ASTM A743 - A 743M - 21

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Designation: A743/A743M −21

Standard Speciﬁcation for

Castings, Iron-Chromium, Iron-Chromium-Nickel, Corrosion

Resistant, for General Application

This standard is issued under the ﬁxed designation A743/A743M; 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.

This standard has been approved for use by agencies of the U.S. Department of Defense.

1. Scope*

1.1 This speciﬁcation covers iron-chromium and iron-

chromium-nickel alloy castings for general corrosion-resistant

application. The grades covered by this speciﬁcation represent

types of alloy castings suitable for broad ranges of application

which are intended for a wide variety of corrosion environ-

ments.

NOTE 1—For alloy castings for severe corrosion-resistant service,

reference should be made to Speciﬁcation A744/A744M. For general

heat-resistant alloy castings, reference should be made to Speciﬁcation

A297/A297M. For nickel alloy castings for corrosion-resistant service,

reference should be made to Speciﬁcation A494/A494M.

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 speciﬁ-

cation. Inch-pound units are applicable for material ordered to

Speciﬁcation A743 and SI units for material ordered to

Speciﬁcation A743M.

1.3 This international standard was developed in accor-

dance with internationally recognized principles on standard-

ization established in the Decision on Principles for the

Development of International Standards, Guides and Recom-

mendations issued by the World Trade Organization Technical

Barriers to Trade (TBT) Committee.

2. Referenced Documents

2.1 ASTM Standards:

A262 Practices for Detecting Susceptibility to Intergranular

Attack in Austenitic Stainless Steels

A297/A297M Speciﬁcation for Steel Castings, Iron-

Chromium and Iron-Chromium-Nickel, Heat Resistant,

for General Application

A494/A494M Speciﬁcation for Castings, Nickel and Nickel

Alloy

A744/A744M Speciﬁcation for Castings, Iron-Chromium-

Nickel, Corrosion Resistant, for Severe Service

A781/A781M Speciﬁcation for Castings, Steel and Alloy,

Common Requirements, for General Industrial Use

A890/A890M Speciﬁcation for Castings, Iron-Chromium-

Nickel-Molybdenum Corrosion-Resistant, Duplex

(Austenitic/Ferritic) for General Application

A957/A957M Speciﬁcation for Investment Castings, Steel

and Alloy, Common Requirements, for General Industrial

Use

3. General Conditions for Delivery

3.1 Except for investment castings, castings furnished to

this speciﬁcation shall conform to the requirements of Speci-

ﬁcation A781/A781M, including any supplementary require-

ments that are indicated on the purchase order. Failure to

comply with the general requirements of Speciﬁcation A781/

A781M constitutes nonconformance with this speciﬁcation. In

case of conﬂict between the requirements of this speciﬁcation

and Speciﬁcation A781/A781M, this speciﬁcation shall pre-

vail.

3.2 Steel investment castings furnished to this speciﬁcation

shall conform to the requirements of Speciﬁcation A957/

A957M, including any supplementary requirements that are

indicated in the purchase order. Failure to comply with the

general requirements of Speciﬁcation A957/A957M consti-

tutes nonconformance with this speciﬁcation. In case of con-

ﬂict between the requirements of this speciﬁcation and Speci-

ﬁcation A957/A957M, Speciﬁcation A957/A957M shall

prevail.

4. Ordering Information

4.1 Orders for material to this speciﬁcation should include

the following, as required, to describe the material adequately:

This speciﬁcation 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, 2021. Published March 2021. Originally

approved in 1977. Last previous edition approved in 2019 as A743/A743M – 19.

DOI: 10.1520/A0743_A0743M-21.

For referenced ASTM standards, visit the ASTM website, www.astm.org, or

contact ASTM 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.

*A Summary of Changes section appears at the end of this standard

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the

Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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 speciﬁcation,

4.1.5 Whether castings are to be produced using the invest-

ment casting process, and

4.1.6 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 reﬁning such as argon-oxygen decar-

burization (AOD).

6. Heat Treatment

6.1 Castings shall be heat treated in accordance with the

requirements in Table 1.

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 speciﬁed; 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 pur-

chaser.

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 accor-

dance 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

of the manufacturer, furnace heat treating will be damaging to

the ﬁnished 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 pur-

chaser. 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 speciﬁcation. When post-weld heat treatment is

believed necessary for adequate corrosion resistance in the

service environment, castings should be ordered in accordance

with Speciﬁcation A744/A744M.

8.3.3 For Grade HG10MNN, the ﬁller metal to be used shall

be established by mutual agreement between the manufacturer

and the purchaser.

9. Product Marking

9.1 Castings shall be marked for material identiﬁcation with

the ASTM speciﬁcation number (A743/A743M) and grade

symbol, that is, CF8, CA15, CB30, etc. In addition, the

manufacturer’s name or identiﬁcation mark and the pattern

number shall be cast or stamped using low-stress stamps on all

TABLE 1 Heat Treatment Requirements

Grade Heat Treatment

CA6N 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.

CA6NM 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 ﬁnal temper. The ﬁnal temper shall be between 1050 °F [565 °C] and 1150 °F [620 °C].

CA15, CA15M, CA40, CA40F (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.

