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GENERAL SCOPE
This low alloy steel containing Chromium and
Molybdenum is the most widely used alloy for oil patch applications. Usually supplied in
the hardened and tempered condition at 22 HRC max. it also finds favor in many
applications requiring higher strength levels up to 150 KSI 0.2% PS. The grade is not NACE
MR0175 approved in these conditions, and should not be used in environments containing H2S.
It is extensively used in tubular form for
downhole tools.
Several hybrid analysis are available all based
on the AISI chemistry. The most common change is to increase the Molybdenum level at 35%
max on diameters, typically greater than 6". Increasing Molybdenum improves the
hardenability.
The hardenability limitations of this grade (depth to
which it will harden / obtain the specified mechanical properties after heat treatment)
must always be taken into account when designing and selecting equipment.
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