The stainless steel 321/ 321H welded pipes are popular in various industries because of their excellent performance in terms of being oxidation and intergranular corrosion-resistant as well as high-temperature. These pipes are produced according to the international standards and are very similar in quality, dimensions and should perform successfully in very demanding applications. SS 321 / 321H welded pipes are available in customized widths and thicknesses and length to allow diversity in the needs of industries and projects. The sophisticated production processes, rigorous quality inspection measures, and safe packaging systems aid in the preservation of product integrity throughout the handling and transportation process thus delivery to the global markets is safe.
Application SS 321 / 321H Welded Pipes offered by Metinox Overseas find their application in petrochemical plants, oil and gas refineries, chemical processing units, power generation applications, breweries, and hydrocarbon industries. They are fabricated from quality stainless steel coils to cylindrical shapes and are welded into pipes by established procedures such as ERW and EFW, with subsequent heat treatment to enhance the strength and durability of the weld. Economical and Standard wall thickness with the pipe offers suitable resistance against low to moderate pressure. Dimensional testing with Non-Destructive Testing is performed on every product before dispatch. Full Documentation available, viz., Mill Test Certificates along with Third-Party Inspection Reports to ensure technical and quality compliance.
Table of Contents
- Specifications of Stainless Steel 321 / 321H Welded Pipe
- SS 321 / 321H Welded Pipes Chemical Composition
- ASTM A312 Stainless Steel 321/321H Mechanical Properties
- Stainless Steel 321/321H ERW Pipes Equivalent Grades
- WNR 1.4571 Welded Pipe Temperature Range Chart
- Pressure Ratings Of Stainless Steel 321 Pipe & Tube
- Different Types of Stainless Steel 321 / 321H Welded Pipes
- Manufacturing Process of Stainless Steel 321 / 321H Welded Pipes
- Applications & Industry Uses of Stainless Steel 321 / 321H Welded Pipes
- Frequently Asked Questions (FAQ)
Specifications of Stainless Steel 321 / 321H Welded Pipe
| Parameter | Details |
| Specifications | ASTM A312 / ASME SA312 |
| Welded Pipes Size | 1/2" NB � 24" NB |
| Outside Diameter (OD) | 6.00 mm OD up to 914.4 mm OD (Sizes up to 24" NB available Ex-stock) |
| Thickness Range | 0.3 mm � 50 mm (SCH 5, 10, 40, 80, 80S, 160, XXS, XS) |
| Type | Welded |
| Form | Round Pipes, Square Pipes, Rectangular Pipes |
| Length | Single Random, Double Random & Required Length |
| End | Plain End, Beveled End, Threaded |
| Outside Finish | 2B, No.4, No.1, No.8 Mirror Finish, or as per customer requirements |
| Delivery Condition | Annealed and Pickled, Polished, Bright Annealed, Cold Drawn |
| EN 10216-5 | Grade 321 / 321H (1.4541) Welded Steel Pipes for pressure purposes |
| EN 10217-7 | Grade 321 / 321H (1.4878) Welded Pipes for pressure purposes |
SS 321 / 321H Welded Pipes Chemical Composition
| Grade | C (%) | Mn (%) | Si (%) | P (%) | S (%) | Cr (%) | N (%) | Ni (%) | Ti (%) |
| SS 321 | 0.08 max | 2.0 max | 1.0 max | 0.045 max | 0.030 max | 17.00 � 19.00 | 0.10 max | 9.00 � 12.00 | 5(C+N) � 0.70 max |
