{"id":112,"date":"2022-08-16T14:33:05","date_gmt":"2022-08-16T14:33:05","guid":{"rendered":"https:\/\/rolextitan.com\/?page_id=112"},"modified":"2022-08-17T09:15:19","modified_gmt":"2022-08-17T09:15:19","slug":"specification-of-stainless-steel-fasteners","status":"publish","type":"page","link":"https:\/\/rolextitan.com\/?page_id=112","title":{"rendered":"Specification of Stainless Steel Fasteners"},"content":{"rendered":"\n

STAINLESS STEEL FASTENERS<\/h1>\n\n\n\n

<\/h3>\n\n\n\n

Introduction<\/strong><\/h3>\n\n\n\n

Stainless steel fasteners are specified to BS EN ISO 3506. Part 1 covers bolts, screws and studs. Part 2 covers nuts. These specifications replaced BS 6105. The latest edition was issued in 2020 and now includes 6% Mo Austenitic stainless steels and Duplex stainless steels, along with a new \u2018100\u2019 property class for these steels, (and for the previous \u2018A4\u2019 and \u2018A5\u2019 fastener classifications).<\/p>\n\n\n\n

Chemical composition for austenitic stainless steel fasteners<\/strong><\/h3>\n\n\n\n

The chemical compositions of the various fastener grades are shown in Table 1. The approximate<\/strong> equivalent grades in other systems are shown for reference. The composition ranges are much wider in this standard than in the standards for the feedstock product, usually bar.<\/p>\n\n\n\n

Table 1 Chemical composition for stainless steel fasteners<\/strong><\/p>\n\n\n\n

