Product Uses and Introduction

This series of products is for shipbuilding steel, and the material selection needs to be determined based on the specific circumstances. Below, we will introduce the thickness range, delivery condition, and applicable standards for each grade that we can provide. We hope this information is helpful. If you have any questions about the products or need a quote, please contact us via email. Because some grades can be categorized into multiple types according to their applications, this may cause some inconvenience in your search, for which we sincerely apologize. We also welcome any suggestions you may have. Thank you very much!

Spot inventory inquiry Spot inventory

If conditions permit, we can also provide steel mill customization services, where the thickness, width, and length can all be made to your needs, just like a tailor making clothes for you, implementing personalized orders.

Customized business email for steel mills： customize@cehesteel.com

Ship Classification Society

Scope of supply

Ship Classification Society Variety Grade Thickness（mm） Delivery status Remarks
LR  BV ABS DNV KR NK RINA RS CCS Ordinary ship plate A/B/D/E ≤100 TM RS≤80;RINA
A/B ≤50 AR
≤130 N
D ≤35 AR
≤130 N
E ≤130 N
LR  BV ABS DNV KR NK RINA RS CCS High-strength ship plate AH32/DH32
AH36/DH36		 ≤20 AR
≤40 CR(NR)
≤100 N RS≤80
EH32/EH36 ≤100 N RS≤80
AH/DH/EH32/36 ≤100 TM LR/NK/KR/ RINA≤80; BV≤88
AH40/DH40/EH40 ≤100 TM LR/NK/KR/ RINA≤68; BV≤88
LR、ABS、CCS
DNV、RINA、RS		 Ultra-high strength ship plate AH420~ FH690
AQ43~FQ70
AO420~FO690		 ≤160/90 QT RINA≤50;Not includeNK/KR/BV
AH420~EH500
AQ43~EQ51
AO420~EO500		 ≤80 TM Not include LR/KR/RINA
LR
NK
RINA
RS
LR
ABS
DNV
CCS
RS		 High-toughness ship plate FH32/FH36/FH40 ≤68 TM
Crack-resistant steel EH36/EH40/EH47-BCA1 COD ≤100 TM Steel for ultra-large container ships
EH40/EH47-BCA2 COD ≤100 TM
LTAH27S~LTEH36 ≤80 TM Used for liquefied petroleum gas and liquid ammonia ship storage tanks
LR
BV
ABS
CCS
DNV
KR
CCS
BV		 Low-temperature carbon manganese steel LTAH27S~LTEH36 ≤80 N
LTFH27/32/36
LTAH40~FH40		 ≤68 TM
410/460/510/550LE/LFCL-I-2~CL-III-4 V/VH32/VH36-OXX NV 2-2/3/4/4L, NV4-2/3/4/4L  KL24A/B, KL27/33/37
RL235A/B, RL325A/B, RL360		 ≤40 TM
LR
BV
ABS
CCS
DNV
KR
RS
CCS
BV		 Low-temperature nickel alloy steel 9Ni/X8Ni9/X7Ni9/9N490 ≤50 QT Storage tanks and fuel tanks for liquefied natural gas carriers
≤30 NNT
5Ni/X12Ni5/5N390 ≤50 QT
Marine composite plates Substrate：AH32/36, DH32/36 ≤30 TM Used for chemical transport ships and nuclear-powered icebreakers
Covering material：S22053,S22253,S32205,S31803 ≤4
Substrate：AH/DH/FH32/36/40 ≤49
Covering material：S32205,S31803,304L/316L/317L ≤5
EN 10225-1 Offshore steel S355MLO(S355G7/G9+M) ≤80 TM Offshore Platforms
S420MLO(S420G1+M)
S460MLO(S460G1+M)
API API 2W-50/60
ASTM A514/514M Gr.Q(MODIFIED) ≤178 QT
A517/517M Gr.Q(MODIFIED)

Grades and chemical compositions of general strength and high strength steel

Grade Chemical Compositionb,c(Quality Fraction)/%
C Si Mn P S Cu Cr Ni Nb V Ti
A ≤0.21 ≤0.50 ≥0.50 ≤0.035 ≤0.035 ≤0.35 ≤0.30 ≤0.30 一 一 一
B ≤0.35 ≥0.80
D ≥0.60 ≤0.030 ≤0.030
E ≤0.18 ≥0.70 ≤0.025 ≤0.025
AH32 ≤0.18 ≤0.50 0.90~1.60 ≤0.030 ≤0.030 ≤0.35 <0.20 ≤0.40 0.02~0.05 0.05~0.10 ≤0.02
AH36
AH40
DH32 ≤0.025 ≤0.025
DH36
DH40
EH32
EH36
EH40
FH32 ≤0.16 ≤0.020 ≤0.020 ≤0.80
FH36
FH40
“Grain-refining elements Al, Nb, and V can be added to steel individually or in any combination. When added individually, their content should comply with the specifications in this table; if two or more grain-refining elements are added in combination, the content of the grain-refining elements in the table should be as specified.

