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ASTM A743M-2003 一般用途铁铬、铁铬镍耐腐蚀铸件

Designation: A 743/A 743M – 03

Standard Speci?cation for

Castings, Iron-Chromium, Iron-Chromium-Nickel, Corrosion Resistant, for General Application1
This standard is issued under the ?xed designation A 743/A 743M; 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. This standard has been approved for use by agencies of the Department of Defense.

1. Scope * 1.1 This speci?cation covers iron-chromium and ironchromium-nickel alloy castings for general corrosion-resistant application. The grades covered by this speci?cation represent types of alloy castings suitable for broad ranges of application which are intended for a wide variety of corrosion environments.
NOTE 1—For alloy castings for severe corrosion-resistant service, reference should be made to Speci?cation A 744/A 744M. For general heat-resistant alloy castings, reference should be made to Speci?cation A 297/A 297M. For nickel alloy castings for corrosion-resistant service, reference should be made to Speci?cation A 494/A 494M.

A 447/A447M Speci?cation for Steel Castings, ChromiumNickel-Iron Alloy (25-12 Class), for High-Temperature Service3 A 494/A494M Speci?cation for Castings, Nickel and Nickel Alloy3 A 744/A744M Speci?cation for Castings, Iron-ChromiumNickel, Corrosion Resistant, for Severe Service3 A 781/A781M Speci?cation for Castings, Steel and Alloy, Common Requirements, for General Industrial Use3 3. General Conditions for Delivery 3.1 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 on 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. 4. Ordering Information 4.1 Orders for material to this speci?cation should include the following, as required, to describe the material adequately: 4.1.1 Description of the casting by pattern number or drawing, 4.1.2 Grade, 4.1.3 Heat treatment, 4.1.4 Options in the speci?cation, and 4.1.5 Supplementary requirements desired, including the standards of acceptance. 5. Process 5.1 The steel shall be made by the electric furnace process with or without separate re?ning such as argon-oxygen decarburization (AOD). 6. Heat Treatment 6.1 Castings shall be heat treated in accordance with the requirements in Table 1.

1.2 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 speci?cation. Inch-pound units are applicable for material ordered to Speci?cation A 743 and SI units for material ordered to Speci?cation A 743M. 2. Referenced Documents 2.1 ASTM Standards: A 262 Practices for Detecting Susceptibility to Intergranular Attack in Austenitic Stainless Steels2 A 297/A297M Speci?cation for Steel Castings, IronChromium and Iron-Chromium-Nickel, Heat-Resistant, for General Application3 A 370 Test Methods and De?nitions for Mechanical Testing of Steel Products2
1 This speci?cation 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 May 10, 2003. Published May 2003. Originally approved in 1977. Last previous edition approved in 1998 as A 743/A 743M – 98a. 2 Annual Book of ASTM Standards, Vol 01.03. 3 Annual Book of ASTM Standards, Vol 01.02.

*A Summary of Changes section appears at the end of this standard.
Copyright ? ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.

