{"id":966,"date":"2026-10-09T09:21:14","date_gmt":"2026-10-09T09:21:14","guid":{"rendered":"https:\/\/daix488.sg-host.com\/?post_type=product&p=966"},"modified":"2026-10-20T07:55:53","modified_gmt":"2026-10-20T07:55:53","slug":"astm-b348-grade-4-titanium-rod","status":"publish","type":"product","link":"https:\/\/www.htn-ti.com\/fr\/product\/astm-b348-grade-4-titanium-rod\/","title":{"rendered":"ASTM B348 Grade 4 Titanium Rod"},"content":{"rendered":"\t\t
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Product Overview<\/h2>\t\t\t\t<\/div>\n\t\t
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ASTM B348 Grade 4 titanium rod (titanium bar) is an unalloyed, commercially pure titanium bar produced and tested to ASTM B348. Its UNS designation is R50700. Material performance is developed by controlling oxygen, iron, nitrogen, carbon and hydrogen, together with hot working, annealing and grain condition.<\/p>

Grade 4 is the highest-strength commercially pure titanium grade among Grades 1 to 4 in ASTM B348. It provides greater load-carrying capability than Grades 1, 2 and 3, with a corresponding reduction in ductility, cold-forming latitude and processing adaptability. Grade 4 is suited to engineering parts requiring higher strength together with good weldability and excellent corrosion resistance.<\/p>

Grade 4 rod\/bar is used for higher-strength corrosion-resistant fasteners, shafts, valve stems, flanges, connectors, pump components, electrode substrates and heat-exchanger parts in chemical processing, desalination, marine, chlor-alkali, electroplating, energy and general industrial equipment.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t

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Specification<\/strong><\/td>Details<\/strong><\/td><\/tr>
Industrial Standard<\/strong><\/td>ASTM B348<\/td><\/tr>
Industrial Grades<\/strong><\/td>Gr4<\/td><\/tr>
Diameter Range<\/strong><\/td>\u00d87 \u2013 \u00d8300 mm<\/td><\/tr>
Typical Diameters<\/strong><\/td>\u00d87, 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 45, 50, 60, 70, 80, 90, 100, 120, 150, 200 mm<\/td><\/tr>
Typical Industrial Bar Length<\/strong><\/td>200\u20133000 mm; cut-to-length available<\/td><\/tr>
Surface \/ Supply Condition<\/strong><\/td>Hot-rolled black surface \/ Turned \/ Ground<\/td><\/tr>
Precision Tolerance<\/strong><\/td>h6 \/ h7 \/ h8 available subject to diameter, finishing process and order confirmation<\/td><\/tr><\/tbody><\/table><\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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Main Characteristics<\/h3>\t\t\t\t<\/div>\n\t\t\t\t
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  • Highest strength among CP titanium Grades 1-4:<\/strong> The room-temperature minimum tensile strength is 550 MPa, the minimum 0.2% offset yield strength is 483 MPa, and the minimum specified elongation is 15%, supporting corrosion-resistant parts with higher load-carrying requirements.<\/li>
  • Excellent corrosion resistance:<\/strong> A continuous, adherent titanium-oxide passive film forms naturally and can repassivate when oxygen or moisture is present.<\/li>
  • High strength-to-weight potential:<\/strong> Density is approximately 4.51 g\/cm\u00b3. Its strength can be comparable with some annealed stainless steels at substantially lower weight.<\/li>
  • Hot and cold workability:<\/strong> Grade 4 may be forged, rolled, extruded, drawn, bent, stamped, spun and machined. Its higher strength and work-hardening response provide less cold-forming latitude than Grades 1-3.<\/li>
  • Good weldability:<\/strong> TIG, MIG, plasma, laser and electron-beam processes may be used with complete inert-gas protection of all hot metal.<\/li>
  • Good low-temperature behavior:<\/strong> CP titanium retains useful ductility and toughness at low temperatures.<\/li>
  • Essentially non-magnetic:<\/strong> This can be useful in equipment sensitive to magnetic response.<\/li>
  • Not significantly strengthened by conventional heat treatment:<\/strong> Annealing is used mainly for stress relief, ductility recovery and microstructural stabilization.<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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    Chemical Composition<\/h3>\t\t\t\t<\/div>\n\t\t\t\t
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    ASTM B348 Grade 4 chemistry is controlled to the following mass-percent limits:<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t

