ASTM A872/A872M-07a(2012)
(Specification)Standard Specification for Centrifugally Cast Ferritic/Austenitic Stainless Steel Pipe for Corrosive Environments
Standard Specification for Centrifugally Cast Ferritic/Austenitic Stainless Steel Pipe for Corrosive Environments
ABSTRACT
This specification covers centrifugally cast ferritic/austenitic steel pipe intended for general corrosive service. These steels are susceptible to embrittlement if used for prolonged periods at elevated temperatures. The pipe shall be made by centrifugal casting process and furnished in the specified heat-treatment condition. The pipe shall also be machined. The grades shall conform to the required chemical composition for carbon, manganese, phosphorus, sulfur, silicon, nickel, chromium, molybdenum, nitrogen, copper, and cobalt. Heat analysis and product analysis shall be done. Tensile requirements shall conform to the specified tensile strength, yield strength, and elongation; and hardness requirements shall conform to the specified Brinell and Rockwell C values. Tension test shall also be made.
SCOPE
1.1 This specification covers centrifugally cast ferritic/austenitic steel pipe intended for general corrosive service. These steels are susceptible to embrittlement if used for prolonged periods at elevated temperatures.
1.2 Optional supplementary requirements are provided when additional testing may be required.
1.3 The values stated in either inch-pound units or SI units are to be regarded separately as standard. Within the text, SI units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system must be used independently of each other. Combining values from the two systems may result in nonconformance with the specification.
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Standards Content (Sample)
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Designation:A872/A872M −07a(Reapproved 2012)
Standard Specification for
Centrifugally Cast Ferritic/Austenitic Stainless Steel Pipe for
Corrosive Environments
This standard is issued under the fixed designationA872/A872M; 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* in. (114 to 305-mm)) Steel Castings
E340 Test Method for Macroetching Metals and Alloys
1.1 This specification covers centrifugally cast ferritic/
E446 Reference Radiographs for Steel Castings Up to 2 in.
austenitic steel pipe intended for general corrosive service.
(50.8 mm) in Thickness
These steels are susceptible to embrittlement if used for
2.2 ASME Boiler and Pressure Vessel Code:
prolonged periods at elevated temperatures.
Section IX Welding Qualifications
1.2 Optional supplementary requirements are provided
2.3 ASTM Adjuncts:
when additional testing may be required.
Adjunct E186 Reference Radiographs—Transparencies in
1.3 The values stated in either inch-pound units or SI units Ringbinders, 3 Volumes
Adjunct E280 Reference Radiographs—Transparencies in
are to be regarded separately as standard. Within the text, SI
units are shown in brackets. The values stated in each system Ringbinders, 2 Volumes
Adjunct E446 Reference Radiographs—Transparencies in
are not exact equivalents; therefore, each system must be used
independently of each other. Combining values from the two Ringbinders, 3 Volumes
systems may result in nonconformance with the specification.
3. Ordering Information
2. Referenced Documents
3.1 Orders for material to this specification shall include the
following, as required, to describe the desired material ad-
2.1 ASTM Standards:
equately.
A370 Test Methods and Definitions for Mechanical Testing
3.1.1 Quantity (feet [metres] or number of lengths),
of Steel Products
3.1.2 Name of material (centrifugally cast ferritic/austenitic
A488/A488M Practice for Steel Castings, Welding, Qualifi-
steel pipe),
cations of Procedures and Personnel
3.1.3 Grade (Table 1),
A781/A781M Specification for Castings, Steel and Alloy,
3.1.4 Size (outside or inside diameter and minimum wall
Common Requirements, for General Industrial Use
thickness in inches [millimetres]),
A999/A999M Specification for General Requirements for
3.1.5 Length (specific or random, Specification A999/
Alloy and Stainless Steel Pipe
A999M),
E29 Practice for Using Significant Digits in Test Data to
3.1.6 End finish of Specification A999/A999M,
Determine Conformance with Specifications
3.1.7 Optional Requirements (S1 through S6),
E94 Guide for Radiographic Examination
3.1.8 Test report required (Section 12), and
E165 Practice for Liquid Penetrant Examination for General
3.1.9 Special requirements or additions to the specification.
Industry
E186 Reference Radiographs for Heavy-Walled (2 to 4 ⁄2-in.
4. General Requirements
(50.8 to 114-mm)) Steel Castings
4.1 Material furnished under this specification shall con-
E280 Reference Radiographs for Heavy-Walled (4 ⁄2 to 12-
form to the applicable requirements of the current edition of
Specification A999/A999M, unless otherwise provided herein.
