---
title: Titanium Grade 2 vs Grade 5: Which One Do You Actually Need?
description: Gr5 isn't 'better' than Gr2 — it's different. How to tell which one your application needs, and why defaulting to Gr5 often costs more for no benefit.
pubDate: 2026-08-19
---

A buyer sends an RFQ for a titanium reactor vessel. The supplier quotes it
back asking one question first: "Gr2 or Gr5?" The buyer picked Gr5 because
it was the grade they'd heard of — it sounded like the stronger, more
serious choice. Two weeks later, after the quote came back roughly 40%
higher than expected and the mill flagged a longer lead time for the
thicker-gauge forming, the buyer asked us why. The answer wasn't that Gr5
was wrong — it's that nobody had asked what the part actually needed to do.

## The difference isn't "better," it's "different"

**Gr2** is commercially pure titanium — no significant alloying elements.
**Gr5 (Ti-6Al-4V)** is an alloy, roughly 6% aluminum and 4% vanadium added
to the base metal. That single change is what separates them, and it cuts
both ways: Gr5 gains strength and loses corrosion resistance, formability,
and machinability. Gr2 does the reverse — and it's the first thing to pin
down before you put together an [RFQ](/quote-builder), since the grade
changes the tolerance, lead time, and price a supplier can quote.

Neither one is the upgrade. They're built for different jobs.

## Gr2 vs Gr5, side by side

| | Gr2 (commercially pure) | Gr5 / Ti-6Al-4V |
|---|---|---|
| Composition | Unalloyed titanium | ~6% aluminum, ~4% vanadium |
| Tensile strength | Lower (general baseline ~345 MPa min per ASTM B348) | Roughly double Gr2 (~895 MPa min per ASTM B348) |
| Corrosion resistance | Excellent — the reference grade for this | Good, but lower than Gr2 |
| Formability | Excellent — bends and forms easily | Limited — work-hardens, needs more force |
| Machinability | Easier | Harder — more tool wear, slower cycle times |
| Weldability | Straightforward | Requires more controlled process |
| Relative cost | Lower | Higher — both material and processing |
| Governing ASTM standard | ASTM B348 (bar), B265 (sheet) | ASTM B348 (bar), B265 (sheet) |
| Aerospace-grade equivalent | — | AMS 4928 |

## Which one your application actually needs

This matches the same logic our [RFQ Builder](/quote-builder) uses to
point buyers toward a starting spec:

- **Chemical processing, marine and seawater equipment** — corrosion
  resistance is the requirement, not strength. **Gr2 is the standard
  choice.** Specifying Gr5 here adds cost and machining difficulty for a
  strength margin the application doesn't use.
- **Structural parts, general machining, sporting goods (e.g. bike
  frames)** — strength-to-weight ratio is the actual requirement.
  **Gr5 is the standard choice.**
- **Aerospace components** — Gr5, but typically to **AMS 4928**, not
  ASTM B348 — a stricter, separate specification. See our
  [AMS titanium guide](/guides/ams-titanium-specifications-explained)
  if you're not sure which one your application needs.
- **Medical implants** — a purer version of Gr5 with tighter impurity
  limits, **Gr23 (Ti-6Al-4V ELI)**, governed by ASTM F136 — not plain
  Gr5 and not Gr2.

## The mistake worth avoiding

Gr5 is the grade most buyers have already heard of, so it gets treated as
the "serious" or "premium" default even when the application is corrosion-
driven, not strength-driven. Commercially pure titanium isn't a downgrade
from an alloy — it's the correct engineering choice for a large share of
industrial equipment, and it's usually cheaper and faster to get quoted
and machined. Before defaulting to Gr5, it's worth asking what property
the part actually depends on: if the honest answer is "it just needs to
not corrode," Gr2 is very likely the right spec.