German and many European drawings identify titanium by Werkstoffnummer rather than ASTM grade. The common mappings are 3.7025 = Grade 1, 3.7035 = Grade 2, 3.7055 = Grade 3, 3.7065 = Grade 4, 3.7165 = Grade 5 (Ti-6Al-4V), 3.7235 = Grade 7, 3.7195 = Grade 9 and 3.7105 = Grade 12. The table below adds UNS numbers and the DIN product standards these drawings usually cite.
Titanium Werkstoffnummer to ASTM grade table
| German designation | ASTM grade | UNS | Material | Typical service |
|---|---|---|---|---|
| 3.7025 | Grade 1 | R50250 | Unalloyed titanium, softest and most formable | Deep drawing, cladding, linings |
| 3.7035 | Grade 2 | R50400 | Unalloyed titanium, the workhorse purity | Chemical process equipment, seawater service |
| 3.7055 | Grade 3 | R50550 | Unalloyed titanium, higher strength | Pressure shells where Grade 2 strength runs short |
| 3.7065 | Grade 4 | R50700 | Unalloyed titanium, highest CP strength | Fittings, airframe details |
| 3.7165 | Grade 5 | R56400 | Ti-6Al-4V | Machined and structural parts |
| WL 3.7164 | Grade 5 family | R56400 | Ti-6Al-4V under a German aerospace Werkstoff-Leistungsblatt; not a second DIN Werkstoff-Nummer | Parts ordered to the cited aerospace materials sheet |
| 3.7235 | Grade 7 | R52400 | Titanium with 0.12 to 0.25 percent palladium | Reducing acids, hot chloride, crevice corrosion service |
| 3.7195 | Grade 9 | R56320 | Ti-3Al-2.5V | Tube and hydraulic lines needing more strength than CP grades |
| 3.7105 | Grade 12 | R53400 | Ti-0.3Mo-0.8Ni | Hot brine and chloride process equipment |
These are working correspondences, not word-for-word identical specifications. The chemistry brackets and testing rules in the DIN documents differ in detail from their ASTM counterparts, so the drawing’s own standard always governs. When we quote against a Werkstoffnummer drawing, the reconciliation happens on the mill test certificate, where the reported chemistry and mechanical values can be checked against both documents before material is released.
To look a grade up directly by number, UNS, Werkstoffnummer or standard, use the titanium grade cross-reference tool. The rest of this page covers what a German drawing specifically asks for and how to order ASTM mill product against it.
How do German drawings specify titanium?
A German titanium call-out usually has three parts: the Werkstoff-Nummer for the material itself, a DIN product standard for the form, and an inspection-document requirement. Composition sits in DIN 17850 for unalloyed titanium and DIN 17851 for titanium alloys. Product standards include DIN 17860 for plate, sheet and strip, DIN 17862 for bar and DIN 17864 for forgings. Older drawings may cite the withdrawn DIN 17861 for seamless tube; the current production route and acceptance standard must then be agreed before quotation. If EN 10204 3.1 or another document type is required for ASTM B348 bar, ASTM B265 plate and sheet or ASTM B381 forgings, state it in the RFQ and purchase order; Beiyu confirms the reporting and validation scope in the quotation.
| Part of a German titanium call-out | Standard the guide names |
|---|---|
| Composition, unalloyed titanium | DIN 17850 |
| Composition, titanium alloys | DIN 17851 |
| Plate, sheet and strip | DIN 17860 |
| Bar | DIN 17862 |
| Forgings | DIN 17864 |
| Seamless tube on older drawings | DIN 17861 |
What is the difference between 3.7164 and 3.7165?
