{"id":3603,"date":"2026-09-16T11:06:15","date_gmt":"2026-09-16T08:06:15","guid":{"rendered":"https:\/\/www.defencemetal.com\/index.php\/en\/ti-grade-5-eli\/"},"modified":"2026-09-25T16:27:47","modified_gmt":"2026-09-25T13:27:47","slug":"ti-grade-5-eli","status":"publish","type":"page","link":"https:\/\/www.defencemetal.com\/index.php\/en\/ti-grade-5-eli\/","title":{"rendered":"Ti Grade 5 ELI"},"content":{"rendered":"

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Ti Grade 5 ELI \/ UNS R56401<\/h1>\n
DEFENCE METAL<\/span><\/p>\n
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Ti Grade 5 ELI (ASTM Grade 23 \u00b7 Ti-6Al-4V ELI)<\/div>\n
ASTM Grade 23 \u00b7 Ti-6Al-4V ELI (Extra Low Interstitial) \u00b7 UNS R56407 (ASTM B265 \/ B348 Grade 23) and UNS R56401 (ASTM F136, surgical implants) \u00b7 W.Nr. 3.7165 \u00b7 ALPHA-BETA (two-phase) titanium alloy. IT IS THE SAME ALLOY AS GRADE 5; the difference lies in the interstitial ceilings. ASTM B265 \/ B348 Grade 23 limits: Al 5.5-6.5% \u00b7 V 3.5-4.5% \u00b7 O 0.13% max \u00b7 Fe 0.25% max \u00b7 N 0.03% max \u00b7 C 0.08% max \u00b7 H 0.0125% max \u00b7 balance Ti. Density 4.42 g\/cm3. It is supplied in the annealed condition.<\/div>\n
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Not to be confused with<\/div>\n

Ti Grade 5<\/a><\/div>\n<\/div>\n

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For what<\/div>\n
It is bought where fracture toughness, fatigue crack growth resistance and low-temperature ductility come before strength: hip and knee prostheses, spinal implants, bone screws and plates, dental implants, surgical instruments; cryogenic service parts;<\/div>\n<\/div>\n
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Forms<\/div>\n
Round bar \u00b7 flat bar \u00b7 plate \u00b7 sheet \u00b7 tube \u00b7 forgings. All forms are supplied to order.<\/div>\n<\/div>\n
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Standards<\/div>\n
AMS (verified by four or more independent sources): 4907 – ELI sheet, strip and plate, annealed \u00b7 4930 – ELI bars, wire, forgings and rings, annealed \u00b7 6932 – ELI bars, forgings and forging stock, annealed. Military equivalents: AMS-T-9046 \/ MIL-T-9046 Type AB-2 (ELI sheet, strip, plate) \u00b7 AMS-T-9047 ELI (bars). ASTM: B265 \/ ASME SB-265 Grade 23 (strip, sheet, plate; UNS R56407) \u00b7 B348 \/ ASME SB-348 Grade 23 (bars and billets; UNS R56407) \u00b7 B381 Grade F-23 (forgings) \u00b7 F136 (surgical implants, UNS R56401). Welding: ERTi-23 (ELI) rod to AWS A5.16 \/ ASME SFA-5.16.
NAMING – THERE IS NO ASTM CLASS CALLED ‘Ti GRADE 5 ELI’. In ASTM the extra-low-interstitial class is GRADE 23. Four independent records confirm this: (1) ASTM International’s own scope text for ASTM B348\/B348M reads ‘Grade 23-UNS R56407.<\/span><\/div>\n<\/div>\n
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Advantage<\/div>\n
Lowering all the interstitial ceilings together within the same alloy. Against Grade 5 the oxygen ceiling falls from 0.20% to 0.13% (-35%), iron from 0.40% to 0.25% (-37.5%), nitrogen from 0.05% to 0.03% (-40%) and hydrogen from 0.015% to 0.0125% (-17%).<\/div>\n<\/div>\n
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Welding<\/div>\n
Filler metal: ERTi-23 (ELI) rod to AWS A5.16 \/ ASME SFA-5.16. TWI reports that ELI filler metals are used to gain ductility and toughness in the weld metal, and that on alpha-beta alloys unalloyed filler serves the same end by reducing the amount of beta phase. PREHEAT IS NOT REQUIRED.<\/div>\n<\/div>\n
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Limits<\/div>\n
IT IS NOT CHOSEN FOR STRENGTH. The ASTM B265 \/ B348 floors are below those of Grade 5 (828 \/ 759 MPa against 895 \/ 828 MPa); on a drawing that calls for a high yield, ELI is the wrong choice. ELI IS SUPPLIED ANNEALED: all three verified ELI AMS specifications (4907, 4930, 6932) describe the ANNEALED condition.<\/div>\n<\/div>\n
REQUEST A QUOTE<\/a>All titanium alloys →<\/a>TECHNICAL DETAILS ↓<\/span><\/div>\n
Compiled from manufacturer data sheets \u00b7 confirm against the current specification before ordering<\/div>\n<\/div>\n<\/div>\n

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