{"id":5697,"date":"2025-12-24T01:03:32","date_gmt":"2025-12-24T01:03:32","guid":{"rendered":"https:\/\/korea-transmission.com\/?p=5697"},"modified":"2025-12-24T01:03:32","modified_gmt":"2025-12-24T01:03:32","slug":"gb-t-3098-16-stainless-steel-set-screws-properties","status":"publish","type":"post","link":"https:\/\/korea-transmission.com\/ms\/blog\/gb-t-3098-16-stainless-steel-set-screws-properties\/","title":{"rendered":"GB\/T 3098.16: Ciri-ciri Skru Set Keluli Tahan Karat"},"content":{"rendered":"

Introduction to the GB\/T 3098.16 Standard<\/h2>\n
\n

This standard specifies the mechanical properties of stainless steel set screws and similar non-tensile fasteners, focusing on austenitic grades. It ensures reliability in corrosive environments, such as marine or chemical applications, by defining chemical compositions and performance criteria. Compliance with GB\/T 3098.16-2014 guarantees fasteners withstand operational stresses without failure.<\/p>\n

Engineers should reference this for selecting materials that balance corrosion resistance and mechanical strength, preventing issues like intergranular corrosion through appropriate alloy choices.<\/p>\n<\/div>\n

Komposisi Kimia<\/h2>\n
\n

The chemical composition for austenitic stainless steel groups used in set screws is outlined in Table 2, consistent with GB\/T 3098.6-2014. Manufacturers select within specified ranges unless otherwise agreed. For intergranular corrosion-prone applications, test per GB\/T 4334 and prefer stabilized A3\/A5 or low-carbon (\u22640.03%) A2\/A4 groups.<\/p>\n

    \n
  • Compositions maximize corrosion resistance while maintaining formability.<\/li>\n
  • Adjustments like sulfur substitution with selenium enhance machinability in A1 group.<\/li>\n
  • Stabilization with titanium or niobium prevents carbide precipitation.<\/li>\n<\/ul>\n
    \n\n\n\n\n\n\n\n\n\n\n
    Jenis<\/th>\nKumpulan<\/th>\nChemical Composition (mass fraction) \/ %seorang<\/sup><\/th>\nNota<\/th>\n<\/tr>\n
    C<\/th>\nSi<\/th>\nMn<\/th>\nP<\/th>\nS<\/th>\nCr<\/th>\nBulan<\/th>\nNi<\/th>\nCu<\/th>\n<\/tr>\n<\/thead>\n
    Austenitik<\/td>\nA1<\/td>\n0.12<\/td>\n1<\/td>\n6.5<\/td>\n0.2<\/td>\n0.15\uff5e0.35<\/td>\n16\uff5e19<\/td>\n0.7<\/td>\n5\uff5e10<\/td>\n1.75\uff5e2.25<\/td>\nb, c, d<\/td>\n<\/tr>\n
    A2<\/td>\n0.1<\/td>\n1<\/td>\n2<\/td>\n0.05<\/td>\n0.03<\/td>\n15\uff5e20<\/td>\n\u2014e<\/sup><\/td>\n8\uff5e19<\/td>\n4<\/td>\nf, g<\/td>\n<\/tr>\n
    A3<\/td>\n0.08<\/td>\n1<\/td>\n2<\/td>\n0.045<\/td>\n0.03<\/td>\n17\uff5e19<\/td>\n\u2014e<\/sup><\/td>\n9\uff5e12<\/td>\n1<\/td>\nh<\/td>\n<\/tr>\n
    A4<\/td>\n0.08<\/td>\n1<\/td>\n2<\/td>\n0.045<\/td>\n0.03<\/td>\n16\uff5e18.5<\/td>\n2\uff5e3<\/td>\n10\uff5e15<\/td>\n4<\/td>\ng, i<\/td>\n<\/tr>\n
    A5<\/td>\n0.08<\/td>\n1<\/td>\n2<\/td>\n0.045<\/td>\n0.03<\/td>\n16\uff5e18.5<\/td>\n2\uff5e3<\/td>\n10.5\uff5e14<\/td>\n1<\/td>\nh, i<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

    seorang<\/sup> Maximum values unless stated otherwise.<\/p>\n

    b<\/sup> Sulfur boleh digantikan dengan selenium.<\/p>\n

    c<\/sup> If nickel content is below 8%, minimum manganese content shall be 5%.<\/p>\n

