Compare alloys
Two to four alloys on shared scales: what each standard actually specifies, where the PREN windows sit, and the properties side by side. The selection lives in the URL, so a comparison is a link you can keep or send.
The interactive picker loads with JavaScript. The suggested comparisons and the full library table below work without it.
Suggested comparisons
304 vs 316L
The everyday stainless against the molybdenum marine grade.
The chloride ladder
Austenitic to duplex to super duplex, watched by PREN.
Hardenable stainless
Three martensitic grades trading toughness for hardness.
Carbon and low-alloy
Structural plate, free-machining bar and a Q&T engineering steel.
The whole library
Every alloy in the reference set. Up to 4 can be compared at once.
| Alloy | Family | PREN | Tensile | Yield |
|---|---|---|---|---|
| 304On the floor | Austenitic stainless | 18–21,6 | 515 MPa | 205 MPa |
| 304LOn the floor | Austenitic stainless | 17,5–21,1 | 485 MPa | 170 MPa |
| 316On the floor | Austenitic stainless | 22,6–29,5 | 515 MPa | 205 MPa |
| 316LOn the floor | Austenitic stainless | 22,6–29,5 | 485 MPa | 170 MPa |
| 316Ti | Austenitic stainless | 22,6–29,5 | 520 MPa | 215 MPa |
| 321 | Austenitic stainless | 17–20,6 | 515 MPa | 205 MPa |
| 310S | Austenitic stainless | 24–26 | 520 MPa | 205 MPa |
| 409 | Ferritic stainless | 10,5–11,75 | 430 MPa | 230 MPa |
| 430 | Ferritic stainless | 16–18 | 450 MPa | 260 MPa |
| 410 | Martensitic stainless | 11,5–13,5 | 500 MPa | 290 MPa |
| 420 | Martensitic stainless | 12–14 | 650 MPa | 340 MPa |
| 440C | Martensitic stainless | 16–20,48 | 760 MPa | 450 MPa |
| 2205On the floor | Duplex and super duplex | 34,14–37,75 | 655 MPa | 450 MPa |
| 2507 | Duplex and super duplex | 39,39–47,62 | 800 MPa | 550 MPa |
| 17-4PH | Precipitation hardening | 15–17,5 | 1 030 MPa | 790 MPa |
| A36 | Carbon and structural steel | n/a | 400 MPa | 250 MPa |
| 1018 | Carbon and structural steel | n/a | 440 MPa | 370 MPa |
| 4140On the floor | Low-alloy steel | n/a | 655 MPa | 415 MPa |
Guidance for narrowing a choice, not a specification. Ranges are the governing standard's own limits; where a cap applies it is drawn as a ceiling, never as a quantity. Design to the standard and the mill certificate, then request a quote.
The specifications and data on this site are provided for general information only. Verify any real-world project with a qualified metallurgist before relying on these figures. We take no responsibility for the use and application of this information.