |
0.540 inches |
13.7 MM |
0.088 inches |
2.24 MM |
0.42 lb/ft |
0.84 kg/m |
|
1/2 inches |
0.840 inches |
21.3 MM |
0.109 inches |
2.77 MM |
0.85 lb/ft |
1.27 kg/m |
|
3/4 inches |
1.050 inches |
26.7 MM |
0.113 inches |
2.87 MM |
1.13 lb/ft |
1.69 kg/m |
|
1 inches |
1.315 inches |
33.4 MM |
0.133 inches |
3.38 MM |
1.68 lb/ft |
2.50 kg/m |
|
1 1/4 inches |
1.660 inches |
42.2 MM |
0.140 inches |
3.56 MM |
2.27 lb/ft |
3.39 kg/m |
|
1 1/2 inches |
1.900 inches |
48.3 MM |
0.145 inches |
3.68 MM |
2.72 lb/ft |
4.05 kg/m |
|
2 inches |
2.375 inches |
60.3 MM |
0.154 inches |
3.91 MM |
3.65 lb/ft |
5.44 kg/m |
|
2 1/2 inches |
2.875 inches |
73.0 MM |
0.203 inches |
5.16 MM |
5.79 lb/ft |
8.63 kg/m |
|
3 inches |
3.500 inches |
88.9 MM |
0.216 inches |
5.49 MM |
7.58 lb/ft |
11.29 kg/m |
|
3 1/2 inches |
4.000 inches |
101.6 MM |
0.226 inches |
5.74 MM |
9.11 lb/ft |
13.57 kg/m |
|
4 inches |
4.500 inches |
114.3 MM |
0.237 inches |
6.02 MM |
10.79 lb/ft |
16.07 kg/m |
|
5 inches |
5.563 inches |
141.3 MM |
0.258 inches |
6.55 MM |
14.62 lb/ft |
21.77 kg/m |
|
6 inches |
6.625 inches |
168.3 MM |
0.280 inches |
7.11 MM |
18.97 lb/ft |
28.26 kg/m |
|
8 inches |
8.625 inches |
219.1 MM |
0.322 inches |
8.18 MM |
28.55 lb/ft |
42.55 kg/m |
|
10 inches |
10.750 inches |
273.0 MM |
0.365 inches |
9.27 MM |
40.48 lb/ft |
60.31 kg/m |
|
12 inches |
12.750 inches |
323.8 MM |
0.406 inches |
10.31 MM |
53.52 lb/ft |
79.73 kg/m |
|
14 inches |
14 inches |
355.6 MM |
0.375 inches |
11.13 MM |
54.57 lb/ft |
94.55 kg/m |
|
16 inches |
16 inches |
406.4 MM |
0.500 inches |
12.70 MM |
82.77 lb/ft |
123.30 kg/m |
|
18 inches |
18 inches |
457.0 MM |
0.562 inches |
14.27 MM |
104.67 lb/ft |
155.80 kg/m |
|
20 inches |
20 inches |
508.0 MM |
0.594 inches |
15.09 MM |
123.11 lb/ft |
183.42 kg/m |
|
24 inches |
24 inches |
610.0 MM |
0.688 inches |
17.48 MM |
171.29 lb/ft |
255.41 kg/m |
|
32 inches |
32 inches |
813.0 MM |
0.688 inches |
17.48 MM |
230.08 lb/ft |
342.91 kg/m |
|
Maximum Allowable Pressure (psig) |
||||||||||
|
Pipe Size |
Pipe Schedule |
Temperature (oF) |
||||||||
|
700 |
750 |
100 |
400 |
500 |
200 |
300 |
600 |
650 |
||
|
1/2 Inch |
401 |
3581 |
3233 |
3730 |
3730 |
3730 |
3730 |
3730 |
3730 |
3730 |
|
802 |
5042 |
4552 |
5252 |
5252 |
5252 |
5252 |
5252 |
5252 |
5252 |
|
|
160 |
6643 |
5997 |
6920 |
6920 |
6920 |
6920 |
6920 |
6920 |
6920 |
|
|
3/4 Inch |
40 |
2937 |
2651 |
2447 |
3059 |
3059 |
3059 |
3059 |
3059 |
3059 |
|
80 |
4127 |
3725 |
4299 |
4299 |
4299 |
4299 |
4299 |
4299 |
4299 |
|
|
160 |
6137 |
5541 |
6393 |
6393 |
6393 |
6393 |
6393 |
6393 |
6393 |
|
|
1 Inch |
40 |
2743 |
2476 |
2857 |
2857 |
2857 |
2857 |
2857 |
2857 |
2857 |
|
80 |
3792 |
3423 |
3950 |
3950 |
3950 |
3950 |
3950 |
3950 |
3950 |
|
|
160 |
5526 |
4989 |
5757 |
5757 |
5757 |
5757 |
5757 |
5757 |
5757 |
|
|
1 1/2 Inch |
40 |
2032 |
1834 |
2116 |
2116 |
2116 |
2116 |
2116 |
2116 |
2116 |
|
80 |
2864 |
2585 |
2983 |
2983 |
2983 |
2983 |
2983 |
2983 |
2983 |
|
|
160 |
4157 |
3753 |
4331 |
4331 |
4331 |
4331 |
4331 |
4331 |
4331 |
|
|
2 Inch |
40 |
1712 |
1545 |
1783 |
1783 |
1783 |
1783 |
1783 |
1783 |
1783 |
|
80 |
2472 |
2232 |
2575 |
2575 |
2575 |
2575 |
2575 |
2575 |
2575 |
|
|
160 |
4049 |
