Introduction of 20MnMoR alloy steel plate
20MnMoR belongs to the steel plate for boilers and pressure vessels, and is used to manufacture steel for pressure vessels of petrochemical, gas separation, gas storage and transportation equipment. It is required to have sufficient strength and toughness, good welding performance and hot and cold processing performance. The commonly used steels are mainly low-alloy high-strength steels and carbon steels.
| Chemical composition |
| Tabulation: Depu Steel Date: 2024-01-22 |
| C |
Si |
Mn |
P |
S |
Cr |
Ni |
Mo |
AL |
| 0.17-0.23 |
0.17-0.37 |
0.10-1.40 |
0.025 |
0.01 |
0.30 |
0.30 |
0.20-0.35 |
0.25 |
Note:
(1): In order to improve the properties of steel, the number of other trace alloying elements other than the above table can be added; It comes from the Internet and is for reference only.
(2): The allowable deviation of the chemical composition of the finished steel plate shall comply with the provisions of
GB/T222 20MnMoR steel plate is used to manufacture pressure vessel components and important forgings at -40 °C ~ 470 °C. The carbon content is 0.2%, the content of Mn and MO is less than 1.5%, the chemical composition of this kind of forging is mainly C, Si, Mn, Mo, Cr, Ni and other alloying elements, and the chemical composition of SA508-3Cl.2 steel for nuclear power pressure vessel is very similar.
The 20MnMoR steel plate adopts the process scheme of EBT primary refining-LF refining-VD degassing treatment-vacuum protection pouring, and the chemical composition is in accordance with the JB4726-2000 carbon steel and low alloy steel forgings standard for pressure vessels, and the smelting process is as follows, using 80t electric arc furnace for primary refining of molten steel, dephosphorization, 60tLF refining to adjust the composition, desulfurization, VD degassing treatment, and finally poured into 53t steel ingots under vacuum protection, melting and analysis of all elements Meet customer requirements. In terms of forging forming, the forging process of tubular sheet is one of the more mature processes of our company
