{"id":3607,"date":"2026-09-16T11:06:29","date_gmt":"2026-09-16T08:06:29","guid":{"rendered":"https:\/\/www.defencemetal.com\/index.php\/en\/ti-grade-4\/"},"modified":"2026-09-25T16:27:36","modified_gmt":"2026-09-25T13:27:36","slug":"ti-grade-4","status":"publish","type":"page","link":"https:\/\/www.defencemetal.com\/index.php\/en\/ti-grade-4\/","title":{"rendered":"Ti Grade 4"},"content":{"rendered":"

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Ti Grade 4 \/ UNS R50700 \/ AMS 4901 \/ AMS 4921<\/h1>\n
DEFENCE METAL<\/span><\/p>\n
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Ti Grade 4<\/div>\n
UNS R50700 \u00b7 W.Nr. 3.7065 \u00b7 DIN 17850 Ti 4 \u00b7 ASTM Grade 4 \u00b7 COMMERCIALLY PURE (unalloyed) titanium, alpha phase. Ceilings: O 0.40% max \u00b7 Fe 0.50% max \u00b7 N 0.05% max \u00b7 C 0.08% max \u00b7 H 0.015% max \u00b7 each other element 0.10% max \u00b7 other elements total 0.40% max \u00b7 balance Ti. It is the STRONGEST grade of the commercially pure family; all of that strength comes from raising the oxygen, iron and nitrogen ceilings. IT DOES NOT PRECIPITATION HARDEN AND IT DOES NOT QUENCH HARDEN: it is single-phase alpha.<\/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 the corrosion behaviour of unalloyed titanium must be kept but Grade 2 cannot carry the load: dental implants and bone screws, surgical plates, airframe fasteners and clamps, cryogenic vessels, high-strength chemical process parts and pickling baskets.<\/div>\n<\/div>\n
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Forms<\/div>\n
Round bar \u00b7 plate \u00b7 sheet \u00b7 strip \u00b7 forgings \u00b7 wire. All forms are supplied to order.<\/div>\n<\/div>\n
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Standards<\/div>\n
AMS (verified): 4901 – sheet, strip and plate; commercially pure, annealed, 70.0 ksi (485 MPa) yield strength \u00b7 4921 – bars, wire, forgings, flash welded rings and forging\/ring stock up to 101.60 mm nominal diameter; commercially pure, 70 ksi (483 MPa) yield. ASTM: B265 \/ SB-265 (strip, sheet, plate) \u00b7 B348 \/ SB-348 (bars and billets) \u00b7 B381 Grade F-4 (forgings) \u00b7 B863 (wire) \u00b7 F67 Grade 4 (unalloyed titanium for surgical implants). EN \/ DIN: DIN 17850 Ti 4 (composition, W.Nr. 3.7065) \u00b7 DIN 17860 (sheet\/plate) \u00b7 DIN 17862 (bar) \u00b7 DIN 17864 (forgings). MIL: MIL-T-9046H Type 1 Composition B and MIL-T-9046J CP-1 (sheet, strip, plate) \u00b7 MIL-T-9047G \/ AMS-T-9047A CP-70 (bar). Welding: AWS A5.16 \/ SFA-5.16 ERTi-4.
THE MIL-T-9046 \/ AMS-T-9046 CP NUMBERS RUN OPPOSITE TO THE ASTM GRADE NUMBERS: CP-1 = Grade 4 \u00b7 CP-2 = Grade 3 \u00b7 CP-3 = Grade 2 \u00b7 CP-4 = Grade 1. If an old drawing says ‘CP-1’, that is Grade 4, not Grade 1.<\/span><\/div>\n<\/div>\n
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Advantage<\/div>\n
Strength gained while staying unalloyed. The minimum tensile strength is 550 MPa and the minimum yield strength is 483 MPa – 59% and 76% above Grade 2 respectively – and it is obtained without adding any alloying element such as aluminium or vanadium.<\/div>\n<\/div>\n
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Welding<\/div>\n
Filler metal: matching commercially pure rod to AWS A5.16 \/ ASME SFA-5.16 – ERTi-1 for Grade 1, ERTi-2 for Grade 2, ERTi-4 for Grade 4. Preheat is NOT required and post-weld heat treatment is not mandatory (Corrosion Materials).<\/div>\n<\/div>\n
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Limits<\/div>\n
IT DOES NOT HARDEN BY HEAT TREATMENT. There is no quenching, no solution treatment and no ageing; when a drawing calls for a hardness value, this grade is the wrong choice. FORBIDDEN BAND – ABOVE 590-620 \u00b0C IN AIR: annealing or hot forming in air above this temperature produces oxide scale and a diffused-in oxygen layer (alpha case);<\/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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