20MnMoR Pressure Vessel Steel Plate

20MnMo belongs to low-alloy pressure vessel forged steel, which is used to manufacture pressure vessel components and important forgings at -40°C to 470°C. The carbon content is 0.2%, and the content of Mn and MO are both less than 1.5%. The chemical composition of this forging mainly includes alloying elements such as C, Si, Mn, Mo, Cr, and Ni. The chemical composition of SA508-3cl.2 steel for nuclear electric pressure vessel is very similar to it.

20MnMo adopts VD degassing treatment-vacuum protection to cast steel ingots. Our factory produces 20MnMo tube sheet forgings. The chemical composition is in accordance with NB/T47009-2010 carbon steel and low alloy steel forgings standards for pressure vessels.

In terms of forging forming, the forging process of tube sheet is one of the more mature processes of our company. 

Mainly control from the following points:

1. Before forging, the steel ingot is supercooled, cooled to 430±10℃ in air, returned to the furnace for heat preservation, and then heated. 
2. Ensure the removal of the water riser, and ensure that the defects in the water riser are removed. 
3. The spinning method is adopted in the forming deformation to strengthen the compaction effect and spread the inclusions. 
4. Fully heat preservation before the last fire, and control the deformation of the last fire. 
5. The preliminary heat treatment after forging adopts two normalizing and tempering treatments to ensure grain refinement and full hydrogen expansion.

Regarding the technical requirements to be achieved after quenching and tempering of 20MnMo steel for large forgings, our company has mastered the mature quenching and tempering process, which has significantly improved the strength and toughness of 20MnMo large forgings after quenching and tempering. The key points for the quenching and tempering treatment of this type of low-carbon and low-alloy forgings are:

1. Control the appropriate quenching temperature. 
2. Reduce the water temperature to improve the cooling method of forging quenching.
3. Design reasonable quenching tooling so that the surface of the forging is fully in contact with the water medium. 
4. Choose a reasonable tempering temperature.

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