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How to distinguish the authenticity of malleable steel pipe fittings

How to distinguish the authenticity of malleable steel pipe fittings

  • Categories:Industry news
  • Author:
  • Origin:
  • Time of issue:2013-11-15
  • Views:0

(Summary description)Quick Identification Method of "One Knock, Two Look, Three Pounds" for Fake and Shoddy Pipe Fittings
With the rapid development of my country's economy, the demand for malleable iron pipe fittings (commonly known as malleable steel pipe fittings) for water, gas and oil circuits is increasing day by day, and the quality requirements will also be higher and higher. The first thing to judge the quality of a malleable pipe fitting is to see whether it meets the corresponding national standards (GB/T3287-2000).
However, some technical management, procurement and construction personnel suffer from little understanding of the national standards of malleable steel pipe fittings, and it is difficult to judge the quality of malleable steel pipe fittings for a while. They urgently need a more intuitive and portable atlas to help them identify. I believe that the publication of this atlas will help everyone to improve their ability to identify the quality of malleable steel pipe fittings and prevent them from being deceived.
One knock: malleable iron pipe fittings are tough casting products. If knocked by external force, if the surface is dented or deformed a little, it will not crack, which means that its material performance is acceptable.
Second look: When you look at the length of the thread, the thread length of general fake products always appears to be particularly short. Second, look at galvanizing. The galvanizing specified in GB/T3287-2000 refers to hot-dip galvanizing with better corrosion resistance. Zinc layer. The counterfeit and inferior products are treated with electro-galvanizing or other coatings after processing the thread. The surface of the thread has a zinc layer (coating), which is much lower in cost and has poor corrosion resistance. After being installed on the pipeline, yellow water (rust water) ) appears.
Three: The malleable steel pipe fittings that cut corners will definitely reduce the outer diameter, reduce the wall thickness, and shorten the medium and long dimensions. It is generally more than 10% lighter than the pipe fittings that meet the national standard. We can judge fake and inferior by weighing the weight with our hands.

How to distinguish the authenticity of malleable steel pipe fittings

(Summary description)Quick Identification Method of "One Knock, Two Look, Three Pounds" for Fake and Shoddy Pipe Fittings
With the rapid development of my country's economy, the demand for malleable iron pipe fittings (commonly known as malleable steel pipe fittings) for water, gas and oil circuits is increasing day by day, and the quality requirements will also be higher and higher. The first thing to judge the quality of a malleable pipe fitting is to see whether it meets the corresponding national standards (GB/T3287-2000).
However, some technical management, procurement and construction personnel suffer from little understanding of the national standards of malleable steel pipe fittings, and it is difficult to judge the quality of malleable steel pipe fittings for a while. They urgently need a more intuitive and portable atlas to help them identify. I believe that the publication of this atlas will help everyone to improve their ability to identify the quality of malleable steel pipe fittings and prevent them from being deceived.
One knock: malleable iron pipe fittings are tough casting products. If knocked by external force, if the surface is dented or deformed a little, it will not crack, which means that its material performance is acceptable.
Second look: When you look at the length of the thread, the thread length of general fake products always appears to be particularly short. Second, look at galvanizing. The galvanizing specified in GB/T3287-2000 refers to hot-dip galvanizing with better corrosion resistance. Zinc layer. The counterfeit and inferior products are treated with electro-galvanizing or other coatings after processing the thread. The surface of the thread has a zinc layer (coating), which is much lower in cost and has poor corrosion resistance. After being installed on the pipeline, yellow water (rust water) ) appears.
Three: The malleable steel pipe fittings that cut corners will definitely reduce the outer diameter, reduce the wall thickness, and shorten the medium and long dimensions. It is generally more than 10% lighter than the pipe fittings that meet the national standard. We can judge fake and inferior by weighing the weight with our hands.