CA28MWV (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.

CB30, CC50 (1) Heat to 1450 °F [790 °C] minimum, and air cool, or

(2) Heat to 1450 °F [790 °C] minimum, and furnace cool.

CB6 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].

CE30, CH10, CH20, CK20 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.

CF3, CF3M, CF3MN (1) 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.

(2) As cast if corrosion resistance is acceptable.

CF8, CF8C, CF8M, CF16F, CF16Fa,

CF20, CG3M, CG8M, CG12

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.

CF10SMnN 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.

CK3MCuN, CK35MN, CN3M, CN3MN Heat to 2200 °F [1200 °C] minimum, hold for 4 h minimum, quench in water or rapid cool by other means.

CG6MMN, CN7M 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.

CN7MS 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.

HG10MNN As cast

A743/A743M − 21

TABLE 2 Chemical Requirements

A,B

Material Grade

Type

(UNS)

Element, %

Carbon Manganese Phosphorus Sulfur Silicon Chromium Nickel Molybdenum Nitrogen Copper Niobium

Other

CA6N

11Cr-7Ni

0.06 0.50 0.02 0.02 1.00 10.5–12.5 6.0–8.0 . . . . . . . . . . . . . . .

CA6NM

12Cr-4Ni

(J91540)

0.06 1.00 0.04 0.03 1.00 11.5–14.0 3.5–4.5 0.40–1.0 . . . . . . . . . . . .

CA15

12 Cr

(J91150)

0.15 1.00 0.04 0.04 1.50 11.5–14.0 1.00 0.50 . . . . . . . . . . . .

CA15M

12 Cr

(J91151)

0.15 1.00 0.040 0.040 0.65 11.5–14.0 1.0 0.15–1.0 . . . . . . . . . . . .

CA28MWV

12Cr-Mo-W-V

(J91422)

0.20–0.28 0.50–1.00 0.030 0.030 1.0 11.0–12.5 0.50–1.00 0.90–1.25 . . . . . . . . . V:

0.20–0.30

0.90–1.25

CA40

12 Cr

(J91153)

0.20–0.40 1.00 0.04 0.04 1.50 11.5–14.0 1.0 0.5 . . . . . . . . . . . .

CA40F

12 Cr

(J91154)

0.20–0.40 1.00 0.04 0.20–0.40 1.50 11.5–14.0 1.0 0.5 . . . . . . . . . . . .

CB6

16Cr-4Ni

(J91804)

0.06 1.00 0.04 0.03 1.00 15.5–17.5 3.5–5.5 0.5 . . . . . . . . . . . .

CB30

20 Cr

(J91803)

0.30 1.00 0.04 0.04 1.50 18.0–21.0 2.00 . . . . . .

... ...

CC50

28 Cr

(J92615)

0.50 1.00 0.04 0.04 1.50 26.0–30.0 4.00 . . . . . . . . . . . . . . .

CE30

29Cr-9Ni

(J93423)

0.30 1.50 0.04 0.04 2.00 26.0–30.0 8.0–11.0 . . . . . . . . . . . . . . .

CF3

19Cr-9Ni

(J92500)

0.03 1.50 0.04 0.04 2.00 17.0–21.0 8.0–12.0 . . . . . . . . . . . . . . .

CF3M

19Cr-10Ni-Mo

(J92800)

0.03 1.50 0.04 0.04 1.50 17.0–21.0 9.0–13.0 2.0–3.0 . . . . . . . . . . . .

CF3MN

19Cr-10Ni-Mo-N

(J92804)

0.03 1.50 0.040 0.040 1.50 17.0–22.0 9.0–13.0 2.0–3.0 0.10–0.20 . . . . . . . . .

CF8

19Cr-9Ni

(J92600)

0.08 1.50 0.04 0.04 2.00 18.0–21.0 8.0–11.0 . . . . . . . . . . . . . . .

CF8C

19Cr-10Ni-Nb

(J92710)

0.08 1.50 0.04 0.04 2.00 18.0–21.0 9.0–12.0 . . . . . . . . .

...

CF8M

19Cr-10Ni-Mo

(J92900)

0.08 1.50 0.04 0.04 2.00 18.0–21.0 9.0–12.0 2.0–3.0 . . . . . . . . . . . .

CF10SMnN

17Cr-8.4Ni-N

(J92972)

0.10 7.00–9.00 0.060 0.030 3.50–4.50 16.0–18.0 8.0–9.0 . . . 0.08–0.18 . . . . . . . . .

A743/A743M − 21

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摘要：

ASTM A743 - A 743M - 21 是由美国材料与试验协会发布的最新版本标准规范，涵盖适用于一般用途的耐腐蚀不锈钢铸件。该标准明确了铁素体、马氏体、奥氏体及双相不锈钢铸件的化学成分、机械性能、热处理要求和验收检验方法，广泛应用于化工、石油、船舶、食品加工及核电等对耐腐蚀性能要求严格的设备制造领域。通过遵循 ASTM A743/A743M-21 规范，工程师和采购方能够确保铸件在严苛环境下的可靠性、可焊性与长期使用寿命。该标准适用于砂型铸造、离心铸造及精密铸造等多种工艺，是国际工程采购

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