    d<\/sup> Jika kandungan nikel melebihi 8%, tiada kandungan kuprum minimum dinyatakan.<\/p>\n

    e<\/sup> Molybdenum content may be added at manufacturer’s discretion; specify limits if needed.<\/p>\n

    f<\/sup> If chromium content is below 17%, minimum nickel content shall be 12%.<\/p>\n

    g<\/sup> For stainless steel with maximum carbon 0.03%, nitrogen may reach 0.22%.<\/p>\n

    h<\/sup> For stabilization, titanium \u2265 (5\u00d7C%) to 0.8%, or niobium\/tantalum \u2265 (10\u00d7C%) to 1.0%.<\/p>\n

    saya<\/sup> For larger diameters, carbon may increase to 0.12% to achieve properties.<\/p>\n<\/div>\n

    Sifat Mekanikal<\/h2>\n
    \n

    Keperluan Am<\/h3>\n

    Set screws must meet values in Tables 3 and 4 for acceptance. These properties ensure durability under torque and hardness demands in assembly applications.<\/p>\n

      \n
    1. Verify via specified tests for consistent performance.<\/li>\n
    2. Applicable to hardness classes 12H and 21H.<\/li>\n<\/ol>\n<\/div>\n
      \n

      Guaranteed Torque for Socket Set Screws<\/h3>\n

      Socket set screws comply with minimum torque in Table 3, tested at specified lengths to simulate real-world use.<\/p>\n

      \n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
      Nominal Thread Diameter d<\/th>\nMinimum Test Lengthseorang<\/sup> \/ mm<\/th>\nHardness Class<\/th>\n<\/tr>\n
      <\/th>\nFlat Point<\/th>\nCone Point<\/th>\nDog Point<\/th>\nCup Point<\/th>\n12H<\/th>\n21H<\/th>\n<\/tr>\n<\/thead>\n
      1.6<\/td>\n2.5<\/td>\n3<\/td>\n3<\/td>\n2.5<\/td>\n0.03<\/td>\n0.05<\/td>\n<\/tr>\n
      2<\/td>\n4<\/td>\n4<\/td>\n4<\/td>\n3<\/td>\n0.06<\/td>\n0.1<\/td>\n<\/tr>\n
      2.5<\/td>\n4<\/td>\n4<\/td>\n5<\/td>\n4<\/td>\n0.18<\/td>\n0.3<\/td>\n<\/tr>\n
      3<\/td>\n4<\/td>\n5<\/td>\n6<\/td>\n5<\/td>\n0.25<\/td>\n0.42<\/td>\n<\/tr>\n
      4<\/td>\n5<\/td>\n6<\/td>\n8<\/td>\n6<\/td>\n0.8<\/td>\n1.4<\/td>\n<\/tr>\n
      5<\/td>\n6<\/td>\n8<\/td>\n8<\/td>\n6<\/td>\n1.7<\/td>\n2.8<\/td>\n<\/tr>\n
      6<\/td>\n8<\/td>\n8<\/td>\n10<\/td>\n8<\/td>\n3<\/td>\n5<\/td>\n<\/tr>\n
      8<\/td>\n10<\/td>\n10<\/td>\n12<\/td>\n10<\/td>\n7<\/td>\n12<\/td>\n<\/tr>\n
      10<\/td>\n12<\/td>\n12<\/td>\n16<\/td>\n12<\/td>\n14<\/td>\n24<\/td>\n<\/tr>\n
      12<\/td>\n16<\/td>\n16<\/td>\n20<\/td>\n16<\/td>\n25<\/td>\n42<\/td>\n<\/tr>\n
      16<\/td>\n20<\/td>\n20<\/td>\n25<\/td>\n20<\/td>\n63<\/td>\n105<\/td>\n<\/tr>\n
      20<\/td>\n25<\/td>\n25<\/td>\n30<\/td>\n25<\/td>\n126<\/td>\n210<\/td>\n<\/tr>\n
      24<\/td>\n30<\/td>\n30<\/td>\n35<\/td>\n30<\/td>\n200<\/td>\n332<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

      seorang<\/sup> Minimum length corresponds to at least one full socket depth as per product standards.<\/p>\n<\/div>\n

      \n

      Keperluan Kekerasan<\/h3>\n

      Set screws must achieve hardness levels in Table 4, critical for wear resistance and load-bearing capacity.<\/p>\n

