CCS FH460 (F460) Steel Plate – Properties & Equivalents

CCS FH460 (also written CCS F460, CCS/F460, CCS Grade F460 or FH460 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 460 is the minimum yield strength in MPa (up to 50 mm), tensile strength is 540–720 MPa, and the letter F sets the Charpy V-notch test temperature of −60°C. It is delivered thermo-mechanically rolled (TM) or quenched and tempered (QT) and corresponds to grade FH460 in IACS UR W16.

Gangsteel, a steel plate exporter, supplies CCS FH460 plate with CCS class certificates; the requirements below are taken directly from the current CCS rules.

Related CCS grades: CCS AH460 steel plate, CCS DH460 steel plate, CCS EH460 steel plate, CCS FH420 steel plate, CCS FH500 steel plate.

CCS FH460 chemical composition

CCS FH460 chemical composition, heat (ladle) analysis, % max unless stated, by delivery condition

Element	Heat analysis, TM	Heat analysis, QT
C	≤ 0.14	≤ 0.18
Mn	1.00–1.70	≤ 1.70
Si	≤ 0.60	≤ 0.80
P	≤ 0.020	≤ 0.020
S	≤ 0.010	≤ 0.010
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%. 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 FH460 mechanical properties and impact test

CCS FH460 tensile and Charpy V-notch requirements

Thickness (mm)	Yield ReH min (MPa)	Tensile Rm (MPa)
3 ≤ t ≤ 50	460	540–720
50 < t ≤ 100	430	540–720
100 < t ≤ 250	390	500–710

CCS FH460 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)
17	19	−60°C	31	46

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 FH460 maximum carbon equivalent (plates)

Delivery condition	Ceq t ≤ 50 mm	Ceq 50 < t ≤ 100 mm	Ceq 100 < t ≤ 250 mm	CET	Pcm
TM	0.45	0.47	0.48	0.30	0.23
QT	0.47	0.48	0.50	0.32	0.24

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 FH460 thickness range and delivery condition

CCS FH460 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 FH460 equivalent grades

CCS FH460 equivalent grades of other classification societies

Standard / society	Equivalent grade
IACS UR W16	FH460
ABS	AB/FQ47
DNV	VL F460
LR	LR FH46
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 FH460 FAQ

Is CCS F460 the same as CCS FH460?

Yes. CCS lists the grade as FH460; F460 is a common shorthand for the same steel.

What is the yield strength of CCS FH460?

Minimum 460 MPa up to 50 mm, 430 MPa for 50–100 mm and 390 MPa for 100–250 mm. Tensile strength is 540–720 MPa (up to 100 mm).

What is the impact test temperature of CCS FH460?

−60°C, with a minimum average of 31 J transverse or 46 J longitudinal.

What is CCS FH460 equivalent to?

FH460 in IACS UR W16, ABS AB/FQ47, DNV VL F460 and LR FH46. ASTM A131 has no grade at this strength.

How is CCS FH460 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 FH460 plate?

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

What is the CEV of CCS FH460?

Ceq maximum for plates up to 50 mm is 0.45% (TM), 0.47% (QT). Higher limits apply to thicker plates.

What is the difference between CCS FH460 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/F460
DNV	GL	LR	BV	ABS	NK	KR	RINA
NV F460	GL-F460	LR/FH46	BV/F460	AB/FQ47	K F47	R F47	RI/F460

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Related steel grades: CCS/A460, CCS/D460, CCS/F460, CCS/F500