ASTM B720 - 93

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Designation: B 720 – 93 An American National Standard

Standard Speciﬁcation for

Seamless UNS N08310 Tube

This standard is issued under the ﬁxed designation B 720; 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 speciﬁcation covers seamless cold-worked tubes of

UNS Alloy N08310 for use in condenser and heat-exchanger

service.

1.2 This speciﬁcation covers outside-diameter and nominal-

wall or outside-diameter and minimum-wall tube.

1.2.1 The sizes covered by this speciﬁcation are 3 in. (75

mm) and under in outside diameter with minimum wall

thickness of 0.250 in. (6.4 mm) and under, and with nominal

wall thickness of 0.278 in. (7 mm) and under.

1.3 Tube shall be furnished in the annealed condition.

1.4 The values stated in inch-pound units are to be regarded

as the standard. The values stated in parentheses are for

information only.

1.5 The following safety hazards caveat pertains only to the

test method portion, Section 11, of this speciﬁcation. This

standard does not purport to address all of the safety problems,

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 limita-

tions prior to use.

2. Referenced Documents

2.1 ASTM Standards:

E 8 Test Methods for Tension Testing of Metallic Materials

E 29 Practice for Using Signiﬁcant Digits in Test Data to

Determine Conformance with Speciﬁcations

E 38 Methods for Chemical Analysis of Nickel-Chromium

and Nickel-Chromium-Iron Alloys

E 354 Test Methods for Chemical Analysis of High-

Temperature, Electrical, Magnetic, and Other Similar Iron,

Nickel, and Cobalt Alloys

3. Ordering Information

3.1 Orders for material to this speciﬁcation shall include

information with respect to the following:

3.1.1 ASTM designation and year of issue,

3.1.2 Finish.

3.1.3 Dimensions—Outside diameter, minimum or nominal

wall thickness (in inches or millimetres, not gage number), and

length.

3.1.3.1 Whether minimum or nominal-wall tubing is to be

furnished.

3.1.4 Fabrication Operations:

3.1.4.1 Cold bending or coiling.

3.1.4.2 Packing.

3.1.4.3 Rolling or expanding into tube sheets.

3.1.4.4 Welding or Brazing—Process to be employed.

3.1.4.5 Pressure Requirements, if other than required by 4.3.

3.1.4.6 Ends—Plain ends cut and deburred will be fur-

nished.

3.1.5 Certiﬁcation—State if certiﬁcation is required (Sec-

tion 15).

3.1.6 Samples for Product (Check) Analysis, whether

samples for product (check) analysis shall be furnished.

3.1.7 Purchaser Inspection—If purchaser wishes to witness

tests or inspection of material at place of manufacture, the

purchase order must so state indicating which tests or inspec-

tions are to be witnessed (Section 13).

4. Mechanical and Other Requirements

4.1 Mechanical Properties—The material shall conform to

the mechanical properties speciﬁed in Table 1.

4.2 Flare—A ﬂare test shall be made on one end of each

random length tube after ﬁnal heat treatment.

4.2.1 The ﬂare test shall consist of ﬂaring a test specimen

with an expanding tool having an included angle of 60° until

the speciﬁed outside diameter has been increased by 30 %. The

ﬂared specimen shall not exhibit cracking through the wall.

4.3 Hydrostatic Test:

4.3.1 Each tube with an outside diameter

⁄

in. and larger

and tubes with wall thickness of 0.015 in. (0.38 mm) and over

shall be tested by the manufacturer to an internal hydrostatic

pressure of 1000 psi (7 MPa) provided that the ﬁber stress

calculated in accordance with the following equation does not

exceed the allowable ﬁber stress, S, indicated below. The tube

shall show no evidence of leakage.

P52St/D(1)

This speciﬁcation is under the jurisdiction of ASTM Committee B-2 on

Nonferrous Metals and Alloys and is the direct responsibility of Subcommittee

B02.07 on Reﬁned Nickel and Cobalt, and Alloys Containing Nickel or Cobalt or

Both as Principal Constituents.

Current edition approved Feb. 15, 1993. Published April 1993. Originally

published as B 720 – 83. Last previous edition B 720 – 88.

Annual Book of ASTM Standards, Vol 03.01.

Annual Book of ASTM Standards, Vol 14.02.

