{"id":2327,"date":"2025-11-18T06:34:31","date_gmt":"2025-11-18T06:34:31","guid":{"rendered":"https:\/\/www.creativeforged.com\/blog\/?p=2327"},"modified":"2025-11-19T14:22:16","modified_gmt":"2025-11-19T14:22:16","slug":"gun-metal-flanges-complete-technical-guide","status":"publish","type":"post","link":"https:\/\/www.creativeforged.com\/blog\/gun-metal-flanges-complete-technical-guide\/","title":{"rendered":"Gun Metal Flanges: Complete Technical Guide"},"content":{"rendered":"\t\t
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Gun Metal Flanges: Complete Technical Guide by Creative Piping Solutions Pvt. Ltd.<\/h2>\n

Gun Metal\u2014also known as Red Brass, RG5, C83600<\/strong>, or Copper Tin Zinc Alloy<\/strong>\u2014has been one of the most reliable and corrosion-resistant alloys used in piping systems for decades. At Creative Piping Solutions Pvt. Ltd.<\/a>, we manufacture and export high-precision Gun Metal Flanges<\/a><\/strong> engineered for superior performance in marine, engineering, steam, and hydraulic applications.<\/p>\n

This in-depth guide covers material composition, mechanical properties, manufacturing standards, applications, advantages, types of flanges, pressure ratings, installation guidelines, and inspection methods<\/strong>\u2014everything required to understand Gun Metal Flanges from a technical point of view.<\/p>\n\n

What Are Gun Metal Flanges?<\/h3>\n

Gun Metal Flanges are copper-based alloy flanges<\/strong> primarily composed of:<\/p>\n\n

    \n \t
  1. Copper (Cu): 85\u201388%<\/strong><\/li>\n \t
  2. Tin (Sn): 5\u20138%<\/strong><\/li>\n \t
  3. Zinc (Zn): 3\u20135%<\/strong><\/li>\n \t
  4. Lead (Pb): 2\u20135% (for machinability)<\/strong><\/li>\n<\/ol>\n

    Gun Metal flanges are widely used in water supply systems, marine engineering, pump industries, shipbuilding, valves, and hydraulic lines<\/strong> because they exhibit:<\/p>\n\n

      \n \t
    1. Excellent corrosion resistance<\/strong> against seawater and brine.<\/li>\n \t
    2. High pressure-handling capacity<\/strong>.<\/li>\n \t
    3. Superior casting properties<\/strong>.<\/li>\n \t
    4. Great machinability<\/strong> and thermal stability<\/strong>.<\/li>\n<\/ol>\n<\/div>\n