Grade<\/th>Chemical Composition1<\/sup> (% maxima unless stated)<\/th>Notes<\/th>Alternative names<\/th><\/tr>
C<\/th>Si<\/th>Mn<\/th>P<\/th>S<\/th>Cr<\/th>Mo<\/th>Ni<\/th>Cu<\/th>N<\/th><\/tr>
A1<\/td>0.12<\/td>1.00<\/td>6.5<\/td>0.020<\/td>0.15\/0.35<\/td>16.0-19.0<\/td>0.70<\/td> 5.0-10.0<\/td>1.75-2.25<\/td>\u2013<\/td>2 3 4<\/sup><\/td>303S31, 303S42, 1.4305<\/td><\/tr>
A2<\/td>0.10<\/td>1.00<\/td>2.00<\/td>0.050<\/td>0.030<\/td>15.0-20.0<\/td>\u20135<\/sup><\/td>8.0-19.0<\/td>4.0<\/td>\u2013<\/td>6 7<\/sup><\/td>304, 394S17 (BS 3111), 1.4301, 1.4567<\/td><\/tr>
A3<\/td>0.08<\/td>1.00<\/td>2.00<\/td>0.045<\/td>0.030<\/td>17.0-19.0<\/td>\u20135<\/sup><\/td>9.0-12.0<\/td>1.00<\/td>\u2013<\/td>8<\/sup><\/td>321, 1.4541, 347, 1.4550<\/td><\/tr>
A4<\/td>0.08<\/td>1.00<\/td>2.00<\/td>0.045<\/td>0.030<\/td>16.0-18.5<\/td>2.00-3.00<\/td>10.0-15.0<\/td>4.0<\/td>\u2013<\/td>7 9<\/sup><\/td>316, 1.4401, 1.4578<\/td><\/tr>
A5<\/td>0.08<\/td>1.00<\/td>2.00<\/td>0.045<\/td>0.030<\/td>16.0-18.5<\/td>2.00-3.00<\/td>10.5-14.00<\/td>1.00<\/td>\u2013<\/td>8 9<\/sup><\/td>316Ti, 1.4571, 316Cb, 1.4580<\/td><\/tr>
A8<\/td>0.030<\/td>1.00<\/td>2.00<\/td>0.040<\/td>0.030<\/td>19.0-22.0<\/td>6.0-7.0<\/td>17.5-26.0<\/td>1.50<\/td>\u2013<\/td>\u2013<\/td>6% Mo, 1.4547, 1.4529<\/td><\/tr>
C1<\/td>0.09-0.15<\/td>1.00<\/td>1.00<\/td>0.050<\/td>0.030<\/td>11.5-14.0<\/td>\u2013<\/td>1.00<\/td> \u2013<\/td>\u2013<\/td>9<\/sup><\/td>410, 1.4006<\/td><\/tr>
C3<\/td>0.17-0.25<\/td>1.00<\/td>1.00<\/td>0.040<\/td>0.030<\/td>16.0-18.0<\/td>\u2013<\/td>1.50-2.50<\/td>\u2013<\/td>\u2013<\/td><\/td>431, 1.4057<\/td><\/tr>
C4<\/td>0.08-0.15<\/td>1.00<\/td>1.50<\/td>0.060<\/td>0.15-0.35<\/td>12.0-14.0<\/td>0.60<\/td>1.00<\/td>\u2013<\/td>\u2013<\/td>2 9<\/sup><\/td>416, 1.4005<\/td><\/tr>
F1<\/td>0.08<\/td>1.00<\/td>1.00<\/td>0.040<\/td>0.030<\/td>15.0-18.0<\/td>\u201310<\/sup><\/td>1.00<\/td>\u2013<\/td>\u2013<\/td>11 12<\/sup><\/td>430, 1.4016, 430Ti, 1.4520 430Cb, 1.4511<\/td><\/tr>
D2<\/td>0.040<\/td>1.00<\/td>6.00<\/td>0.040<\/td>0.030<\/td>19.0-24.0<\/td>0.10-1.00<\/td>1.50-5.5<\/td>3.00<\/td>0.05-0.20<\/td>13<\/sup><\/td>Lean Duplex, DX 2202 1.4062, 1.4162 LDX 2101<\/td><\/tr>
D4<\/td>0.040<\/td>1.00<\/td>6.00<\/td>0.040<\/td>0.030<\/td>21.0-25.0<\/td>0.10-2.00<\/td>1.00-5.5<\/td>3.00<\/td>0.05-0.30<\/td>14<\/sup><\/td>2304 1.4362<\/td><\/tr>
D6<\/td>0.030<\/td>1.00<\/td>2.00<\/td>0.040<\/td>0.015<\/td>21.0-23.0<\/td>2.50-3.5<\/td>4.5-6.5<\/td>\u2013<\/td>0.08-0.35<\/td>\u2013<\/td>2205 1.4462<\/td><\/tr>
D8<\/td>0.030<\/td>1.00<\/td>2.00<\/td>0.035<\/td>0.015<\/td>24.0-26.0<\/td>3.00-4.5<\/td>6.0-8.0<\/td>2.50<\/td>0.20-0.35<\/td>15<\/sup><\/td>Zeron 100 1.4501, Ferrinox 255 1.4507<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Notes<\/p>\n\n\n\n

  1. Values are maximum unless otherwise indicated.<\/li>
  2. Sulphur may be replaced by selenium.<\/li>
  3. If the nickel content is below 8 %, the minimum manganese content shall be 5 %.<\/li>
  4. There is no minimum limit to the copper content provided that the nickel content is greater than 8 %.<\/li>
  5. Molybdenum may be present at the discretion of the manufacturer. However, if for some applications limiting of the molybdenum content is essential, this shall be stated at the time of ordering by the purchaser.<\/li>
  6. If the chromium content is below 17 %, the minimum nickel content should be 12 %.<\/li>
  7. For austenitic stainless steels having a maximum carbon content of 0,03 %, nitrogen may be present to a maximum of 0,22 %.<\/li>
  8. Shall contain titanium \u2265 5 \u00d7 C up to 0,8 % maximum for stabilisation and be marked appropriately in accordance with this table, or shall contain niobium, (columbium), and\/or tantalum \u2265 10 \u00d7 C up to 1,0 % maximum for stabilisation and be marked appropriately in accordance with this table<\/li>
  9. At the discretion of the manufacturer the carbon content may be higher, where required in order to obtain the specified mechanical properties at larger diameters, but shall not exceed 0,12 % for austenitic steels.<\/li>
  10. Molybdenum may be present at the discretion of the manufacturer.<\/li>
  11. May contain titanium \u2265 5 \u00d7 C up to 0,8 % maximum.<\/li>
  12. May contain niobium, (columbium), and\/or tantalum \u2265 10 \u00d7 C up to 1 % maximum.<\/li>
  13. Cr + 3.3Mo + 16N < or = 24.0 . This formula is used solely for the purpose of classifying duplex steels, it is not intended to be used as a selection criterion for corrosion resistance.<\/li>
  14. 24.0 < Cr + 3.3Mo +16N . This formula is used solely for the purpose of classifying duplex steels, it is not intended to be used as a selection criterion for corrosion resistance.<\/li>
  15. W < or = 1.00<\/li><\/ol>\n\n\n\n