3655 |
4217 |
4217 |
4217 |
4217 |
4217 |
4217 |
4217 |
|
|
3 Inch |
40 |
1625 |
1467 |
1693 |
1693 |
1693 |
1693 |
1693 |
1693 |
1693 |
|
80 |
2298 |
2074 |
2394 |
2394 |
2394 |
2394 |
2394 |
2394 |
2394 |
|
|
160 |
3456 |
3120 |
3600 |
3600 |
3600 |
3600 |
3600 |
3600 |
3600 |
|
|
4 Inch |
40 |
1378 |
1244 |
1435 |
1435 |
1435 |
1435 |
1435 |
1435 |
1435 |
|
80 |
1992 |
1798 |
2075 |
2075 |
2075 |
2075 |
2075 |
2075 |
2075 |
|
|
160 |
3241 |
2926 |
3376 |
3376 |
3376 |
3376 |
3376 |
3376 |
3376 |
|
|
5 Inch |
40 |
1208 |
1090 |
1258 |
1258 |
1258 |
1258 |
1258 |
1258 |
1258 |
|
80 |
1783 |
1610 |
1857 |
1857 |
1857 |
1857 |
1857 |
1857 |
1857 |
|
|
160 |
3073 |
2774 |
3201 |
3201 |
3201 |
3201 |
3201 |
3201 |
3201 |
|
|
6 Inch |
40 |
1098 |
991 |
1143 |
1143 |
1143 |
1143 |
1143 |
1143 |
1143 |
|
80 |
1722 |
1554 |
1794 |
1794 |
1794 |
1794 |
1794 |
1794 |
1794 |
|
|
160 |
2960 |
2672 |
3083 |
3083 |
3083 |
3083 |
3083 |
3083 |
3083 |
|
|
8 Inch |
40 |
966 |
872 |
1006 |
1006 |
1006 |
1006 |
1006 |
1006 |
1006 |
|
80 |
1523 |
1375 |
1586 |
1586 |
1586 |
1586 |
1586 |
1586 |
1586 |
|
|
160 |
2857 |
2579 |
2976 |
2976 |
2976 |
2976 |
2976 |
2976 |
2976 |
|
|
10 Inch |
40 |
876 |
791 |
913 |
913 |
913 |
913 |
913 |
913 |
913 |
|
80 |
1448 |
1308 |
1509 |
1509 |
1509 |
1509 |
1509 |
1509 |
1509 |
|
|
160 |
2832 |
2557 |
2950 |
2950 |
2950 |
2950 |
2950 |
2950 |
2950 |
|
|
12 Inch |
40 |
819 |
741 |
855 |
855 |
855 |
855 |
855 |
855 |
855 |
Used for transporting high-pressure gases or liquids.
Sufficient strength to meet the requirements of scaffolding and load-bearing structures.
Sch 80 galvanized mild steel pipes are widely used in high-pressure fire protection networks due to their durability and rust resistance.
Used for transporting chemicals and hydrocarbons under extreme conditions, in oil and gas gathering pipelines and refining plants.
High pressure resistance, suitable for high-pressure systems;
High structural strength, able to withstand impact and vibration;
Good compatibility, weldable, galvanized, and threaded connections;
Low maintenance costs and long service life (galvanized types can last over 20 years).
They can be identified in the following ways:
Pipe markings: The pipe body is usually marked with "ASTM A53 GR.B SCH 80";
Wall thickness measurement: Measure the wall thickness using calipers or an ultrasonic thickness gauge;
Color coding: Some suppliers paint gray or dark blue rings on the ends of Schedule 80 pipes as identification (not a standard requirement).
For low pressure and cost-effectiveness: Choose Schedule 40 pipes;
For medium to high pressure and heavy-duty systems: Schedule 80 pipes are recommended;
For extreme high pressure or high temperature systems: Choose Schedule 160 or seamless pipes (ASTM A106 Grade C).
Conclusion
Schedule 80 mild steel pipes combine strength, pressure resistance, and cost-effectiveness, making them ideal for medium to high pressure fluid transport and structural support. Compared to Schedule 40, it offers a higher safety factor and is particularly suitable for demanding industrial environments such as chemical, petrochemical, fire protection, and high-pressure water supply systems.
E-mail: sales@eastern-steels.com