      ASME B16.5 \u2014 Slip-On Flange, Class 150 \u2014 common sizes \u00bd\u2033 \u2192 12\u2033<\/h3>\t\n\t
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      NPS (in)<\/th>\n\t\t\t Bore D1 \/ B (in)<\/th>\n\t\t\t Outside Dia D (in)<\/th>\n\t\t\t Flange Thk t (in)<\/th>\n\t\t\t Raised Face Dia R (in)<\/th>\n\t\t\t Bolt Circle Dia K (in)<\/th>\n\t\t\t No. of Bolts \u00d7 Bolt Dia n-d (in)<\/th>\n\t\t\t Approx Weight (kg)<\/th>\n\t\t\t<\/tr>\n\t\t <\/thead>\n\t\t
      1\/2<\/td>0.840<\/td>3.50<\/td>0.44<\/td>1.88<\/td>2.75<\/td>4-0.50<\/td>0.30<\/td><\/tr>\n\t\t\t
      3\/4<\/td>1.050<\/td>3.87<\/td>0.44<\/td>2.12<\/td>3.12<\/td>4-0.50<\/td>0.36<\/td><\/tr>\n\t\t\t
      1<\/td>1.315<\/td>4.50<\/td>0.56<\/td>2.44<\/td>3.50<\/td>4-0.63<\/td>0.55<\/td><\/tr>\n\t\t\t
      1-1\/4<\/td>1.660<\/td>5.00<\/td>0.56<\/td>2.88<\/td>3.88<\/td>4-0.63<\/td>0.72<\/td><\/tr>\n\t\t\t
      1-1\/2<\/td>1.900<\/td>5.50<\/td>0.56<\/td>3.12<\/td>4.38<\/td>4-0.75<\/td>0.95<\/td><\/tr>\n\t\t\t
      2<\/td>2.375<\/td>6.50<\/td>0.62<\/td>3.62<\/td>4.88<\/td>4-0.75<\/td>1.45<\/td><\/tr>\n\t\t\t
      2-1\/2<\/td>2.875<\/td>7.50<\/td>0.75<\/td>4.38<\/td>5.75<\/td>4-0.88<\/td>1.95<\/td><\/tr>\n\t\t\t
      3<\/td>3.500<\/td>8.00<\/td>0.75<\/td>4.75<\/td>6.25<\/td>6-0.75<\/td>2.80<\/td><\/tr>\n\t\t\t
      4<\/td>4.500<\/td>9.00<\/td>0.88<\/td>5.75<\/td>7.50<\/td>8-0.75<\/td>4.50<\/td><\/tr>\n\t\t\t
      6<\/td>6.625<\/td>11.00<\/td>1.06<\/td>7.75<\/td>9.88<\/td>8-0.75<\/td>9.20<\/td><\/tr>\n\t\t\t
      8<\/td>8.625<\/td>13.00<\/td>1.25<\/td>10.00<\/td>12.00<\/td>8-0.88<\/td>17.5<\/td><\/tr>\n\t\t\t
      10<\/td>10.750<\/td>15.00<\/td>1.31<\/td>11.25<\/td>14.00<\/td>12-0.88<\/td>27.0<\/td><\/tr>\n\t\t\t
      12<\/td>12.750<\/td>17.00<\/td>1.50<\/td>13.00<\/td>16.00<\/td>12-0.88<\/td>36.5<\/td><\/tr>\n\t\t <\/tbody>\n\t\t<\/table>\n\t<\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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      Chemical Composition of Standard Gun Metal (Typical RG5 \/ C83600)<\/h3>
      Element<\/th>% Composition<\/th><\/tr><\/thead>
      Copper (Cu)<\/td>84.0\u201388.0%<\/td><\/tr>
      Tin (Sn)<\/td>5.0\u20138.0%<\/td><\/tr>
      Zinc (Zn)<\/td>3.0\u20135.0%<\/td><\/tr>
      Lead (Pb)<\/td>2.0\u20135.0%<\/td><\/tr>
      Nickel (Ni)<\/td>\u2264 1.0%<\/td><\/tr>
      Iron (Fe)<\/td>\u2264 0.3%<\/td><\/tr><\/tbody><\/table><\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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      Mechanical Properties of Gun Metal Flanges<\/h3>
      Property<\/th>Value<\/th><\/tr><\/thead>
      Tensile Strength<\/td>210\u2013260 MPa<\/td><\/tr>
      Yield Strength<\/td>90\u2013120 MPa<\/td><\/tr>
      Elongation<\/td>12\u201318%<\/td><\/tr>
      Brinell Hardness<\/td>65\u201380 HB<\/td><\/tr>
      Melting Point<\/td>850\u2013950\u00b0C<\/td><\/tr>
      Density<\/td>8.7\u20138.9 g\/cm\u00b3<\/td><\/tr><\/tbody><\/table>

      These mechanical characteristics ensure durability even in the harshest operating conditions.<\/i><\/p><\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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      Manufacturing Standards Followed by Creative Piping Solutions<\/h3>

      Gun Metal Flanges can be manufactured according to multiple global standards:<\/p>

      1. ASME B16.5<\/strong><\/li>
      2. ASME B16.47<\/strong><\/li>
      3. BS 4504<\/strong><\/li>
      4. DIN \/ EN 1092-1<\/strong><\/li>
      5. ISO Standards<\/strong><\/li>
      6. JIS 5K, 10K, 16K<\/strong><\/li>
      7. AWWA Standards (Water Supply Applications)<\/strong><\/li><\/ol>

        We offer customization for size, schedule, pressure rating, drilling patterns, and face finish.<\/p>

        Types of Gun Metal Flanges Manufactured<\/h3>

        Gun Metal can be cast or machined into almost all standard flange types:<\/p>

        1. Gun Metal Slip-On Flanges (SO)<\/h4>