ASTM A800/A800M-01(2006)
(Practice)Standard Practice for Steel Casting, Austenitic Alloy, Estimating Ferrite Content Thereof
Standard Practice for Steel Casting, Austenitic Alloy, Estimating Ferrite Content Thereof
SCOPE
1.1 This practice covers procedures and definitions for estimating ferrite content in certain grades of austenitic iron-chromium-nickel alloy castings that have compositions balanced to create the formation of ferrite as a second phase in amounts controlled to be within specified limits. Methods are described for estimating ferrite content by chemical, magnetic, and metallographic means.
1.2 The grades covered by this practice are: CF-3, CF-3A, CF-8, CF-8A, CF-3M, CF-3MA, CF-8M, CF-8C, CG-8M, and CH-10.
1.3 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 practice.
This standard does not purport to address the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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Designation:A800/A800M–01 (Reapproved 2006)
Standard Practice for
Steel Casting, Austenitic Alloy, Estimating Ferrite Content
Thereof
This standard is issued under the fixed designationA800/A800M; the number immediately following the designation indicates the year
of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval.
A superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope E38 Methods for Chemical Analysis of Nickel-Chromium
and Nickel-Chromium-Iron Alloys
1.1 This practice covers procedures and definitions for
E353 Test Methods for Chemical Analysis of Stainless,
estimating ferrite content in certain grades of austenitic iron-
Heat-Resisting, Maraging, and Other Similar Chromium-
chromium-nickel alloy castings that have compositions bal-
Nickel-Iron Alloys
anced to create the formation of ferrite as a second phase in
E562 Test Method for Determining Volume Fraction by
amounts controlled to be within specified limits. Methods are
Systematic Manual Point Count
described for estimating ferrite content by chemical, magnetic,
2.2 Constitution Diagrams:
and metallographic means.
Schoefer Diagram for Estimating Ferrite Content of Stain-
1.2 The grades covered by this practice are: CF-3, CF-3A,
less Steel Castings (1980 revision)
CF-8, CF-8A, CF-3M, CF-3MA, CF-8M, CF-8C, CG-8M, and
Schaeffler Diagram for Estimating Ferrite Content of Stain-
CH-10.
less Steel Weld Metal
1.3 The values stated in either inch-pound units or SI units
DeLong Diagram for Estimating Ferrite Content of Stainless
are to be regarded separately as standard. Within the text, the
Steel Weld Metal
SI units are shown in brackets. The values stated in each
2.3 American Welding Society Specification:
system are not exact equivalents; therefore, each system must
AWS A 4.2, Procedures for Calibrating Magnetic Instru-
be used independently of the other. Combining values from the
ments to Measure the Delta Ferrite Content of Austenitic
two systems may result in nonconformance with the practice.
Stainless Steel Weld Metal
1.4 This standard does not purport to address the safety
concerns, if any, associated with its use. It is the responsibility
3. Terminology
of the user of this standard to establish appropriate safety and
3.1 Definitions:
health practices and determine the applicability of regulatory
3.1.1 ferrite—the ferromagnetic, body-centered, cubic-
limitations prior to use.
microstructuralconstituentofvariablechemicalcompositionin
2. Referenced Documents iron-chromium-nickel alloys. This may be formed upon solidi-
fication from the molten metal (delta ferrite) or by transforma-
2.1 ASTM Standards:
tion from austenite or sigma phase on cooling in the solid state
A351/A351M Specification for Castings, Austenitic, for
(alpha ferrite).
Pressure-Containing Parts
3.1.2 ferrite content—the proportion of total volume of an
A370 Test Methods and Definitions for Mechanical Testing
iron-chromium-nickel alloy present as the ferrite phase.
of Steel Products
3.1.3 ferrite number—the ferrite content expressed as an
A799/A799M Practice for Steel Castings, Stainless, Instru-
arbitrary number based on the magnetic response of the alloy
ment Calibration, for Estimating Ferrite Content
in a weld deposit.
A941 Terminology Relating to Steel, Stainless Steel, Re-
3.1.4 ferrite percentage—the ferrite content expressed as a
lated Alloys, and Ferroalloys
volume percent.
3.1.5 heat treatment—the definitions in Terminology A941
are applicable to this practice.
This practice is under the jurisdiction of ASTM Committee A01 on Steel,
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee
A01.18 on Castings.
