Name: Ti-38-644 Beta-C Bar | Specification & Sizes | NiTiCu
Price: 45.00 USD
Availability: InStock

Description

Ti-38-644 Bar — Beta-C Ti-3Al-8V-6Cr-4Mo-4Zr

Ti-38-644 is Beta-C titanium, Ti-3Al-8V-6Cr-4Mo-4Zr. Send the required product form, size, delivery condition and governing material specification for review. AMS 4957 applicability must be checked for the actual order; the broad catalogue dimensions and processing notes below do not establish conformance.

✨ Executive Summary

Ti-38-644 Bar (Ti-3Al-8V-6Cr-4Mo-4Zr), also called Beta-C, is listed for specification-based inquiries. Review the required strength, toughness and fatigue acceptance using data for the actual size and condition. Alloy reference values do not establish aerospace design allowables or batch conformity.

🔑 Why Choose It

High specific strength: With density ~4.82 g/cm³, Ti-38-644 Bar in STA condition reaches strengths that rival high‑strength steels at a fraction of the weight.
Fracture and fatigue: The near‑beta microstructure of Ti-38-644 Bar supports high fracture toughness and excellent fatigue limits, essential in AMS 4957 aerospace bars.
Hardenability and process window: Ti-38-644 Bar responds strongly to solution treatment and aging (STA), allowing property tailoring for thick and thin sections.
Corrosion and temperature: Better general corrosion resistance than high‑strength steels; stable mechanical response across common aerospace temperature windows.
Traceability: specify heat/lot identification and the material documents required for the actual order. Conformance must be supported by the applicable batch records.

🧪 Alloy Identity & Nomenclature

Formal designation: Ti‑3Al‑8V‑6Cr‑4Mo‑4Zr
Informal / trade: Beta‑C titanium
Product form: confirm round bar or wire and the required delivery condition. AMS 4957H publicly lists nominal diameter or thickness up to 15.88 mm (0.625 in), solution heat treated and cold drawn, with a reference to section 8.7. Other sizes, forgings, forging stock or STA requirements need review against the full governing specification and order; do not assume automatic AMS 4957 applicability.
UNS style references: Near‑beta Ti family (context for specifiers)

Ti-38-644 Bar is intentionally balanced with β‑stabilizers (V, Cr, Mo) and Zr for solid‑solution strengthening; Al contributes to α stability and creep resistance in mixed structures. Within AMS 4957, chemistry windows and melting practice keep the alloy inside the target β field for predictable heat‑treat response.

⚙️ Ti-38-644 Chemical Composition Reference

Element	Typical wt%	Function
Ti	Bal.	Matrix
Al	~3.0	Strength, creep, α stabilization
V	~8.0	β stabilization, strength
Cr	~6.0	β stabilization, corrosion, hardenability
Mo	~4.0	β stabilization, strength
Zr	~4.0	Solid‑solution strengthening, toughness

Note: Lot‑specific ranges follow AMS 4957; melt practice and cleanliness are critical to obtain the intended Ti-38-644 Bar properties.

🧬 Microstructure & Metallurgy

Ti-38-644 Bar is a near-beta alloy. The following microstructure and processing information is reference guidance; it does not define the delivery condition or acceptance requirements of an AMS 4957 order.

β transus typically in the 780–800 °C range (lot dependent). Processing near, below, or slightly above the transus tailors grain size and α precipitate morphology.
Aging (480–595 °C) promotes fine α precipitation inside β, raising yield and UTS while preserving reasonable ductility.
Section thickness effect: Compared with α‑β alloys, Ti-38-644 Bar maintains strength more uniformly through larger diameters due to improved hardenability.

