AB FH40 Steel Plate

 

 

 

 

The following is the impact of chromium addition on the microstructure and mechanical properties of AB/FH40 steel plate.

 

Impact on Microstructure

 

Formation of Alloy Cementite and Carbides: Chromium is a medium - strength carbide - forming element. A portion of chromium will replace iron to form alloy cementite such as (Fe, Cr)₃C. As the chromium content increases, the carbides in the steel gradually change to Cr₂₃C₆ and Cr₇C₃. These carbides have high hardness and strong stability, and are dispersed in the steel matrix. They play a role in grain refinement, impeding the movement of dislocations, thereby increasing the strength and hardness of the steel.

 

Solid - Solution Strengthening: A part of chromium dissolves into ferrite to form a solid - solution, producing a solid - solution strengthening effect and increasing the strength and hardness of ferrite. Due to the difference in atomic radius between chromium and iron atoms, the dissolution will cause lattice distortion and increase the resistance to dislocation movement, thus increasing the strength of the steel.

 

 

 

 

 

 

AB/FH40 high Strength Chemical Composition
Grade	The Element Max (%)
	C	Si	Mn	P	S	Al	N
AB/FH40	0.16	0.1-0.50	0.90-1.6	0.025	0.025	0.015	0.009
	Nb	V	Ti	Cu	Cr	Ni	Mo
	0.02-0.05	0.05-0.10	0.02	0.35	0.2	0.8	0.08

 

 

 

 

 

Enhancement of Austenite Stability: The diffusion rate of chromium in austenite is relatively small, and it also hinders the diffusion of carbon. This can improve the stability of austenite, shift the C - curve to the right, reduce the critical cooling rate, and increase the hardenability of the steel. This makes it easier for the steel to obtain a martensitic structure during quenching and also helps to refine the microstructure.

 

Formation of Intermetallic Compound Phases: When the chromium content is relatively high, intermetallic compound σ - phase (FeCr) and others may be formed. The precipitation of these phases will have a certain impact on the properties of the steel, such as reducing the plasticity and toughness of the steel.

 

 

 

 

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