ASTM A890普通应用的铁铬镍钼耐蚀双重铸件

Designation: A 890/A 890M – 99

An American National Standard

Standard Speci?cation for Castings, Iron-Chromium-Nickel-Molybdenum CorrosionResistant, Duplex (Austenitic/Ferritic) for General Application1

This standard is issued under the ?xed designation A 890/A 890M; 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 speci?cation covers a group of cast duplex stainless steels (austenitic/ferritic).
1.2 The duplex stainless steel alloys offer a combination of enhanced mechanical properties and corrosion resistance when properly balanced in composition and properly heat treated. Ferrite levels are not speci?ed, but these alloys will develop a range of approximately 30 to 60 % ferrite with the balance austenite.
1.3 The values stated in either inch-pound units or metric (SI) units are to be regarded separately as standard. Within the text the metric (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 speci?cation.
2. Referenced Documents
2.1 ASTM Standards: A 370 Test Methods and De?nitions for Mechanical Testing
of Steel Products2 A 732/A732M Speci?cation for Castings, Investment, Car-
bon and Low-Alloy Steel for General Application, and Cobalt Alloy for High Strength at Elevated Temperatures3 A 781/A781M Speci?cation for Castings, Steel and Alloy, Common Requirements, for General Industrial Use3 E 29 Practice for Using Signi?cant Digits in Test Data to Determine Conformance With Speci?cations4 E 562 Practice for Determining Volume Fraction by Systematic Manual Point Count5 E 1245 Practice for Determining the Inclusion or SecondPhase Constituent Content of Metals by Automatic Image Analysis5
1 This speci?cation is under the jurisdiction of ASTM Committee A-1 on Steel, Stainless Steel, and Related Alloysand is the direct responsibility of Subcommittee A01.18 on Castings.
Current edition approved Dec. 10, 1999. Published January 2000. Originally published as A 890 – 88. Last previous edition A 890/A 890M – 98.
2 Annual Book of ASTM Standards, Vol 01.03. 3 Annual Book of ASTM Standards, Vol 01.02. 4 Annual Book of ASTM Standards, Vol 14.02. 5 Annual Book of ASTM Standards, Vol 03.01.

3. Ordering Information
3.1 Orders for material to this speci?cation shall include the following, as required, to describe the material adequately:
3.1.1 Description of casting by pattern or drawing number (dimensional tolerance shall be included on the casting drawing),
3.1.2 Speci?cation designation and grade including year of issue,
3.1.3 Options in the speci?cation (See 9.1), and 3.1.4 Supplementary requirements desired, including the standards of acceptance.
4. Process
4.1 The steel shall be made by the electric furnace process with or without separate re?ning such as argon-oxygendecarburization (AOD).
5. Heat Treatment
5.1 Castings shall be heat treated in accordance with the requirements in Table 1.
NOTE 1—Proper heat treatment of these alloys is usually necessary to enhance corrosion resistance and in some cases to meet mechanical properties. Minimum heat-treat temperatures are speci?ed; however, it is

TABLE 1 Heat Treatment Requirements

Grade 1A, 1B, 1C 2A 3A 4A
5A 6A

Heat Treatment
Heat to 1900°F [1040°C] minimum, hold for sufficient time to heat casting uniformly to temperature, quench in water or rapid cool by other means. Heat to 2050°F [1120°C] minimum, hold for sufficient time to heat casting uniformly to temperature, quench in water or rapid cool by other means. Heat to 1950°F [1070°C] minimum, hold for sufficient time to heat casting uniformly to temperature, quench in water or rapid cool by other means. Heat to 2050°F [1120°C] minimum for sufficient time to heat casting uniformly to temperature and water quench, or the casting may be furnace cooled to 1850°F [1010°C] minimum, hold for 15 min minimum and then water quench. A rapid cool by other means may be employed in lieu of water quench. Heat to 2050°F [1120°C] minimum, hold for sufficient time to heat casting to temperature, furnace cool to 1910°F [1045°C] minimum, quench in water or rapid cool by other means. Heat to 2010°F [1100°C] minimum, hold for sufficient time to heat casting uniformly to temperature, quench in water or cool rapidly by other means.

Copyright ? ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, United States.

