What is the difference between 20MnHR and 20MnHR-B steel

20MnHR plate is a normalized pressure vessel steel plate with a temperature ranging from normal temperature to -20℃, and has excellent strength, toughness and welding performance. 20MnHR steel is mainly used in the manufacture of high-parameter pressure vessels.

20MnHR-B steel is a nuclear power steel. 20MnHR-B Specifications: Thickness: 8-120mm, Width: 1600-4020mm, Length: 6000-17500mm.

20MnHR steel mechanical properties:

Smelting analysis of 20MnHR and 20MnHR-B steel (finished products):
20MnHR steel chemical composition:
C≤0.20; Si: 0.20-0.50; Mn1.00-1.60; Mo≤0.15; Cr≤0.25; Cu≤0.28; Cu+6Sn≤0.33; Nb≤0.040; V≤0.050; Ni≤0.30; P≤0.015; S≤0.012.

20MnHR-B steel chemical composition:
C≤0.20; Si: 0.20-0.50; Mn1.00-1.60; P≤0.015; S≤0.012; Mo≤0.15; Cr≤0.25; Cu≤0.28; Cu+6Sn≤0.33; Nb≤0.040; V≤0.050; Ni≤0.30.