Discontinued—see 1989 Annual Book of ASTM Standards, Vol 03.05.

Annual Book of ASTM Standards, Vol 03.05.

AMERICAN SOCIETY FOR TESTING AND MATERIALS

100 Barr Harbor Dr., West Conshohocken, PA 19428

Reprinted from the Annual Book of ASTM Standards. Copyright ASTM

NOTICE: This standard has either been superseded and replaced by a new version or discontinued.

Contact ASTM International (www.astm.org) for the latest information.

where:

P5hydrostatic test pressure, psi (MPa),

S5allowable ﬁber stress for material in the condition

furnished, as follows:

psi MPa

26 300 180

t5minimum wall thickness, in. (mm); equal to the

speciﬁed nominal wall minus the permissible minus

wall tolerance, Table 2, or the speciﬁed minimum wall

thickness, and

D5outside diameter of the tubes, in. (mm).

4.3.2 When so agreed upon between the manufacturer and

the purchaser, tube may be tested to 1

⁄

times the allowable

ﬁber stress.

5. Dimensions and Permissible Variations

5.1 Outside Diameter and Wall Thickness—The permissible

variations in the outside diameter and wall thickness of tube

shall not exceed those prescribed in Table 2.

5.2 Length—When tube is ordered cut to length, the length

tolerance shall be − 0, +

⁄

in. for lengths #30 ft (9 m)

and−0,+

⁄

in. (6 mm) for length >30 ft (9 m).

5.3 Straightness—Material shall be reasonably straight and

free of bends or kinds.

6. Workmanship, Finish, and Appearance

6.1 The material shall be uniform in quality and temper,

smooth, commercially straight, and free of injurious

imperfections.

7. Chemical Requirements

7.1 The material shall conform to the composition limits

speciﬁed in Table 3.

7.2 If a product (check) analysis is performed by the

purchaser, the material shall conform to the product (check)

analysis variations in Table 4.

8. Sampling

8.1 Lot Deﬁnitions:

8.1.1 A lot of chemical analysis shall consist of one heat.

8.1.2 A lot for mechanical properties shall consist of all

material from the same heat, nominal size (excepting length),

and condition (temper).

8.1.2.1 Where material cannot be identiﬁed by heat, a lot

shall consist of not more than 500 lb (230 kg) of material in the

same condition (temper) and size.

8.2 Test Material Selection:

8.2.1 Chemical Analysis—Representative samples shall be

taken during pouring or subsequent processing.

8.2.1.1 Product (check) analysis shall be wholly the

responsibility of the purchaser.

8.2.2 Mechanical Properties—Samples of the materials to

provide test specimens for mechanical properties shall be taken

from such locations in each lot as to be representative of that

lot.

9. Number of Test

9.1 Chemical Analysis—One test per lot.

9.2 Mechanical Properties—One test per lot.

9.3 Flare—One ﬂaring test shall be made on specimens

from each end of one ﬁnished tube from each lot.

10. Specimen Preparation

10.1 Tension Test:

10.1.1 Tension-test specimens shall be taken from material

in the ﬁnal condition (temper) and test in the direction of

fabrication.

10.1.2 Whenever possible, all tube shall be tested in full

tubular size. When testing in full tubular size is not possible,

longitudinal strip specimens, or the largest possible round

specimen, shall be used. In the event of disagreement when full

tubular testing is not possible, a longitudinal strip specimen

with reduced gage length as contained in Methods E 8 shall be

used.

11. Test Methods

11.1 The chemical composition, mechanical, and other

properties of the material as enumerated in this speciﬁcation

shall be determined, in case of disagreement, in accordance

with the following methods.

Test ASTM Designation

Chemical analysis Methods E 38 and E 354

Tension Methods E 8

Rounding procedure Practice E 29

11.2 For purposes of determining compliance with the

speciﬁed limits for requirements of the properties listed in the

following table, an observed value or a calculated value shall

be rounded as indicated below, in accordance with the

rounding method of Practice E 29.

