Product introduction

20 # seamless steel pipe is widely used in petrochemical and other industries for its excellent performance and suitable price. 20 #. There are national standards such as seamless steel tubes for fluid transportation (GB / t8163-2008), seamless steel tubes for low and medium pressure boilers (gb3087-2008), seamless steel tubes for petroleum cracking (gb9948-2013) and seamless steel tubes for high pressure fertilizer equipment (gb6479-2013).

What are the standards for 20 # seamless steel pipes?
(1) GB / t8163-2008 seamless steel pipe for fluid transportation
(2) gb3087-2008 seamless steel tubes for low and medium pressure boilers
(3) seamless steel tubes for petroleum cracking (GB / T 9948-2013)
(4) seamless pipe for high pressure fertilizer equipment (GB / T 6479-2013)
(5) GB / T 5310-2017 seamless steel tubes for high pressure boilers (in the standard, the steel number is 20g; G refers to boiler steel tubes)

20 # chemical composition
Table 1, Chemical Composition of 20 # Seamless Steel Pipe

It can be seen from table 1 that the content of main elements (such as C, Si, Mn) in the chemical composition of 20 × seamless steel pipe in each material standard is the same. The content of residual elements (such as Ni, CI, Cu, Mo, V) in steel in gb9948-2013 and GB 6479-2013 are the same, but there are slight differences between GB / T 8163-2008 and the above two standards. The main difference of chemical composition lies in the content of P and s.

20 # mechanical properties (mechanical properties)
Table 2, Mechanical Properties of 20 # Seamless Steel Pipe

It can be seen from table 2 that the tensile properties of 20 # seamless steel pipes in each material standard are basically the same, and the main difference is impact test.
The 20 # seamless steel pipe manufactured in accordance with GB / t8163-2008 shall not be subject to impact test. Charpy V-notch impact test shall be carried out only when required by the demander, negotiated by the supplier and the demander, and specified in the contract.