AB FQ47 Steel Plate

 

 

Carbon Content and Weldability

Effect: Increasing the carbon content in AB/AQ51 steel plate generally reduces its weldability. Carbon is a strong austenite stabilizer. As the carbon content rises, the steel becomes more prone to hardening during welding. For example, in low - carbon steels (less than 0.2% carbon), the heat - affected zone (HAZ) during welding has a relatively small tendency to harden. However, when the carbon content exceeds 0.3%, the HAZ can harden significantly.

Mechanism: High - carbon steels tend to form martensite in the HAZ due to rapid cooling after welding. Martensite is a hard and brittle phase. The formation of martensite can lead to cracking in the welded joint. The difference in the coefficient of thermal expansion between the martensite and the surrounding base metal can also cause residual stresses, further increasing the risk of cracking.

Manganese and Weldability

Effect: Manganese is beneficial for weldability to a certain extent. It acts as a deoxidizer during the welding process. Manganese can also improve the hardenability of the steel in a more controlled way compared to carbon. In AB/AQ51 steel, an appropriate amount of manganese (around 0.6 - 1.6%) can help reduce the formation of harmful oxides and sulfides during welding, which can otherwise lead to porosity and inclusions in the weld.

Mechanism: Manganese combines with sulfur to form manganese sulfide (MnS), which is less harmful than iron sulfide (FeS). Iron sulfide can cause hot cracking in the weld because it has a low melting point and forms a liquid film at the grain boundaries during welding. Manganese also helps in maintaining the strength and toughness of the HAZ by promoting a more favorable microstructure.

 

 

 

 

 

 

AB/FQ47 Extra high Strength Chemical Composition in Tempering and Quenching
Grade	The Element Max (%)
	C	Si	Mn	P	S	N
AB/FQ47	0.18	0.55	1.60	0.025	0.025	0.02

 

 

Chromium and Weldability

Effect: Chromium can have a negative impact on weldability when present in large amounts. In AB/AQ51 steel, if the chromium content is high enough to form stainless steel - like properties (more than 12% chromium), it can lead to problems such as carbide precipitation during welding.

Mechanism: Chromium carbides can form at the grain boundaries in the HAZ during welding. This phenomenon, known as sensitization, can lead to a reduction in the corrosion resistance of the welded joint. Also, the formation of chromium carbides can cause the depletion of chromium in the adjacent matrix, making the area more prone to corrosion. To mitigate this, special welding techniques such as low - heat - input welding and post - weld heat treatment may be required.

 

 

 

 

 

 

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