WNr 1.7218 Tubing
WNr is one of several abbreviations for the German material number. On certificates and drawings you may see W.-Nr., WNr, Werkstoff-Nr. or Mat. No., all followed by the same figure: 1.7218 for 25CrMo4.
WNr as an Abbreviation
In German technical documents: W = Werkstoff (material), Nr = Nummer (number). 'WNr' is therefore the abbreviated form of 'Werkstoff-Nummer'. It appears in MTC documentation, purchase orders, drawings, and material certifications from German and European sources. Buyers should be aware that 'WNr 1.7218', 'Werkstoff 1.7218', '1.7218', and '25CrMo4' all refer to the same alloy.
| Abbreviation / Term | Meaning | Example |
|---|---|---|
| WNr | Werkstoff-Nummer (material number) | WNr 1.7218 |
| Werkstoff-Nr | Werkstoff-Nummer (spelled out) | Werkstoff-Nr. 1.7218 |
| 1.7218 | The material number itself | Identifies 25CrMo4 |
| 25CrMo4 | The EN name designation | Same grade |
| AISI 4130 | North American close equivalent | Different standard limits |
Finding the Material Number on a Certificate
A European inspection certificate normally identifies the material twice, by short name and by number. The entry may read "25CrMo4 / 1.7218" or list them in separate fields headed steel grade and material number. Either is enough to confirm the grade.
When you check a certificate against an order, confirm in turn:
- the material number or short name matches the grade ordered
- the product standard and its edition are stated
- the delivery condition symbol, such as +N, is as ordered
- the dimensions match
- the heat number on the certificate matches the marking on the tube
- the certificate type is 3.1 or as specified
If any entry is missing or different, query it before the material is used. The certificate types are explained under EN 10204 3.1, and the grade under Werkstoff 1.7218 tubing.
Material Numbers on Drawings
On a drawing, the material number usually appears in the title block or the parts list beside the item. Older German drawings may add the DIN standard; newer ones give the EN standard and the delivery condition. If the block shows only a number with no standard or condition, ask the designer before ordering, because 1.7218 can be supplied soft, normalized or quenched and tempered, and the difference in strength is large.
Frequently Asked Questions
Why does documentation sometimes show 'WNr' and sometimes '1.7218' without prefix?
Both are acceptable. Some documents abbreviate 'Werkstoff-Nummer' as WNr; others omit the prefix and list only the number. Both '1.7218' and 'WNr 1.7218' identify the same alloy grade.
What does WNr stand for?
Werkstoffnummer, the German term for material number.
Is Mat. No. 1.7218 the same as WNr 1.7218?
Yes. Both are abbreviations for the same material number.
Does the material number tell me the heat treatment condition?
No. The condition is stated separately, for example +N or +QT.
Enquire for WNr 1.7218 / 25CrMo4 Tubing
Provide the WNr, applicable standard, metric dimensions, and MTC requirement.
- WNr: 1.7218 / 25CrMo4
- EN 10297
- OD & Wall mm
- Condition
- Quantity
- MTC
- Delivery