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A 743/A 743M – 03
TABLE 1 Heat Treatment Requirements
Grade CF8, CG3M, CG8M, CG12, CF20, CF8M, CF8C,CF16F, CF16Fa CH10, CH20, CE30, CK20 CA15, CA15M, CA40, CA40F CB30, CC50 CF3, CF3M, CF3MN CN3M CN3MN CN7M, CG6MMN CN7MS CA6NM CA6N CF10SMnN CA28MWV CK3MCuN CK35MN CB6 Heat Treatment Heat to 1900°F [1040°C] minimum, hold for sufficient time to heat casting to temperature, quench in water or rapid cool by other means. Heat to 2000°F [1093°C] minimum, hold for sufficient time to heat casting to temperature, quench in water or rapid cool by other means. (1) Heat to 1750°F [955°C] minimum, air cool and temper at 1100°F [595°C] minimum, or (2) Anneal at 1450°F [790°C] minimum. (1) Heat to 1450°F [790°C] minimum, and air cool, or (2) Heat to 1450°F [790°C] minimum, and furnace cool. (1) Heat to 1900°F [1040°C] minimum, hold for sufficient time to heat casting to temperature, and cool rapidly. (2) As cast if corrosion resistance is acceptable. Heat to 2150°F [1175°C] minimum, hold for sufficient time to heat casting to temperature, quench in water or rapid cool by other means. Heat to 2100°F [1150°C] minimum, hold for sufficient time to heat casting 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 to temperature, quench in water or rapid cool by other means. Heat to 2100°F [1150°C] minimum, 2150°F [1180°C] maximum, hold for sufficient time (2 h minimum) to heat casting to temperature and quench in water. Heat to 1850°F [1010°C] minimum, air cool to 200°F [95°C] or lower prior to any optional intermediate temper and prior to the ?nal temper. The ?nal temper shall be between 1050°F [565°C] and 1150°F [620°C]. Heat to 1900°F [1040°C], air cool, reheat to 1500°F [815°C], air cool, and age at 800°F [425°C], holding at each temperature sufficient time to heat casting uniformly to temperature. Heat to 1950°F [1065°C] minimum, hold for sufficient time to heat casting to temperature, quench in water or rapid cool by other means. (1) Heat to 1875–1925°F [1025–1050°C], quench in air or oil, and temper at 1150°F [620°C] minimum, or (2) Anneal at 1400°F [760°C] minimum. Heat to 2100°F [1150°C] minimum, hold for sufficient time to heat casting to temperature, quench in water or rapid cool by other means. Heat to 2100-2190F [1150-1200C], hold for sufficient time to heat casting to temperature, quench in water or rapid cool by other means. Heat between 1800°F [980°C] and 1920°F [1050°C], forced air, cool to 120°F [50°C] maximum, and temper between 1100°F and 1160°F [595°C and 625°C].

TABLE 2 Chemical Requirements

NOTE—CD4MCu has been deleted from A 743/A 743M and added to A 890/A 890M. CD4MCu may now be supplied and purchased in compliance with A 890/A 890M. The chemical and mechanical property requirements of CD4MCu were identical in A 743/A 743M and A 890/A 890M at the time of removal from A 743/A 743M.
Composition, % Grade (UNS) CF8 (J92600) CG12 (J93001) CF20 (J92602) CF8M (J92900) Type ManCarbon, Silicon, Phospho- Sulfur, ganese, max max rus, max max max 0.08 1.50 2.00 0.04 0.04 Chromium 18.0–21.0 Nickel 8.0– 11.0 10.0– 13.0 8.0– 11.0 9.0– 12.0 0.08 1.50 2.00 0.04 0.04 18.0–21.0 9.0– 12.0 0.16 1.50 2.00 0.17 0.04 18.0–21.0 9.0– 12.0 0.16 1.50 2.00 0.04 0.20– 0.40 0.04 18.0–21.0 9.0– 0.40–0.80 12.0 12.0– 15.0 ... ... 1.50 max ... 0.20– 0.35 ... ... ... ... ... ... ... ... ... ...
A

Molybde- Columnum bium ... ...

SeleCopper nium ... ...

Tungsten, max ...

Vanadium, Nitrogen max ... ...

19 Chromium, 9 Nickel 22 Chromium, 12 Nickel 19 Chromium, 9 Nickel 19 Chromium, 10 Nickel, with Molybdenum 19 Chromium, 10 Nickel, with Columbium 19 Chromium, 9 Nickel, Free Machining 19 Chromium, 9 Nickel, Free Machining 25 Chromium, 12 Nickel

0.12

1.50

2.00

0.04

0.04

20.0–23.0

...

...

...

...

...

...

...

0.20

1.50

2.00

0.04

0.04

18.0–21.0

...

...

...

...

...

...

...

0.08

1.50

2.00

0.04

0.04

18.0–21.0

2.0–3.0

...

...

...

...

...

...

CF8C (J92710)

...

...

...

...

...

CF16F (J92701)

CF16Fa

CH10 (J93401)

0.10

1.50

2.00

0.04

22.0–26.0

...