    Mechanical properties for stainless steel fasteners<\/strong><\/h3>\n\n\n\n

    There are now four \u2018property classes\u2019 which are assigned selectively across the various austenitic stainless steel fastener grades now included in the standard. Table 2 shows the 0.2% proof stress, tensile strength and elongation values for each of these property classes.<\/p>\n\n\n\n

    Table 2 Mechanical properties for austenitic stainless steel bolts, screws and studs<\/strong><\/p>\n\n\n\n

    A8<\/p>\n\n\n\n

    Steel Group<\/strong><\/td>Steel Grade    <\/strong><\/td>Property Class<\/strong><\/td>Tensile Strength Rm<\/sub>1<\/sup> min MPa<\/strong><\/td>0.2% Proof Stress           Rp0.2<\/sub>1<\/sup> min MPa<\/strong><\/td>Elongation A2<\/sup> min mm<\/strong><\/td><\/tr>
    Austenitic<\/td>A1, A2, A3<\/td>50<\/td>500<\/td>210<\/td>0.6d<\/td><\/tr>
    70<\/td>700<\/td>450<\/td>0.4d<\/td><\/tr>
    80<\/td>800<\/td>600<\/td>0.3d<\/td><\/tr>
    A4,A5,<\/td><\/tr>
    70<\/td>700<\/td>450<\/td>0.4d<\/td><\/tr>
    80<\/td>800<\/td>600<\/td>0.3d<\/td><\/tr>
    100<\/td>1000<\/td>800<\/td>0.2d<\/td><\/tr>
    70<\/td>700<\/td>450<\/td>0.4d<\/td><\/tr>
    80<\/td>800<\/td>600<\/td>0.3d<\/td><\/tr>
    100<\/td>1000<\/td>800<\/td>0.2d<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

    Notes<\/p>\n\n\n\n

    1. The tensile stress is calculated on the stress area<\/li>
    2. To be determined on the actual screw length and not on a prepared test piece.<\/li><\/ol>\n\n\n\n

      This latest revision has removed the restrictions on the size of fastener (M24) for which the properties in table 2 can be guaranteed. However, there is a general clause which says that the standard is only applicable up to 39 mm diameter. Above that, the standard can still be used provided all parties agree that the properties can be achieved. The effect of these changes is to increase the maximum diameter on which the class 70 and 80 properties can be specified without discussion from 24 to 39 mm. This reflects the conservative nature of the previous 24 mm limit. Indeed, class 70 and 80 properties are available above 39 mm but this must always be discussed with the supplier.<\/p>\n\n\n\n

      Property class 50 represents the steel in the annealed condition.<\/p>\n\n\n\n

      The most common and readily available supply condition is property class 70, which represents a \u2018cold drawn\u2019 for the bar stock from which the fasteners are made.<\/p>\n\n\n\n

      Property class 80 is based on severely hard cold drawn bar.<\/p>\n\n\n\n

      Property class 100 condition, i.e. with a minimum tensile strength of 1000 MPa. is now part of the official standard.<\/p>\n\n\n\n

      All tensile stress values are calculated and reported in terms of the nominal tensile stress area of the thread.<\/p>\n\n\n\n

      The elongation measurement is determined on the actual bolt or screw length and not on a prepared test piece. It is expressed in millimetres (mm) of extension and not as percentage elongation, i.e. A = (L2<\/sub> \u2013 L1<\/sub>)
      (where L1<\/sub> = original length and L2<\/sub> = length after fracture)
      d = nominal diameter of bolt, screw or stud<\/p>\n\n\n\n

