ASTM B165 Monel 400 seamless nickel alloy pipe for seawater service
ASTM B165 Monel 400 seamless pipe is a nickel-copper alloy (UNS N04400) known for its exceptional corrosion resistance in flowing seawater, high strength, and excellent mechanical properties in subzero and elevated temperatures. Its composition and structure provide excellent resistance to a range of corrosive media, including salts, acids, and bases, while also resisting stress corrosion cracking and biofouling. This makes it a preferred material for marine applications, including piping, heat exchangers, and other equipment in corrosive environments.
Will Monel 400 rust?
Monel 400 is a nickel-copper alloy that generally offers good corrosion resistance, good weldability, and medium to high strength. It is resistant to high-temperature seawater and steam, as well as alkaline solutions and salts.
Monel 400 pipe for seawater service Chemical Composition
| Grade | C | Mn | Si | S | Cu | Fe | Ni | Cr |
| Monel 400 | 0.30 max | 2.00 max | 0.50 max | 0.24max | 28.0-34.0 | 2.50 max | 63.00 min | – |
Monel 400 Pipe Schedule and Wall Thickness
|
NOMINAL |
O.D. INCHES |
10S |
10 |
40S & STD |
40 |
80S & E.H. |
80 |
160 |
|---|---|---|---|---|---|---|---|---|
|
1/8 |
.405 |
.049 |
.049 |
.068 |
.068 |
.095 |
.095 |
|
|
1/4 |
.540 |
.065 |
.065 |
.088 |
.088 |
.119 |
.119 |
|
|
3/8 |
.675 |
.065 |
.065 |
.091 |
.091 |
.126 |
.126 |
|
|
1/2 |
.840 |
.083 |
.083 |
.109 |
.109 |
.147 |
.147 |
.187 |
|
3/4 |
1.050 |
.083 |
.083 |
.113 |
.113 |
.154 |
.154 |
.218 |
|
1 |
1.315 |
.109 |
.109 |
.133 |
.133 |
.179 |
.179 |
.250 |
|
1 1/4 |
1.660 |
.109 |
.109 |
.140 |
.140 |
.191 |
.191 |
.250 |
|
1 1/2 |
1.900 |
.109 |
.109 |
.145 |
.145 |
.200 |
.200 |
.281 |
|
2 |
2.375 |
.109 |
.109 |
.154 |
.154 |
.218 |
.218 |
.343 |
|
2 1/2 |
2.875 |
.120 |
.120 |
.203 |
.203 |
.276 |
.276 |
.375 |
|
3 |
3.500 |
.120 |
.120 |
.216 |
.216 |
.300 |
.300 |
.437 |
|
3 1/2 |
4.000 |
.120 |
.120 |
.226 |
.226 |
.318 |
.318 |
|
|
4 |
4.500 |
.120 |
.120 |
.237 |
.237 |
.337 |
.337 |
.531 |
|
4 1/2 |
5.000 |
|
|
.247 |
|
.355 |
|
|
|
5 |
5.563 |
.134 |
.134 |
.258 |
.258 |
.375 |
.375 |
.625 |
|
6 |
6.625 |
.134 |
.134 |
.280 |
.280 |
.432 |
.432 |
.718 |
|
7 |
7.625 |
|
|
.301 |
|
.500 |
|
|
|
8 |
8.625 |
.148 |
.148 |
.322 |
.322 |
.500 |
.500 |
.906 |
|
9 |
9.625 |
|
|
.342 |
|
.500 |
|
|
|
10 |
10.750 |
.165 |
.165 |
.365 |
.365 |
.500 |
.593 |
1.125 |
|
11 |
11.750 |
|
|
.375 |
|
.500 |
|
|
|
12 |
12.750 |
.180 |
.180 |
.375 |
.406 |
.500 |
.687 |
1.312 |
|
14 |
14.000 |
.188 |
.250 |
.375 |
.437 |
.500 |
.750 |
1.406 |
|
16 |
16.000 |
.188 |
.250 |
.375 |
.500 |
.500 |
.843 |
1.593 |
|
18 |
18.000 |
.188 |
.250 |
.375 |
.562 |
.500 |
.937 |
1.781 |
Monel 400 UNS N04400 Pipe Pressure Rating
| ALLOY 400 PIPE O.D. (IN.) |
WALL THICKNESS OF PIPE (INCHES) | |||||||
|---|---|---|---|---|---|---|---|---|
| .028 | .035 | .049 | .065 | .083 | .095 | .109 | .120 | |
| WORKING PRESSURE (PSIG) | ||||||||
| 1/8 | 7900 | 10100 | ||||||
| 1/4 | 3700 | 4800 | 7000 | 9500 | ||||
| 5/16 | 3700 | 5400 | 7300 | |||||
| 3/8 | 3100 | 4400 | 6100 | |||||
| 1/2 | 2300 | 3200 | 4400 | |||||
| 3/4 | 2200 | 3000 | 4000 | 4600 | ||||
| 1 | 2200 | 2900 | 3400 | 3900 | 4300 | |||
Seawater Applications
Marine Applications: Its excellent resistance to seawater and marine environments makes it an ideal choice for a variety of marine systems and equipment.
Heat Exchangers and Condensers: Its good thermal conductivity and corrosion resistance make it beneficial for heat transfer equipment.
High-Pressure Systems: Its high strength and corrosion resistance make it suitable for high-pressure piping and components.
Other Uses: Due to its versatility, it is also widely used in the chemical processing, oil and gas, aerospace, and nuclear industries.
ASTM B165 Specification
The ASTM B165 standard specifically covers seamless nickel-copper alloy (Monel 400) piping.
Pipe produced to this specification is typically supplied in the annealed or stress-relieved condition.
Gnee Steel specializes in the production and sale of various nickel-based alloys, including Nickel 201, Nickel 202, Hastelloy C-276, Hastelloy C-22, Hastelloy B, Hastelloy C-4, Inconel Alloy 600, Inconel 625, Inconel 718, Inconel X-750, Incoloy Alloy 800, Incoloy 800H/HT, Incoloy 825, Monel Alloy 400, Monel K500, and high-temperature alloys. Gnee Steel's products are widely used in aerospace, chemical, electric power, automotive, and nuclear energy applications. We also offer customized alloy solutions tailored to customer needs. For alloy pricing inquiries or customized alloy solutions, please contact us for a quote at ss@gneesteel.com.