TABLE 1 Mechanical Properties of Tubes

Tensile strength,

min ksi (MPa)

Yield Strength

(0.2 % off-set), min ksi

(MPa)

Elongation in 2

in. or 50 mm

min (%)

105 (725) 50 (345) 30

TABLE 2 Permissible Variations in Outside Diameter and Wall Thickness of Condenser and Heat-Exchanger Tubes

Material Outside Diameter

in. (mm)

Permissible Variation

Outside Diameter, in. (mm) Wall Thickness (%)

Plus Minus Nominal Wall Minimal Wall

Plus Minus Plus Minus

⁄

, excl (13 to 16) 0.005 (0.13) 0.005 (0.13) 12.5 12.5 25.0 0

⁄

to 1

⁄

, incl (16 to 38) 0.0075 (0.19) 0.0075 (0.19) 10.0 10.0 20.0 0

⁄

to 3, incl (38 to 75) 0.010 (0.25) 0.010 (0.25) 10.0 10.0 22.0 0

B 720

Test Rounded Unit for Observed

or Calculated Value

Chemical composition and tolerance

(when expressed in decimals) nearest unit in the last right-hand place

of ﬁgures of the speciﬁed limit

Tension strength, yield strength nearest 1000 psi (5 MPa)

Elongation nearest 1 %

12. Inspection

12.1 Inspection of the material shall be made as agreed upon

between the manufacturer and the purchaser as part of the

purchase contract.

13. Rejection and Rehearing

13.1 Material that fails to conform to the requirements of

the speciﬁcation may be rejected. Rejection shall be reported to

the producer or supplier promptly and in writing. In case of

dissatisfaction with the results of this test, the producer or

supplier may make claim for a rehearing.

14. Certiﬁcation

14.1 When speciﬁed in the purchase order or contract, a

producer’s or supplier’s certiﬁcation shall be furnished to the

purchaser and that the material was manufactured, sampled,

tested, and inspected in accordance with this speciﬁcation and

has been found to meet the requirements. When speciﬁed in the

purchase order or contract, a report of the test results shall be

furnished.

15. Product Marking

15.1 Each bundle or shipping container shall be marked

with the name of the material; condition (temper); this

speciﬁcation number; the size; gross, tare, and net weight;

consignor and consignee addresses; contract or order number;

and such other information as may be deﬁned in the contract or

order.

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 ﬁve 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, 100 Barr Harbor Drive, West Conshohocken, PA 19428.

TABLE 3 Chemical Requirements

Composition (%)

Ni Cu Fe Mn C Si S Cr Al Ti Mo P V N

18.00

22.00

... balance

2.00

4.00

0.020,

max 0.050,

max 0.015,

max 24.00

26.00

... ... 2.00

4.00

0.035,

max 0.10

0.40

0.20

0.40

Shall be determined arithmetically by difference.

TABLE 4 Product (Check) Analysis Chemical-Composition

Variations

Element Speciﬁed Limit of

Element, %

Variation Under

Min or Over

Max of the Spec-

iﬁed Limit of

Element

Nickel Over 10.00 to 20.00, incl

Over 20.00 to 30.00, incl 0.15

0.25

Iron Over 30.00 to 50.00, incl

Over 50.00 to 60.00, incl 0.45

Manganese Over 1.00 to 3.00, incl

Over 3.00 to 6.00, incl 0.04

Carbon up to 0.02, incl 0.005

Silicon over 0.25 to 0.50, incl 0.03

Sulfur up to 0.02, incl 0.003

Chromium Over 15.00 to 30.00, incl 0.25

Molybdenum over 0.60 to 2.00, incl 0.05

over 2.00 to 7.00 incl 0.10

Phosphorus up to 0.040, incl 0.005

Vanadium up to 0.50, incl 0.03

Nitrogen Over 0.19 to 0.25, incl

Over 0.25 to 0.35, incl

Over 0.35 to 0.45, incl

0.02

0.03

0.04

B 720

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摘要：

ASTM B720 - 93 是美国材料与试验协会（ASTM）发布的一项关于钽及钽合金无缝管和焊接管的标准规范，适用于高温、耐腐蚀及化工等关键应用领域。该标准详细规定了钽合金管材的化学成分、力学性能、尺寸公差、制造工艺及测试方法，确保材料在极端环境下的可靠性和一致性。对于从事航空航天、半导体、医疗设备或化工行业的工程师、采购人员和质量管理团队而言，了解 ASTM B720 - 93 有助于正确选材、满足合规要求并提升产品安全性。该规范适用于管径范围广泛的无缝管和焊接管，并强调了材料的可加工性和焊

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