For LR AH42 steel plates, the following are some recommended post - welding heat - treatment methods:

 

Stress - Relief Annealing

 

Temperature Range: It is usually between 550°C and 650°C.

Holding Time: Generally, it is determined according to the plate thickness. The holding time is about 1 hour for every 25 - millimeter - thick plate. For example, when the plate thickness is 50 mm, the holding time is approximately 2 hours.

Cooling Method: After the holding period, the plate is slowly cooled to room temperature along with the furnace. The cooling rate should not be too fast to avoid the generation of new stresses.

 

 

 

 

 

 

 

LR/AH42 extra high Strength Chemical Composition
Grade	The Element Max (%)
	C	Si	Mn	P	S	Al	N
LR/AH42	0.21	0.55	1.70	0.035	0.035	0.015	0.020
	Nb	V	Ti	Cu	Cr	Ni	Mo
	0.02-0.05	0.03-0.10	0.02

 

 

Normalizing Plus High - Temperature Tempering

 

Normalizing: Heat the welded LR AH42 steel plate to 30°C - 50°C above Ac3, generally around 880°C - 920°C. Hold it for a certain period and then air - cool. The holding time can be calculated as 1 - 1.5 minutes per millimeter of plate thickness. For example, when the plate thickness is 30 mm, the holding time is about 30 - 45 minutes.

High - Temperature Tempering: After normalizing, high - temperature tempering is carried out. The tempering temperature is between 550°C and 650°C. The holding time and cooling method are similar to those of simple stress - relief annealing.

 

Post - welding heat treatment should be carried out as soon as possible after welding to avoid the long - term existence of welding residual stress, which may lead to defects such as cracks. At the same time, during the heat - treatment process, the heating rate, holding time, and cooling rate and other parameters should be strictly controlled to ensure that the heat - treatment effect is uniform.

 

 

 

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