Werkstoff 1.7218 Tubing
Werkstoff 1.7218 sits in a row of closely numbered chromium-molybdenum steels. The numbers differ by a digit or two while the steels differ considerably, so it is worth knowing the neighbours.
Who Uses the 'Werkstoff' Terminology
The Werkstoff-Nummer system is widely used across Germany, Austria, Switzerland, and European industry more broadly. Engineering drawings from these markets routinely specify material by 1.XXXX number rather than by grade name. Procurement teams, quality managers, and purchasing departments in these regions search for 'Werkstoff 1.7218 tubing' when sourcing from international suppliers, because the Werkstoff-Nr is the , unambiguous identifier on their documentation.
| Parameter | Detail |
|---|---|
| Werkstoff-Nr | 1.7218 |
| Grade name | 25CrMo4 |
| Alloy family | Chromium-Molybdenum low-alloy steel |
| North American equivalent | AISI/SAE 4130 (close — not identical) |
| Applicable tube standard | EN 10297 |
| Condition codes | +A, +N, +QT |
| Documentation | EN 10204 3.1 MTC |
Specifying 1.7218 in International Procurement
When sourcing Werkstoff 1.7218 tubing internationally, include the full specification: Werkstoff-Nr. 1.7218 (25CrMo4), product standard EN 10297, metric dimensions (OD and wall in mm), condition (e.g., +N), and MTC documentation (EN 10204 3.1). International suppliers familiar with European standards will recognise the Werkstoff-Nr immediately.
Neighbouring Material Numbers
| Werkstoff number | Short name | Approximate carbon | Nearest American grade |
|---|---|---|---|
| 1.7218 | 25CrMo4 | 0.25 % | 4130 |
| 1.7220 | 34CrMo4 | 0.34 % | 4135 |
| 1.7225 | 42CrMo4 | 0.42 % | 4140 |
All three are chromium-molybdenum steels with similar alloy content; carbon is what separates them. As carbon rises, the steel hardens to a higher strength and becomes harder to weld. 42CrMo4 is a very common bar steel in Europe, and a transposed digit on an order can deliver it in place of 25CrMo4. For welded tube structures that would be a serious error.
To prevent mistakes, write both the number and the short name on the order, for example "1.7218 (25CrMo4)", and check both on the certificate when the material arrives. The higher-carbon comparison is discussed on 4130 vs 4140, and the numbering system on DIN 1.7218 tubing.
Frequently Asked Questions
Is 'Werkstoff 1.7218' the same as '25CrMo4'?
Yes. 1.7218 is the Werkstoff-Nummer (numerical identifier) for the grade named 25CrMo4 in the EN designation system. They identify the same alloy.
What is the difference between 1.7218 and 1.7225?
1.7218 is 25CrMo4 with about 0.25 percent carbon. 1.7225 is 42CrMo4 with about 0.42 percent carbon, similar to 4140.
Which Werkstoff number corresponds to 4130?
1.7218, the grade 25CrMo4, is the closest European equivalent.
Can 42CrMo4 be used instead of 25CrMo4?
Not for welded structures. Its higher carbon makes it much harder to weld.
How do I avoid ordering the wrong Cr-Mo grade?
Write both the material number and the short name on the order and check both on the certificate.
Source Werkstoff 1.7218 / 25CrMo4 Tubing
Provide your Werkstoff-Nr, product standard, metric dimensions, and documentation requirement.
- Werkstoff 1.7218 / 25CrMo4
- EN 10297
- OD & Wall mm
- Condition
- Quantity
- MTC
- Delivery