      \n\n\n\n\n\n\n\n\n
      Kekerasan<\/th>\nHardness Class<\/th>\n<\/tr>\n
      12H<\/th>\n21H<\/th>\n<\/tr>\n<\/thead>\n
      Kekerasan Vickers HV<\/td>\n125\uff5e209<\/td>\n\u2265210<\/td>\n<\/tr>\n
      Brinell Hardness HB<\/td>\n123\uff5e213<\/td>\n\u2265214<\/td>\n<\/tr>\n
      Rockwell Hardness HRB<\/td>\n70\uff5e95<\/td>\n\u226596<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
      \n

      Hardness Testing<\/h3>\n

      Conduct tests per GB\/T 231.1 (HB), GB\/T 230.1 (HRB), or GB\/T 4340.1 (HV). In disputes, use Vickers as basis. Follow procedures from GB\/T 3098.3 for accuracy.<\/p>\n

        \n
      • Ensure surface preparation avoids altering results.<\/li>\n
      • Test multiple points for uniformity in production batches.<\/li>\n<\/ul>\n<\/div>\n

        Appendices<\/h2>\n
        \n

        Appendix B: Austenitic Stainless Steel Compositions (from ISO 683-13:1986)<\/h3>\n

        This informative appendix provides detailed compositions for austenitic steels, aiding in material selection for specific environments.<\/p>\n

        \n\n\n\n\n\n\n\n
        Jenis Keluliseorang<\/sup><\/th>\nKomposisi Kimiab<\/sup> (mass fraction) \/ %<\/th>\nGroup Designationd<\/sup><\/th>\n<\/tr>\n
        C<\/th>\nSi max<\/th>\nMn max<\/th>\nP maks<\/th>\nS<\/th>\nN<\/th>\nCr<\/th>\nBulan<\/th>\nNb<\/th>\nNic<\/sup><\/th>\nSe min<\/th>\nTi<\/th>\nCu<\/th>\n<\/tr>\n<\/thead>\n
        10<\/td>\n0.030 max<\/td>\n1<\/td>\n2<\/td>\n0.045<\/td>\n0.030 max<\/td>\n\u2014<\/td>\n17.0\uff5e19.0<\/td>\n\u2014<\/td>\n\u2014<\/td>\n9.0\uff5e12.0<\/td>\n\u2014<\/td>\n\u2014<\/td>\n\u2014<\/td>\nA2e<\/sup><\/td>\n<\/tr>\n

        <\/p>\n

        19aN<\/td>\n0.030 max<\/td>\n1<\/td>\n2<\/td>\n0.045<\/td>\n0.030 max<\/td>\n0.12\uff5e0.22<\/td>\n16.5\uff5e18.5<\/td>\n2.5\uff5e3.0<\/td>\n\u2014<\/td>\n11.5\uff5e14.5<\/td>\n\u2014<\/td>\n\u2014<\/td>\n\u2014<\/td>\nA4e<\/sup><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

        Notes from appendix: Type numbers are provisional; no additions of unlisted elements without agreement; prevent scrap contamination.<\/p>\n<\/div>\n

        \n

        Appendix C: Austenitic Stainless Steels for Cold Heading and Extruding (from ISO 4954:1993)<\/h3>\n

        This appendix lists compositions optimized for cold forming processes, ensuring workability without compromising strength.<\/p>\n

        \n\n\n\n\n\n\n\n
        Steel Type Designationseorang<\/sup><\/th>\nKomposisi Kimiab<\/sup> (mass fraction) \/ %<\/th>\nGroup Designationc<\/sup><\/th>\n<\/tr>\n
        Tidak.<\/th>\nNama<\/th>\nISO 4954:1979<\/th>\nC<\/th>\nSi max<\/th>\nMn max<\/th>\nP maks<\/th>\nS maks<\/th>\nCr<\/th>\nBulan<\/th>\nNi<\/th>\nLain-lain<\/th>\n<\/th>\n<\/tr>\n<\/thead>\n
        78<\/td>\nX 2 CrNi 18 10 E<\/td>\nD20<\/td>\n\u22640.030<\/td>\n1<\/td>\n2<\/td>\n0.045<\/td>\n0.03<\/td>\n17.0\uff5e19.0<\/td>\n\u2014<\/td>\n9.0\uff5e12.0<\/td>\n\u2014<\/td>\nA2d<\/sup><\/td>\n<\/tr>\n