...

...

...

...

...

2

A 743/A 743M – 03
TABLE 2 Continued
Composition, % Grade (UNS) CH20 (J93402) CK20 (J94202) CE30 (J93423) CA15 (J91150) CA15M (J91151) CB30 (J91803) CC50 (J92615) CA40 (J91153) CA40F (J91154) CF3 (J92500) CF10SMnN (J92972) CF3M (J92800) Type ManCarbon, Silicon, Phospho- Sulfur, ganese, max max rus, max max max 0.20 1.50 2.00 0.04 0.04 Chromium 22.0–26.0 Nickel 12.0– 15.0 19.0– 22.0 8.0– Molybde- Columnum bium ... ... SeleCopper nium ... ... Tungsten, max ... Vanadium, Nitrogen max ... ...

25 Chromium, 12 Nickel 25 Chromium, 20 Nickel 29 Chromium, 9 Nickel 12 Chromium

0.20

2.00

2.00

0.04

0.04

23.0–27.0

...

...

...

...

...

...

...

0.30

1.50

2.00

0.04

0.04

26.0–30.0

...

...

...

...

...

...

...

0.15

1.00

1.50

0.04

0.04

11.5–14.0

11.0 1.00 0.50 max max 1.0 max 2.00 max 4.00 max 1.0 max 1.0 max 8.0– 12.0 8.0– 9.0 9.0– 13.0

...

...

...

...

...

...

12 Chromium

0.15

1.00

0.65

0.040

0.040

11.5–14.0

0.15–1.0

...

...

...

...

...

...

20 Chromium

0.30

1.00

1.50

0.04

0.04

18.0–21.0

...

...

...

B

...

...

...

28 Chromium

0.50

1.00

1.50

0.04

0.04

26.0–30.0

...

...

...

...

...

...

...

12 Chromium

0.20– 0.40 0.20– 0.40 0.03

1.00

1.50

0.04

0.04

11.5–14.0

0.5 max

...

...

...

...

...

...

12 Chromium, Free Machining 19 Chromium, 9 Nickel 17 Chromium, 8.5 Nickel with Nitrogen 19 Chromium, 10 Nickel, with Molybdenum 19 Chromium, 10 Nickel, with Molybdenum, and Nitrogen

1.00

1.50

0.04

0.20– 0.40 0.04

11.5–14.0

0.5 max

...

...

...

...

...

...

1.50

2.00

0.04

17.0–21.0

...

...

...

...

...

...

...

0.10

7.00– 9.00 1.50

3.50– 4.50 1.50

0.060

0.030

16.0–18.0

...

...

...

...

...

...

0.08– 0.18 ...

0.03

0.04

0.04

17.0–21.0

2.0–3.0

...

...

...

...

...

CF3MN (J92804)

0.03

1.50

1.50

0.040

0.040

17.0–22.0

9.0– 13.0

2.0–3.0

...

...

...

...

...

0.10– 0.20

CG6MMN (J93790) CG3M (J92999) CG8M (J93000)

0.06 19 Chromium, 11 Nickel, with Molybdenum 19 Chromium, 11 Nickel, with Molybdenum 0.03

4.00– 6.00 1.50

1.00 1.50

0.04 0.04

0.03 0.04

20.5–23.5 18.0–21.0

11.5– 1.50–3.00 0.10– 13.5 0.30 9.0– 3.0–4.0 ... 13.0 9.0– 13.0 3.0–4.0 ...

... ...

... ...

... ...

0.10– 0.30 ...

0.20– 0.40 ...

0.08

1.50

1.50

0.04

0.04

18.0–21.0

...

...

...

...

...

CN3M (J94652) CN3MN (J94651)

0.03 21 Chromium, 24 Nickel with Molybdenum and Nitrogen 20 Chromium, 29 Nickel, with Copper and Molybdenum 19 Chromium, 24 Nickel, with Copper and Molybdenum 12 Chromium, 4 Nickel 11 Chromium, 7 Nickel 0.03

2.0 2.00

1.0 1.00

0.03 0.040

0.03 0.010

20.0–22.0 20.0–22.0

23.0– 27.0 23.5– 25.5

4.5–5.5 6.0–7.0

... ...