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    Element<\/strong><\/td>ASTM B348 Grade 4 requirement<\/strong><\/td><\/tr>
    Nitrogen, N<\/strong><\/td>\u22640.050%<\/td><\/tr>
    Carbon, C<\/strong><\/td>\u22640.080%<\/td><\/tr>
    Hydrogen, H<\/strong><\/td>\u22640.015%<\/td><\/tr>
    Oxygen, O<\/strong><\/td>\u22640.400%<\/td><\/tr>
    Iron, Fe<\/strong><\/td>\u22640.500%<\/td><\/tr>
    Residual elements, each<\/strong><\/td>\u22640.100%<\/td><\/tr>
    Residual elements, total<\/strong><\/td>\u22640.400%<\/td><\/tr>
    Titanium, Ti<\/strong><\/td>Balance<\/td><\/tr><\/tbody><\/table><\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t
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    • Technical references:<\/strong> ASTM B348\/B348M, Carpenter Technology CP Ti Grade 4 data and related Grade 4 product data.<\/li>
    • Oxygen and iron:<\/strong> Important strength-controlling elements in CP titanium; higher levels generally increase strength and hardness but may reduce ductility and formability.<\/li>
    • Hydrogen:<\/strong> Must be controlled because excessive pickup can form brittle hydrides and increase embrittlement risk.<\/li>
    • Titanium content:<\/strong> ASTM states Titanium: Balance. Grade 4 should not be simplified to a fixed claim such as \u201cTi \u226599.5%.\u201d<\/li>
    • Lot acceptance:<\/strong> Final chemistry shall be confirmed by the original mill test report for the applicable heat.<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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      Mechanical Requirements<\/h3>\t\t\t\t<\/div>\n\t\t\t\t
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      The following room-temperature tensile requirements apply to annealed ASTM B348 Grade 4 bar. The specified edition, dimensions, specimen form and test orientation must also be considered for formal acceptance.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t

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      Property<\/strong><\/td>Requirement<\/strong><\/td>Status<\/strong><\/td><\/tr>
      Ultimate tensile strength, Rm<\/strong><\/td>\u2265550 MPa<\/td>ASTM minimum<\/td><\/tr>
      0.2% offset yield strength, Rp0.2<\/strong><\/td>\u2265483 MPa<\/td>ASTM minimum<\/td><\/tr>
      Elongation in the specified gauge length<\/strong><\/td>\u226515%<\/td>ASTM minimum<\/td><\/tr>
      Reduction of area<\/strong><\/td>\u226525%<\/td>ASTM minimum<\/td><\/tr><\/tbody><\/table><\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t
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      Typical Room-Temperature Properties (Not Guaranteed)<\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t

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      Property<\/strong><\/td>Reference Value<\/strong><\/td><\/tr>
      Ultimate tensile strength<\/strong><\/td>Approx. 655\u2013690 MPa<\/td><\/tr>
      0.2% offset yield strength<\/strong><\/td>Approx. 480\u2013635 MPa<\/td><\/tr>
      Elongation<\/strong><\/td>Approx. 20\u201325%<\/td><\/tr>
      Reduction of area<\/strong><\/td>Approx. 38\u201351%<\/td><\/tr>
      Elastic modulus<\/strong><\/td>Approx. 105 GPa<\/td><\/tr>
      Typical bend radius<\/strong><\/td>Evaluate for part design, dimensions and forming route<\/td><\/tr><\/tbody><\/table><\/div>

      Important:<\/strong> Typical data are not ASTM acceptance values and are not automatically guaranteed for every lot. Hardness is not a universal core acceptance criterion for ASTM B348 Grade 4. If hardness, fatigue or bend performance is required, it should be stated separately in the purchase order.<\/p><\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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      HTN Supply and Quality Services<\/h3>\t\t\t\t<\/div>\n\t\t\t\t
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      ASTM B348 Grade 4 titanium bar is produced by evaluated, qualified mill resources. HTN confirms technical requirements from customer drawings and purchase specifications, selects a mill with the appropriate capability, reviews the original MTR and heat\/lot records, and verifies the relationship among the material standard, dimensions, quantity, condition and inspection documents.<\/p>

      When agreed in the contract, HTN can coordinate independent retesting, ultrasonic examination, PMI, cut-to-length service, turning or grinding, EN 10204 3.1 documentation and third-party inspection, together with export packing, shipping documents and international delivery.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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      Typical Applications<\/h3>\t\t\t\t<\/div>\n\t\t\t\t
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      • Higher-strength shafts, valve stems, flanges, fasteners and connectors for chemical equipment;<\/li>
      • Components for heat exchangers, condensers, evaporators and reactors;<\/li>
      • Desalination, shipboard and marine-engineering equipment;<\/li>
      • Pump shafts, impeller or support components and corrosion-resistant machined parts;<\/li>
      • Chlor-alkali, electroplating and electrochemical equipment;<\/li>
      • Petrochemical, energy and general industrial equipment;<\/li>
      • Aircraft brackets, duct accessories and secondary structures where the applicable specification is satisfied;<\/li>
      • Engineering parts requiring light weight, corrosion resistance and the highest strength of the common CP titanium grades.<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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        Request a Quote<\/div>\t\t\t\t<\/div>\n\t\t\t\t
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        Fill in the form below and our team will be happy to assist you<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t

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