        <\/p>\n

        88<\/td>\nX 3 CrNiCu 18 9 3 E<\/td>\nD32<\/td>\n\u22640.04<\/td>\n1<\/td>\n2<\/td>\n0.045<\/td>\n0.03<\/td>\n17.0\uff5e19.0<\/td>\n\u2014<\/td>\n8.5\uff5e10.5<\/td>\nCu:3.00\uff5e4.00<\/td>\nA2<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

        Notes: Designations include sequential numbers and ISO names; no unlisted element additions; prevent contamination for optimal properties.<\/p>\n<\/div>\n

        \n

        Appendix E: Relative Magnetic Permeability of Austenitic Stainless Steels<\/h3>\n

        For magnetic-sensitive applications, consult metallurgists. Austenitic steels are non-magnetic in solution-annealed state but may become magnetic after cold working. Relative permeability \u03bcr<\/sub> measures magnetization; values near 1 indicate low permeability.<\/p>\n

          \n
        • Example: A2: \u03bcr<\/sub> \u22481.8<\/li>\n
        • A4: \u03bcr<\/sub> \u22481.015<\/li>\n
        • A4L: \u03bcr<\/sub> \u22481.005<\/li>\n
        • F1: \u03bcr<\/sub> \u22485<\/li>\n<\/ul>\n

          Use in electronics or medical devices where low magnetism is essential.<\/p>\n<\/div>\n

          Soalan Lazim<\/h2>\n
          \n

          What stainless steel group is recommended for intergranular corrosion resistance?<\/h3>\n

          Prefer stabilized A3 or A5 groups, or low-carbon A2\/A4 with \u22640.03% carbon. Test per GB\/T 4334 to confirm suitability in aggressive environments.<\/p>\n<\/div>\n

          \n

          How does cold working affect magnetic properties of set screws?<\/h3>\n

          Cold deformation can induce magnetism in austenitic steels. Select low-permeability grades like A4L for applications requiring non-magnetic fasteners.<\/p>\n<\/div>\n

          \n

          What if hardness test results fall outside Table 4 ranges?<\/h3>\n

          Reject the batch as it may indicate improper heat treatment. Retest using Vickers method as the arbiter and investigate manufacturing processes.<\/p>\n<\/div>\n

          \n

          Can chemical compositions be adjusted beyond Table 2?<\/h3>\n

          Only by agreement between buyer and manufacturer. Unauthorized changes risk compromising corrosion resistance or mechanical integrity.<\/p>\n<\/div>\n

          \n

          Why specify minimum test lengths for torque testing?<\/h3>\n

          To ensure full socket engagement, simulating actual use and preventing premature failure due to inadequate grip during installation.<\/p>\n<\/div>\n

          \n

          How to choose between 12H and 21H hardness classes?<\/h3>\n

          12H for general corrosion-resistant applications; 21H for higher strength needs, like vibration-prone assemblies, balancing toughness and hardness.<\/p>\n<\/div>\n

           <\/p>","protected":false},"excerpt":{"rendered":"

          Introduction to the GB\/T 3098.16 Standard This standard specifies the mechanical properties of stainless steel set screws and similar non-tensile fasteners, focusing on austenitic grades. It ensures reliability in corrosive environments, such as marine or chemical applications, by defining chemical compositions and performance criteria. Compliance with GB\/T 3098.16-2014 guarantees fasteners withstand operational stresses without failure. […]<\/p>","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[220],"tags":[],"class_list":["post-5697","post","type-post","status-publish","format-standard","hentry","category-technical-documentation-and-references"],"_links":{"self":[{"href":"https:\/\/korea-transmission.com\/ms\/wp-json\/wp\/v2\/posts\/5697","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/korea-transmission.com\/ms\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/korea-transmission.com\/ms\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/korea-transmission.com\/ms\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/korea-transmission.com\/ms\/wp-json\/wp\/v2\/comments?post=5697"}],"version-history":[{"count":2,"href":"https:\/\/korea-transmission.com\/ms\/wp-json\/wp\/v2\/posts\/5697\/revisions"}],"predecessor-version":[{"id":5699,"href":"https:\/\/korea-transmission.com\/ms\/wp-json\/wp\/v2\/posts\/5697\/revisions\/5699"}],"wp:attachment":[{"href":"https:\/\/korea-transmission.com\/ms\/wp-json\/wp\/v2\/media?parent=5697"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/korea-transmission.com\/ms\/wp-json\/wp\/v2\/categories?post=5697"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/korea-transmission.com\/ms\/wp-json\/wp\/v2\/tags?post=5697"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}