... ...

... 0.75 max

... ...

... ...

... 0.18– 0.26

CN7M (N08007)

0.07

1.50

1.50

0.04

0.04

19.0–22.0

27.5– 30.5

2.0–3.0

...

...

3.0– 4.0

...

...

...

CN7MS (J94650)

0.07

1.00

2.50– 3.50

0.04

0.03

18.0–20.0

22.0– 25.0

2.5–3.0

...

...

1.5– 2.0

...

CA6NM (J91540) CA6N

0.06

1.00

1.00

0.04

0.03

11.5–14.0

3.5– 4.5 6.0– 8.0

0.40–1.0

...

...

...

...

...

...

0.06

0.50

1.00

0.02

0.02

10.5–12.5

...

...

...

...

...

...

...

3

A 743/A 743M – 03
TABLE 2 Continued
Composition, % Grade (UNS) Type ManCarbon, Silicon, Phospho- Sulfur, ganese, max max rus, max max max 0.20– 0.28 0.50– 1.00 1.0 0.030 0.030 Chromium 11.0–12.5 Nickel Molybde- Columnum bium ... SeleCopper nium ... ... Tungsten, max Vanadium, Nitrogen max ...

CA28MWV 12 Chromium, with (J91422) Molybdenum, Tungsten and Vanadium CK3MCuN 20 Chromium (J93254) 18 Nickel, with Copper and Molybdenum CK35MN 23 Chromium, 21 Nickel, with Molybdenum and Nitrogen CB6 16 Chromium, (J91804) 4 Nickel

0.50– 0.90–1.25 1.00

0.90– 0.20– 1.25 0.30

0.025

1.20

1.00

0.045

0.010

19.5–20.5

17.5– 19.5

6.0–7.0

...

...

0.50– 1.00

...

...

0.180– 0.240

0.035

2.00

1.00

0.035

0.020

22.0-24.0

20.022.0

6.0-6.8

...

...

0.40

...

...

0.21-0.32

0.06

1.00

1.00

0.04

0.03

15.5–17.5 3.5–5.5

0.5 max

...

...

...

...

...

...

A Grade CF8C shall have a columbium content of not less than eight times the carbon content and not more than 1.0%. If a columbium-plus-tantalum alloy in the approximate Cb:Ta ratio of 3:1 is used for stabilizing this grade, the total columbium-plus-tantalum content shall not be less than nine times the carbon content and shall not exceed 1.1%. B For Grade CB30 a copper content of 0.90 to 1.20% is optional.

NOTE 2—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 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.

7. Chemical Requirements 7.1 The chemical requirements are shown in Table 2. 8. Repair by Welding 8.1 Repair welding of Grade CA28MWV is not permitted unless by agreement between the manufacturer and the purchaser. 8.2 When methods involving high temperature are used in the removal of discontinuities, castings shall be preheated in accordance with Table 3. Weld repairs shall be subject to the same quality standards as are used to inspect the castings. 8.3 Post weld heat treatment, if required, shall be in accordance with Table 1. 8.3.1 The martensitic grades CA6NM, CA15, CA15M, CB6, and CA40 shall be retempered after weld repairing, except that local tempering will be permitted if, in the opinion
TABLE 3 Minimum Preheat Temperatures
Grade Minimum Preheat Temperatures °F CA15, CA15M CA40, CA28MWV Others 400 50 °C [205] [10]

of the manufacturer, furnace heat treating will be damaging to the ?nished surface of a machined casting. Heat treatment, other than tempering, of grades CA6NM, CA15, CA15M, CB6, and CA40 after weld repairing shall be performed only when agreed upon between the manufacturer and the purchaser. Weld repair on Grade CA40F is not recommended because of the risk of local hardening and possible cracking in the heat affected zone. 8.3.2 Post weld heat treatment is not required on the other grades of this speci?cation. When post weld heat treatment is believed necessary for adequate corrosion resistance in the service environment, castings should be ordered in accordance with Speci?cation A 744/A 744M. 9. Product Marking 9.1 Castings shall be marked for material identi?cation with the ASTM speci?cation number (A 743/A 743M) and grade symbol, that is, CF8, CA15, CB30, etc. In addition, the manufacturer’s name or identi?cation mark and the pattern number shall be cast or stamped using the 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 corrosion resistant; iron-chromium; iron-chromiumnickel; steel castings

