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69 views3 pagesA0027
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aay Designation: A 27/A 27M - 95
Standard Specification for
sapien ey mens wont
eae
Steel Castings, Carbon, for General Application’
his
ard sisted under the fied designation A 27/ 27M: the number immediately feoing the designation indices the year
ep adopio o Inthe es reve, te Jaro” revise A number n panties inal he Year fat approval
‘Aspen coslon indicates an editoral change sinc he ast revion or eappoval.
‘Tis standard as bon apron for ws by apoio the Department of Defense. Cont the DoD Ind of Spesiicanins and
Standards fr the isc par ane whic bas bon adoped the Deparment f Defeat
1, Scope
LL This specification covers carbon steel castings for
‘general applications that require up to 70 ksi [485 MPa]
‘minimum tensile strength.
Nore—The grades covered by this specication represent macrals
that ae suitable for assembly with othr ste castings or wrought ste!
pars by fasion weldiag It aot intended to imply that al Ise wads
posses the same degree ef weldabity or that the same welling
Techniques ean be vss on al astings. I isthe responsibicy of the
Durchaser to extablish for himself a suitable Welding tchnigue,
1.2 Several grades and two classes of steel castings are
covered, as indicated below. The grade and class desired shall
be specified by the purchaser.
12.1 Grade N-1—Chemical analysis only.
122 Grade N-2—Heat-treated but not_mechanically
tested,
1.23 Grade U-60.30 [415-205]—Mechanically tested but
‘no heat-treated.
1.2.4 Grades 60-30 [415-205], 65-35 [450-240], 70-36
{485-250}, and 70-40 [485-275]—Heat-treated and mechan-
sealy tested,
1.25 Class | and Class 2 steel castings shall be specified in
accordance with 9.2.
1.3 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 specification, Inch-pound units are applicable for mate-
Tal ordered to Specification A 27 and SI units for material
crdered to Specification A 27M
2. Referenced Documents
2.1 ASTM Standards
A370 Test Methods and Definitions for Mechanical
‘Testing of Steel Products?
A732/A732M Specification for Castings, Investment,
Carbon and Low-Alloy Steel for General Application,
and Cobalt Alloy for High Strength at Elevated
Temperatures?
"This speciation s ude earn af ASTM Commitee A Se.
Staines Ste abd Related Alloy ashe iret respon Satomi
DI or Castings
‘Cutet eon approved Nov. 10,1995. Publish Ianucy 1996. Oviiaty
pubinhed ae 27-9, Las previous edition A21/A 27M ~3
nat! Bok of ASTM Standards, Vel 01.63.
ama fk of ASTM Stender, VokO1 02
A 7B1/A 781M Specification for Castings, Steel and Alloy,
‘Common Requirements, for General Industrial Use?
General Conditions for Delivery
3.1 Material furnished to this specification shall conform
to the requirements of Specification A 781/A 781M, ine
cluding any supplementary requirements that are indicated
in the purchase order. Failure to comply with the general
requirements of Specification A 781/A 781M constitutes
nonconformance with this specification. In case of conllict
‘between the requirements of this specification and Specifica-
tion A 781/A 781M, this specification shall prevail.
4. Ordering Information
4.1 Orders for material under this specification should
include the following information in proper sequence.
4.1.1 Quantity,
4.1.2 Specification, grade (1.2), and clas (9.2),
4.1.3 Description of the casting by pattern number or
drawing,
4.1.4 Options in the specification, and
4.1.5 Supplementary requirements desired,
standards of acceptance.
5. Heat Treatment
5.1 All castings of Grades N-2, 60-30 [415-205], 65-35
{450-240}, 70-36 [485-250], and 70-40 [485-275] shall be
heat-treated by full annealing, normalizing, normalizing and
tempering, or quenching and tempering. Unless otherwise
specified in the inquiry, contract, or order, the castings may
be heat-ireated by any one or combination of these heat-
treatments at the option of the manufacturer.