📊 Physical & Mechanical Properties (Reference Values)

Density: ~4.82 g/cm³
Elastic modulus: ~110–120 GPa
Poisson’s ratio: ~0.33
Thermal expansion (20–300 °C): ~8.5–9.3 ×10⁻⁶ /K
Thermal conductivity: ~6–8 W/m·K (temperature dependent)

Representative Room‑Temperature Mechanical Properties (STA):

UTS: ~1240–1380 MPa (size/condition dependent)
0.2% YS: ~1100–1250 MPa
Elongation: ~10–15%
Reduction of area: ~20–30%
Hardness: typically 36–42 HRC (converted), depending on aging schedule

These figures are reference values for the stated size and condition. They are not AMS 4957 acceptance limits or design allowables; verify the required properties using the governing specification and relevant test data.

🔥 Heat Treatment

Goal: Achieve target strength/fatigue without over‑aging.

Common STA route for Ti-38-644 Bar:

Solution Treat: 730–790 °C (below or near β transus), hold based on diameter.
Quench: Water or fast air to retain β.
Age: 480–595 °C for 8–24 h; lower temperature → higher strength; higher temperature → better ductility/toughness.

Heat-treatment review notes for the governing product specification:

Verify β transus for each heat; use Jominy or equivalent response data if available.
For thick Ti-38-644 Bar, quench agitation and bath control improve uniformity.
Consider double‑aging for demanding fatigue regimes.

🧱 Forging & Hot Working Guidance

The existing forging guidance gives a 760–870 °C reference window. It is not a statement that forging stock is supplied to AMS 4957. Any forging route, temperature and subsequent treatment must follow the agreed specification and validated process.

Start in upper range for deformation; finish near lower range to refine grains.
Avoid extended soaking above transus to prevent grain coarsening.
Use controlled reductions per pass; reheat frequently to maintain window.

Cooling: Air cool to minimize oxygen pickup; maintain inert protection when feasible. Subsequent STA restores and elevates properties in finished Ti-38-644 Bar.

🧰 Machining Recommendations

Ti-38-644 Bar machines similarly to other high‑strength near‑β alloys:

Tooling: Sharp, positive‑rake carbide or advanced coated carbides; PVD coatings preferred to resist built‑up edge. For tight tolerances, CBN or ceramics in finishing.
Speeds/feeds: Reduce surface speed vs steels; maintain moderate‑high feed to keep tools engaged. Generous coolant (emulsion or straight oil) is vital.
Operations:
- Turning: Low SFM, steady feed, minimal dwell.
- Drilling: Split‑point or coolant‑through drills; peck cycles to break chips.
- Milling: Climb milling, rigid fixturing; avoid rubbing.
Burr control: Plan deburr steps; Ti can form tenacious burrs after heavy cuts.

Specify the required turned or ground finish, diameter tolerance and surface acceptance method. Confirm achievable limits for the actual size and condition before ordering.

🧲 Welding & Joining

Ti-38-644 Bar is weldable with the right discipline:

Processes: GTAW (TIG) and EBW are common; laser possible with tight shielding.
Shielding: High‑purity Ar; meticulous trailing and backside shielding to avoid α‑case and embrittlement.
Filler: Matching or compatible near‑β compositions.
Post-weld: agree the procedure, heat treatment and qualification requirements with the design authority. Do not assume that a post-weld STA cycle establishes AMS 4957 conformance.

🛡 Corrosion & Environmental Performance

General corrosion: Significantly better than high‑strength steels in many environments.
Chlorides: Typical titanium passivity; avoid crevice conditions when possible.
Galvanic: When coupled to carbon steel or copper alloys in electrolytes, insulate or manage area ratios.
Hydrogen: Prevent pickup during pickling/welding; follow AMS 4957 cleanliness and hydrogen limits for Ti-38-644 Bar.

🏗 Applications

Aerospace landing gear & attachment hardware requiring AMS 4957 pedigree
High‑strength fasteners & fittings where Ti-38-644 Bar replaces tempered steels
Engine pylons, hinge pins, actuators, and structural links
Defense & offshore components needing high specific strength and durability

Each of these areas benefits from the STA response and toughness profile of Ti-38-644 Bar.

