ASTM B691-95

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Designation: B 691 – 95
Standard Specification for
Iron-Nickel-Chromium-Molybdenum Alloys (UNS N08366 and
UNS N08367) Rod, Bar, and Wire
This standard is issued under the fixed designation B 691; 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 round, square, hexagon, octagon, or rectangular solid section in
straight lengths.
1.1 This specification covers iron-nickel-chromium-
3.1.1.2 rod—hot-finished material of round, square, hexa-
molybdenum alloys (UNS N08366 and UNS N08367)* in the
gon, octagon, or rectangular solid section furnished in coils for
form of hot-finished and cold-finished rounds, squares, hexa-
subsequent cold drawing into finished products.
gons, octagons, and rectangles.
3.1.1.3 wire—cold-finished material of round, square, hexa-
1.2 The values stated in inch-pound units are to be regarded
gon, octagon, or rectangle solid section furnished in coils.
as the standard. The values given in parentheses are for
information only.
4. Ordering Information
1.3 The following safety hazards caveat pertains only to the
4.1 Orders for material under this specification shall include
test methods portion, Section 12, of this specification: This
the following information, as required:
standard does not purport to address all of the safety concerns,
4.1.1 Quantity (feet, metres, or number of pieces),
if any, associated with its use. It is the responsibility of the user
4.1.2 Form (rod, bar, wire),
of this standard to establish appropriate safety and health
4.1.3 Name of material or UNS number,
practices and determine the applicability of regulatory limita-
4.1.4 Finish (see 8.2),
tions prior to use.
4.1.5 Dimensions, including length,
2. Referenced Documents 4.1.6 Certification, if required (Section 15),
4.1.7 Purchaser’s inspection, if required (Section 13),
2.1 ASTM Standards:
4.1.8 ASTM designation and year of issue, and
E 8 Test Methods for Tension Testing of Metallic Materials
4.1.9 Samples for product analysis, if required.
E 29 Practice for Using Significant Digits in Test Data to
Determine Conformance with Specifications
5. Chemical Composition
E 140 Hardness Conversion Tables for Metals (Relationship
5.1 The material shall conform to the composition limits
Between Brinell Hardness, Vickers Hardness, Rockwell
specified in Table 1.
Hardness, Rockwell Superficial Hardness, and Knoop
2 5.2 If a product (check) analysis is made by the purchaser,
Hardness)
the material shall conform to the permissible variations for
E 1473 Test Methods for Chemical Analysis of Nickel,
4 product (check) analysis in Table 1.
Cobalt, and High-Temperature Alloys
6. Mechanical Properties and Other Requirements
3. Terminology
6.1 The material shall conform to the mechanical property
3.1 Definitions of Terms Specific to This Standard:
requirements specified in Table 2.
3.1.1 The terms rod, bar, and wire, as used in this specifi-
cation, are described as follows:
7. Dimensions and Permissible Variations
3.1.1.1 bar—hot-finished or cold-finished material of
7.1 Size:
7.1.1 Rounds—The permissible variations in size of cold-
This specification is under the jurisdiction of ASTM Committee B-2 on
finished round shall be as given in Table 3. For hot-finished
Nonferrous Metals and Alloys and is the direct responsibility of Subcommittee
round bars and rod, they shall be as given in Table 4.
B02.07 on Refined Nickel and Cobalt, and Alloys Containing Nickel or Cobalt, or
Both, as Principal Constituents. 7.1.2 Squares—The permissible variations in size of cold-
Current edition approved Aug. 15, 1995. Published October 1995. Originally
finished square bars shall be as given in Table 5. For hot-
published as B 691 – 81. Last previous edition B 691 – 94.
finished square bars and rods, they shall be as given in Table 4.
* New designation established in accordance with ASTM E 527 and SAE J1086,
7.1.3 Hexagons and Octagons—The permissible variations
Practice for Numbering Metals and Alloys.
