EH36

EH36  AH36, DH36, EH36 Steel Plate for Shipbuilding

Shipbuilding steel plate refers to the carbon and alloy steel plate used in offshore and marine constructions, common grades are A, B, D, E, AH32/36/40, DH32/36/40, and EH32/36/40 which ranged from different strength. The plates usually used to manufacture ship hulls, bulkheads, upper decks and hatch covers for tankers, bulk carriers, container ships and LNG carriers.

AH36, DH36, EH36 Steel – Common Use High Strength Steel in Offshore & Marine

 

For the high strength shipbuilding plates like AH36, DH36, EH36 steel plate, they have been widely used in high stress areas of ships, comparing with general strength steel, they are offering the same strength with the smaller thickness.

Materials

Shipbuilding steel material in carbon and alloy steel, compatible with high strength, low temperature and high heat input soldering.

Grades: A, B, D, E, AH32/36/40, DH32/36/40, EH32/36/40

According to its yield strength, shipbuilding plate of can be divided into below grades:

  • Grade A steel is the impact force subjected to normal temperature (20 ° C).
  • Grade B steel impact force at 0 °C.
  • Grade D steel impact force at -20 °C.
  • Grade E steel impact force at -40 °C.
  • High-strength shipbuilding steel plate can be further divided into: AH32, DH32, EH32; AH36, DH36, EH36 and AH40, DH40, EH40.

 

  1. The general grades A, B, D, and E are distinguished according to the impact temperature of the steel. The impact values of all grades of steel are the same.
  2. High-intensity hull structure steel preheating requirements: For all AH, DH, EH plate thickness greater than 30mm angle, butt joints, shall be preheating to 120 ~ 150 °C before welding.
  3. For thickness of the plate ≤ 30mm, the ambient temperature is below 5 ° C, preheated to 75 ° C; Ambient temperature below 0 ° C, preheated to 75 ~ 100 ° C.

Chemical and Mechanical Requirements

Elements C Mn Al Si P S
AH32 ≤0.18 0.7~1.60 ≥0.015 0.10~0.50 ≤0.04 ≤0.04
DH32 ≤0.18 0.90~1.60 ≥0.015 0.10~0.50 ≤0.04 ≤0.04
EH32 ≤0.18 0.90~1.60 ≥0.015 0.10~0.50 ≤0.04 ≤0.04
AH36 ≤0.18 0.7~1.60 ≥0.015 0.10~0.50 ≤0.04 ≤0.04
DH36 ≤0.18 0.90~1.60 ≥0.015 0.10~0.50 ≤0.04 ≤0.04
EH36 ≤0.18 0.90~1.60 ≥0.015 0.10~0.50 ≤0.04 ≤0.04

 

C (carbon) is an indispensable strengthening element in steel, but the increase in C content reduces the low-temperature impact toughness of steel and deteriorates the weldability of steel. Therefore, it is necessary to control the C content in the steel.

According to the experience of producing aluminsum-containing steel, in order to ensure the aluminium content in the steel and the fluidity of the molten steel, the method of pre-deoxidation is strictly to control the carbon content of the end point and the alloying of the large-pack alloy to control the oxidation of the molten steel. The way of adding aluminium.

 

Processing for Different Grades

Grade A and B

The general strength of grade A and B shipbuilding steel plates can meet the requirements of process and mechanical properties through ordinary rolling, so the production process is relatively simple.

Grade D, E (DH32, DH36, EH 32, EH 36)

Grade D and E series (inlcuding AH32/36, DH32, DH36, EH32, EH36) shipbuilding steel plates require good low temperature toughness and good welding performance. The production high-strength shipbuilding steel plate needs to be normalized by means of controlled rolling and controlled cooling or heat treatment processes with more complete equipment. At the same time, the internal steel purity of the supplied billets is required to be high, especially the content of S, P, N, 0 and H in the steel should be strictly controlled.

Alloy Elements Added to Improve Toughness

In order to ensure the performance of high-strength ship plates, micro-alloying technology is adopted. By adding Nb, V, Ti and other alloying elements to the steel, combined with the controlled rolling process, the grain is refined and the toughness is improved.

 

In order to ensure good low temperature impact toughness of the steel grade, the rolling of the 355MPa class ship plate adopts a strict type II controlled rolling process.

                                                    Mechanical Properties

 

Steel Grade

 

Thickness/mm

Yield point/ MPa

Tensile strength/ MPa

Elongation/ %

V-type impact test
Temperature/

Average impact absorption ​

workAkv/J

Vertical Horizontal
A ≤50 ≥235 400~490 ≥22
B ≤50 ≥235 400~490 ≥22 0 ≥27 ≥20
D ≤50 ≥235 400~490 ≥22 -10 ≥27 ≥20
E ≤50 ≥235 400~490 ≥22 -40 ≥27 ≥20
AH32 ≤50 ≥315 440~590 ≥22 0 ≥31 ≥22
DH32 ≤50 ≥315 440~590 ≥22 -20 ≥31 ≥22
EH32 ≤50 ≥315 440~590 ≥22 -40 ≥31 ≥22
AH36 ≤50 ≥355 490~620 ≥22 0 ≥34 ≥24
DH36 ≤50 ≥355 490~620 ≥22 -20 ≥34 ≥24
EH36 ≤50 ≥355 490~620 ≥22 -40 ≥34 ≥24
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Low Mang Kok B: Klang, Selangor, 18.12.1973; P: Low Chong Seng 1948; Lee Sok Yen 1952; MS: Chua Hooi Koon 1976; Ch: Low Chun Leong 1998; Low Chun Ee 2002; E: 1980 - 1985 SJK (C) Pin Hua 1 - Primary School; 1986 - 1991 SM Kwang Hua - Secondary School; 1992 - 1993 College WIT - Electronic technician; Ca: 1992 - 1993 Lion Suzuki Motor Sdn. Bhd. - Sales Executive; 1993 - 1994 Great Eastern Life Assurance (Malaysia) Berhad - Insurance Agent; 1994 - 1998 Kimwin Special Steel Sdn. Bhd. - Sales Executive; 1998 - 2000 ASSAB Steels (Malaysia) Sdn. Bhd. - Sales Engineer ; 2000 - 2004 Kimwin Special Steel Sdn. Bhd. - Freelancer Sales ; 2004 - 2010 EE TECK Marketing - Founder and Managing Director; 2010 - 2019 E Steel Sdn. Bhd - Founder and Managing Director; WaCW: Global Business Magazine - Asia Pacific Top Excellence Brand 2011; International Prestige Brand Award Book & Record 2017; Aw: Asia Pacific Top 100 Excellence Brand In Year 2011; International Prestige Brand Of The Year 2017; Me: China Entrepreneur Club; LS: English, Malay, Mandarin, Cantonese, Teochew, Hokkien; H: Gardening; Online Marketing; PMM: To develop Steel business globally through online new business model; RoS: Self discipline; Keep learning and always look for solution instead focus on problem; Web: www.esteelsuppliers.com Your index: Industry, Trade and Services Successful People in Malaysia (2nd Edition) Release date: December 2020 ( BPH - British Publishing House Ltd )