Dimensions, Tolerances & Finishes — Catalogue Inquiry Options

Diameter programs: 10–200 mm typical; other diameters on request for Ti-38-644 Bar.
Lengths: Up to ~6 m (random) or cut‑to‑length; straightness per bar standards.
Tolerances: specify the required OD tolerance and turned, ground or polished finish. Applicability and capability must be confirmed for the agreed material specification.
Surface: As‑forged, rough‑turned, or TG&P Ti-38-644 Bar; Ra targets available for bearing/fit applications.

Specify the required heat/lot traceability and document scope; availability must be confirmed for the requested product and order.

🔍 Quality Assurance & Testing

Agree the inspection and manufacturing-record requirements for the actual product, applicable specification and delivery condition. Requirements to review can include:

Melt practice: Controlled remelting routes; chemistry and cleanliness verified.
Mechanical testing: Tensile at room (and when specified, elevated) temperatures.
NDT: state the ultrasonic method, class, coverage and acceptance criteria. Availability and technical applicability require confirmation.
Microstructural review: Confirm grain size and α precipitation after STA.
Documentation: request the required EN 10204 document type, heat identification, test results and statement for the specification actually agreed in the order.

⚖️ Density & Weight Calculation

The page’s 4.82 g/cm³ density is an unverified reference value for approximate logistics estimates. Confirm density where the application requires it. For a cylindrical round bar, use the diameter and length in mm in the following mass estimate:

Estimated mass (kg) = (π / 4) × d² (mm²) × L (mm) × 4.82 (g/cm³) / 1,000,000. Here d is the round-bar diameter and L is length; exclude machining allowances only when justified by the required dimensions.

This simplifies quoting and logistics for Ti-38-644 Bar cut pieces.

🧮 Property Tailoring via Heat Treatment

Because Ti-38-644 Bar is near‑β, modest heat‑treat changes yield big property shifts:

Lower aging (≈480–520 °C): Maximizes strength of Ti-38-644 Bar, slightly reduces ductility.
Higher aging (≈560–595 °C): Improves toughness and fatigue crack growth resistance.
Duplex or double aging: Fine‑tunes fatigue for rotating hardware.

Specify required furnace charts, quench records and manufacturing records with the order. Availability and applicability to the agreed specification must be confirmed.

🧩 Comparison with Other Titanium Alloys

Vs Ti‑6Al‑4V: Ti-3Al-8V-6Cr-4Mo-4Zr Bar reaches higher strength in large diameters; better hardenability; similar corrosion resistance.
Vs Ti‑10V‑2Fe‑3Al (Ti‑1023): Comparable strength potential; Ti-3Al-8V-6Cr-4Mo-4Zr Bar often chosen for fracture/fatigue balance.
Vs Ti‑5Al‑5V‑5Mo‑3Cr (Ti‑5553): Ti‑5553 is also near‑β; grade choice depends on availability and specific AMS requirements—AMS 4957 specifically covers Ti-3Al-8V-6Cr-4Mo-4Zr Bar.
Vs high‑strength steels: Far lower density and no red‑rust; desirable for aerospace weight targets.

🧼 Surface Conditioning & α‑Case Control

For Ti-38-644 Bar, α‑case forms if heated in oxygen. We mitigate via:

Inert/clean furnace atmospheres and wraps
Limited exposure times
Post‑process machining or pickling to remove any α‑case before final inspection per AMS 4957

🧯 Processing Hazards & Safety Notes

Titanium fines can be combustible—control chips and dust from machining Ti-3Al-8V-6Cr-4Mo-4Zr Bar.
Use dedicated tooling and clean work areas to avoid cross‑contamination.
Follow quench and furnace safety protocols rigorously.

🧾 Ordering Guide

Before requesting AMS 4957 material, confirm the required round-bar or wire form, size, solution-heat-treated/cold-drawn condition and any relevant provisions in the full specification. Use the existing ordering checklist below for the actual governing standard. Larger catalogue sizes and other processing states are separate requirements needing confirmation.

