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ASTM A543/A543M 2009 Edition, October 1, 2009
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Standard Specification for Pressure Vessel Plates, Alloy Steel, Quenched and Tempered Nickel-Chromium-Molybdenum
Includes all amendments and changes through Reapproval Notice , 2014
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This specification2 covers nickel-chromiummolybdenum alloy steel plates for use in the quenched and tempered condition, intended for the fabrication of welded pressure vessels and other pressure equipment. These alloy compositions are normally considered for construction involving plate thicknesses of 2 in. [50 mm] or greater.

Material under this specification is available in two types, B and C.

The maximum thickness of plates is limited only by the capacity of the chemical composition to meet the specified mechanical property requirements.

The minimum plate thickness is 316 in. [5 mm].

These alloy steel plates in the as-rolled condition are sensitive to cracking during flame cutting, transit, and handling. They should be shipped in the as-rolled condition only with the mutual agreement of the manufacturer and the purchaser or fabricator.

The values stated in either inch-pound units or SI units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system must be used independently of the other. Combining values from the two systems may result in nonconformance with the specification.

2 For ASME Boiler and Pressure Vessel Code applications, see related Specification SA-543 in Section II of that Code.