The designations can both appear with Ti-6Al-4V, but they are not two interchangeable Werkstoffnummern. The DIN Werkstoff-Nummer is 3.7165. WL 3.7164 is a Werkstoff-Leistungsblatt designation used in German aerospace documentation. If a drawing cites WL 3.7164 and its associated aerospace specification, quote against that complete requirement rather than substituting commercial Grade 5 by number alone. If it cites 3.7165 with a DIN product standard, reconcile that standard with the proposed ASTM Grade 5 mill product and the required inspection document before quotation.
| German designation | Designation type and ordering meaning |
|---|---|
| WL 3.7164 | Werkstoff-Leistungsblatt designation used in German aerospace documentation; order to the complete cited sheet and related requirements |
| 3.7165 | DIN Werkstoff-Nummer for Ti-6Al-4V; reconcile the named DIN product standard with the proposed ASTM route |
Which number applies to Grade 23, the ELI version?
Ti-6Al-4V ELI has no separate Werkstoffnummer in common use. German drawings usually write 3.7165 ELI or cite the ASTM standard directly. Note that the UNS number then depends on which standard is ordered: ASTM B348 bar, B265 plate and B863 wire designate Grade 23 as UNS R56407, while the surgical implant specification ASTM F136 uses UNS R56401. The distinction, and when each version is worth paying for, is covered in our Grade 5 vs Grade 23 comparison.
| Standard ordered | UNS designation for Grade 23 |
|---|---|
| ASTM B348 bar | R56407 |
| ASTM B265 plate | R56407 |
| ASTM B863 wire | R56407 |
| ASTM F136, surgical implant specification | R56401 |
How to order ASTM mill product against a Werkstoffnummer drawing
Many titanium mills outside Europe work primarily to ASTM specifications, so a buyer holding a DIN drawing may propose a corresponding ASTM grade. The RFQ should state the German designation and DIN standard exactly as shown, the proposed ASTM grade, product form, dimensions and tolerances, required condition and surface finish, and the inspection-document and heat-traceability requirements. We compare the two chemistry and mechanical-property frameworks at quotation stage and flag any tighter or additional requirement before a substitution is accepted. A full overview of the grades themselves is in the titanium grades comparison guide.
Why a number match is not yet an acceptance basis
A cross reference table lines up designations. It does not transfer the acceptance requirements from one system to the other, and an order that cites only the matched number leaves the governing document unstated.
| What a matched number gives | What it does not give |
|---|---|
| The equivalent designation in the other system | The product form requirements that go with it |
| A way to read a foreign drawing | The tolerance table that applies to the ordered section |
| A common reference in correspondence | The reporting scope for the certificate |
What to put on the order alongside the cross reference
| Line | Why the cross reference does not cover it |
|---|---|
| Governing product standard | Acceptance follows the standard named, not the designation matched |
| Grade with its UNS number | The number follows the specification chain the order names |
| Governing dimension with tolerance | Dimensional callouts are not part of a designation match |
| Certificate and reporting scope | EN 10204 3.1 mill test certificate with heat number traceability, scope set by the order |
A cross reference is a translation aid. The purchase order still has to name the document that acceptance will be judged against.
Specification detail with sources
DIN’s own document set anchors this table: composition sits in DIN 17850 for unalloyed titanium and DIN 17851 for alloys, the form standards run DIN 17860 for flat product, 17862 for bar and 17864 for forgings, and EN 10204’s type 3.1 certificate succeeded the DIN 50049 3.1B line older German drawings carried. The eight common correspondences listed above, 3.7035 to Grade 2 (UNS R50400) and 3.7165 to Grade 5 (UNS R56400) among them, are working equivalences whose chemistry brackets differ in detail, which is why the drawing’s own standard always governs the order.
Beiyu Titanium’s quotation practice against a Werkstoffnummer drawing is to state 2 designations side by side, the ASTM grade with its UNS number next to the 3.7xxx call-out, and to reconcile the chemistry brackets on the EN 10204 3.1 certificate before release, the same dual-designation review Beiyu runs when a heat starts life under Chinese GB/T 3620.1 paperwork. Penn Ma has reviewed these cross-standard call-outs through 15 years of titanium export at Beiyu, and the mill envelope behind a Beiyu quotation covers B348 bar from 1 to 500 mm diameter and B265 flat product to 70 mm thick, the two forms German process-equipment drawings most often specify.