Current edition approved March 1, 2006. Published April 2006. Originally Appendix of this practice.
approved in 1982. Last previous edition approved in 2001 as A800/A800M – 01. Metal Progress Data Book, American Society for Metals, Mid June 1977, p.
DOI: 10.1520/A0800_A0800M-01R06. 161.
2 5
For referenced ASTM standards, visit the ASTM website, www.astm.org, or Welding Journal, American Welding Society, Vol 38, No. 7, July 1973, p.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM 293–s.
Standards volume information, refer to the standard’s Document Summary page on Available from American Welding Society (AWS), 550 NW LeJeune Rd.,
the ASTM website. Miami, FL 33126.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
A800/A800M–01 (2006)
NOTE 1—There may be a substantial decrease in the ferrite content of
4. Significance and Use
weld deposits after solution heat treatment in comparison with the
4.1 The tensile and impact properties, the weldability, and
as-deposited value.
thecorrosionresistanceofiron-chromium-nickelalloycastings
may be influenced beneficially or detrimentally by the ratio of
6. General Caution
the amount of ferrite to the amount of austenite in the
6.1 In specifying ferrite content as required in 5.1.3, the
microstructure. The ferrite content may be limited by purchase
purchaser should not set limits that conflict with applicable
order requirements or by the design construction codes gov-
material specification requirements: for example, a maximum
erning the equipment in which the castings will be used. The
limit of 10 % ferrite for Grade CF-3A in Specification A351/
quantity of ferrite in the structure is fundamentally a function
A351M for which the minimum tensile strength requirement is
of the chemical composition of the alloy and its thermal
77 ksi [530 MPa].
history. Because of segregation, the chemical composition,
6.2 When Supplementary Requirement S1 is specified, the
and, therefore, the ferrite content, may differ from point to
purchaser should set ferrite content limits that are compatible
point on a casting. Determination of the ferrite content by any
with the measuring instrument to be used.
of the procedures described in the following practice is subject
to varying degrees of imprecision which must be recognized in
7. Estimation of Ferrite Content
setting realistic limits on the range of ferrite content specified.
Sources of error include the following:
7.1 Estimation in the base metal of the casting by chemical
4.1.1 In Determinations from Chemical Composition—
composition in accordance with the Schoefer diagram (see
Deviations from the actual quantity of each element present in
Appendix X1):
an alloy because of chemical analysis variance, although
7.1.1 A chemical analysis of the heat from which the
possibly minor in each case, can result in substantial difference
castings are poured shall include the following elements
in the ratio of total ferrite-promoting to total austenite-
whether or not required by the chemical requirements of the
promoting elements. Therefore, the precision of the ferrite
product specification: carbon, manganese, silicon, chromium,
content estimated from chemical composition depends on the
nickel, molybdenum, columbium, and nitrogen.
accuracy of the chemical analysis procedure.
7.1.1.1 Upon written agreement between the purchaser and
4.1.2 In Determinations from Magnetic Response—Phases
the producer, an estimated nitrogen content may be reported
other than ferrite and austenite may be formed at certain
instead of an amount determined by analysis of the specific
temperatures and persist at room temperature. These may so
heatifactualchemicalanalyseshavebeenmadefornitrogenin
alter the magnetic response of the alloy that the indicated
a sufficient number of heats of the same alloy type, produced
ferrite content is quite different from that of the same chemical
by the same melting practice, to establish the average nitrogen
composition that has undergone different thermal treatment.
content to be expected.
Also, because the magnets or probes of the various measuring
7.1.2 The ferrite content of the casting shall be estimated
instrumentsaresmall,differentdegreesofsurfaceroughnessor
from the central line of the diagram at the composition ratio of
surface curvature will vary the magnetic linkage with the
“chromium equivalent” (Cr ) to “nickel equivalent” (Ni )
e e
material being measured.
determined from the following formula:
4.1.3 In Determinations from Metallographic
Cr % 1 1.5Si % 1 1.4Mo % 1 Cb % 2 4.99 / Ni %
~ ~ ! ~ ! ~ ! ~ ! ! ~ ~ !
Examination—Metallographic point count estimates of ferrite
130C~%! 1 0.5Mn~%! 1 26~N 2 0.02%! 1 2.77!
percentage may vary with the etching technique used for
5 ~Cr !/~Ni !
e e
identification of the ferrite phase and with the number of grid
points chosen for the examination, as explained inTest Method 7.1.3 When a product analysis is made by the purchaser, it
E562. shall include the elements listed in 7.1.1. If a comparison is
4.2 The estimation of ferrite percent by chemical composi- made of ferrite content estimated from a product analysis
performed by the purchaser, with that estimated from the heat
tion offers the most useful and most common method of ferrite
analysis (see 7.1.1), the reproducibility data in the precision
control during melting of the metal.
statements of Test Methods E353 shall be used as a guide.