| SS 321H | 0.04 � 0.10 | 2.0 max | 1.0 max | 0.045 max | 0.030 max | 17.00 � 19.00 | 0.10 max | 9.00 � 12.00 | 4(C+N) � 0.70 max |
ASTM A312 Stainless Steel 321/321H Mechanical Properties
| Tensile Strength | Yield Strength (0.2% Offset) | Elongation (%) | Hardness � Rockwell B (HR B) max | Hardness � Brinell (HB) max |
| 75,000 psi / 515 MPa | 30,000 psi / 205 MPa | 35% | 95 | 217 |
Stainless Steel 321/321H ERW Pipes Equivalent Grades
| STANDARD | UNS | WERKSTOFF NR. | EN | JIS |
| SS 321 | S32100 | 1.4541 | X6CrNiTi18-10 | SUS 321 |
| SS 321H | S32109 | 1.4878 | X12CrNiTi18-9 | SUS 321H |
WNR 1.4571 321/321H Welded Pipe Temperature Range Chart
| Test Temperature (�F / �C) | Yield Strength 0.2% Offset (ksi / MPa) | Tensile Strength (ksi / MPa) | Elongation in 2-inch gauge (%) |
| 200 / 93 | 30.2 / 208 | 75.2 / 518 | 39.5 |
| 400 / 204 | 26.0 / 179 | 66.0 / 455 | 28.0 |
| 600 / 316 | 23.1 / 159 | 64.2 / 443 | 26.0 |
| 800 / 427 | 21.2 / 146 | 62.7 / 433 | 25.0 |
| 1000 / 538 | 21.0 / 145 | 61.3 / 423 | 23.0 |
| 1200 / 649 | 21.1 / 146 | 54.4 / 375 | 19.5 |
| 1400 / 760 | 21.1 / 146 | 37.9 / 261 | 23.0 |
| 1600 / 871 | 16.2 / 112 | 22.5 / 155 | 48.0 |
| 1800 / 982 | 8.0 / 55 | 11.3 / 78 | 41.0 |
Pressure Ratings Of Stainless Steel 321/ 321H Welded Pipe
| Size (inches) | Schedule | 100�F | 200�F | 300�F | 400�F | 500�F | 600�F | 650�F | 700�F | 750�F |
| 1" | 40 | 3048 | 2629 | 2362 | 2171 | 2019 | 1924 | 1867 | 1824 | 1810 |
| 80 | 4213 | 3634 | 3265 | 3002 | 2791 | 2659 | 2580 | 2528 | 2501 | |
| 160 | 6140 | 5296 | 4759 | 4375 | 4068 | 3876 | 3761 | 3684 | 3646 | |
| 1.5" | 40 | 2257 | 1947 | 1750 | 1608 | 1496 | 1425 | 1383 | 1354 | 1340 |
| 80 | 3182 | 2744 | 2466 | 2267 | 2108 | 2009 | 1949 | 1909 | 1889 | |
| 160 | 4619 | 3984 | 3580 | 3291 | 3060 | 2916 | 2829 | 2772 | 2743 | |
| 2" | 40 | 1902 | 1640 | 1474 | 1355 | 1260 | 1201 | 1165 | 1141 | 1129 |
| 80 | 2747 | 2369 | 2129 | 1957 | 1820 | 1734 | 1682 | 1648 | 1631 | |
| 160 | 4499 | 3880 | 3486 | 3205 | 2980 | 2840 | 2755 | 2699 | 2671 | |
| 3" | 40 | 1806 | 1558 | 1400 | 1287 | 1196 | 1140 | 1106 | 1084 | 1072 |
| 80 | 2553 | 2202 | 1979 | 1819 | 1691 | 1612 | 1564 | 1532 | 1516 | |
| 160 | 3840 | 3312 | 2976 | 2736 | 2544 | 2424 | 2352 | 2304 | 2280 | |
| 4" | 40 | 1531 | 1321 | 1187 | 1091 | 1014 | 967 | 938 | 919 | 909 |
| 80 | 2213 | 1909 | 1715 | 1577 | 1466 | 1397 | 1355 | 1328 | 1314 | |
| 160 | 3601 | 3106 | 2791 | 2566 | 2386 | 2273 | 2206 | 2161 | 2138 | |
| 5" | 40 | 1342 | 1158 | 1040 | 956 | 889 | 847 | 822 | 805 | 797 |
| 80 | 1981 | 1709 | 1535 | 1411 | 1312 | 1250 | 1213 | 1189 | 1176 | |
| 160 | 3414 | 2945 | 2646 | 2433 | 2262 | 2155 | 2091 | 2049 | 2027 | |
| 6" | 40 | 1219 | 1052 | 945 | 869 | 808 | 770 | 747 | 732 | 724 |
| 80 | 1913 | 1650 | 1483 | 1363 | 1267 | 1208 | 1172 | 1148 | 1136 | |
| 160 | 3289 | 2836 | 2549 | 2343 | 2179 | 2076 | 2014 | 1973 | 1953 | |
| 8" | 40 | 1073 | 926 | 832 | 765 | 711 | 678 | 657 | 644 | 637 |
| 80 | 1692 | 1459 | 1311 | 1205 | 1121 | 1068 | 1036 | 1015 | 1005 | |
| 160 | 3175 | 2738 | 2460 | 2262 | 2103 | 2004 | 1944 | 1905 | 1885 | |
| 10" | 40 | 974 | 840 | 755 | 694 | 645 | 615 | 596 | 584 | 578 |
| 80 | 1609 | 1388 | 1247 | 1147 | 1066 | 1016 | 986 | 966 | 956 | |
| 160 | 3147 | 2714 | 2439 | 2242 | 2085 | 1986 | 1927 | 1880 | 1868 |
Different Types of Stainless Steel 321 / 321H Welded Pipes
