ASTM A131/ A131M Grade DH40 Shipbuilding Steel Plate

ASTM A131/A131M Grade AH40 are mainly used for building cranes project under high strength situation in many shipyards.

Technical Details:
Heat Treatment: Normalized, Quenched, Tempered, Impact Test.

For the heat treatment, shipbuilding steel plate A131 Grade DH40 have to be done under TMCP or Normalized for all the thickness, and shipbuilding steel plate A131 Grade AH40 have to be done under TMCP or Normalized for the thickness above 40 millimeter, and for below 40 millimeters, marine steel plates done under AR is Ok if the end user accept when purchase.

A131 DH40 high Strength Chemical Composition:

Grade/Material	Element	Composition( Max-A, Min-I)
A131 Grade DH40/ A131 DH40	C	0.18
	Mn	0.90- 1.60
	Si	0.10- 0.50
	P	0.035
	S	0.035

A131 DH40 high strength property:

Grade		Mechanical Property			Charpy V Impact Test
Grade	Thickness	Yield	Tensile	Elongation	Degree	Energy 1	Energy 2
A131 DH40	mm	Min Mpa	Mpa	Min %	-20	J	J
	t≤50	390	510-650	22%		20	30
	50＜t≤70	390	510-650	22%		-	-
	70＜t≤100	390	510-650	22%		-	-
Note: Energy 1 is transverse impact test, Energy 2 is longitudinal