If you’ve seen “ASTM” on a titanium quote or spec sheet and weren’t sure exactly what it guarantees, you’re not alone — it’s one of the most-cited and least-explained terms in metal sourcing. Here’s what it actually means, and which specific standard applies to what you’re buying.
What ASTM is
ASTM International (originally the American Society for Testing and Materials) is a standards organization that publishes technical specifications used across nearly every industry — not just titanium, not just metals. When a supplier says material is “ASTM certified” or “meets ASTM,” that’s actually not specific enough on its own — ASTM publishes hundreds of separate standards, and titanium has several that cover different product forms.
The ASTM standards that actually apply to titanium mill products
| Standard | Covers |
|---|---|
| ASTM B348 | Titanium and titanium alloy bar and billet |
| ASTM B265 | Titanium and titanium alloy sheet, strip, and plate |
| ASTM B337 / B338 | Titanium and titanium alloy seamless and welded pipe |
Each standard defines the same core things for its product form: allowable chemical composition ranges by grade, required mechanical properties (tensile strength, yield strength, elongation), and dimensional tolerances.
Why this matters for your RFQ
“ASTM titanium bar” isn’t a complete spec — ASTM B348 titanium bar is. Naming the specific standard number, not just “ASTM,” removes ambiguity about which product form and which requirements apply. This is a small detail that measurably speeds up getting an accurate quote — see our guide on writing a quotable RFQ for the full list of what to include.
ASTM vs. AMS — these are not the same thing
ASTM standards are the general commercial/industrial baseline. If your application is aerospace, medical, or another high-reliability field, the material may need to meet AMS (Aerospace Material Specification) instead — a stricter, separate standard series. The two are not interchangeable, and a supplier quoting “ASTM compliant” material when you actually need AMS is a common and costly mismatch. See our AMS titanium standards guide for when you actually need it.
Grade + standard, together
A grade on its own (Gr2, Gr5) tells a supplier the target alloy — it doesn’t tell them which standard’s tolerances and testing requirements to build to. Always specify both, e.g. “Gr5 bar per ASTM B348,” not just “Gr5 bar.”
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