Stressproof rounds offer a combination of high strength and
excellent machinability. They are produced by a patented process
which entails drawing the bar through a special die under heavy
draft, then stress relieving it in a precisely controlled furnace. The
resulting bar offers strength without heat treating, wearability
without case hardening and outstanding machinability and tool
life. Stressproof is produced from AISI 1144 carbon steel.
Although Stressproof is certified to ASTM A311, it offers
additional quality features not included in this spec. Examples are
seam depth specification, warpage testing and machining testing
which are all intregal parts of the quality assurance program.
Stressproof is often used for parts requiring mechanical properties
obtained by heat treating to a hardness range of 23-30 Rockwell
C (Rc) after machining. The machinability rating is 83 % of 1212
screw stock with an average surface cutting speed of 140 feet per
minute. Because Stressproof is a resulfurized steel, welding is
STRESSPROOF is a registered trademark of the Niagara Lasalle Corporation.
|(The following values are average and should be considered as representative of the grade.)|
(7% min above 3")
(20% min above 2")
Size Range is 1/4" dia thru 4 1/2" dia. Stock lengths are 12 ft. long, also available cut to size...
|Size range in inches ||+ 0||Minus in Inches
|1/4" to 1 1/2" incl. ||0.004"
|Over 1 1/2" to 2 1/2" incl. ||0.005"
|Over 2 1/2" to 4" incl. ||0.006"
|Over 4 to 4 1/2" incl. ||0.007"