Annual Book of ASTM Standards, Vol 03.01.
in size of cold-finished hexagons and octagons shall be as
Annual Book of ASTM Standards, Vol 14.02.
given in Table 5. For hot-finished bar and rod hexagons and
Annual Book of ASTM Standards, Vol 03.06.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
B 691
octagons they shall be as given in Table 6. be taken from such locations in each lot (see 9.1.2) as to be
7.1.4 Flats (Rectangles)—The permissible variations in representative of that lot.
width and thickness of cold-finished flats shall be as given in
10. Number of Tests and Retests
Table 7 for bars and for wire in Table 8. For hot-finished flat
bars and rods, the tolerances for width and thickness shall be as 10.1 Chemical Analysis—One test per lot.
given in Table 9.
10.2 Mechanical Tests and Tension Tests—One test per lot.
7.2 Out-of-Round—Hot-finished rounds and cold-finished 10.3 Retests—If the specimen used in the mechanical test of
rounds (except forging quality), all sizes, in straight lengths,
any lot fails to meet the specified requirements, an additional
shall not be out-of-round by more than shown in Table 4 and specimen shall be taken from a different sample piece and
Table 3.
tested. The results of this test specimen shall meet the specified
7.3 Corners—Cold-finished squares, rectangles, hexagons requirements.
and octagons will have equal angles and sharp corners.
11. Specimen Preparation
7.4 Machining Allowances—When the surfaces of hot-
finished material are to be machined, the allowances given in
11.1 Tension test specimens shall be taken from material in
Table 10 are recommended for normal machining operations. the final condition (temper) and tested in the direction of
7.5 Length:
fabrication.
7.5.1 Unless multiple, nominal, or cut lengths are specified, 11.2 All rod and bar shall be tested in full cross-section size
random mill lengths shall be furnished.
when possible. When a full cross-section size test cannot
7.5.2 When bars are ordered in multiple lengths, ⁄4 in. (6.4 be performed, the largest possible round specimen shown in
mm) will be allowed for each multiple cut, unless otherwise
Test Methods E 8 shall be used. Longitudinal strip specimens
specified.
shall be prepared in accordance with Test Methods E 8 for flats
7.5.3 The permissible variations in length of hot or cold-
up to ⁄2 in. (12.7 mm), incl, in thickness that are too wide to be
finished bars shall be as specified in Table 11 or Table 12
pulled full size.
depending upon whether or not the material is specified to be
12. Test Methods
machine-cut after straightening.
7.6 Ends:
12.1 Determine the chemical composition and mechanical
7.6.1 Bars ordered to random or nominal lengths will be
properties of the material, as enumerated in this specification,
furnished with either cropped or saw-cut ends.
in the case of disagreement, in accordance with the following
7.6.2 Bars ordered to cut lengths will be furnished with
ASTM methods:
square saw-cut or machine cut ends.
12.1.1 Chemical Analysis—Test Methods E 1473.
7.7 Straightness:
12.2 Tension test— Test Methods E 8.
7.7.1 The permissible variations in straightness of cold-
12.3 Determination of significant places—For purposes of
finished bars shall be as specified in Table 13.
determining compliance with the specified limits for the
7.7.2 The permissible variations in straightness of hot-
requirements of the properties listed in the following table,
finished bars shall be as specified in Table 13.
round an observed or a calculated value as indicated, in
accordance with the rounding methods of Practice E 29.
8. Workmanship, Finish, and Appearance
Requirement Rounded unit for observed or calculated value
8.1 The material shall be uniform in quality and condition, Chemical composition nearest unit in the last right-hand place of
figures of the specified limit
smooth, commercially straight or flat, and free of injurious
Tensile strength and nearest 1000 psi (7 MPa)
imperfections.
yield strength
8.2 Finishes available include hot-rolled, hot rolled- Elongation nearest 1 %
annealed-descaled, cold-drawn, ground, turned, and machined.
13. Inspection
9. Sampling
13.1 Inspection of the material shall be agreed upon be-
tween the purchaser and the producer or supplier as part of the
9.1 Lot Definition:
purchase contract.