      There are three \u2018property classes\u2019 which are assigned to the Duplex stainless steel fastener grades now included in the standard. Table 3 shows the 0.2% proof stress, tensile strength and elongation values for each of these property classes.<\/p>\n\n\n\n

      Table 3 Mechanical properties for Duplex stainless steel bolts, screws and studs<\/strong><\/p>\n\n\n\n

      Steel Group<\/strong><\/td>Steel Grade    <\/strong><\/td>Property Class<\/strong><\/td>Tensile Strength Rm<\/sub>1<\/sup> min MPa<\/strong><\/td>0.2% Proof Stress           Rp0.2<\/sub>1<\/sup> min MPa<\/strong><\/td>Elongation A2<\/sup> min mm<\/strong><\/td><\/tr>
      Duplex<\/td>D2, D4, D6, D8<\/td>70<\/td>700<\/td>450<\/td>0.4d<\/td><\/tr>
      80<\/td>800<\/td>600<\/td>0.3d<\/td><\/tr>
      100<\/td>1000<\/td>800<\/td>0.2d<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

      Notes<\/p>\n\n\n\n

      1. The tensile stress is calculated on the stress area<\/li>
      2. To be determined on the actual screw length and not on a prepared test piece.<\/li><\/ol>\n\n\n\n

        This latest revision has removed the restrictions on the size of fastener, (M24), for which the properties in table 2 can be guaranteed. However, there is a general clause which says that the standard is only applicable up to 39 mm diameter. Above that, the standard can still be used provided all parties agree that the properties can be achieved. The effect of these changes is to increase the maximum diameter on which the class 70 and 80 properties can be specified without discussion from 24 to 39 mm. This reflects the conservative nature of the previous 24 mm limit. Indeed, class 70 and 80 properties are available above 39 mm but this must always be discussed with the supplier.<\/p>\n\n\n\n

        Duplex stainless steels are intrinsically stronger than standard austenitic stainless steels, so higher strengths can be achieved at lower levels of cold work, and hence there is no class \u201950\u2019, for these steels.<\/p>\n\n\n\n

        Property class 80 is based on cold drawn bar.<\/p>\n\n\n\n

        Property class 100 condition, i.e. with a minimum tensile strength of 1000 MPa. is now part of the official standard.<\/p>\n\n\n\n

        All tensile stress values are calculated and reported in terms of the nominal tensile stress area of the thread.<\/p>\n\n\n\n

        The elongation measurement is determined on the actual bolt or screw length and not on a prepared test piece. It is expressed in millimetres, (mm), of extension and not as percentage elongation, i.e. A = (L2<\/sub> \u2013 L1<\/sub>),
        (where L1<\/sub> = original length and L2<\/sub> = length after fracture)
        d = nominal diameter of bolt, screw or stud<\/p>\n\n\n\n

        Table 4 \u2014 Mechanical properties for bolts, screws and studs \u2013 Martensitic and ferritic steel grades<\/strong><\/p>\n\n\n\n

        Steel group<\/td>Steel
        grade<\/td>        		Property
        class<\/td>        		Tensile Strength Rm<\/sub>1<\/sup> min MPa<\/td>0.2% Proof Stress Rp0.2<\/sub>1<\/sup> min MPa<\/td>Elongation A2<\/sup> min mm<\/td>Hardness<\/td><\/tr>
        HB<\/td>HRC<\/td>HV<\/td><\/tr>
        Martensitic<\/td>C1<\/td>50<\/td>500<\/td>250<\/td>0.2 d<\/td>147\/209<\/td><\/td>155\/220<\/td><\/tr>
        70<\/td>700<\/td>410<\/td>0.2 d<\/td>209\/314<\/td>20\/34<\/td>220\/330<\/td><\/tr>
        1103<\/sup><\/td>1100<\/td>820<\/td>0.2 d<\/td> \u2013<\/td>36\/45<\/td>350\/440<\/td><\/tr>
        C3<\/td>80<\/td>800<\/td>640<\/td>0.2 d<\/td>228\/323<\/td>21\/35<\/td>240\/340<\/td><\/tr>
        C4<\/td>50<\/td>500<\/td>250<\/td>0.2 d<\/td>147\/209<\/td> \u2013<\/td>155\/220<\/td><\/tr>
        70<\/td>700<\/td>410<\/td>0.2 d<\/td>209\/314<\/td>20\/34<\/td>220\/330<\/td><\/tr>
        Ferritic<\/td>F14<\/sup><\/td>45<\/td>450<\/td>250<\/td>0.2 d<\/td>128\/209<\/td> \u2013<\/td>135\/220<\/td><\/tr>
        60<\/td>600<\/td>410<\/td>0.2 d<\/td>171\/271<\/td> \u2013<\/td>180\/285<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
        1. The tensile stress is calculated on the stress area<\/li>
        2. To be determined\u00a0on the actual screw length and not on a prepared test piece<\/li>
        3. Hardened and tempered at a minimum tempering temperature of 275 \u00b0C<\/li>
        4. Nominal thread diameter d \u2264 24 mm<\/li><\/ol>\n\n\n\n