4.3 For most accurate estimate of ferrite percent, a quanti-
tative metallographic method should be used.
7.1.3.1 Methods E38 or Test Methods E353, as applicable,
shall be used as referee chemical analysis methods.
5. Ordering Information
7.2 Estimation in weld deposits by chemical composition in
accordance with the Schaeffler or DeLong diagrams:
5.1 Orders for material to this practice should include the
following as required: 7.2.1 The ferrite content shall be estimated (a) from the
deposit chemical analysis included on the electrode manufac-
5.1.1 ApplicableASTMproductspecificationorotherdocu-
ment covering product requirements, turer’s certified material test report, or (b) from chemical
analysis of a weld deposit pad made by the casting manufac-
5.1.2 Alloy grade,
turer.
5.1.3 Required ferrite content range, in volume percent, of
the castings after final heat treatment. Also, if desired by the
7.3 Estimation of ferrite content in heat, product, or weld
purchaser, required ferrite content range, in ferrite number, for metal may be made by the magnetic response or metallo-
weld deposits (Note 1) as deposited, and
graphic methods by imposition of Supplementary Require-
5.1.4 Supplementary requirements, if any, desired. ments S1 or S2, respectively.
A800/A800M–01 (2006)
8. Acceptance Standards in accordance with the specification (including year date) and
was found to meet the requirements.
8.1 Conformance with the required ferrite content range
specified in 5.1.3 as indicated by the estimation procedure of 9.2 The test report shall contain the results of the actual
7.1 and 7.2 shall be the basis for acceptance of material
chemicalanalysesrequiredby7.1.1and7.2.1andtheindicated
supplied under this practice unless other methods of estimation
ferrite content range. The estimates of ferrite content from
are ordered as supplementary requirements, in which case the
magnetic measurements (S1) or from point counts (S2), or
supplementary requirement shall be the basis of acceptance.
both, if ordered by the purchaser, also shall be reported.
8.2 If lack of conformance with the ferrite content range
9.3 The test report shall be signed by an authorized agent of
specifiedin5.1.3isindicatedbyaproductanalysismadebythe
the manufacturer.
purchaser (7.1.3) and by a referee analysis as provided in
9.4 The test report shall be furnished within five working
7.1.3.1, rejection of material shall be subject to the tests of 7.3
days of shipment of the castings.
as established by written agreement between the manufacturer
and the purchaser.
10. Keywords
9. Certification
10.1 austenite; austenitic stainless steel; ferrite; Schoefer
9.1 The manufacturer’s certification shall be furnished to
Diagram; steel castings
the purchaser stating that the material was sampled and tested
SUPPLEMENTARY REQUIREMENTS
The following supplementary requirements are for use when desired by the purchaser. They shall
not apply unless specified in the order, in which event the specified methods of ferrite content
estimation shall be employed by the manufacturer before shipment of the castings.
S1. Estimation of Ferrite Content by Measurement of S1.2.1.2 When further specified, measurements shall be
Magnetic Response made on repair or fabrication welds on castings in locations as
agreed in writing between the purchaser and manufacturer.
S1.1 The ferrite content of the heat from which the castings
S1.3 Number of Measurements—Six measurements shall be
are poured shall be estimated from measurements made by
made at random in each designated location. For instruments
primary or secondary instruments calibrated in accordance
having probes making two contacts with the surface being
with the requirements of Practice A799/A799M. All measure-
measured, a “measurement” shall consist of a pair of readings
ments shall be made on material after the solution heat
taken with the probe oriented on perpendicular axes.
treatment required by the applicable product specification, or,
S1.4 Surface Condition:
if any subsequent solution heat treatment is employed, then
after the final solution heat treatment.
S1.4.1 Theinstrumentmagnetorprobeandthesurfacetobe
measured shall be dry and cleaned prior to testing to remove
S1.1.1 Location of measurements—base metal:
any scale, grease, lint, or dirt that could affect the accuracy of
S1.1.1.1 Measurements shall be made on the unstrained
measurement.
ends of tension test specimens from the same heat as the
castingsrepresented.Measurementsmaybemadeeitherbefore S1.4.2 Measurements shall be made more than 0.25 in.
