ASTM A368 - 95a (2019)

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Designation: A368 −95a (Reapproved 2019)
Standard Speciﬁcation for
Stainless Steel Wire Strand
1
This standard is issued under the ﬁxed designation A368; 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
1.1 This speciﬁcation covers stainless steel wire strand
composed of a multiplicity of round wires and suitable for use
as guy wires, overhead ground wires, and similar purposes.
1.2 The values stated in inch-pound units are to be regarded
as standard. The values given in parentheses are mathematical
conversions to SI units that are provided for information only
and are not considered standard.
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:
2
A555/A555M Speciﬁcation for General Requirements for
Stainless Steel Wire and Wire Rods
A751 Test Methods, Practices, and Terminology for Chemi-
cal Analysis of Steel Products
3. Ordering Information
3.1 It is the responsibility of the purchaser to specify all
requirements that are necessary for material ordered under this
speciﬁcation. Such requirements may include, but are not
limited to, the following:
3.1.1 Quantity (length of strand or weight of quantity
ordered, or both; see 13.1 and Table 1),
3.1.2 Name of material (stainless steel),
3.1.3 Form (wire strand in coils or on reels),
3.1.4 Applicable dimensions (for nominal strand diameter,
see Table 1),
3.1.5 Number of wires per strand (Table 1),
3.1.6 Minimum breaking strength (medium or high
strength),
3.1.7 Type designation (see Section 7),
3.1.8 ASTM designation, and date of issue, and
3.1.9 Special requirements, if any.
NOTE 1—A typical ordering description is as follows: 1000 ft, stainless
steel 7-wire strand,
7
⁄
16
-in. diameter, medium strength, on reel, Type 302,
ASTM A368 dated _____.
4. General Requirements for Delivery
4.1 In addition to the requirements of this speciﬁcation, all
requirements of the current edition of Speciﬁcation A555/
A555M shall apply. Failure to comply with the general
requirements of Speciﬁcation A555/A555M constitutes non-
conformance with this speciﬁcation.
5. Stranding
5.1 Three-wire strand shall have a left lay with a uniform
pitch of not less than 10 nor more than 16 times the nominal
diameter of the strand. Seven-wire strand and the outer layer of
19-wire strand, shall have a left lay with a uniform pitch of not
less than 12 nor more than 16 times the nominal diameter of the
strand. A left lay is deﬁned as a counter-clockwise twist away
from the observer. All wires shall be stranded with uniform
tension. Stranding shall be sufficiently close to ensure no
appreciable reduction in diameter when stressed to 10 % of the
speciﬁed strength.
5.2 All wires in the strand shall lie naturally in their true
positions in the completed strand, and when the strand is cut,
the ends shall remain in position or be readily replaced by hand
and then remain in position. This may be accomplished by any
means or process, such as preforming, post forming, or form
setting.
6. Joints
6.1 There shall be no strand joints or strand splices in any
length of the completed strand.
6.2 In 3-wire strand, there shall be no joints in the individual
wires.
6.3 In 7-wire strand, joints in individual wires shall be
acceptable provided there is not more than one joint in any
150-ft (46-m) section of the completed strand and the location
1
This speciﬁcation is under the jurisdiction of ASTM Committee A01 on Steel,
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee
A01.17 on Flat-Rolled and Wrought Stainless Steel.
Current edition approved March 1, 2019. Published March 2019. Originally
approved in 1953. Last previous edition approved in 2013 as A368 – 95a (2013).
DOI: 10.1520/A0368-95AR19.
2
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.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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.
1
 

of each wire joint is marked on the strand with paint or some

other distinguishing mark.

6.4 In 19-wire strand, joints in the individual wires of the

outer layer of 12 wires shall be acceptable provided there is not

more than one joint in any 150-ft (46-m) section and the

location of each wire joint is marked on the strand with paint

or some other distinguishing mark. Joints in the 7-wire inner

layer of 19-wire strand shall be acceptable provided there is not

more than one joint in any 150-ft section.

6.5 Joints in the individual wires shall be ﬂash or upset

butt-welded. Care shall be taken to prevent injury to the wire

during welding.

7. Chemical Composition

7.1 The steel shall be Type 302, 304, 305, 316, 316Cb, or

316Ti and shall conform to the requirements as to chemical

composition speciﬁed in Table 2.

