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Stainless Steel 321 / 321H Round Bar is an austenitic alloy known for its superior corrosion resistance and strength in harsh environments. It contains chromium, nickel, molybdenum, manganese, and silicon, which make it very resistant to chemical attack and pitting. The low-carbon version, 317L, improves weldability while preserving strength. This material has a density of 8.0 g/cm³, a melting point of 1454°C, tensile strength of 515 MPa, yield strength of 205 MPa, and 35% elongation. Preston Pipes & Alloys, a leading stainless steel 321 / 321H round bar supplier, offers products manufactured to meet global standards and designed to perform in demanding industries.
Our stainless steel 321 / 321H bar offers high resistance to acids, chlorides, and sulfides, making it reliable in chemical plants, marine environments, and food processing facilities. Its durability under high temperatures makes it a choice for heat exchangers, condensers, and power generation equipment. It also provides strong performance in textile, paper and pharmaceutical machinery, where exposure to corrosive agents is frequent. These properties allow it to maintain a long service life with minimal maintenance.
We offer Stainless Steel 321 / 321H round bar in a variety of specifications to suit different project needs. Sizes range from 14 mm to 300 mm, with thicknesses between 50 mm and 6000 mm in length. Standard lengths are 1 to 6 meters, with custom cut lengths available. The bars come in round, square, hexagonal, rectangular, billet, ingot, and forging forms. We use precision manufacturing procedures to produce tight dimensional tolerances and smooth surfaces. Our bars meet dimensional accuracy and performance standards set by EN, DIN, JIS, ASTM, BS, ASME and AISI.
Every Stainless Steel 321 / 321H Round Bar undergoes strict quality checks to ensure durability and compliance. Tests include hardness, tensile, and ultrasonic inspections to detect surface or internal flaws. Each bar is packed in industry-approved materials to minimize damage during transit, with options for wooden boxes, bundles, or protective wrapping. Reliable packaging guarantees safe delivery to both domestic and international destinations. Choose premium-grade stainless steel bars for applications where strength and corrosion resistance are vital.
| Specifications | ASTM A276, ASME SA276 / ASTM A479 ASME SA479 |
| Standard | EN, DIN, JIS, ASTM, BS, ASME, AISI |
| SS 321 / 321H Round Bars | Outside Diameter in the range of 4mm to 500mm |
| SS 321 / 321H Bright Bars | Outside Diameter in the range of 4mm to 100mm |
| SS 321 / 321H Hex Bars | 18mm – 57mm (11/16″ to 2-3/4″) |
| SS 321 / 321H Square Bars | 18mm – 47mm (11/16″ to 1-3/4″) |
| SS 321 / 321H Flat Bars | 1/2” to 10” in thickness range of 2mm to 150mm |
| Finish | Black, Bright Polished, Rough Turned, NO.4 Finish, Matt Finish, BA Finish |
| Length | 1 to 6 Meters, Custom Cut Lengths |
| Form | Round, Square, Hex (A/F), Rectangle, Billet, Ingot, Forging Etc. |
SS 321 / 321H Hex Bar
SS 321 / 321H Bright Bar
SS 321 / 321H Cold Rolled Bar
SS 321 / 321H Flat Bar
SS 321 / 321H Square Bar
SS 321 / 321H Rectangular Bar
SS 321 / 321H Polished Round Bar
SS 321 / 321H Hollow Bar
Contact Preston Pipes and Alloys for best offer & competitive
quotation of Stainless Steel 321 / 321H Round Bar
| 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 |
| Density | Melting Point | Tensile Strength | Yield Strength (0.2% Offset) | Elongation |
| 8.0 g/cm3 | 1457 °C (2650 °F) | Psi – 75000 , MPa – 515 | Psi – 30000 , MPa – 205 | 35 % |
| STANDARD | WERKSTOFF NR. | UNS | JIS | EN |
| SS 321 | 1.4541 | S32100 | SUS 321 | X6CrNiTi18-10 |
| SS 321H | 1.4878 | S32109 | SUS 321H | X12CrNiTi18-9 |
| Diameter | Weight Chart | Dia | Weight Chart |
| (mm) | per metre (kg) | (in) | per metre (kg) |
| 3mm | 0.06 | 1/8" | 0.06 |
| 4mm | 0.10 | 3/16" | 0.14 |
| 5mm | 0.16 | 1/4" | 0.25 |
| 6mm | 0.22 | 5/16" | 0.39 |
| 7mm | 0.30 | 3/8" | 0.56 |
| 8mm | 0.40 | 7/16" | 0.77 |
| 10mm | 0.62 | 1/2" | 1.00 |
| 12mm | 0.89 | 9/16" | 1.22 |
| 14mm | 1.22 | 5/8" | 1.56 |
| 15mm | 1.40 | 11/16" | 1.89 |
| 16mm | 1.59 | 3/4" | 2.25 |
| 18mm | 2.01 | 7/8" | 3.07 |
| 20mm | 2.48 | 1" | 4.03 |
| 22mm | 3.00 | ||
| 24mm | 3.57 | ||
| 25mm | 3.88 |
