Hi Friend,Dont confuse with all these explanation.The simple way,the basic metallurgy says the material which contains upto 2% carbon is accounted as steel.Above 2% carbon it is considered as cast Iron.You can confirm with IRON-CARBON equilibrium diagramwith thanks & regards,N.Shanmuga sundaram,QA/QC Welding/painting Inspector,Moody International,UAEOn Wed, Jan 5, 2011 at 8:25 AM, Barry Gideon <barry@arv-offshore.com> wrote:
--Can anyone advise me where I can find the definition for CARBON STEEL and LOW ALLOY CARBON STEEL (Preferably an explicit definition by ASTM and the relevant standard number/description).
Form a web search I have found the following definitions :
AISI defines carbon steel as follows: Steel is considered to be carbon steel when no minimum content is specified or required for chromium, cobalt, columbium [niobium], molybdenum, nickel, titanium, tungsten, vanadium or zirconium, or any other element to be added to obtain a desired alloying effect; when the specified minimum for copper does not exceed 0.40 per cent; or when the maximum content specified for any of the following elements does not exceed the percentages noted: manganese 1.65, silicon 0.60, copper 0.60.
Alloy or alloyed steels are defined by the ISO specification 4948/1 in the following manner. Alloy steels are those containing any element listed below in a quantity equal to or greater than the quantity for that listed element: aluminium 0.10%, boron 0.008%, bismuth 0.10%, chromium 0.30%, cobalt 0.10%, cupper 0.40%, manganese 1.65%, molybdenum 0.06%, lead 0.40%, selenium 0.10%, silicon 0.50%, tellurium 0.10%, titanium 0.05%, tungsten 0.10%, vanadium 0.10%, zirconium 0.05%, Lanthanides (each) 0.05%, other specified elements (except carbon, sulphur, phosphorus, nitrogen) 0.05% [Ref 1].
Various attempts have been made to distinguish 'low' and 'high' alloy carbon steels, but the definitions vary between countries and between standard-setting organisations. As a general indication, low alloy steel can be regarded as alloy steels (by the ISO definition) containing between 1% and less than 5% of elements deliberately added for the purpose of modifying properties.
However, AISI defines low alloy steels as a constitute to a category of ferrous materials that exhibit mechanical properties superior to plain carbon steels as the result of additions of alloying elements such as nickel, chromium, and molybdenum. Total alloy content can range from 2.07% up to levels just below that of stainless steels, which contain a minimum of 10% chromium.
Regards
Barry Gideon
ARV Offshore Co., Ltd.
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