9.1.1 A lot for chemical analysis shall consist of one heat.
9.1.2 Lots for mechanical testing shall consist of the mate-
14. Rejection and Rehearing
rial from one heat, in the same condition (temper), and of the
same specified size (excepting length) and cross-section. 14.1 Material that fails to conform to the requirements of
this specification may be rejected. Rejection shall be reported
9.2 Test Material Selection:
to the producer or supplier promptly and in writing. In case of
9.2.1 Sampling for Chemical Analysis:
9.2.1.1 An analysis of each lot shall be made by the dissatisfaction with the results of the test, the producer or
supplier may make claim for a rehearing.
manufacturer from a representative sample obtained during the
pouring of the heat or subsequent processing.
15. Certification
9.2.1.2 If samples for product (check) analysis are specified,
a representative sample shall be taken from each lot of finished 15.1 When specified in the purchase order or contract, a
material. producer’s or supplier’s certification shall be furnished to the
9.2.2 Sampling for Mechanical Testing—Samples of the purchaser that the material was manufactured, sampled, tested,
material to provide test specimens for mechanical testing shall and inspected in accordance with this specification and has
B 691
TABLE 2 Mechanical Properties
been found to meet the requirements. When specified in the
purchase order or contract, a report of the test results shall be Cold-Finished-An-
nealed and Hot- Forging Quality
furnished.
Finished-Annealed (All Sizes)
(All Sizes)
N08366 N08367 N08366 N08367
16. Product Marking
AA
Tensile strength, min, 75 (517) 95 (655)
16.1 Each bundle or shipping container shall be marked
ksi (MPa)
AA
Yield strength, 0.2 % 30 (206) 45 (310)
with the name of the material, UNS number, heat number,
offset, min, ksi (MPa)
condition (temper), the specification number, the size, gross,
AA
Elongation in 2 in. or 50 30 30
tare, and net weights, consignor and consignee address, con-
mm, or 4D, min, %
tract or order number, or such other information as may be A
No tensile properties are required on forging quality.
defined in the contract or purchase order.
16.2 When so specified on the contract or purchase order,
TABLE 3 Permissible Variations in Diameter Cold-
larger size bars shall be marked individually with the name of
Finished Round Bars and Wire
the material, heat number, condition (temper), the specification
Diameter toler-
A,B,C
ance, in. (mm)
number, size, and producer’s name or mark.
Specified Diameter, in. (mm)
Plus and Minus
17. Keywords
0.0030 (0.076) to 0.0048 (0.122), excl 0.0001 (0.003)
0.0048 (0.122) to 0.0080 (0.203), excl 0.0002 (0.005)
17.1 bar; N08366; N08367; rod; wire
0.0080 (0.203) to 0.0120 (0.305), excl 0.0003 (0.008)
0.0120 (0.305) to 0.0240 (0.610), excl 0.0004 (0.010)
0.0240 (0.610) to 0.0330 (0.838), excl 0.0005 (0.013)
TABLE 1 Chemical Requirements
0.0330 (0.838) to 0.0440 (1.118), excl 0.0008 (0.020)
0.0440 (1.118) to 0.3125 (7.938), excl 0.001 (0.03)
Composition Limits, % Product (Check)
0.3125 (7.938) to 0.5000 (12.700), excl 0.0015 (0.038)
Analysis Vari-
0.5000 (12.700) to 1.000 (25.4), excl 0.002 (0.05)
ations, under
1.000 (25.40) to 1.500 (38.10), excl 0.0025 (0.06)
Element min or over
1.500 (38.10) to 4.000 (101.6), incl 0.003 (0.08)
max, of the
N08366 N08367
Specified Limit A
Diameter tolerances are over and under as shown in the above table. Also,
of Element, %
rounds can be produced to tolerances all over and nothing under, or all under and
nothing over, or any combination of over and under, if the total spread in diameter
Carbon 0.035 max 0.030 max 0.005
tolerance for a specified diameter is not less than the total spread shown in the
Manganese 2.00 max 2.00 max 0.04
table.