The lower limit requirement does not apply, and it is required that Nb+V+Ti ≤ 0.12%.
"Carbon equivalent of grades A, B, D, and E steelCeq≤0.40%。Carbon equivalent calculation formula: Ceq=C+Mn/6。

Any other added elements should be noted in the quality certificate.

The maximum carbon content of Grade A steel shall not exceed 0.23%.

When performing impact tests on Grade B steel, the lower limit for Mn content can be as low as 0.60%.

For D and E grade steels with a thickness greater than 25 mm, the aluminum content should comply with the specifications in the table. Other grain-refining elements may be used upon consultation between the supplier and the buyer.

When the thickness of AH32 to EH40 grade steel is no more than 12.5 mm, the minimum Mn content can be 0.70%.

h:When F-grade steel contains aluminum, the nitrogen content shall not exceed 0.012%.

i:The total aluminum (Alt) content can be measured instead of the acid-soluble aluminum (Als) content. In this case, the Alt content should not be less than 0.020%.

Grades and chemical composition of ultra-high strength steel

Grade Delivery status Chemical Composition(Quality Fraction)/%
C Si Mn P S Cu Cr Ni Nb Vb Ti Mo N Alt
AH/DH420
AH/DH460
DH460		 N/NR ≤0.20 ≤0.60 1.00~1.70 ≤0.030 ≤0.025 ≤0.55 ≤0.30 ≤0.80 ≤0.05 ≤0.20 ≤0.05 ≤0.10 ≤0.025 ≥0.020
EH420/460 ≤0.18 ≤0.025 ≤0.020
AH/DH420 AH/DH460 AH/DH420 AH/DH500  AH550 TM ≤0.16 ≤0.60 1.00~1.70 ≤0.025 ≤0.015 ≤0.55 ≤0.50 ≤2.00 ≤0.05 ≤0.12 ≤0.05 ≤0.50 ≤0.025 ≥0.020
DH550 AH/DH620 AH/DH690  AH/DH790  AH890 TM ≤0.16 ≤0.60 1.00~1.70 ≤0.025 ≤0.015 ≤0.55 ≤0.50 ≤2.00 ≤0.05 ≤0.12 ≤0.05 ≤0.50 ≤0.025 ≥0.020
EH/FH420 EH/FH460 EH/FH500 EH/FH550 EH/FH620 EH/FH690 EH/FH790 EH/FH890 ≤0.14 ≤0.020 ≤0.010
FH500  EH/FH550 EH/FH620 EH/FH690 EH/FH890 EH/FH960 QT ≤0.18 ≤0.80 ≤1.70 ≤0.020 ≤0.010 ≤0.50 ≤1.50 ≤2.00 ≤0.06 ≤0.12 ≤0.05 ≤0.70 ≤0.015 ≥0.018
The P and S content of the structural steel is allowed to be 0.005% higher than the values ​​specified in the table.

Except for quenched and tempered steel,Nb+V+Ti≤0 .26% and Mo+Cr≤0 .65%。

With the consent of both the supplier and the buyer, the Ni content may be appropriately increased.

The minimum ratio of total aluminum to nitrogen should be 2:1.When other nitrogen-fixing elements are used, minimum aluminum content and aluminum-nitrogen ratio are not required.

Oxygen content[O]≤50×10-6。

Oxygen content[O]≤30×10-6。

When boron is intentionally added to enhance the hardenability of steel, the boron content should not exceed 0.005%.

