ch 39 metal urgy

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pre heat temperatures for carbon steel range from depending on carbon content

200 to 700

the clip test is not applicable produces good results on sections up to thick

3/8

preheating temperatures for stress relief should be in the range of

900 to 1250

steels are the easiest to Weld since now special welding preparations are necessary

LOW carbon

steel is suitable for cold bending and cold forming because it's high ductility

RIMMED

Ben Knight is more brittle than martensite informs A at a faster coin rate

false

high carbon steels are significantly easier to Weld than other carbon steels

false

hydrogen cracking is commonly detected by common non destructive's amination techniques

false

in semi killed still no deoxidizers are added during production

false

post heating temperatures for chromoly steels are typically lower than for carbon and low alloy steels

false

the ductility of autistic magnis steals increases when the steels are reheated

false

is not normally used to Weld free machining steels

gtaw

in free machining steels can melt during welding an meeting Weld fumes an creating health hazard

lead

Welding current in welding speed must be used when welding chromoly steals

low slow

is the process of removing a controlled amount of oxygen from steel during steelmaking

steel deoxidation

Carbon steels are alloys of iron carbon and magnesium

true

Graphite alization is the formation of iron carbide that results in loss of ductility

true

carbon is the alloying metal that has the greatest effect on the mechanical properties of steel

true

carbon steel with a carbon equivalent less than zero point 4% is weldable without pre heat or post heating depending on joint member thickness

true

free machining steels are not usually welded unless absolutely necessary

true

killed steel is completely deoxidized during steel production by adding Silicon or aluminum

true

martin site that forms an low carbon steels is generally too soft and ductile to cause an brenneman or cracking

true

medium carbon steels are stronger than low carbon steels

true

post heating is a stress relief treatment for welding medium carbon in high carbon steels

true

rimmed steel is steel with little or no deoxidizers added during steel production

true

the interpass temperature is the temperature of a wild area between passes of a multiple pass Weld

true

the recommended Preheat temperature for low alloy steel is about 50 degrees Fahrenheit above the temperature at which marked insight begins to form on cooling

true


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