News Center
ask:
Does anyone know what's the difference between AH36 and DH36 steel plates? When comparing DH36 and AH 36 chemical composition I can't see any difference. Comparing mechanical properties, only difference is in minimal impact energy. What is the difference than??
Answer:
As noted by several, the chemical composition of AH and DH is the same, indeed this is also true for EH grade too. It all relates to the thickness and mechanical properties at that thickness of the plate you wish to use. Since the thicker you go, "as-rolled" is different from that of say thermochemically treated which is of course again different from quenched or normalised.
So guaranteeing properties of basic quenched steel in say 10mm thick, is not difficult. But when using say 50mm thick, very difficult to ensure a consistent grain size. Thus different treatments are used to ensure with an ever increasing thickness, so the mechanical properties can be guaranteed. This is supplement by the Charpy V-notch test. So at an ever increasing thickness the Charpy V-notch test has a different temperature and energy requirement, depending upon the AH, Dh etc grade. Thus, it relates to the quality control of the steel with an ever increasing thickness, which is dictated by the temp range and notch toughness range.
LR and DNV requirements are shown below. As you can see, for an AH grade testing is done at 0c less than 50mm thick. But in DH it is done at -20c. The values change as you increase the thickness (as in different Class values and locations noted above) from less than 50mm up to 100mm.
GB T 5312 Carbon and carbon-manganese steel seamless steel tubes and pipes are mainly for ship use, also known as shipbuilding steel pipes. Under GB T 5312, there are mainly 5 steel grades: grade 320, 360, 410, 460 and 490. Each grade covers three levels: I, II, III.
Angle steel, commonly known as angle iron, is a long strip of steel whose sides are perpendicular to each other. There are equal angle steels and unequal angle steels. The two sides of equal angle steel are equal in width. The unequal angle steel is also known as L shape profile steel.
Flat bar steel can be produced according to the user's needs, with fixed thickness, width and length. It can reduce the cutting process for users, reduce the consumption of labor and materials, and also reduce the processing loss of raw materials.
Bulb flat steel for shipbuilding
The bulb flat steel is a kind of medium section material which is mainly used in the field of shipbuilding and bridge building, and the shipbuilding bulb flat steel is an auxiliary medium section material for shipbuilding.
The steel for shipbuilding and oil platform---FH40, is the high tensile strength steel.The shipbuilding steel FH40 is the Hull structural steel.We can provide FH40 shipbuilding steel plate price.
The steel for shipbuilding and oil platform---EH40, is the high tensile strength steel.The shipbuilding steel EH40 is the Hull structural steel.We can provide EH40 shipbuilding steel plate price.
If you are interested in our company or products, welcome to visit our company or local offices; you can also get contact with us through online consulting, demand table submission, e-mails and telephones. Our staff shall wholeheartedly provide product information, application knowledge and good service for you.
BBN SHIP STEEL FACTORY