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A 743/A 743M – 03
SUPPLEMENTARY REQUIREMENTS 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 which are ordinarily considered suitable for use with this speci?cation are given below. Others enumerated in A781/A 781M may be used with this speci?cation upon agreement between the manufacturer and purchaser. S1. Magnetic Particle Examination S2. Radiographic Examination S3. Liquid Penetrant Examination S4. Ultrasonic Examination S5. Examination of Weld Preparation S6. Certi?cation S7. Prior Approval of Major Weld Repairs S11. Intergranular Corrosion Test S11.1 An intergranular corrosion test shall be performed in accordance with the appropriate practice for the particular grade involved, as listed in Practices A 262, or as agreed upon with the purchaser. Intergranular corrosion tests on stabilized or 0.03 % carbon maximum grades (CF3, CF3M, CF8C, and CG3M) shall be made on sensitized specimens. On all other grades of chromium-nickel steels, intergranular corrosion tests shall be made on specimens representative of the as-shipped condition. S12 Tension Test S12.1 Tensile properties shall be determined from material representing each heat. The bar from which the test specimen is taken shall be heat treated in production furnaces to the same procedure as the castings it represents. The results shall conform to the requirements speci?ed in Table S12.1. S12.2 Test bars shall be poured in separately cast keel blocks similar to Fig. 1 or Fig. 2 or Fig. 3 of A 781. S12.3 Tension test specimens may be cut from heat-treated castings, or from as-cast castings if no heat treatment is speci?ed for the castings, instead of from test bars, when agreed upon between the manufacturer and the purchaser. S12.4 Test specimens shall be machined to the form and dimensions of the standard round 2-in. [50-mm] gage length specimen shown in Fig. 4 and 5 of Test Methods and De?nitions A 370, and shall be tested in accordance with Test Methods and De?nitions A 370. S12.5 If the results of the mechanical tests for any heat, lot, or casting do not conform to the requirements speci?ed, retests are permitted as outlined in Test Methods and De?nitions A 370. At the manufacturer’s option, castings may be reheattreated and retested. When castings are reheat-treated, they may not be reaustenitized more than three times without the approval of the purchaser. Testing after reheat treatment shall consist of the full number of specimens taken from locations complying with the speci?cation or order. S12.6 If any test specimen shows defective machining or develops ?aws, it may be discarded and another specimen substituted from the same heat. S13. Post Weld-Heat Treatment S13.1 Weld repairs shall be considered major in the case of a casting which has leaked on hydrostatic test 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. S13.2 Grades CF8, CG3M, CG8M, CG12, CF20, CF8M, CF8C, CF16F, CF16Fa, CH10, CH20, CE30, CK20, CF3, CF3M, CF3MN, CN7M, CN7MS, CN3MN, CB30, CC50, CA6N, and CK3MCuN shall be heat treated after major weld repairs, but it is not required after minor repairs except by agreement between the manufacturer and the purchaser. S14. Hardness Tests S14.1 Brinell tests on non-austenitic grades shall be conducted. Grades CA15, CA15M, CB30, and CC50 shall have a Brinell hardness of 241 HB maximum. Grade CA6NM shall have a Brinell hardness of 285 HB maximum, Grade CA40 and CA40F, 269 HB maximum, and Grade CA28MWV, 302–352 HB, except for the annealed condition, when the Brinell hardness of this grade shall not exceed 269 HB. S14.2 The location where the Brinell hardness reading is to be taken and the frequency of such Brinell hardness inspection of the castings shall be established by agreement between the manufacturer and the purchaser. S15. Low Ferrite in CF8 S15.1 When low ferrite or non-magnetic properties are required, the mechanical property requirements and volume fraction of ferrite as determined by S 31, A 890/A 890M, shall be by agreement between the manufacturer and the purchaser.

