GB 712 DH40 Shipbuilding Steel

GB 712 DH40 shipbuilding steel is a kind of ordinenary strength structural steel for ships and ocean engineering. Hot rolled GB 712 DH40 steel products are supplied in plates, sheets, angles steel bars, steel channels, H beams and bulb flats.
GB 712 DH40 Shipbuilding Steel Specification
Standard: GB 712-2011
Material: GB 712-2011 AH40
Category: ships and ocean engineering structural steel
Shapes: GB 712 DH40 plate, GB 712 DH40 sheets, GB 712 DH40 coils, GB 712 DH40 steel angles, GB 712 DH40 H beams, GB 712 DH40 bulb flats
DH40 Shipbuilding Steel Plates Size
Thickness: 4mm to 150mm,
Width: 1200mm to 4000mm
Length: 3000mm to 18000mm

DH40 Shipbuilding Steel Chemical Composition in GB 712-2011 standard

Grade	The element content (%)
	C	Si	Mn	P	S	Als	N
GB 712 DH40	0.18 Max.	0.50 Max.	0.90-1.60	0.025 Max.	0.025 Max.	0.015 Min.	-
	Nb	V	Ti	Cu	Cr	Ni	Mo
	0.02-0.05	0.05-0.10	0.02 Max.	0.35 Max.	0.20 Max.	0.40 Max.	0.08 Max.

 Crack Sensitivity:  Pcm = (C+Si/30+Mn/20+Cu/20+Ni/60+Cr/20+Mo/15+V/10+5B)%
Carbon Equivalent:  Ceq = 【C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15】%

 DH40 Shipbuilding Steel Mechanical Properties in GB 712-2011 standard

Grade		Mechanical Properties			Charpy V Impact Test
	Thickness	Yield	Tensile	Elongation	Degree	Energy 1	Energy 2
GB 712 DH40	mm	Min Mpa	Mpa	Min  %	0	KV₂/J	KV₂/J
	t≤50	390	510-660	20%		27	41
	50＜t≤70	390	510-660	20%		31	46
	70＜t≤150	390	510-660	20%		37	55
Note: Energy 1 is transverse impact test, Energy 2 is longitudinal impact test

The GB 712-2011 standard specifies the classification and grade, order content, size, shape, weight and allowable deviation, requirements, inspection and test, packaging, marking and quality certificate of structural steel for ships and marine engineering. This standard is applicable to the manufacture of GB 712 DH40 steel plates with thickness of not more than 150 mm, GB 712 DH40 steel sheets and strips less than 25.4 mm and GB 712 DH40 steel profiles with diameter not more than 50 mm for the navigation vessels, fishing vessels and marine engineering structures in the ocean, coastal and inland river navigation areas.
DH40 shipbuilding steel plates in GB 712-2011 standard are applicable to the hull structure of ships in ocean, coastal and inland rivers. GB 712-2011 DH40 shipbuilding steel products also can be used for ship repairing, the offshore oil drilling platform, the platform pipe joints and other components. We can supply GB 712 DH40 shipbuilding steel plates with nine marine class certifications ABS, BV, LR, DNV, CCS, GL, NK, KR, and RINA class society.