The 400 series covers ferritic and martensitic stainless steel — magnetic grades with lower nickel content than the 300 series, generally chosen for cost efficiency (ferritic) or hardenability (martensitic). We manufacture welded tube across the 400 series — tell us the grade and specification 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| 405 | ≤0.08 | ≤1.00 | ≤0.040 | ≤0.030 | ≤1.00 | 11.5–14.5 | ≤0.60 | — | — | Al 0.10–0.30 |
| 409 | ≤0.08 | ≤1.00 | ≤0.045 | ≤0.030 | ≤1.00 | 10.5–11.75 | ≤0.50 | — | — | Ti 6×C – 0.75 |
| 429 | ≤0.12 | ≤1.00 | ≤0.040 | ≤0.030 | ≤1.00 | 14.0–16.0 | ≤0.75 | — | — | — |
| 430 | ≤0.12 | ≤1.00 | ≤0.040 | ≤0.030 | ≤1.00 | 16.0–18.0 | ≤0.75 | — | — | — |
| 434 | ≤0.12 | ≤1.00 | ≤0.040 | ≤0.030 | ≤1.00 | 16.0–18.0 | — | 0.75–1.25 | — | — |
| 436 | ≤0.12 | ≤1.00 | ≤0.040 | ≤0.030 | ≤1.00 | 16.0–18.0 | — | 0.75–1.25 | — | Nb 5×C – 0.80 |
| 439 | ≤0.07 | ≤1.00 | ≤0.040 | ≤0.030 | ≤1.00 | 17.0–19.0 | ≤0.50 | — | ≤0.04 | Ti 0.20+4(C+N) – 1.10; Al ≤0.15 |
| 442 | ≤0.20 | ≤1.00 | ≤0.040 | ≤0.030 | ≤1.00 | 18.0–23.0 | — | — | — | — |
| 446 | ≤0.20 | ≤1.50 | ≤0.040 | ≤0.030 | ≤1.00 | 23.0–27.0 | ≤0.75 | — | ≤0.25 | — |
| Grade | C | Mn | P | S | Si | Cr | Ni | Mo | N | Other |
|---|---|---|---|---|---|---|---|---|---|---|
| 403 | ≤0.15 | ≤1.00 | ≤0.040 | ≤0.030 | ≤0.50 | 11.5–13.0 | ≤0.60 | — | — | — |
| 410 | ≤0.15 | ≤1.00 | ≤0.040 | ≤0.030 | ≤1.00 | 11.5–13.5 | ≤0.75 | — | — | — |
| 414 | ≤0.15 | ≤1.00 | ≤0.040 | ≤0.030 | ≤1.00 | 11.5–13.5 | 1.25–2.50 | — | — | — |
| 416 | ≤0.15 | ≤1.25 | ≤0.060 | ≥0.15 | ≤1.00 | 12.0–14.0 | — | ≤0.60 | — | — |
| 420 | ≥0.15 | ≤1.00 | ≤0.040 | ≤0.030 | ≤1.00 | 12.0–14.0 | — | — | — | — |
| 422 | 0.20–0.25 | 0.50–1.00 | ≤0.025 | ≤0.025 | ≤0.75 | 11.0–13.0 | 0.50–1.00 | 0.75–1.25 | — | V 0.15–0.30; W 0.75–1.25 |
| 431 | ≤0.20 | ≤1.00 | ≤0.040 | ≤0.030 | ≤1.00 | 15.0–17.0 | 1.25–2.50 | — | — | — |
| 440A/440B/440C | 0.60–1.20 | ≤1.00 | ≤0.040 | ≤0.030 | ≤1.00 | 16.0–18.0 | — | ≤0.75 | — | C by type: A 0.60–0.75; B 0.75–0.95; C 0.95–1.20 |
Annealed condition. "~" marks a typical value where the specification sets no minimum.
| Grade | Tensile strength (MPa) | Yield 0.2% (MPa) | Elongation (%) | Hardness |
|---|---|---|---|---|
| 405 | ≥415 | ≥170 | ≥20 | ≤88 HRB |
| 409 | ≥380 | ≥170 | ≥20 | ≤75 HRB |
| 429 | ≥450 | ≥205 | ≥22 | ≤88 HRB |
| 430 | ≥450 | ≥205 | ≥22 | ≤89 HRB |
| 434 | ≥450 | ≥205 | ≥22 | ≤89 HRB |
| 436 | ≥450 | ≥205 | ≥22 | — |
| 439 | ≥415 | ≥205 | ≥22 | ≤89 HRB |
| 442 | ~450 | ~275 | ~20 | — |
| 446 | ~485 | ~275 | ~20 | — |
| Grade | Tensile strength (MPa) | Yield 0.2% (MPa) | Elongation (%) | Hardness |
|---|---|---|---|---|
| 403 | ≥450 | ≥205 | ≥20 | ≤96 HRB |
| 410 | ≥450 | ≥205 | ≥20 | ≤96 HRB |
| 414 | Heat-treat dependent | — | — | — |
| 416 | ~515 | ~275 | ~30 | ≤262 HBW |
| 420 | ~655 | ~345 | ~25 | ≤241 HBW |
| 422 | Heat-treat dependent | — | — | — |
| 431 | Heat-treat dependent | — | — | — |
| 440A/440B/440C | Heat-treat dependent | — | — | — |
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.
Grade, size, standard, quantity — send what you have and we'll respond with availability, lead time and pricing.