ABS DH40 Steel Plate – Properties, Chemistry & Equivalents

ABS DH40 (also written AB/DH40, ABS Grade DH40, DH40 steel plate) is a higher-strength hull structural steel plate to ABS Rules Part 2, Chapter 1, Section 3. The figure 40 is the strength class (minimum yield 390 MPa, tensile 510-650 MPa) and the letter D sets the Charpy V-notch test temperature of -20°C. It is killed and fine-grain treated, with Nb, V, Ti or Al used as grain refiners, and corresponds to grade D40 in IACS UR W11 and DH40 in ASTM A131.

Related grades: ABS AH40 steel plate ABS EH40 steel plate ABS FH40 steel plate ABS DH32 steel plate.

Gangsteel is specialized in supplying ABS high strength steel plate in ABS Grade DH40. For more information of GradeDH40 steel plate, please check them in following:

 

 

 

AB/DH40 high Strength Chemical Composition

AB/DH40

ABS DH40 chemical composition, % – heat (ladle) analysis and product (check) analysis

Element	Heat analysis (max/min)	Product analysis
C	≤ 0.18	≤ 0.22
Mn	0.90–1.60	0.81–1.72
Si	0.10–0.50	0.04–0.56
P	≤ 0.035	≤ 0.045
S	≤ 0.035	≤ 0.045
Al (acid-soluble)	≥ 0.015	— (no tolerance in ASTM A6 Table A; product value not given)
Nb	0.02–0.05	0.010–0.060
V	0.05–0.10	0.040–0.110
Ti	≤ 0.02	≤ 0.03
Cu	≤ 0.35	≤ 0.38
Cr	≤ 0.20	≤ 0.24
Ni	≤ 0.40	≤ 0.43
Mo	≤ 0.08	≤ 0.09

Al, Nb and V minima apply when used singly (combined minima per ABS 2-1-3/5); Si min does not apply where acid-soluble Al ≥ 0.015%; AH ≤ 12.5 mm may have Mn min 0.70%. Product analysis = heat limit ± ASTM A6/A6M Table A permitted variation (band chosen by the specified maximum/upper limit); applies only when product (check) analysis is required; for a range, results may not vary both above and below it. Per ABS Rules for Materials and Welding Part 2 (2022); product analysis tolerances per ABS 2-1-2/5.3 (“chemical tolerances of ASTM A6”) and ASTM A6/A6M 7.2, Table A (also invoked by ASTM A131). Heat limits: ABS 2-1-3/7.3 Table 1 (t ≤ 150 mm).

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】%

 

 

 

AB/DH40 high strength property

AB/DH40

ABS DH40 mechanical properties by thickness

Thickness (mm)	Yield min (MPa)	Tensile (MPa)	Elongation A5 min (%)	Charpy test temp (°C)	Impact avg min, longitudinal (J)	Impact avg min, transverse (J)
t≤50	390	510-650	20	-20	39	26
50<t≤70	390	510-650	20	-20	46	31
70<t≤100	390	510-650	20	-20	55	37

Source: ABS Rules Pt 2, 2-1-3 Tables 2 & 4. Either direction acceptable.

Boiler steel plates| Alloy steel plates| High strength plate| Carbon steel plate

 

 

 

 

 

Equivalent steel grade of AB/DH40
DNV	GL	LR	BV	CCS	NK	KR	RINA
NV D40	GL-D40	LR/DH40	BV/DH40	CCS/D40	K D40	R D40	RI/D40

 

 

 

 

If you need more stock steel plates in shipbuilding steel plate, please click warehouse sizes.

 

 Related steel grades: AB/DH36, AB/DH32, AB/B, AB/D

 

 

ABS Steel Plate Grade Supplier
General Strength	AB/A	AB/B	AB/D	AB/E
High Strength	AB/AH32	AB/DH32	AB/EH32	AB/FH32
	AB/AH36	AB/DH36	AB/EH36	AB/FH36
	AB/AH40	AB/DH40	AB/EH40	AB/FH40
Extra Strength	AB/AQ43	AB/DQ43	AB/EQ43	AB/FQ43
	AB/AQ47	AB/DQ47	AB/EQ47	AB/FQ47
	AB/AQ51	AB/DQ51	AB/EQ51	AB/FQ51
	AB/AQ56	AB/DQ56	AB/EQ56	AB/FQ56
	AB/AQ63	AB/DQ63	AB/EQ63	AB/FQ63
	AB/AQ70	AB/DQ70	AB/EQ70	AB/FQ70

 

 

ABS DH40 thickness and impact requirements

ABS impact energy rises with plate thickness. ABS DH40 is tested at -20°C. Minimum average energies (full-size specimens):

• t≤50 mm: 39 J longitudinal / 26 J transverse
• 50<t≤70 mm: 46 J longitudinal / 31 J transverse
• 70<t≤100 mm: 55 J longitudinal / 37 J transverse

The ABS tables cover plates up to 150 mm. Plates thicker than 100 mm, or produced from coil, have extra rules in ABS Part 2, Chapter 1, Section 1.

ABS DH40 equivalent grades

Standard / society	Equivalent grade
ABS	AB/DH40
IACS UR W11	D40 (also written DH40)
ASTM A131	DH40
DNV	VL D40
LR / BV / CCS / RINA	DH40
NK	KD40
KR	RD40

Grades are equivalent in chemistry and properties because the IACS societies use the same unified requirements. A plate still needs a certificate from the vessel's own classification society, so one plate can carry dual or multiple class certification only when each society's surveyor tests it.

ASTM equivalent: ASTM A131 DH40 steel plate

LR equivalent: LR DH40 steel plate