CCS DH690 (D690) Steel Plate – Properties & Equivalents

CCS DH690 (also written CCS D690, CCS/D690, CCS Grade D690 or DH690 steel plate) is a high-strength steel for welded marine and offshore structures certified by the China Classification Society (CCS) to CCS Rules for Materials and Welding (2024), Part 1, Chapter 3, Section 4 (High Strength Steels for Welded Structures). The number 690 is the minimum yield strength in MPa (up to 50 mm), tensile strength is 770–940 MPa, and the letter D sets the Charpy V-notch test temperature of −20°C. It is delivered thermo-mechanically rolled (TM) or quenched and tempered (QT) and corresponds to grade DH690 in IACS UR W16.

Gangsteel, a steel plate exporter, supplies CCS DH690 plate with CCS class certificates; the requirements below are taken directly from the current CCS rules.

Related CCS grades: CCS AH690 steel plate, CCS EH690 steel plate, CCS FH690 steel plate, CCS DH620 steel plate.

CCS DH690 chemical composition

CCS DH690 chemical composition, heat (ladle) analysis, % max unless stated, by delivery condition

Element	Heat analysis, TM	Heat analysis, QT
C	≤ 0.16	≤ 0.18
Mn	1.00–1.70	≤ 1.70
Si	≤ 0.60	≤ 0.80
P	≤ 0.025	≤ 0.025
S	≤ 0.015	≤ 0.015
Al (total)	≥ 0.02	≥ 0.018
Nb	≤ 0.05	≤ 0.06
V	≤ 0.12	≤ 0.12
Ti	≤ 0.05	≤ 0.05
Ni	≤ 2.00	≤ 2.00
Cu	≤ 0.55	≤ 0.50
Cr	≤ 0.50	≤ 1.50
Mo	≤ 0.50	≤ 0.70
N	≤ 0.025	≤ 0.015

 

Source: CCS Rules for Materials and Welding (2024), Part 1, Chapter 3, Table 3.4.3.2 (same values as IACS UR W16 Rev.3). Notes: Nb+V+Ti ≤ 0.26% and Mo+Cr ≤ 0.65% (not applicable to QT); total Al/N ≥ 2:1 unless other nitrogen-binding elements are used; Ni above 2.00% may be approved by CCS; boron, if added, ≤ 0.005%. Vacuum degassing is mandatory for the 690 strength level. CCS specifies the chemical composition as a heat (ladle) analysis only; the Rules give no product (check) analysis tolerances for these plates, so no product-analysis column is shown. If a product analysis is required, agree the tolerances in the order.

CCS DH690 mechanical properties and impact test

CCS DH690 tensile and Charpy V-notch requirements

Thickness (mm)	Yield ReH min (MPa)	Tensile Rm (MPa)
3 ≤ t ≤ 50	690	770–940
50 < t ≤ 100	650	770–940
100 < t ≤ 250	630	710–900

CCS DH690 elongation and impact energy

Elongation A5 min, T (%)	Elongation A5 min, L (%)	Charpy test temp.	KV avg min, T (J)	KV avg min, L (J)
14	16	−20°C	46	69

Source: CCS Rules for Materials and Welding (2024), Part 1, Chapter 3, Table 3.4.7.4. Plates over 600 mm wide are impact tested transversely (T value applies). For N/NR and TM plates one impact test is taken from each piece; for QT plates from each individually heat-treated piece. Above 50 mm, impact specimens are taken at t/4 and t/2.

CCS DH690 maximum carbon equivalent (plates)

Delivery condition	Ceq t ≤ 50 mm	Ceq 50 < t ≤ 100 mm	Ceq 100 < t ≤ 250 mm	CET	Pcm
TM	0.56	n/a	n/a	0.36	0.30
QT	0.64	0.66	0.70	0.40	0.33

Table 3.4.3.4. Ceq = C + Mn/6 + (Cr + Mo + V)/5 + (Ni + Cu)/15; CET = C + (Mn + Mo)/10 + (Cr + Cu)/20 + Ni/40 (H460 and above, at the mill’s option); Pcm may be used for TM and QT steels with C ≤ 0.12%. n/a = not applicable.

CCS DH690 thickness range and delivery condition

CCS DH690 maximum plate thickness by delivery condition

Delivery condition	Max plate thickness (mm)
TM	150
QT	150

Table 3.4.6.2. Thicker plates (N over 250 mm, QT over 150 mm) need special consideration by CCS. Yield and tensile requirements fall in steps above 50 mm and 100 mm, as shown in the table above.

CCS DH690 equivalent grades

CCS DH690 equivalent grades of other classification societies

Standard / society	Equivalent grade
IACS UR W16	DH690
ABS	AB/DQ70
DNV	VL D690
LR	LR DH69
ASTM A131	no equivalent (A131 stops at the 40 strength level)

The IACS member societies use the same unified requirements, so these grades match in chemistry and properties. A plate still needs the certificate of the vessel’s own class society; one plate can carry dual or multiple class certification only when each society’s surveyor witnesses the tests.

CCS DH690 FAQ

Is CCS D690 the same as CCS DH690?

Yes. CCS lists the grade as DH690; D690 is a common shorthand for the same steel.

What is the yield strength of CCS DH690?

Minimum 690 MPa up to 50 mm, 650 MPa for 50–100 mm and 630 MPa for 100–250 mm. Tensile strength is 770–940 MPa (up to 100 mm).

What is the impact test temperature of CCS DH690?

−20°C, with a minimum average of 46 J transverse or 69 J longitudinal.

What is CCS DH690 equivalent to?

DH690 in IACS UR W16, ABS AB/DQ70, DNV VL D690 and LR DH69. ASTM A131 has no grade at this strength.

How is CCS DH690 supplied?

TM (including TM with accelerated cooling or direct quenching and tempering) or QT. The chemistry and carbon-equivalent limits depend on the delivery condition.

What is the maximum thickness of CCS DH690 plate?

Up to 150 mm in TM or QT condition; thicker plates need special consideration by CCS.

What is the CEV of CCS DH690?

Ceq maximum for plates up to 50 mm is 0.56% (TM), 0.64% (QT). Higher limits apply to thicker plates.

What is the difference between CCS DH690 and the A, D, E and F grades of the same strength?

The strength requirements are identical; only the Charpy test temperature changes (0, −20, −40 or −60°C), and E/F grades have tighter P and S limits.

Equivalent steel grade of CCS/D690
DNV	GL	LR	BV	ABS	NK	KR	RINA
NV D690	GL-D690	LR/DH69	BV/D690	ABS/DQ70	K D70	R D70	RI/D690

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

Related steel grades: CCS/D550, CCS/A690, CCS/E690,CCS/A620

 

CCS Steel Plate Grade
General Strength	CCS/A	CCS/B	CCS/D	CCS/E
High Strength	CCS/A32	CCS/D32	CCS/E32	CCS/F32
	CCS/A36	CCS/D36	CCS/E36	CCS/F36
	CCS/A40	CCS/D40	CCS/E40	CCS/F40
Extra Strength	CCS/A420	CCS/D420	CCS/E420	CCS/F420
	CCS/A460	CCS/D460	CCS/E460	CCS/F460
	CCS/A500	CCS/D500	CCS/E500	CCS/F500
	CCS/A550	CCS/D550	CCS/E550	CCS/F550
	CCS/A620	CCS/D620	CCS/E620	CCS/F620
	CCS/A690	CCS/D690	CCS/E690	CCS/F690