This specification is under the jurisdiction ofASTM Committee A01 on Steel,
Stainless Steel and Related Alloysand is the direct responsibility of Subcommittee
A01.18 on Castings. Available from American Society of Mechanical Engineers (ASME
Current edition approved March 1, 2012. Published April 2012. Originally International), Three Park Ave., New York, NY 10016-5990.
approved in 1977. Last previous edition approved in 2007 as A872/A872M – 07a. Available from ASTM International Headquarters. Request ADJE018601 for
DOI: 10.1520/A0872_A0872M-07AR12. Vol I, ADJE018602 for Vol II, and ADJE018603 for Vol III.
2 5
For referenced ASTM standards, visit the ASTM website, www.astm.org, or Available from ASTM International Headquarters. Request for ADJE028001
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Vol I and ADJE028002 for Vol II.
Standards volume information, refer to the standard’s Document Summary page on Available from ASTM International Headquarters. Request for ADJE044601
the ASTM website. Vol I, ADJE044602 for Vol II, and ADJE044603 for Vol III.
*A Summary of Changes section appears at the end of this standard
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A872/A872M−07a (2012)
TABLE 1 Chemical Requirements
Grade
Element
UNS J94300
UNS J93183 UNS J93550
CD4MCuMN
C 0.030 max 0.030 max 0.04
Mn 2.0 max 2.0 max 0.50–1.50
P 0.040 max 0.040 max 0.04
S 0.030 max 0.030 max 0.04
Si 2.0 max 2.0 max 1.10 max
Ni 4.00–6.00 5.00–8.00 4.5–6.0
Cr 20.0–23.0 23.0–26.0 24.5–26.5
Mo 2.00–4.00 2.00–4.00 2.5–4.0
N 0.08–0.25 0.08–0.25 0.18–0.26
Cu 1.00 max 1.00 max 1.3–3.0
Co 0.50–1.50 0.50–1.50 .
5. Materials and Manufacture 7.2.1 Test bars shall be taken from heat-treated castings.
7.2.2 Tension test specimens shall be machined to the form
5.1 Manufacture:
and dimensions shown in Figs. 5 or 6 of Test Methods and
5.1.1 The pipe shall be made by the centrifugal casting
Definitions A370.
process.
5.1.2 All pipes shall be furnished in the heat-treated condi-
7.3 Number of Tests:
tion as shown in Table 2.
7.3.1 One tension test shall be made from each heat.
5.1.3 Machining—The pipe shall be machined on the inner
7.3.2 If a specimen is machined improperly or flaws are
surface and may be supplied either machined or unmachined in
revealed by machining or during testing, the specimen may be
the outer surface. All machining shall be to a roughness value
discarded and another substituted from the same heat.
agreed upon between the manufacturer and purchaser.
7.4 Retests—Iftheresultsofthemechanicaltestforanyheat
do not conform to the requirements specified, the casting may
6. Chemical Composition
be reheat treated and retested, but this may not be solution
6.1 Heat Analysis—An analysis of each heat shall be made
treated more than twice.
by the manufacturer to determine the percentages of elements
specified in Table 1. The analysis shall be made on a test
8. Quality
sample taken preferably during the pouring of the heat. The
8.1 The surface of the casting shall be examined visually
chemical composition thus determined shall conform to the
and shall be free of cracks and hot tears. Other surface defects
requirements specified in Table 1.
shall be judged in accordance with visual acceptance criteria
6.2 Product Analysis—A product analysis may be made by
that may be specified in the order.
thepurchaser.Thesampleforanalysisshallbeselectedsoasto
be thoroughly representative of the pipe being analyzed. The
9. Rework and Retreatment
chemical composition thus determined shall conform to the
requirements specified in Table 1. 9.1 Defects as defined in Section 9 shall be removed and
their removal verified by visual inspection of the resultant
6.3 To determine conformance with the chemical analysis
cavities. Defects that are located by inspection using Supple-
requirements, an observed value or calculated value shall be
mentary Requirement S4, S5, or S6 shall be removed or
rounded in accordance with Practice E29 to the nearest unit in
reduced to an acceptable size.
the last right-hand place of values listed in Table 1.
9.2 If removal of the defect does not infringe upon the
7. Tensile Requirements
minimum wall thickness, the depression shall be blended
uniformly into the surrounding surface.
7.1 Testing—Steel used for the castings shall conform to the
tensile and hard
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