[6.350 mm] from the edge of a surface. When measurements
or after performance of the tension test. If a tension test is not
are made on a curved surface the radius of curvature must be
required by the applicable product specification, measurements
may be made on a specimen cut from a keel block of a design greater than 0.375 in. [9.525 mm].
in Fig. 3 of Test Methods and Definitions A370.
S1.5 Acceptance Criteria:
S1.1.1.2 When further specified, measurements shall be
S1.5.1 The average of the ferrite contents estimated from
made on the base metal of the castings, or a specified sample
measurements in each designated location shall be within the
of castings (not on weld repairs or other weld deposits), in
limits stated in the order, and not more than two individual
locations designated on the design drawing or as otherwise
measurements shall indicate ferrite contents less than or in
agreed in wr
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: A 800/A 800M – 01 (Reapproved 2006)
Standard Practice for
Steel Casting, Austenitic Alloy, Estimating Ferrite Content
Thereof
This standard is issued under the fixed designationA 800/A 800M; the number immediately following the designation indicates the year
of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval.
A superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope
1.1 This practice covers procedures and definitions for estimating ferrite content in certain grades of austenitic iron-chromium-
nickel alloy castings that have compositions balanced to create the formation of ferrite as a second phase in amounts controlled
to be within specified limits. Methods are described for estimating ferrite content by chemical, magnetic, and metallographic
means.
1.2 The grades covered by this practice are: CF-3, CF-3A, CF-8, CF-8A, CF-3M, CF-3MA, CF-8M, CF-8C, CG-8M, and
CH-10.
1.3 Thevaluesstatedineitherinch-poundunitsorSIunitsaretoberegardedseparatelyasstandard.Withinthetext,theSIunits
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 practice.
1.4 This standard does not purport to address the safety concerns, if any, associated with its use. It is the responsibility of the
user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations
prior to use.
2. Referenced Documents
2.1 ASTM Standards:
A 351/A 351M Specification for Castings, Austenitic, for Pressure-Containing Parts
A 370 Test Methods and Definitions for Mechanical Testing of Steel Products
A 799/A 799M Practice for Steel Castings, Stainless, Instrument Calibration, for Estimating Ferrite Content
A 941 Terminology Relating to Steel, Stainless Steel, Related Alloys, and Ferroalloys
E 38 Methods for Chemical Analysis of Nickel-Chromium and Nickel-Chromium-Iron Alloys
E 353 Test Methods for Chemical Analysis of Stainless, Heat-Resisting, Maraging, and Other Similar Chromium-Nickel-Iron
Alloys
E 562 Test Method for Determining Volume Fraction by Systematic Manual Point Count
2.2 Constitution Diagrams:
Schoefer Diagram for Estimating Ferrite Content of Stainless Steel Castings (1980 revision)
Schaeffler Diagram for Estimating Ferrite Content of Stainless Steel Weld Metal
DeLong Diagram for Estimating Ferrite Content of Stainless Steel Weld Metal
2.3 American Welding Society Specification:
AWSA4.2, Procedures for Calibrating Magnetic Instruments to Measure the Delta Ferrite Content ofAustenitic Stainless Steel
Weld Metal
3. Terminology
3.1 Definitions:
3.1.1 ferrite—the ferromagnetic, body-centered, cubic-microstructural constituent of variable chemical composition in
iron-chromium-nickel alloys. This may be formed upon solidification from the molten metal (delta ferrite) or by transformation
This practice is under the jurisdiction of ASTM Committee A01 on Steel, Stainless Steel, and Related Alloys and is the direct responsibility of Subcommittee A01.18
on Castings.
Current edition approved March 1, 2006. Published April 2006. Originally approved in 1982. Last previous edition approved in 2001 as A 800/A 800M – 01.
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Appendix of this practice.
Metal Progress Data Book, American Society for Metals, Mid June 1977, p. 161.
Welding Journal, American Welding Society, Vol 38, No. 7, July 1973, p. 293–s.
Available from American Welding Society (AWS), 550 NW LeJeune Rd., Miami, FL 33126.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
A 800/A 800M – 01 (2006)
from austenite or sigma phase on cooling in the solid state (alpha ferrite).
3.1.2 ferrite content—the proportion of total volume of an iron-chromium-nickel alloy present as the ferrite phase.
3.1.3 ferrite number—theferritecontentexpressedasanarbitrarynumberbasedonthemagneticresponseofthealloyinaweld
deposit.