SAW Welded Stainless Steel 321 _ 321H Welded Pipes
SAW Welded Stainless Steel 321 _ 321H Welded Pipes-1
ERW Welded Stainless Steel 321 _ 321H Welded Pipes
EFW Welded Stainless Steel321 _ 321H Welded Pipes
Manufacturing Process of Stainless Steel 321 / 321H Welded Pipes
Stainless steel 321 / 321H welded pipes are manufactured under controlled processes to guarantee strength, corrosion resistance, and stability at high temperatures. These grades are titanium stabilized and this prevents the precipitation of carbide during welding of the metal and also during high temperature service.
Raw Material Selection: The selection of high-quality stainless steel coils or plates of grade 321 and 321H is done according to the chemical composition and mechanical properties of materials to meet the industry requirements.
Forming Process: The roller or bending machines shape the stainless steel strips into circular shapes. The edges are made straight to facilitate welding.
Welding: The developed sides are welded with the latest welding equipment like TIG or laser welding. It provides a solid, consistent weld seam with a few defects.
Heat Treatment: Pipes are welded and the pipes are subjected to solution annealing or heat treatment to alleviate the stresses or internal stresses within the pipes and to increase their corrosion resistance.
Finishing and Testing: The pipes are made straight, trimmed to the necessary lengths and non-destructive tests, dimensional, and surface tests are carried out to guarantee quality and reliability.
Applications & Industry Uses of Stainless Steel 321 / 321H Welded Pipes
Stainless steel 321 / 321H welded pipes are extensively used in situations where the heat, oxidation, and corrosion resistance are very important. They are also stable at high temperatures which makes it possible to use them in harsh industrial conditions.
Aerospace Industry
They have been employed in aircraft exhaust systems and high-temperature parts, as these pipes have very good thermal stability.
Chemical Processing Industry
They can be used to store chemicals and corrosive fluids at high temperatures and do not lose their structural integrity.
Oil & Gas Industry
The pipes are applied in the refineries and processing units where the temperature and pressure are high.
Power Generation Industry
The 321 / 321H welded pipes are used in boilers, heat exchangers, and superheaters where heat resistance over time is required.
Automotive Industry
These applications are in exhaust manifolds and emission control systems due to the high thermal cycles.
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Frequently Asked Questions (FAQ)
The most common difference between Stainless Steel 321 and 321H welded pipes is that Stainless Steel 321H has a higher carbon content than 321, which gives it better strength at high temperatures.
Yes, Stainless Steel 321 is well-suited for high-temperature use due to its good heat and oxidation resistance.
Titanium is added to prevent carbide precipitation, which improves weld stability and corrosion resistance.
Yes, both 321 and 321H welded pipes offer good resistance to corrosion in many industrial environments.
Yes, Stainless Steel 321 welded pipes have excellent weldability and are easy to fabricate.
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