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NP · 8 grades

# NP steel grades — 8 designations

Every grade designated under NP, with the material number it maps to, what kind of steel it is, its carbon window and how many other standards carry it. Open a grade for its full composition, properties and its designations in other standards. Every name on this page is an indicative cross-reference, not an asserted identity: the grades are close, not interchangeable. Check the composition before you substitute.

## Also known as

 8 designations

| Grade | Material no. | Category | C% by weight | Also in other standards |
|---|---|---|---|---|
| [Fe310-0](/materials/bs/fe310-0 "Fe310-0") | [1.0035](/materials/material-no/1.0035 "1.0035") | Unalloyed structural steels | — | 22 |
| [FE360-C](/materials/iso/fe360c "FE360-C") | [1.0114](/materials/material-no/1.0114 "1.0114") | Unalloyed structural steels | ≤ 0.17 | 21 |
| [FE430-B](/materials/iso/fe430b "FE430-B") | [1.0044](/materials/material-no/1.0044 "1.0044") | Unalloyed structural steels | ≤ 0.21 | 26 |
| [FE430-C](/materials/iso/fe430c "FE430-C") | [1.0143](/materials/material-no/1.0143 "1.0143") | Unalloyed structural steels | ≤ 0.18 | 16 |
| [Fe430-D](/materials/uni/fe430d "Fe430-D") | [1.0144](/materials/material-no/1.0144 "1.0144") | Unalloyed structural steels | ≤ 0.18 | 22 |
| [FE510-B](/materials/uni/fe510b "FE510-B") | [1.0045](/materials/material-no/1.0045 "1.0045") | Unalloyed structural steels | ≤ 0.24 | 17 |
| [FE510-C](/materials/uni/fe510c "FE510-C") | [1.0553](/materials/material-no/1.0553 "1.0553") | Unalloyed structural steels | ≤ 0.2 | 20 |
| [Fe510-DD](/materials/np/fe510-dd "Fe510-DD") | [1.0595](/materials/material-no/1.0595 "1.0595") | Others | ≤ 0.2 | 7 |

**This grade’s own name** — recorded in our sources as this grade’s own designation under that standard.
**Indicative** — taken from a published cross-reference table; a close match, not a guarantee of interchangeability. Verify against the mill certificate before ordering.
**Withdrawn** — designation no longer current — a separate column from the two above, so a name can be same grade and withdrawn at once.