5

A 743/A 743M – 03
TABLE S12.1 Tensile Requirements
Tensile Strength, min Grade CF8 CG12 CF20 CF8M CF8C CF16F and CF16Fa CH20 and CH10 CK20 CE30 CA15 and CA15M CB30 CC50 CA40 CA40F CF3 CF10SMnN CF3M CF3MN CG6MMN CG3M CG8M CN3M CN3MN CN7M CN7MS CA6NM CA6N CA28MWVC CK3MCuN CK35MN CB6
A B C

Yield Strength, min ksi 30B 28 30 30 30 30 30 28 40 65 30 ... 70 70 30 42 30 37 42 35 35 25 38 25 30 80 135 110 38 41 85 [MPa] [205]B [195] [205] [205] [205] [205] [205] [195] [275] [450] [205] ... [485] [485] [205] [290] [205] [255] [290] [240] [240] [170] [260] [170] [205] [550] [930] [760] [260] [280] [580]

Type ksi 19 22 19 19 19 19 Chromium, Chromium, Chromium, Chromium, Chromium, Chromium, 9 Nickel 12 Nickel 9 Nickel 10 Nickel, with Molybdenum 10 Nickel with Columbium 9 Nickel, Free Machining 70B 70 70 70 70 70 70 65 80 90 65 55 100 100 70 85 70 75 85 75 75 63 80 62 70 110 140 140 80 83 115 [MPa] [485]B [485] [485] [485] [485] [485] [485] [450] [550] [620] [450] [380] [690] [690] [485] [585] [485] [515] [585] [515] [520] [435] [550] [425] [485] [755] [965] [965] [550] [570] [790]

Elongation in 2 in. [50 mm], min, %A 35 35 30 30 30 25 30 30 10 18 ... ... 15 12 35 30 30 35 30 25 25 30 35 35 35 15 15 10 35 35 16

Reduction of Area, min, % ... ... ... ... ... ... ... ... ... 30 ... ... 25 ... ... ... ... ... ... ... ... ... ... ... ... 35 50 24 ... ... 35

25 Chromium, 12 Nickel 25 Chromium, 20 Nickel 29 Chromium, 9 Nickel 12 Chromium 20 Chromium 28 Chromium 12 Chromium 12 Chromium, Free Machining 19 Chromium, 9 Nickel 17 Chromium, 8.5 Nickel with Nitrogen, 9 Nickel 19 Chromium, 10 Nickel, with Molybdenum 19 Chromium, 10 Nickel, with Molybdenum, and Nitrogen Chromium-Nickel-Manganese-Molybdenum 19 Chromium, 11 Nickel, with Molybdenum 19 Chromium, 11 Nickel, with Molybdenum 21 Chromium, 24 Nickel, with Molybdenum, and Nitrogen 20 Chromium, 29 Nickel, with Copper and Molybdenum 19 Chromium, 24 Nickel, with Copper and Molybdenum 12 Chromium, 4 Nickel 11 Chromium, 7 Nickel 12 Chromium, with Molybdenum, Tungsten, and Vanadium 20 Chromium 18 Nickel, with Copper and Molybdenum 23 Chromium, 21 Nickel, with Molybdenum and Nitrogen 16 Chromium, 4 Nickel

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. For low ferrite or nonmagnetic castings of this grade, the following values shall apply: tensile strength, min, 65 ksi [450 MPa]; yield point, min, 28 ksi [195 MPa]. These mechanical properties apply only when heat-treatment (1) has been used.

SUMMARY OF CHANGES Committee A01 has identi?ed the location of selected changes to this standard since the last issue (A 743/A 743M – 98a) that may impact the use of this standard. (1) UNS numbers were added to Table 2 and removed elsewhere. (2) Hyphens were deleted from alloy designations.

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