3.1.4 ferrite percentage—the ferrite content expressed as a volume percent.
3.1.5 heat treatment—the definitions in Terminology A 941 are applicable to this practice.
4. Significance and Use
4.1 The tensile and impact properties, the weldability, and the corrosion resistance of iron-chromium-nickel alloy castings may
be influenced beneficially or detrimentally by the ratio of the amount of ferrite to the amount of austenite in the microstructure.
The ferrite content may be limited by purchase order requirements or by the design construction codes governing the equipment
in which the castings will be used. The quantity of ferrite in the structure is fundamentally a function of the chemical composition
ofthealloyanditsthermalhistory.Becauseofsegregation,thechemicalcomposition,and,therefore,theferritecontent,maydiffer
from point to point on a casting. Determination of the ferrite content by any of the procedures described in the following practice
is subject to varying degrees of imprecision which must be recognized in setting realistic limits on the range of ferrite content
specified. Sources of error include the following:
4.1.1 In Determinations from Chemical Composition—Deviations from the actual quantity of each element present in an alloy
because of chemical analysis variance, although possibly minor in each case, can result in substantial difference in the ratio of total
ferrite-promoting to total austenite-promoting elements. Therefore, the precision of the ferrite content estimated from chemical
composition depends on the accuracy of the chemical analysis procedure.
4.1.2 In Determinations from Magnetic Response—Phases other than ferrite and austenite may be formed at certain
temperatures and persist at room temperature. These may so alter the magnetic response of the alloy that the indicated ferrite
content is quite different from that of the same chemical composition that has undergone different thermal treatment.Also, because
the magnets or probes of the various measuring instruments are small, different degrees of surface roughness or surface curvature
will vary the magnetic linkage with the material being measured.
4.1.3 In Determinations from Metallographic Examination —Metallographic point count estimates of ferrite percentage may
vary with the etching technique used for identification of the ferrite phase and with the number of grid points chosen for the
examination, as explained in Test Method E 562.
4.2 Theestimationofferritepercentbychemicalcompositionoffersthemostusefulandmostcommonmethodofferritecontrol
during melting of the metal.
4.3 For most accurate estimate of ferrite percent, a quantitative metallographic method should be used.
5. Ordering Information
5.1 Orders for material to this practice should include the following as required:
5.1.1 Applicable ASTM product specification or other document covering product requirements,
5.1.2 Alloy grade,
5.1.3 Required ferrite content range, in volume percent, of the castings after final heat treatment. Also, if desired by the
purchaser, required ferrite content range, in ferrite number, for weld deposits (Note 1) as deposited, and
5.1.4 Supplementary requirements, if any, desired.
NOTE 1—There may be a substantial decrease in the ferrite content of weld deposits after solution heat treatment in comparison with the as-deposited
value.
6. General Caution
6.1 In specifying ferrite content as required in 5.1.3, the purchaser should not set limits that conflict with applicable material
specification requirements: for example, a maximum limit of 10 % ferrite for Grade CF-3A in Specification A 351/A 351M for
which the minimum tensile strength requirement is 77 ksi [530 MPa].
6.2 When Supplementary Requirement S1 is specified, the purchaser should set ferrite content limits that are compatible with
the measuring instrument to be used.
7. Estimation of Ferrite Content
7.1 EstimationinthebasemetalofthecastingbychemicalcompositioninaccordancewiththeSchoeferdiagram(seeAppendix
X1):
7.1.1 A chemical analysis of the heat from which the castings are poured shall include the following elements whether or not
required by the chemical requirements of the product specification: carbon, manganese, silicon, chromium, nickel, molybdenum,
columbium, and nitrogen.
7.1.1.1 Upon written agreement between the purchaser and the producer, an estimated nitrogen content may be reported instead
of an amount determined by analysis of the specific heat if actual chemical analyses have been made for nitrogen in a sufficient
number of heats of the same alloy type, produced by the same melting practice, to establish the average nitrogen content to be
expected.
A 800/A 800M – 01 (2006)
7.1.2 The ferrite content of the casting shall be estimated from the central line of the diagram at the composition ratio of
“chromium equivalent” (Cr ) to “nickel equivalent” (Ni ) determined from the following formula:
e e
~Cr~%! 1 1.5Si~%! 1 1.4Mo~%! 1 Cb~%! 2 4.99!/~Ni~%!