A 890/A 890M

sometimes necessary to heat-treat at higher temperatures, hold for some minimum time at temperature and then rapidly cool the castings in order to enhance the corrosion resistance and meet mechanical properties.
6. Chemical Composition 6.1 The steel shall conform to the requirements as to
chemical composition prescribed in Table 2.

8.2 Weld repairs shall be subject to the same quality standards as are used to inspect the castings.
8.3 When post weld/heat treatment is believed necessary for adequate corrosion resistance or impact resistance, Supplementary Requirement S33 Post Weld/Heat Treatment shall be included in the purchase order.

7. General Requirements
7.1 Material furnished to this speci?cation shall conform to the requirements of Speci?cation A 781/A 781M, including any supplementary requirements that are indicated in the purchase order. Failure to comply with the general requirements of Speci?cation A 781/A 781M constitutes nonconformance with this speci?cation. In case of con?ict between the requirements of this speci?cation and Speci?cation A 781/ A 781M, this speci?cation shall prevail.
8. Repair by Welding
8.1 The composition of the deposited weld metal may be similar to that of the casting or may be suitably alloyed to achieve the desired corrosion resistance and mechanical properties.

9. Product Marking
9.1 Castings shall be marked for material identi?cation with the speci?cation designation and grade. In addition, the manufacturer’s name or identi?cation mark and the pattern number shall be cast or stamped using low-stress stamps on all castings. Small-size castings may be such that marking must be limited consistent with the available area. The marking of heat numbers on individual castings shall be agreed upon between the manufacturer and the purchaser. Marking shall be in such position as not to injure the usefulness of the casting.
10. Keywords
10.1 austenite; duplex stainless steel; ferrite; stainless steel; steel castings

TABLE 2 Chemical Requirements

Grade Type UNS ACI Composition: Carbon, max Manganese, max Silicon, max Phosphorus, max Sulfur, max Chromium Nickel Molybdenum Copper Tungsten Nitrogen

1A 25Cr-5Ni-Mo-Cu J93370 CD4MCu
0.04 1.00 1.00 0.040 0.040 24.5–26.5 4.75–6.00 1.75–2.25 2.75–3.25 ...

1B 25Cr-5Ni-M0-Cu-N J93372 CD4MCuN
0.04 1.0 1.0 0.04 0.04 24.5–26.5 4.7–6.0 1.7–2.3 2.7–3.3 ... 0.10–0.25

1CA 25Cr-6Ni-Mo-Cu-N J93373 CD3MCuN
0.030 1.20 1.10 0.030 0.030 24.0-26.7 5.6-6.7 2.9-3.8 1.40-1.90 ... 0.22-0.33

2A 24Cr-10Ni-Mo-N J93345 CE8MN
0.08 1.00 1.50 0.04 0.04 22.5–25.5 8.0–11.0 3.0–4.5 ... ... 0.10–0.30

Grade Type UNS ACI Composition: Carbon, max Manganese, max Silicon, max Phosphorus, max Sulfur, max Chromium Nickel Molybdenum Copper Tungsten Nitrogen
A % Cr + 3.3 % Mo + 16 % N $ 40.

3A 25Cr-5Ni-Mo-N J93371 CD6MN
0.06 1.00 1.00 0.040 0.040 24.0–27.0 4.0–6.0 1.75–2.5 ... ... 0.15–0.25

4A 22Cr-5Ni-Mo-N J92205 CD3MN
0.03 1.50 1.00 0.04 0.020 21.0–23.5 4.5–6.5 2.5–3.5 1.00, max ... 0.10–0.30

5AA 25Cr-7Ni-Mo-N J93404 CE3MN
0.03 1.50 1.00 0.04 0.04 24.0–26.0 6.0–8.0 4.0–5.0 ... ... 0.10–0.30

6AA 25Cr-7Ni-Mo-N J93380 CD3MWCuN
0.03 1.00 1.00 0.030 0.025 24.0–26.0 6.5–8.5 3.0–4.0 0.5–1.0 0.5–1.0 0.20–0.30

The following supplementary requirements shall not apply unless speci?ed in the purchase order. A list of standardized supplementary requirements for use at the option of the purchaser is included in Speci?cation A 781/A 781M. Those that are ordinarily considered suitable for use with this

A 890/A 890M
speci?cation are listed below by title only. Others enumerated in Speci?cation A 781/A 781M may be used with this speci?cation upon agreement between the manufacturer and purchaser.

