# CW numbers simply explained

Quelle: <https://mvg-frankfurt.de/en/materials/cw-numbers>

> Structure of the copper material number to EN 1412: C, product form, three digits, group letter. With a table of the groups and a comparison with 2.xxxx and UNS.

Copper materials carry a six-character number according to EN 1412. It indicates the product form and material group.

## Structure using the example CW614N

1. **C** Copper
2. **W** Product form
3. **614** Serial number
4. **N** Material group

The three digits are a serial number. They say nothing about the composition.

## Second position: product form

| Letter | Meaning |
|---|---|
| W | Wrought material: sheet, strip, bar, tube, wire, profile |
| C | Cast material (casting) |
| B | Ingot metal for remelting |
| F | Filler metal and brazing alloy |
| M | Master alloy |
| R | Refined copper |
| S | Scrap |
| X | Non-standardised material |

## Last position: material group

| Letter | Material group | Example |
|---|---|---|
| A, B | Copper | CW004A Cu-ETP, CW024A Cu-DHP |
| C, D | Low-alloyed copper alloys (alloying elements below 5 %) | – |
| E, F | Special copper alloys (alloying elements from 5 %) | – |
| G | Copper-aluminium alloys (aluminium bronze) | CW306G CuAl10Fe3Mn2 |
| H | Copper-nickel alloys | – |
| J | Copper-nickel-zinc alloys (nickel silver) | – |
| K | Copper-tin alloys (bronze) | CW452K CuSn6, CC493K Rg7 |
| L, M | Binary copper-zinc alloys (brass) | CW508L CuZn37 |
| N, P | Copper-zinc-lead alloys (free-cutting brass) | CW614N CuZn39Pb3 |
| R, S | Multi-component copper-zinc alloys (special brass) | CW713R |

## Comparison with 2.xxxx and UNS

For copper, the former DIN material number starts with 2.0 or 2.1. UNS is the US system with C and five digits.

*Copper materials from our range: EN number, designation, old DIN, material no., UNS*

| EN 1412 | Designation | Old DIN | Material no. | UNS | At MVG |
|---|---|---|---|---|---|
| CW004A | Cu-ETP | E-Cu57 / E-Cu58 | 2.0060 / 2.0065 | C11000 | [Copper E-Cu](https://mvg-frankfurt.de/en/semi-finished/werkstoff/kupfer-e-cu) |
| CW024A | Cu-DHP | SF-Cu | 2.0090 | C12200 | [Sheet](https://mvg-frankfurt.de/en/sheet-metal-cutting/kupfer-messing/sf-cu)[Semi-finished product](https://mvg-frankfurt.de/en/semi-finished/werkstoff/kupfer-sf-cu) |
| CW508L | CuZn37 | Ms63 | 2.0321 | C27200 | [Sheet](https://mvg-frankfurt.de/en/sheet-metal-cutting/kupfer-messing/ms63)[Semi-finished product](https://mvg-frankfurt.de/en/semi-finished/werkstoff/messing-ms63) |
| CW614N | CuZn39Pb3 | Ms58 | 2.0401 | C38500 | [Brass Ms58](https://mvg-frankfurt.de/en/semi-finished/werkstoff/messing-ms58) |
| CC493K | CuSn7Zn4Pb7-C | Rg7 (G-CuSn7ZnPb) | 2.1090 | ≈ C93200 | [Gunmetal Rg7](https://mvg-frankfurt.de/en/semi-finished/werkstoff/rotguss-rg7) |

UNS: comparable US grade, not identical in every limit. The certificate supplied with the delivery is binding.

[EN AW numbers for aluminium](https://mvg-frankfurt.de/en/materials/en-aw-aluminium) · [Stainless steel grades](https://mvg-frankfurt.de/en/materials/stainless-steel) · [Tubes & bars](https://mvg-frankfurt.de/en/semi-finished) · [All materials](https://mvg-frankfurt.de/en/materials)