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ASTM A 649/A 649M Document Information:
Title
Standard Specification for Forged Steel Rolls Used for Corrugating Paper Machinery
ASTM International
Publication Date:
Sep 1, 2004
Scope:
(Footnote *)
This specification(Footnote 2) covers two kinds of rolls used in
machinery for producing corrugated
paperboard. Rolls are fabricated of forged bodies and trunnions. The
trunnions may be bolted or
shrink assembled on one or both ends of the body. A seal weld may be
made at the body/trunnion
interface. Roll shells are made of carbon/manganese, or low alloy
steel as hereinafter described,
and are heat treated prior to assembly. Pressure rolls are surface
hardened. Provision is made in
Supplementary Requirement S1 for the optional surface hardening of
corrugating rolls.
Corrugating and pressure rolls made to this specification shall not
exceed 30 in. [760 mm] in
inside diameter. The wall thickness of the roll body shall not be less
than 1/12 of the inside
diameter or 1 in. [25 mm], whichever is greater, but shall not exceed
4 in. [100 mm]. The wall
thickness of the corrugating roll is measured at the bottom of the
corrugations in the location of
the trunnion fit. The maximum design temperature (MDT) of the roll is
600°F [315°C] and the
maximum allowable working pressure (MAWP) is 250 psi [1.7 MPa]. The
minimum design temperature
shall be 40°F [4°C] for roll wall thicknesses up to 3 in. [75
mm]. For roll wall
thicknesses over 3 in. [75 mm] to 4 in. [100 mm], the minimum design
temperature shall be 120°F
[50°C]. The maximum stresses on the roll bodies from the combined
internal and external loading
are limited to 18 750 psi [129 MPa] for the Class 2 pressure roll
bodies, and 20 000 psi [138 MPa]
for Class 1A, 1B, or 5 pressure or corrugating roll bodies in Grades 1
or 2. For the trunnions, the
maximum stresses from the combined internal and external loading are
limited to 15 000 psi [103.4
MPa] for Classes 3 or 4, or 20 000 psi [138 MPa] for Classes 1A, 1B,
or 5 in Grade 2 only. The
Grade 1 strength level is not permissible for trunnions.
Referring to Table 1, material to Classes 1A, 1B, or 5 shall be used
for the manufacture of
corrugating or pressure roll shells, and Class 2 shall be used only
for pressure roll shells.
Trunnions shall be made from forgings in Classes 1A, 1B, or 5 in Grade
2 strength level as
restricted by Footnote B in Table 2 or in forgings in either Class 3
or 4.
The values stated in either inch-pound units or SI [metric] units are
to be regarded separately as
standards. Within the text and tables, the SI units are shown in
brackets. The values stated in
each system are not exact equivalents; therefore, each system must be
used independent of the
other. Combining values from the two systems may result in
nonconformance with the specification.
Unless the order specifies the applicable "M" specification
designation, the material shall be
furnished to the inch-pound units.
Except as specifically required in this standard, all of the
provisions of Specification A 788
apply.
Footnote * - A Summary of Changes section appears at the end of this
standard.
Footnote 2 - For ASME Boiler and Pressure Vessel Code applications see
related Specification
SA-649/SA-649M in Section II of that Code.
Keywords:
-
internal pressure
-
machinery - corrugating
-
roll assembly - forged
-
rolls - corrugating
-
rolls - pressure
-
steel forgings - alloy
-
steel forgings - carbon
-
steel rolls
-
surface-hardened
-
trunnions - bolted
-
trunnions - shrink-fitted
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