Mechanical properties of general strength and high strength steel

Grade Tensile test a, b Charpy (V-notch) impact test
Upper yield strength

(ReH)/MPa		 Tensile strength

(Rm)/MPa		 Elongation after fracture

(A)/%		 Test temperature/℃ The following are the impact absorption energy (KV₂)/J for thicknesses (mm).
≤50 >50～70 >70～150
Vertical Horizontal Vertical Horizontal Vertical Horizontal
≥
A ≥235 400～520 ≥22 20  — — 34 24d 41d 27d
B 0  27° 20° 34 24 41 27
D -20 
E -40 
AH32 ≥315 450～570 0  31  22  38  26  46  31 
DH32 -20 
EH32 -40 
FH32 -60 
AH36 ≥355 490～630 ≥21 0  34  24  41  27  50  34 
DH36 -20 
EH36 -40 
FH36 -60 
AH40 ≥390 510～660 ≥20 0  41  27  46  31  55  37 
DH40 -20 
EH40 -40 
FH40 -60 

Mechanical properties of ultra-high strength steel

Steel Grade Delivery status Tensile test，b,e Charpy (V-notch) impact test
Upper yield strength(ReH)/MPa Tensile strength(Rm)/MPa Elongation after fracture(A)/% Test temperature/℃ Impact absorption energy
 (KV₂)/J
Thickness / m m
3～50 >50~100 >100~250 3～100 >100~250 Horizontal Vertical Vertical Horizontal
AH420 N、NR、TM、QT ≥420 ≥390 ≥365 520~680 470~650 ≥19 ≥21 0  ≥42 ≥28
DH420 -20 
EH420 -40 
FH420 -60 
AH460 N、NR、TM、QT ≥460 ≥430 ≥390 540~720 500~710 ≥17 ≥19 0  ≥46 ≥31
DH460 -20 
EH460 -40 
FH460 -60 
AH500 TM、QT ≥500 ≥480 ≥440 590~770 540~720 ≥17 ≥19 0  ≥50 ≥33
DH500 -20 
EH500 -40 
FH500 -60 
AH550 TM、QT ≥550 ≥530 ≥490 640~820 590~770 ≥16 ≥18 0  ≥55 ≥37
DH550 -20 
EH550 -40 
FH550 -60 
AH620 TM、QT ≥620 ≥580 ≥560 700~890 650~830 ≥15 ≥17 0  ≥62 ≥41
DH620 -20 
EH620 -40 
FH620 -60 
AH690 TM、QT ≥690 ≥650 ≥630 770~940 710~900 ≥14 ≥16 0  ≥69 ≥46
DH690 -20 
EH690 -40 
FH690 -60 
AH790 TM、QT ≥790 ≥740 一 840~1000 800~1000 ≥13 ≥15 0  ≥69 ≥46
DH790 -20 
EH790 -40 
FH790 -60 
AH890 TM、QT ≥890 ≥830 一 940~1100 一 ≥1l ≥13 0  ≥69 ≥46
DH890 -20 
EH890 -40 
AH960 QT ≥960 一 一 980~1150 一 ≥10 ≥12 0  ≥69 ≥46
DH960 -20 
EH960 -40 
For sheet metal tensile and impact tests, transverse specimens are used; for profiles and bars, longitudinal specimens are used.

When the yield strength is not obvious, the specified plastic elongation strength Rp0.2 can be measured instead of the upper yield strength.

If required by the buyer, the yield strength ratio may be no greater than 0.94, subject to negotiation between the supplier and the buyer and specified in the contract.

Mechanical properties of high-strength steel used in ABS and DNV standard welded structures

Steel Grade Tensile properties V-notch impact, KV2 average value J
ReH,MPa Rm,MPa A,% Temperature℃ Longitudinal impact
AQ43、A420 ≥420 530~680 ≥18 0  31 
DQ43、D420 -20 
EQ43、E420 -40 
AQ47、A460 ≥460 570~720 ≥17 0  46 
DQ47、D460 -20 
EQ47、E460 -40 
AQ51 ≥500 610~770 ≥16 0  50 
DQ51 -20 
EQ51 -40 
AQ56 ≥550 670~835 ≥16 0  55 
DQ56 -20 
EQ56 -40 
AQ63 ≥620 720~890 ≥15 0  62 
DQ63 -20 
EQ63 -40 
AQ70 ≥690 770~940 ≥14 0  69 
DQ70 -20 
Eq70 -40 
Note: 1. Z-axis plates (Z25, Z35) have a minimum thickness of 15mm.
2、DNV's A, B, and D grade Z-axis plates for thick plates are not supplied for hot rolling delivery.
3、E-grade board width>2500mm and thickness≤16mm diameter items must be heat-treated before delivery.
4、When the impact temperature is the impact temperature≤-40℃,Finished width≥2800mm，thickness70~80mm ，the length must be between 7500 and 9000 mm.
5、For grades conforming to GB/T712 and ASTM A131/A131M standards, all steel grades with N-grade steel can be delivered up to 100mm, and grades A, B, and D with AR-grade steel can be delivered up to 60mm.