7/8/2014 What is the difference between LTCS and Carbon steel?

https://answers.yahoo.com/question/index?qid=20090414082254AAK6jg7 1/2

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What is the difference between LTCSand Carbon steel? Whats the difference in composition? When LTCS is used generally?Whats the temperature range, that these materials can be used? Isthere any relation between Killed carbon steel, LTCS, stainless steel,carbon steel(normal)? How to categorise/classify these?

Thankyou very much in advance..

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Best Answer

alpha b answered 5 years ago

*Steel is considered to be carbon steel when no minimum content isspecified or required for chromium, cobalt, columbium [niobium],molybdenum, nickel, titanium, tungsten, vanadium or zirconium, or anyother element to be added to obtain a desired alloying effect; when thespecified minimum for copper does not exceed 0.40 per cent; or whenthe maximum content specified for any of the following elements doesnot exceed the percentages noted: manganese 1.65, silicon 0.60,copper 0.60.

*Low-temperature carbon steels have been developed chiefly for use inlow-temperature equipment and especially for welded pressure vessels. They are low- to medium-carbon (0.20 to 0.30%), high-manganese (0.70to 1.60%), silicon (0.15 to 0.60%) steels, which have a fine-grainstructure with uniform carbide dispersion. They feature moderatestrength with toughness down to — 50°F (—46°C). For grain refinement and to improve formability and weldability, carbonsteels may contain 0.01 to 0.04% columbium. Called columbium steels,they are used for shafts, forgings, gears, machine parts, and dies andgages. Up to 0.15% sulfur, or 0.045 phosphorus, makes them free-machining, but reduces strength.

*LTCS is a Nickel based alloy steel plates especially used for lowtemperature applications below - 150 deg F. Mainly used in cryogenicconstruction of space ships, low temperature application in chemicalplant below -55 deg C.

Examples:

SA-203 Steel Plate Grades A, B, D, E and F Nickle Alloy Steel Plates.For low temperatures (-150 deg F)

Low Temperature Carbon Steel Tubes ASTM A334 Gr.1

ASTM A333——Seamless and Welded Steel Pipe for Low-TemperatureService: Mainly Grade： Grade 1, Grade 3, Grade 4, Grade 6, Grade 7, Grade 8, Grade 9, Grade10, Grade 11

*ASTM A420 For LTCS Fittings.

*A350-LF2 is a standard For Flanges.

**Steel that are generally killed include:

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7/8/2014 What is the difference between LTCS and Carbon steel?

https://answers.yahoo.com/question/index?qid=20090414082254AAK6jg7 2/2

Other Answers (1)

Comment5 0

· Steels with carbon contents greater then 0.25%

· All forging grades of steel.

· Structural steels with carbon content between 0.15 to 0.25%.

· Some special steel in the lower carbon ranges.

See the classification of carbon steel clicking source links.

*There is a relation between Killed carbon steel, LTCS, stainless steel,carbon steel(normal) and it is the iron,carbon and different alloyingelements in varying quantity which makes them fall under differentcategories.

Source:http://www.seamless-steel-pipes.com/ASTM...

http://steel.keytometals.com/Articles/Ar...

Comment0 0

Santanu answered 4 months ago

many thanks for your explanation.

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