20MnB4 Steel

Steel name: 20MnB4
Diagram No.: 1519
DIN designation: 20MnB4
Chemical composition in weight %: 0.18-0.23% C, 0.15-0.35% Si, 0.90-1.10% Mn, max. 0.035% P, max. 0.035% S, 0.10-0.30% Cr, 0.0010-0.0060% B
Steel group: Structural steels, boron steels
Applications: Grade SB21M10B is a boron steel for general purposes without any specified mechanical properties. Its closest equivalent is found in the EN 10263-4:2001 grade 20MnB4 but with a difference in boron and manganese content.
Comment: Ms=417 C, Ac1=723C, Ac3=805 C. Similar designations: SB21M10B - 20MnB4-3, 20MnB5.
Reference: Not shown in this demo version.

Heat Treatment
Hardening: 900 - 920oC/water
Tempering: None or at 200 C for maximum hardness

Hardenability Diagram

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Carbides in Steel
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Etchants Database
Hardenability Calculating Service
Macro Defects in Steel
Non-Metallic Inclusions in Steel
Tempering Diagrams of Steels

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