Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB333359A
Inventor
Colin John Swanson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
National Smelting Co Ltd
Original Assignee
National Smelting Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by National Smelting Co LtdfiledCriticalNational Smelting Co Ltd
Priority to GB333359ApriorityCriticalpatent/GB864196A/en
Publication of GB864196ApublicationCriticalpatent/GB864196A/en
C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
C22C—ALLOYS
C22C11/00—Alloys based on lead
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Chemical & Material Sciences
(AREA)
Engineering & Computer Science
(AREA)
Materials Engineering
(AREA)
Mechanical Engineering
(AREA)
Metallurgy
(AREA)
Organic Chemistry
(AREA)
Mold Materials And Core Materials
(AREA)
Abstract
A method of reducing the shrinkage porosity and improving the surface quality of lead castings, such as used for radiation shield lead bricks, comprises the addition of arsenic (e.g. in form of a master lead-arsenic alloy) to the lead being cast. In the casting, the arsenic may be present in proportions between 0.6% and 1.4% by weight. The addition of 1% arsenic reduces the ductility, but increases the tensile strength and hardness of the lead.
GB333359A1959-01-301959-01-30Improvements in or relating to lead castings
ExpiredGB864196A
(en)