Carbon content of pipe fittings
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This post was last edited by Liushuiyunshine at 2023-10-12 10:58 to edit the regulations of an authoritative design institute: 4.6 When the carbon content in carbon steel exceeds 0.24%, it should not be used for welding pipes and fittings. But in the "GBT 13401-2017 Technical Specifications for Steel Butt Welded Pipe Fittings", CF415 and other materials contain 0.3% carbon. Is there any problem in using it?
Based on the information you provided, it seems that there are two different standards regarding the carbon content of pipe fitting steel. The authoritative design institute stipulates that carbon steel with a carbon content of more than 0.24% should not be used for welded pipes and fittings. However, in the GBT 13401-2017 standard, steel butt welding pipe fittings with a carbon content of 0.3% such as CF415 can be used. Different standards may have different requirements for the same type of steel pipes or fittings, which may be related to the use environment, pressure, etc. Therefore, the carbon content of pipe fitting steel should be selected according to specific standard requirements. .
Look at the carbon content of the same American standard pipe fittings.
When the carbon content in carbon steel exceeds 0.24%, it is not suitable for welding pipes and fittings. Is this sentence too strict?
In fact, there is another sentence behind it: In special circumstances, if steel with a carbon content exceeding 0.24% (0.25%) is selected, the carbon equivalent should be limited to no more than 0.45%.
This post was last edited by Liushuiyunshine at 2023-10-14 09:49 "40BD002-2007 Process Piping Design Guidelines", no. :lol
You can ask the design institute to add this sentence, so that it will be perfect.
The provisions of SH 3059-2001 General Principles for Selection and Design of Petrochemical Pipeline Equipment are the same. “”SHT 3059-2012 Specifications for Selection of Petrochemical Pipeline Design Equipment "Relaxed, 6.1.12: Carbon steel or low alloy steel used for welding should not have a carbon content greater than 0.3%.
* * Standards are the minimum requirements. The requirements of design institutes, which we call institute standards, are often higher than * * standards, otherwise there is no need to formulate hospital standards if they are implemented according to national standards. It also depends on which standard the drawings or technical requirements stipulate. During the manufacturing process, our drawings comply with both national standards and hospital standards. In short, whoever demands higher standards will be followed.
The requirements of the hospital standard are higher than the national standard, so the one with the higher requirements should prevail.