130C~%! 1 0.5Mn~%! 1 26~N 2 0.02%! 1 2.77!
5 ~Cr !/~Ni !
e e
7.1.3 When a product analysis is made by the purchaser, it shall include the elements listed in 7.1.1. If a comparison is made
of ferrite content estimated from a product analysis performed by the purchaser, with that estimated from the heat analysis (see
7.1.1), the reproducibility data in the precision statements of Test Methods E 353 shall be used as a guide.
7.1.3.1 Methods E 38 or Test Methods E 353, as applicable, shall be used as referee chemical analysis methods.
7.2 Estimation in weld deposits by chemical composition in accordance with the Schaeffler or DeLong diagrams:
7.2.1 The ferrite content shall be estimated ( a) from the deposit chemical analysis included on the electrode manufacturer’s
certified material test report, or (b) from chemical analysis of a weld deposit pad made by the casting manufacturer.
7.3 Estimation of ferrite content in heat, product, or weld metal may be made by the magnetic response or metallographic
methods by imposition of Supplementary Requirements S1 or S2, respectively.
8. Acceptance Standards
8.1 Conformance with the required ferrite content range specified in 5.1.3 as indicated by the estimation procedure of 7.1 and
7.2 shall be the basis for acceptance of material supplied under this practice unless other methods of estimation are ordered as
supplementary requirements, in which case the supplementary requirement shall be the basis of acceptance.
8.2 If lack of conformance with the ferrite content range specified in 5.1.3 is indicated by a product analysis made by the
purchaser (7.1.3) and by a referee analysis as provided in 7.1.3.1, rejection of material shall be subject to the tests of 7.3 as
established by written agreement between the manufacturer and the purchaser.
9. Certification
9.1 The manufacturer’s certification shall be furnished to the purchaser stating that the material was sampled and tested in
accordance with the specification (including year date) and was found to meet the requirements.
9.2 The test report shall contain the results of the actual chemical analyses required by 7.1.1 and 7.2.1 and the indicated ferrite
content range. The estimates of ferrite content from magnetic measurements (S1) or from point counts (S2), or both, if ordered
by the purchaser, also shall be reported.
9.3 The test report shall be signed by an authorized agent of the manufacturer.
9.4 The test report shall be furnished within five working days of shipment of the castings.
10. Keywords
10.1 austenite; austenitic stainless steel; ferrite; Schoefer Diagram; steel castings
SUPPLEMENTARY REQUIREMENTS
The following supplementary requirements are for use when desired by the purchaser. They shall
not apply unless specified in the order, in which event the specified methods of ferrite content
estimation shall be employed by the manufacturer before shipment of the castings.
S1. Estimation of Ferrite Content by Measurement of Magnetic Response
S1.1 The ferrite content of the heat from which the castings are poured shall be estimated from measurements made by primary
or secondary instruments calibrated in accordance with the requirements of Practice A 799/A 799M. All measurements shall be
made on material after the solution heat treatment required by the applicable product specification, or, if any subsequent solution
heat treatment is employed, then after the final solution heat treatment.
S1.1.1 Location of measurements—base metal:
S1.1.1.1 Measurements shall be made on the unstrained ends of tension test specimens from the same heat as the castings
represented. Measurements may be made either before or after performance of the tension test. If a tension test is not required by
the applicable product specification, measurements may be made on a specimen cut from a keel block of a design in Fig. 3 of Test
Methods and Definitions A 370.
S1.1.1.2 Whenfurtherspecified,measurementsshallbemadeonthebasemetalofthecastings,oraspecifiedsampleofcastings
( not on weld repairs or other weld deposits), in locations designated on the design drawing or as otherwise agreed in writing
between the purchaser and the manufacturer.
S1.2 The ferrite content of weld deposits shall be estimated from measurements made by primary or secondary instruments
calibrated in accordance with the requirements of Specification AWS A4.2. All measurements shall be made on weld deposits as
deposited.
S1.2.1 Location of measurements—weld deposits:
A 800/A 800M – 01 (2006)
S1.2.1.1 Measurements shall be made on a weld pad deposited in accordance with the electrode specification.
S1.2.1.2 When further specified, measurements shall be made on repair or fabrication welds on castings in locations as agreed
in writing between the purchaser and manufacturer.
S1.3 Number of Measurements—Six measurements shall be made at random in each designated location. For instruments
having probes making two contacts with the surface being measured, a “measurement” shall consist of a pair of readings taken
with the probe oriente
...
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