27MnB4 Steel

Steel name: 27MnB4
Diagram No.: 1528
DIN designation: 27MnB4
Chemical composition in weight %: 0.25-0.30% C, 0.15-0.35% Si, 1.10-1.30% Mn, max. 0.035% P, 0.015-0.035% S, 0.10-0.30% Cr, 0.0010-0.0060% B
Steel group: Alloy steels, boron steels
Applications: Grade SB27M12B is a boron steel for general purposes without any specified mechanical properties. Its closest equivalent is found in the EN 10263-4:2001 grade 27MnB4. The difference is the manganese content. SB27M12B may serve as wear parts in graders and snowploughs but also suitable for agriculture machinery.
Comment: Ms=384 C, Ac1=721 C, Ac3=787 C.
Reference: Not shown in this demo version.

Heat Treatment

Hardenability Diagram


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