Prepare the material purchasing requirements, review GR5 Ti-6Al-4V AMS 4928 bar as a separate listing, or request a quotation. A different grade is not an automatic substitute.

When requesting a Ti-38-644 quotation, include the following and confirm any AMS 4957 applicability for the required form, size and condition:

Alloy & form: “Ti-3Al-8V-6Cr-4Mo-4Zr Bar”
Standard: provide the governing material specification and edition. Review AMS 4957 scope and any relevant full-specification provisions for the requested form and size.
Condition: state the required delivery condition. As-forged, turned, STA and solution-heat-treated/cold-drawn requirements must be reviewed separately against the governing specification.
Dimensions: OD and cut length (or random)
Testing: UT, tensile frequency, any elevated‑temp tests
Documentation: EN 10204 3.1 (or 3.2), special approvals
End use: Aerospace/industrial (helps align inspection plans)

The quotation and order must confirm the product form, size, delivery condition, acceptance requirements and documents. An inquiry checklist alone does not establish material conformance.

📦 Packaging & Logistics

Bar ends protected with caps; bundles strapped and tagged with heat/lot IDs.
Corrosion‑inhibiting wraps as needed.
Export crates for long Ti-3Al-8V-6Cr-4Mo-4Zr Bar lengths; ISPM‑15 pallets.
Documentation packet: confirm the requested COA/MTC, dimensional report and statement for the specification agreed in the order.

🧠 Engineering FAQ

Q1: Is Ti-38-644 the same as Beta-C? A: Ti-38-644 and Beta-C refer here to Ti-3Al-8V-6Cr-4Mo-4Zr. That alloy identity does not establish that every listed size, form or condition conforms to AMS 4957.

Q2: What density should I use?
A: Use ~4.82 g/cm³ for it weight and inertia estimates.

Q3: Which heat‑treat gives the highest strength?
A: A lower‑temperature age after proper solution treat & quench typically yields the highest YS/UTS ; verify with your section size.

Q4: Can I weld this alloy? A: Welding and any post-weld treatment require a qualified procedure for the actual condition and component. A post-weld STA cycle is not an automatic AMS 4957 compliance statement.

Q5: How does it compare with Ti‑6Al‑4V?
A: Ti-38-644 Bar achieves higher strength in larger diameters and offers excellent fatigue; Ti‑6Al‑4V is more ubiquitous and easier to source fast.

Q6: Can ultrasonic testing be specified? A: Provide the method, acceptance class, coverage and reporting requirements for technical review and quotation. Confirm the inspection scope before ordering.

Q7: Can I request short sample lengths? A: Send size, quantity, condition and traceability requirements. Sample availability and applicable material documents require confirmation.

Q8: What determines lead time? A: Size, quantity, delivery condition, inspection and document requirements affect timing. Confirm stock status and production/delivery dates in the quotation.

📈 Case Uses & Design Notes

Landing gear pins: review weight, strength and fatigue requirements with the design authority. Use approved size/condition data and the governing specification rather than assuming the listed catalogue meets AMS 4957.
Actuator shafts & links: STA Ti-38-644 Bar sustains cyclic loads with favorable fatigue crack growth rates.
Precision fasteners: Where high clamp load and corrosion resistance are required, Ti-38-644 Bar is a strong candidate.

🔗 Related Products (Internal)

📝 Summary for Buyers

For Ti-38-644 Beta-C bar, send product form, diameter, length, quantity, delivery condition, governing material standard and inspection plan. The quotation must confirm the actual supply scope, material documents and delivery; no aerospace approval or blanket AMS 4957 conformity is implied by this listing.

📞 Contact Us

📧 Email: sales@niticu.com
📞 Phone / WhatsApp / WeChat: +86 13335373172
🏭 Factory: Baotai Road Industrial Park, High-tech Zone, Baoji City, Shaanxi, China
🌐 Website: https://niticu.com

Send your size, condition and material requirements for pricing and delivery review.

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