7.2 Methods and practices relating to chemical analysis

required by this speciﬁcation shall be in accordance with Test

Methods, Practices, and Terminology A751.

8. Mechanical Requirements

8.1 The tensile strength requirements, based upon the nomi-

nal strand diameter and the number of wires in each strand,

shall conform to the requirements speciﬁed in Table 1. All

tension tests shall be made upon lengths of strand that do not

contain welds in the individual wires.

8.2 The individual wires of the completed strand shall not

fracture when wrapped in a close helix of at least two turns

upon itself as a mandrel at a rate not exceeding 15 turns/min.

9. Dimensions, Mass, and Permissible Variations

9.1 The nominal diameter of the ﬁnished strand and of the

individual wires, the number of wires per strand, and the

approximate weight per 1000 ft (or per 304.80 m) of strand are

shown in Table 1.

9.2 The diameter of the individual wires forming the strand

shall not vary from the nominal wire diameters by more than

60.001 in. (60.025 mm).

10. Workmanship, Finish, and Appearance

10.1 The ﬁnished strand shall be tight, smooth, and free of

imperfections not consistent with good commercial practice.

10.2 The diameter of the ﬁnished strand shall be uniform,

except for a minor increase in diameter due to a wire joint.

11. Sampling

11.1 Sampling for determination of compliance to this

speciﬁcation shall be performed on each lot of completed

TABLE 1 Mechanical Properties of Stainless Steel Wire Strand

Nominal Diameter

of Strand,

in. (mm)

Number of Wires

in Strand

Nominal Diameter

of Stainless Wires, in. (mm)

Approximate Weight of

Strand per 1000 ft

(304.80 m), lb (kg)

Minimum Breaking Strength of Strand, lbf (kN)

Medium Strength High Strength

⁄

(5.16) 3 0.093 (2.36) 72 (32.66) 3 150 (14.01) 4 500 (20.02)

⁄

(5.56) 3 0.104 (2.64) 90 (40.82) 3 950 (17.57) 5 650 (25.13)

⁄

(6.35) 3 0.120 (3.05) 120 (54.43) 5 300 (23.58) 7 550 (33.58)

⁄

(7.94) 3 0.145 (3.68) 175 (79.38) 7 700 (34.25) 11 000 (48.93)

⁄

(9.52) 3 0.165 (4.19) 225 (102.06) 10 000 (44.48) 14 300 (63.61)

⁄

(5.56) 7 0.072 (1.83) 100 (45.36) 4 500 (20.02) 6 300 (28.02)

⁄

(6.35) 7 0.083 (2.11) 132 (59.87) 5 950 (26.47) 8 500 (37.81)

⁄

(7.14) 7 0.093 (2.36) 167 (75.75) 7 350 (32.69) 10 500 (46.71)

⁄

(7.94) 7 0.104 (2.64) 208 (94.35) 9 200 (40.92) 13 200 (58.72)

⁄

(9.52) 7 0.120 (3.05) 278 (126.10) 12 500 (55.60) 18 000 (80.07)

⁄

(11.11) 7 0.145 (3.68) 405 (183.71) 18 200 (80.96) 26 000 (115.65)

⁄

(12.70) 7 0.165 (4.19) 525 (238.14) 23 600 (104.98) 33 700 (149.90)

⁄

(9.52) 19 0.075 (1.90) 295 (133.81) 11 800 (52.49) 16 800 (74.73)

⁄

(11.11) 19 0.087 (2.21) 400 (181.44) 15 800 (70.28) 22 500 (100.08)

⁄

(12.70) 19 0.100 (2.54) 530 (240.40) 21 000 (93.41) 30 000 (133.45)

⁄

(14.29) 19 0.110 (2.79) 640 (290.30) 25 400 (112.98) 36 200 (161.02)

⁄

(15.88) 19 0.125 (3.18) 825 (374.21) 33 000 (146.79) 47 000 (209.07)

⁄

(19.05) 19 0.150 (3.81) 1,190 (539.78) 47 500 (211.29) 67 500 (300.25)

⁄

(22.22) 19 0.175 (4.44) 1,620 (734.82) 64 000 (284.69) 91 400 (406.57)

TABLE 2 Chemical Requirements

UNS

Designation Type

Composition, %

Carbon,

max

Manga-

nese,

max

Phos-

phorus,

max

Sulfur,

max

Silicon,

max Chromium Nickel Molybdenum Nitrogen,

max Other Elements

S30200 302 0.15 2.00 0.045 0.030 1.00 17.00–19.00 8.00–10.00 . . . 0.10 . . .