          The New Pressure Equipment Directive (PED)<\/h2>\n\n\n\n

          The Pressure Equipment Directive (PED) 97\/23\/EC is a fundamental piece of European legislation relating to the safety of pressure equipment throughout Europe. Now 17 years old, it will be replaced by the new Directive 2014\/68\/EU.<\/p>\n\n\n\n

          The change will implement alignment with the New Legislative Framework which aims to streamline and simplify the rules for putting pressure equipment on the market in the face of increasing competition from fraudulently certified equipment.<\/p>\n\n\n\n

          The new fluid classification (2014\/68\/EU) which is part of the New Directive came into force in June 2015, and the remaining changes will come into force subject to enactment into UK law in July 2016.<\/p>\n\n\n\n

          We plan to support you through this transition, and will provide you with guidelines and useful information to help make this as smooth as possible.<\/p>\n\n\n\n

          <\/p>\n\n\n\n

          Inspection & Approval Certificates : C\/W Certificate (Calibration Works Certificate) EN 10204 3.1 \/ DIN 50049 3.1 \/ ISO 10474 3.1 Mill Test Certificate,
          ISI Mark, BIS Certified, NACE HIC TM-0284 \/ NACE MR-0103 \/ NACE MR-0175 \/ ISO 15166, CE Marked, European Pressure Equipment Directive
          PED-2014\/68\/EU, AD-2000-WO, ASME Boiler & Pressure Vessel Code Section-II Part A Edition 2019, API 6A (American Petroleum Institute),
          with EN 10204 3.2 Certificate duly Certified & Approved by IBR (Indian Boiler Regulations), LR Class (Lloyd\u2019s Register), GL (Germanischer Lloyd),
          BV (Bureau Veritas), DNV (Det Norske Veritas), ABS Class (American Bureau of Shipping), SGS, TUV, RINA, IR Class (Indian Register of Shipping),
          NORSOK Approved Standard M-630, M-650 Rev.3<\/p>\n\n\n\n

          If you have any requirement of above items, please feel free to contact us<\/p>\n\n\n\n

          Regards,<\/p>\n\n\n\n

          CONTACT PERSON :<\/strong><\/p>\n\n\n\n

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          Director
          Mobile No. 0091 \u2013 9820292499
          Email \u2013 marketing@rolexmetals.com<\/strong><\/p>\n\n\n\n

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          STAINLESS STEEL FASTENERS Introduction Stainless steel fasteners are specified to BS EN ISO 3506. Part 1 covers bolts, screws and studs. Part 2 covers nuts. These specifications replaced BS 6105. The latest edition was issued in 2020 and now includes 6% Mo<\/p>\n

          Read More<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"class_list":["post-112","page","type-page","status-publish","hentry"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/rolextitan.com\/index.php?rest_route=\/wp\/v2\/pages\/112","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/rolextitan.com\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/rolextitan.com\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/rolextitan.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/rolextitan.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=112"}],"version-history":[{"count":2,"href":"https:\/\/rolextitan.com\/index.php?rest_route=\/wp\/v2\/pages\/112\/revisions"}],"predecessor-version":[{"id":118,"href":"https:\/\/rolextitan.com\/index.php?rest_route=\/wp\/v2\/pages\/112\/revisions\/118"}],"wp:attachment":[{"href":"https:\/\/rolextitan.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=112"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}