Material number 1.4305: 1.4305
1.4305 is the European material number (Werkstoffnummer, EN 10027-2) for 1.4305, austenitic free-machining stainless steel (sulphur-bearing) specified in EN 10088-3.
Reading 1.4305 digit by digit
An EN 10027-2 number has the form 1.XXYY. The leading 1 marks it as steel. The pair 43 is the steel group, and for this number that group is stainless steels with ≥ 2.5 % Ni, no Mo. The final pair 05 is a sequential count inside that group and carries no meaning of its own — 1.4305 is simply the 5th entry registered there.
The group digits are the useful part. Reading 43 tells you what kind of steel you are looking at before you know anything else about it, and the 2 other numbers from group 43 held here are listed below.
1.4305 identity card
| Item | Value |
|---|---|
| Material number (EN 10027-2) | 1.4305 |
| Symbolic grade name | 1.4305 |
| Steel group | 43 — stainless steels with ≥ 2.5 % Ni, no Mo |
| Sequential number in group | 05 |
| Specified in | EN 10088-3 |
| Steel family | Stainless steel |
| Yield, first condition in the table | ≥ 190 MPa (Bar ≤ 160 mm, +AT solution annealed) |
| Tensile, same condition | 500–750 MPa |
| Cross-references held | 6 grades in 5 systems |
1.4305 (X8CrNiS18-9) is the EN free-machining 303: 18 % Cr, 8–10 % Ni, 0.15–0.35 % S. 190 MPa yield, 500–750 MPa tensile, machinability ~80 % of 1.4301. Data, limits and the 303/SUS303 equivalence.
Full data sheet for 1.4305 → · Equivalent grades → · EN 10088-3 →
Group 43 — the neighbouring numbers
Same group digits, so the same broad class of steel. The sequential digits do not rank them.