Silicon 1.00 max 1.00 max 0.05
B
The maximum out-of-round tolerance for round wire is one-half of the total size
Phosphorus 0.040 max 0.040 max 0.005
tolerance shown in the above table.
Sulfur 0.030 max 0.030 max 0.005
C
When it is necessary to heat treat or heat treat and pickle after cold finishing,
Chromium 20.00 to 22.00 20.00 to 22.00 0.25
size tolerances are double those shown in the table for sizes 0.0240 in. (0.610 mm)
Nickel 23.50 to 25.50 23.50 to 25.50 0.20
and over.
Molybdenum 6.00 to 7.00 6.00 to 7.00 0.15
Nitrogen . 0.18 to 0.25 0.01
A
Iron remainder remainder
Copper . 0.75 max 0.04
A
Iron shall be determined arithmetically by difference.
B 691
TABLE 4 Permissible Variations in Size of Hot-Finished Round and Square Bars and Rods
A
Permissible Variations from Specified Size, Out-of-Round or
B
in. (mm) Out-of-Square, in.
Specified size, in. (mm)
(mm)
Plus Minus
1 5
⁄4 (6.4) to ⁄16 (7.9), incl 0.005 (0.13) 0.005 (0.13) 0.008 (0.20)
5 7
Over ⁄16 (7.9) to ⁄16 (11.1), incl 0.006 (0.15) 0.006 (0.15) 0.009 (0.23)
7 5
Over ⁄16 (11.1) to ⁄8 (15.9), incl 0.007 (0.18) 0.007 (0.18) 0.010 (0.25)
5 7
Over ⁄8 (15.9) to ⁄8 (22.2), incl 0.008 (0.20) 0.008 (0.20) 0.012 (0.30)
Over ⁄8 (22.2) to 1 (25.4), incl 0.009 (0.23) 0.009 (0.23) 0.013 (0.33)
Over 1 (25.4) to 1 ⁄8 (28.6), incl 0.010 (0.25) 0.010 (0.25) 0.015 (0.38)
1 1
Over 1 ⁄8 (28.6) to 1 ⁄4 (31.8), incl 0.011 (0.28) 0.011 (0.28) 0.016 (0.41)
1 3
Over 1 ⁄4 (31.8) to 1 ⁄8 (34.9), incl 0.012 (0.30) 0.012 (0.30) 0.018 (0.46)
3 1
Over 1 ⁄8 (34.9) to 1 ⁄2 (38.1), incl 0.014 (0.36) 0.014 (0.36) 0.021 (0.53)
1 1 1
Over 1 ⁄2 (38.1) to 2 (50.8), incl ⁄64 (0.4) ⁄64 (0.4) 0.023 (0.58)
1 1
Over 2 (50.8) to 2 ⁄2 (63.5), incl ⁄32 (0.8) 0 0.023 (0.58)
1 1 3
Over 2 ⁄2 (63.5) to 3 ⁄2 (88.9), incl ⁄64 (1.2) 0 0.035 (0.89)
1 1 1
Over 3 ⁄2 (88.9) to 4 ⁄2 (114.3), incl ⁄16 (1.6) 0 0.046 (1.17)
1 1 5
Over 4 ⁄2 (114.3) to 5 ⁄2 (139.7), incl ⁄64 (2.0) 0 0.058 (1.47)
1 1 1
Over 5 ⁄2 (139.7) to 6 ⁄2 (165.1), incl ⁄8 (3.2) 0 0.070 (1.78)
1 5
Over 6 ⁄2 (165.1) to 8 (203.2), incl ⁄32 (4.0) 0 0.085 (2.16)
A
Out-of-round is the difference between the maximum and minimum diameters of the bar, measured at the same cross section.
B
Out-of-square section is the difference in the two dimensions at the same cross section of a square bar, each dimension being the distance between opposite faces.
TABLE
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