  • Categories:Industry news
  • Author:
  • Origin:
  • Time of issue:2013-11-15
  • Views:0

Quick Identification Method of "One Knock, Two Look, Three Pounds" for Fake and Shoddy Pipe Fittings

With the rapid development of my country's economy, the demand for malleable iron pipe fittings (commonly known as malleable steel pipe fittings) for water, gas and oil circuits is increasing day by day, and the quality requirements will also be higher and higher. The first thing to judge the quality of a malleable pipe fitting is to see whether it meets the corresponding national standards (GB/T3287-2000).

However, some technical management, procurement and construction personnel suffer from little understanding of the national standards of malleable steel pipe fittings, and it is difficult to judge the quality of malleable steel pipe fittings for a while. They urgently need a more intuitive and portable atlas to help them identify. I believe that the publication of this atlas will help everyone to improve their ability to identify the quality of malleable steel pipe fittings and prevent them from being deceived.

One knock: malleable iron pipe fittings are tough casting products. If knocked by external force, if the surface is dented or deformed a little, it will not crack, which means that its material performance is acceptable.

Second look: When you look at the length of the thread, the thread length of general fake products always appears to be particularly short. Second, look at galvanizing. The galvanizing specified in GB/T3287-2000 refers to hot-dip galvanizing with better corrosion resistance. Zinc layer. The counterfeit and inferior products are treated with electro-galvanizing or other coatings after processing the thread. The surface of the thread has a zinc layer (coating), which is much lower in cost and has poor corrosion resistance. After being installed on the pipeline, yellow water (rust water) ) appears.

Three: The malleable steel pipe fittings that cut corners will definitely reduce the outer diameter, reduce the wall thickness, and shorten the medium and long dimensions. It is generally more than 10% lighter than the pipe fittings that meet the national standard. We can judge fake and inferior by weighing the weight with our hands.

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Next: National standard of malleable steel pipe fittings
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Next: National standard of malleable steel pipe fittings

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Malleable cast iron pipe fittings are produced according to GB/T3287-2011 "Malgeable cast iron pipe fittings". The GB/T 3287-2011 standard is the second Chinese national standard set in July 2009. When the standard was revised, the international standard ISO49: 1994 "Moldable Iron Pipe Fittings with ISO 7-1 Thread" and the European Standard EN 10242: 1994/A2: 2003 "Malgeable Iron Threaded Pipe Fittings" were adopted, which are equivalent to the above two advanced foreign standards. 1. The mechanical properties of the pipe fittings are tensile strength ≥330MPa; elongation ≥8%, which is better than the malleable cast iron of the KTH300-06 grade specified in GB/T9440-2010 "Moldable Iron Castings". 2. The structural dimensions of the pipe fittings conform to the provisions of Appendix A in the GB/T3287-2011 standard, and are consistent with the dimensions stipulated in the ISO49:1994 and EN 10242:1994/A2:2003 standards. 3. The thread of the pipe fitting adopts GB/T7306.1-2000 "55° Sealing Pipe Thread Part 1: Cylindrical Internal Thread and Conical External Thread" and GB/T7306.2-2000 "55° Sealing Pipe Thread Part 2: Conical Internal Threads and Tapered External Threads". It corresponds to the European Community pipe thread standards EN10226-1: 2004 (E) and EN10226-2: 2005 (E). It is the same as the pipe thread profile, size, tolerance and code specified in the international standard ISO7-1:1994. According to the national standards collected at present, all major industrial countries in the world except the United States, the European Community and most countries in the world have adopted the pipe thread standards stipulated by ISO7-1. Therefore, the threads specified in GB/T7306 are consistent with international standards, and can also be smoothly matched with the pipe threads of most countries in the world. 4. The hot-dip galvanized layer of the pipe fittings conforms to the requirements of GB/T3287-2011, ISO49:1994, EN10242:1994/A2:2003 and other standards. The quality of the surface zinc layer is not less than 500g/m2, the average thickness is 70μm, and the average thickness of individual samples is not less than 450g/m2, and the average thickness is 63μm.
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