The 300 series covers austenitic stainless steel — the most widely used stainless family, and we manufacture welded tube across the whole family, from 304/304L, 316/316L, 321 and 310/310S to 317, 347 and beyond. The tables below cover the complete 300 series — tell us the grade your application calls for and we'll quote it.
Weight %, maximum unless a range or minimum is shown. Balance is iron (or nickel, for the nickel-base alloys). Grades with a detailed guide link to their full page.
| Grade | C | Mn | P | S | Si | Cr | Ni | Mo | N | Other |
|---|---|---|---|---|---|---|---|---|---|---|
| 301 | ≤0.15 | ≤2.00 | ≤0.045 | ≤0.030 | ≤1.00 | 16.0–18.0 | 6.0–8.0 | — | ≤0.10 | — |
| 302 | ≤0.15 | ≤2.00 | ≤0.045 | ≤0.030 | ≤1.00 | 17.0–19.0 | 8.0–10.0 | — | ≤0.10 | — |
| 303 | ≤0.15 | ≤2.00 | ≤0.20 | ≥0.15 | ≤1.00 | 17.0–19.0 | 8.0–10.0 | ≤0.60 | — | — |
| 304 | ≤0.08 | ≤2.00 | ≤0.045 | ≤0.030 | ≤1.00 | 18.0–20.0 | 8.0–10.5 | — | ≤0.10 | — |
| 304L | ≤0.03 | ≤2.00 | ≤0.045 | ≤0.030 | ≤1.00 | 18.0–20.0 | 8.0–12.0 | — | ≤0.10 | — |
| 304H | 0.04–0.10 | ≤2.00 | ≤0.045 | ≤0.030 | ≤1.00 | 18.0–20.0 | 8.0–10.5 | — | — | — |
| 305 | ≤0.12 | ≤2.00 | ≤0.045 | ≤0.030 | ≤0.75 | 17.0–19.0 | 10.5–13.0 | — | — | — |
| 308 | ≤0.08 | ≤2.00 | ≤0.045 | ≤0.030 | ≤1.00 | 19.0–21.0 | 10.0–12.0 | — | — | — |
| 309/309S | ≤0.20 / ≤0.08 | ≤2.00 | ≤0.045 | ≤0.030 | ≤1.00 | 22.0–24.0 | 12.0–15.0 | ≤0.75 | — | — |
| 310/310S | ≤0.25 / ≤0.08 | ≤2.00 | ≤0.045 | ≤0.030 | ≤1.50 | 24.0–26.0 | 19.0–22.0 | — | — | — |
| 314 | ≤0.25 | ≤2.00 | ≤0.045 | ≤0.030 | 1.50–3.00 | 23.0–26.0 | 19.0–22.0 | — | — | — |
| 316 | ≤0.08 | ≤2.00 | ≤0.045 | ≤0.030 | ≤0.75 | 16.0–18.0 | 10.0–14.0 | 2.0–3.0 | ≤0.10 | — |
| 316L | ≤0.03 | ≤2.00 | ≤0.045 | ≤0.030 | ≤0.75 | 16.0–18.0 | 10.0–14.0 | 2.0–3.0 | ≤0.10 | — |
| 316Ti | ≤0.08 | ≤2.00 | ≤0.045 | ≤0.030 | ≤0.75 | 16.0–18.0 | 10.0–14.0 | 2.0–3.0 | ≤0.10 | Ti 5×(C+N) – 0.70 |
| 317/317L | ≤0.08 / ≤0.03 | ≤2.00 | ≤0.045 | ≤0.030 | ≤0.75 | 18.0–20.0 | 11.0–15.0 | 3.0–4.0 | ≤0.10 | — |
| 321 | ≤0.08 | ≤2.00 | ≤0.045 | ≤0.030 | ≤1.00 | 17.0–19.0 | 9.0–12.0 | — | ≤0.10 | Ti ≥5×(C+N), ≤0.70 |
| 330 | ≤0.08 | ≤2.00 | ≤0.040 | ≤0.030 | 0.75–1.50 | 17.0–20.0 | 34.0–37.0 | — | — | — |
| 347 | ≤0.08 | ≤2.00 | ≤0.045 | ≤0.030 | ≤1.00 | 17.0–19.0 | 9.0–13.0 | — | — | Nb 10×C – 1.00 |
| 348 | ≤0.08 | ≤2.00 | ≤0.045 | ≤0.030 | ≤1.00 | 17.0–19.0 | 9.0–13.0 | — | — | Nb 10×C – 1.00; Ta ≤0.10; Co ≤0.20 |
| 384 | ≤0.08 | ≤2.00 | ≤0.045 | ≤0.030 | ≤1.00 | 15.0–17.0 | 17.0–19.0 | — | — | — |
Annealed condition. "~" marks a typical value where the specification sets no minimum.
| Grade | Tensile strength (MPa) | Yield 0.2% (MPa) | Elongation (%) | Hardness |
|---|---|---|---|---|
| 301 | ≥515 | ≥205 | ≥40 | ≤95 HRB |
| 302 | ~515 | ~205 | ~40 | — |
| 303 | ~590 | ~240 | ~50 | — |
| 304 | ≥515 | ≥205 | ≥40 | ≤92 HRB |
| 304L | ≥485 | ≥170 | ≥40 | ≤92 HRB |
| 304H | ≥515 | ≥205 | ≥40 | ≤92 HRB |
| 305 | ≥515 | ≥205 | ≥40 | ≤88 HRB |
| 308 | ~515 | ~205 | ~40 | — |
| 309/309S | ≥515 | ≥205 | ≥40 | ≤95 HRB |
| 310/310S | ≥515 | ≥205 | ≥40 | ≤95 HRB |
| 314 | ~515 | ~205 | ~40 | — |
| 316 | ≥515 | ≥205 | ≥40 | ≤95 HRB |
| 316L | ≥485 | ≥170 | ≥40 | ≤95 HRB |
| 316Ti | ≥515 | ≥205 | ≥40 | ≤95 HRB |
| 317/317L | ≥515 / ≥485 | ≥205 / ≥170 | ≥40 | ≤95 HRB |
| 321 | ≥515 | ≥205 | ≥40 | ≤95 HRB |
| 330 | ≥485 | ≥205 | ≥30 | — |
| 347 | ≥515 | ≥205 | ≥40 | ≤92 HRB |
| 348 | ≥515 | ≥205 | ≥40 | ≤92 HRB |
| 384 | ~515 | ~205 | ~40 | — |
Figures are standard reference values for each UNS grade; exact limits are governed by the applicable ASTM/ASME specification on your order and your Mill Test Certificate.
| 304 | 316 | |
|---|---|---|
| Molybdenum | None | 2–3% |
| Chloride/pitting resistance | Moderate | Higher |
| Typical use | General-purpose, food/pharma, indoor/mild environments | Marine, chemical processing, chloride-exposed environments |
| Relative cost | Lower | Higher |
In short: if your application involves chlorides, marine exposure, or aggressive chemical media, 316 is usually the safer choice; for general-purpose and indoor/food-grade use, 304 typically performs well at lower cost.
| 316 | 321 | |
|---|---|---|
| Primary strength | Chloride/pitting corrosion resistance | Sustained high-temperature stability |
| Stabilizing element | None (relies on low carbon in 316L) | Titanium |
| Typical use | Chemical processing, marine, chloride exposure | High-temperature welded service (exhaust, process equipment) |
Grade, size, standard, quantity — send what you have and we'll respond with availability, lead time and pricing.