What is the difference between 20MnG and 25MnG high pressure boiler seamless pipes

 They are also high-quality carbon boiler tubes under the GB5310 boiler tube standard, which can be used in high-pressure environments. As the grade of steel for steam boiler tubes, what is the difference between 20MnG and 25MnG?

Under the same conditions of Si, Mn and other elements, the C element content of 25MnG is higher than that of 20MnG, which leads to the hardness of 25MnG seamless pipe is better than that of 20MnG, and the tensile strength and yield strength are stronger. The plasticity and toughness of the 25MnG boiler seamless tube will also be relatively reduced.

The specific data can be found in the table below:

Chemical composition of GB 5310 20MnG and 25MnG

Steel Pipe
Chemical Composition(%)
C
Si
Mn
Cr
Mo
V
Ni
Cu
P
Max
20MnG
0.17～0.23
0.17～0.37
0.70～1.00
-
-
-
-
-
0.025
25MnG
0.22～0.27
0.17～0.37
0.70～1.00
-
-
-
-
-
0.025

Mechanical properties of GB 5310 20MnG and 25MnG

Steel Pipe
Tensile properties
Impact energy(Akv)，J
Tensile strength
(MPa)
Yield Strength
(MPa)
Elongation
%
Portrait
Landscape
Portrait
Landscape
 
 
Max
20MnG
≥415
240
22
20
40
27
25MnG
≥448
275
28
18
40
27

If you are interested in 25MnG high pressure boiler seamless pipe, you can ask us for the latest quotation!


From:http://boilersteelpipe.com/pro/smls/what-is-the-difference-between-20mng-and-25mng-high-pressure-boiler-seamless-pipes.html

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