<http://webisa.webdatacommons.org/213903589>	<http://www.w3.org/ns/prov#value>	"Tempering martensitic steel???i.e., raising its temperature to a point such as 400?? C and holding it for a time???decreases the hardness and brittleness and produces a strong and tough steel." .
<http://webisa.webdatacommons.org/213903589>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<britannica.com> .
<http://webisa.webdatacommons.org/213903589>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/prov/131401727>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/213903589> .