S2. Radiographic Examination
S3. Liquid Penetrant Examination
S5. Examination of Weld Preparation
S6. Certi?cation
S7. Prior Approval of Major Weld Repairs
S9. Charpy Impact Test
S10. Hardness Test
S12. Test Report
S13. Unspeci?ed Elements
S31. Estimating Ferrite Content S31.1 Ferrite contents shall be determined by point count
(Practice E 562), by other quantitative metallographic methods such as image analysis (Practice E 1245), by measurement of magnetic response, or by other methods upon agreement between the manufacturer and the purchaser. Frequency of testing and location of tests shall be by agreement between the manufacturer and the purchaser.
S32. Tensile Requirements S32.1 One tensile test shall be made from each heat and
shall conform to the tensile requirements speci?ed in Table S32.1. Test bars shall be poured in special blocks from the same heat as the castings represented. (See S32.4.)
S32.2 The bar from which the test specimen is removed shall be heat-treated in production furnaces to the same procedure as the castings it represents.
S32.3 Test specimens may be cut from heat-treated castings, at the producer’s option, instead of from test bars.
S32.4 Test coupons may be cast integrally or as separate cast blocks in accordance with Figs. 1 and 2 of Speci?cation

A 781/A 781M. Tension coupons shall be machined to the form and dimensions of Fig. 4 of Test Methods and De?nitions A 370, except when investment castings are ordered. When investment castings are ordered, the manufacturer may prepare test specimens in accordance with S3.2 of Speci?cation A 732/ A 732M. Testing shall be in accordance with Test Methods and De?nitions A 370.
S32.5 If any specimen shows defective machining or develops ?aws, it may be discarded and another substituted from the same heat.
S32.6 To determine conformance with the tension test requirements, an observed value or calculated value shall be rounded off in accordance with Practice E 29 to the nearest 500 psi [5 MPa] for yield and tensile strength and to the nearest 1 % for elongation and reduction of area.
S33. Post Weld/Heat Treatment
S33.1 Castings shall be heat-treated after major weld repairs, but heat treatment after minor weld repairs is not required except upon agreement between the manufacturer and the purchaser.
S33.2 Weld repairs shall be considered major in the case of a casting that has leaked on hydrostatic testing or when the depth of the cavity after preparation for repair exceeds 20 % of the actual wall thickness, or 1 in. [25 mm], whichever is smaller, or when the extent of the cavity exceeds approximately 10 in.2[65 cm2]. All other weld repairs shall be considered minor.
S33.3 Post weld heat treatment shall be in accordance with Table 1.
S34. Prior Approval of Weld Material
S34.1 The purchaser must give approval of all weld ?ller materials to be used prior to any weld repairs.
S35. Heat Treatment of Test Material
S35.1 Test material for each heat shall be heat-treated with the castings it represents.

TABLE S32.1 Tensile Requirements

Grade Type Tensile strength, ksi [MPa], min Yield strength (0.2 % offset), ksi
[MPa], min Elongation in 2 in. [50 mm], %, minA

1A 25Cr-5Ni-Mo-Cu 100 [690] 70 [485]

2A 24Cr-10Ni-Mo-N 95 [655] 65 [450]

3A 25Cr-5Ni-Mo-N 95 [655] 65 [450]

4A 22Cr-5Ni-Mo-N 90 [620] 60 [415]

Grade Type
Tensile strength, ksi [MPa], min Yield strength (0.2 % offset), ksi
[MPa], min Elongation in 2 in. [50 mm], %, minA

5A 25Cr-7Ni-Mo-N
100 [690] 75 [515]

6A 25Cr-7Ni-Mo-N
100 [690] 65 [450]

1B 25Cr-5Ni-MoCu-N 100 [690] 70 [485]

1C 25Cr-6Ni-MoCu-N 100 [690] 65 [450]

A When ICI test bars are used in tensile testing as provided for in this speci?cation, the gage length to reduced section diameter ratio shall be 4:1.


A 890/A 890M
The American Society for Testing and Materials takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility.
This standard is subject to revision at any time by the responsible technical committee and must be reviewed every ?ve years and if not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM Headquarters. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards, at the address shown below.
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