DIN 1.7218 Tubing
1.7218 is the German material number, or Werkstoffnummer, for the steel named 25CrMo4. Older drawings quote it with a DIN standard; current ones pair it with European EN standards.
The Werkstoff-Nummer System
Germany's DIN system introduced a numerical material designation (Werkstoff-Nummer) that is now incorporated into the broader European EN system. The number format for alloy steels: 1.XXXX, where the leading '1' identifies the ferrous metals group. The four digits identify the specific alloy sub-group and material within it. 1.7218 is within the 1.7000 group — chromium and chromium-molybdenum steels.
| System | Designation | Equivalence |
|---|---|---|
| Werkstoff-Nr (DIN/EN) | 1.7218 | Primary German/EU identifier |
| EN name designation | 25CrMo4 | European EN equivalent |
| AISI/SAE | 4130 | North American close equivalent |
| UNS | G41300 | Unified cross-reference |
| Product standard (tube) | EN 10297 | Seamless mechanical tubes |
| Supply form (verified) | Seamless tubing | Project verified |
| MTC | EN 10204 3.1 available | Project verified |
Procurement on German/European Drawings
When ordering against a German drawing specifying 1.7218, buyers should supplement the Werkstoff-Nummer with: the applicable product standard (EN 10297 for seamless mechanical tubing), the required condition suffix, metric dimensions (OD and wall in mm), and the required MTC documentation (EN 10204 3.1). German-drawing procurement also typically specifies tolerances in accordance with the applicable EN standard tolerance class.
How the Number 1.7218 Is Built
German material numbers follow a fixed pattern. The first digit is the material group, and 1 means steel. The next two digits are the steel group number; the 72 group contains chromium-molybdenum steels with a low molybdenum content. The final two digits are a serial number for the individual grade within that group.
So 1.7218 tells a reader at a glance that the material is a Cr-Mo alloy steel, and identifies it uniquely as 25CrMo4. The number and the short name are two labels for one steel and can be used interchangeably.
DIN standards for these steels have been replaced by European standards, so a drawing quoting an old DIN number should be read against the current EN equivalent. When ordering, give the standard, the grade or number, the delivery condition and metric dimensions. For American-grade supply see AISI 4130 tubing; for the grade comparison see EN 25CrMo4 tubing.
Frequently Asked Questions
Is 1.7218 the same as 4130?
1.7218 identifies 25CrMo4, which is the European close equivalent of AISI 4130. The alloy family is identical; minor composition limit differences exist between the ASTM and EN specifications. For safety-critical applications, a formal comparison is required before treating them as identical.
What does the 1 in 1.7218 mean?
It is the material group number for steel in the German numbering system.
Is DIN 1.7218 still a valid designation?
The material number remains in use. The DIN product standards behind it have been superseded by EN standards.
Which group do Cr-Mo steels fall in under German material numbers?
The 72 group covers chromium-molybdenum steels with a low molybdenum content.
Enquire for DIN 1.7218 / 25CrMo4 Tubing
Provide your Werkstoff-Nr, applicable standard, metric dimensions, and condition for a quotation.
- Grade: 1.7218 / 25CrMo4
- Standard: EN 10297
- OD & Wall (mm)
- Condition
- Quantity
- MTC
- Delivery