S30400 304 0.08 2.00 0.045 0.030 1.00 18.00–20.00 8.00–10.50 . . . 0.10 . . .

S30500 305 0.12 2.00 0.045 0.030 1.00 17.00–19.00 10.50–13.00 . . . . . . . . .

S31600 316 0.08 2.00 0.045 0.030 1.00 16.00–18.00 10.00–14.00 2.00–3.00 0.10 . . .

S31635 316Ti 0.08 2.00 0.045 0.030 1.00 16.00–18.00 10.00–14.00 2.00–3.00 0.10 Ti 5×(C+N) min,

0.70 max

S31640 316Cb 0.08 2.00 0.045 0.030 1.00 16.00–18.00 10.00–14.00 2.00–3.00 0.10 (Cb+Ta) 10×C min,

1.10 max

A368 − 95a (2019)

strand. A lot shall consist of all strand of one size (nominal

strand diameter, nominal wire diameter, and number of wires

per strand) and grade in each shipment.

12. Number of Tests and Retests

12.1 The number of samples tested shall be as follows:

Lot Size

No. of

Tests

Up to 500 ft (152 m), incl 1

Over 500 to 5000 ft (152 to 1524 m), incl 2

Over 5000 to 10 000 ft (1524 to 3048 m), incl

Over 10 000 ft (3048 m)

When a lot consists of only one reel, tests must be of necessity be limited to two

in number (one from each end).

12.1.1 Each strand sample shall be subjected to the tension

test as speciﬁed in 8.1.

12.1.2 In addition to the strand testing speciﬁed in 12.1.1,

the individual wires shall be subjected to the wrapping test

speciﬁed in 8.2. The number of individual wires to be tested

from each strand shall be as follows:

3-wire strand: test all 3 wires

7-wire strand: test any 4 wires

19-wire strand: test 3 wires from each layer (inner

and outer layer),

for a total of 6 tests

12.2 In case of reasonable doubt in the ﬁrst tests as to the

failure of the wire or strand to meet any requirement of this

speciﬁcation, two additional tests shall be made on samples of

wire or strand from the same coil (or reel). If failure occurs in

either of these tests, the lot shall be rejected. However, the

producer may, at his option, requalify individual coils (or reels)

by performing the required tests on an individual coil (or reel)

basis.

13. Packaging and Marking

13.1 Wire strand shall be furnished in standard lengths (see

13.1.1) and in compact coils or on reels (see 13.1.2)as

speciﬁed by the purchaser; otherwise lengths shall be as agreed

upon at the time of purchase.

13.1.1 Standard lengths of strand are as follows: 100 ft

(30.48 m), 250 ft (76.2 m), 500 ft (152.40 m), 1000 ft (304.80

m), 2500 ft (762.00 m), and 5000 ft (1524.00 m).

13.1.2 Standard practice is to furnish all strand of

⁄

in.

(11.11 mm) and over in diameter on reels in lengths of 1000 ft

(304.80 m) and over. Strand lengths of less than 1000 ft are

regularly furnished in coils.

13.2 The strand shall be protected against damage in ordi-

nary handling and shipping as agreed upon at the time of

purchase. Each coil (or reel) shall have a strong weather-proof

tag securely fastened to it showing the minimum breaking

strength, the nominal diameter of the strand, the length of the

strand, the steel type designation, ASTM Designation A368

dated _____, and the name or mark of the manufacturer.

14. Keywords

14.1 stainless steel; wire strand

ASTM International 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 International 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.

This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,

United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the above

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A368 − 95a (2019)

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摘要：

ASTM A368 - 95a (2019) 是一份由美国材料与试验协会（ASTM）发布的正式标准规范，主要涵盖不锈钢钢丝的技术要求、化学成分、机械性能、尺寸公差及测试方法。该标准最初于1995年发布并经过修订，2019年重新确认继续有效，适用于一般工程和工业用途的不同等级不锈钢钢丝，包括奥氏体、铁素体和马氏体不锈钢类型。标准详细规定了材料的拉伸强度、屈服强度、延伸率及硬度指标，同时明确了对表面质量、尺寸精度和检验程序的严格要求。无论是用于制造弹簧、编织网、金属丝绳、电缆，还是其他结构或装饰性应

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