ASTM B863 Titanium Wire: Complete Specification Guide | Grade 1-5, 7, 9, 23

Published by Engineering Team, Shaanxi Qianyi Tuoda Technology Co., Ltd on 2026-10-27

ASTM B863 Titanium Wire: Complete Specification Guide

Reviewed by the Engineering Team, Shaanxi Qianyi Tuoda Technology Co., Ltd.

1. Scope and Coverage

ASTM B863 covers titanium and titanium-alloy wire for general industrial, aerospace, medical, and consumer applications. This is the foundational material standard for titanium wire — the feedstock for springs, fasteners, welding filler, medical implants, eyewear frames, and woven mesh.

The standard covers commercially pure titanium (Grades 1, 2, 3, 4, 7, 11, 16, 17) and alloy grades (Grades 5, 9, 12, 23, 24, 25, 26, 27, 28, 30, 31, 33, 34, 35, 36, 37, 38). For industrial procurement, Grades 1, 2, 5, 7, 9, and 23 represent over 90% of volume.

B863 defines chemical composition, diameter tolerance (Class 1 precision / Class 2 commercial), ovality, straightness (for straight-length wire), coil weight, surface condition, and packaging. It does not cover:

• Welding electrodes (AWS A5.16 — though many B863 wires are dual-compliant; see FAQ Q1)
• Wire for surgical implants (ASTM F67 / F136 — medical-specific requirements)
• Wire rope or cable (ASTM B831 or proprietary specs)

Critical distinction: B863 is a material standard, not a product standard. It defines what the wire is (chemistry, dimensions, surface) but not what it does. A complete purchase order must add the end-use specification: "ASTM B863 Grade 2, Class 1, for spring manufacturing, straight length, pickled surface, diameter 1.50mm ±0.025mm."

2. Wire Applications: Spring, Welding, Fastener, Medical

Cross-reference note: Many buyers cite both B863 and AWS A5.16 for welding wire. B863 ensures material quality; A5.16 ensures weld-metal performance. For spring applications, B863 is the only relevant standard. [FILL: your available wire forms — coiled/spooled/straight-cut, and typical coil weights]

3. Grade Selection by Application

Selection logic: Grade 2 is the universal default — good for 80% of wire applications. Grade 5 for high-strength springs and aerospace fasteners. Grade 23 for medical (ELI = Extra Low Interstitial = better fatigue life and biocompatibility). Grade 7 for chemical-service springs where crevice corrosion is a concern.

4. Chemical Composition

Key observation: Grade 23 (ELI) differs from Grade 5 only in maximum oxygen (0.13% vs 0.20%) and hydrogen (0.0125% vs 0.015%). This small difference dramatically improves fatigue life and fracture toughness — critical for medical implants and high-cycle springs.

5. Diameter Tolerances and Straightness

Straightness (for straight-length wire): Maximum deviation from straight is 1.5mm per 1000mm length. For spring wire, straightness is less critical than diameter consistency — a slight bow does not affect coiling.

Coil characteristics: Coiled wire for automatic processing must have consistent "cast" (natural curvature of the coil) and "helix" (twist). B863 does not specify cast/helix; buyers should add: "coil set ≤3° per 1000mm, no kinks, no sharp bends." [FILL: your available diameter range and tolerance class, e.g. "Ø0.1-8.0mm, Class 1 and Class 2"]

6. Surface Condition and Finish

Surface defect limits: For spring and fastener wire, B863 Section 7 requires "no laps, seams, or surface imperfections that would adversely affect the end use." For critical applications, specify "no surface defects visible at 10× magnification" and require eddy current testing per ASTM E566.

7. Procurement Checklist

1. Standard + grade: "ASTM B863 Grade 2 (UNS R50400)" — not "titanium wire" alone
2. Diameter + tolerance class: "1.50mm, Class 1" (precision) or "Class 2" (commercial)
3. Form: Coiled (kg per coil), spooled (m per spool), or straight lengths (mm per piece)
4. Surface: Pickled / bright-annealed / polished — specify for spring/medical applications
5. Condition: Annealed (soft, for forming) or cold-drawn (spring temper, for springs)
6. Packaging: Moisture-proof wrapping for pickled wire; sealed plastic for bright-annealed
7. Certification: EN 10204 3.1 MTR; PMI for Gr7/Gr23; eddy current test report for spring wire

Common failures: Not specifying tolerance class (supplier ships Class 2 when Class 1 was needed), not specifying surface condition (spring fails from surface scratch acting as fatigue site), confusing B863 with AWS A5.16 for welding wire (wrong standard on PO), accepting coiled wire with kinks (destroys automatic coiling machine feed).

8. Frequently Asked Questions

Maintained by the Engineering Team at Shaanxi Qianyi Tuoda Technology Co., Ltd. Data per ASTM B863 / ASME SB-863. Procurement support: sales@sxqytd.com.