5.1.1 Heateireatment shall be performed after castings
have been allowed to cool from the pouring temperature to
below the transformation range,
5.2 Furnace temperatures for heat-treating shall be regu-
lated by the use of pyrometers,
including
6. Chemical Composition
6.1 The steel shall conform to the requirements as to
‘chemical composition prescribed in Table 1. Product anal-
ysis tolerances shall conform to the Product Analysis Toler-
‘ances shown in Specification A 781/A 781M, When residual
clement chemical content is of interest to the purchaser, S54
may be considered
17. Tensile Properties
7.1. Except for Grades N-1 and N-2, one tension test shall
be performed on each heat and the mechanical properties 4b a27jazm™m
TABLE 1 Chemical Requicoments
a Composition =
Foon an Marganese * nar ‘icon mas Si Prowphons, mae
Grade 1 a6 078 080 006 305
reas 2 035 020 080 008 B08
‘Grade 60:90 [415 205) 025 075 280 006 005
(Grade 60:39 [615:205), 930 080 080 008 908
Grade 65-95 480-240) O30 070 080 098 065
‘rm 70.96 (485-250), 036 070 080 208 oes
(rage 70-40 685-275) 2s 120 808
‘addiion te grade desgnaton see 9 2)
"Speak Clas + or Coos
{For each edacton of. & carbon baton the manmucn spaces, on crease of 0.04 % manganeen ove the maxcensn soeciod wil be permite oa maxim
of 140% fr Crude 70-40 1485-275] ae 00 te har ade
TABLE 2 Tensile Requirements
5 orale Sg rm, Vii Point, in Eangaten ho ‘Raaichen ot ea,
rece st (Pa [Drm minx nn
‘Grad D0 ATE DOS] 0 0 205), 2 30
‘rade 80:90 615-205), 0 [ats 30205) 2 Es
(ead 65.95 450.240), 5450} 38 (240) a 35
‘Grade 70-38 485-250) 70 36 (250) 2 30
(Grace 70-40 98.275]° 70685) 0779) w
“ Speaty Class 1 cr Cass 2 addon to grade deeignaton (soe 9.2,
‘re Cl tet bas ate used tr aseg os provid rf ths spacicaon, the gage lenght eckesd secton urate ato shall ba 4101
© Gade 7040 [85-275] may bo vend 10 mest to equreron of Grade 70-0 485 280}, who soos upon between the manufacturer ag the purchase
TABLE 8 Normally Expected Deviation of Linear Casting
Bhaopert Oran ron
Spies 5, ne Tar
Ove 310775 10 178) et eae
(ver 71620175 1 800) es te)
TABLE 4 Gate and
ier Gate Mestre OF raecien, —Dapecn,
mene, fm] tee iw
Wpios coy ps 9) YS)
vr 4868130 2005 et vial wel
‘ver 8020 (20 to S00) red sing) “eat
(vt 20 30 80 0 780) si ve}
rer 3 (50) ssl eh
siege ea) haa
Beware = =
Sor 109 as 10 @ 8
Seimei me mouso ms £9 3
ore oom 0) 38 8
Devise do nol apy lone os caadned Wom & Gain Gaming
in Table 2. The tension tes
with Test Methods and Definitions A 370.
‘thus determined shall conform to the requirements specified
shall be performed in accordance
castings they represent. When specified by the purchaser, the
test bars shall be heatireated with the castings.
7.5 Test specimens shall be machined to the form and
dimensions shown in Figs. 4 and 5 of Test Methods and
Definitions A 370.
716 any specimen is machined improperly or if aws ae
revealed by machining or during testing, the specimen may
be discarded and another substituted from the same heat.
7.7 When this specification is applied to investment
castings, test coupons and tension test specimens shall be
obtained and prepared as directed in $3.2 of Specification
‘A'732/A 732M. Test coupons shall be heat treated. as pre-
seribed in 7.4
Retests
8.1 If the results of the mechanical tests for any heat, Jot,
oF casting do not conform to the requirements specified,
reiests are permitted as outlined in Test Methods and
Definitions A370. At the manufacturer's option, castings
may be reheat-treated and retested. When castings are
reheat-treated, they may not be reaustenitized more than 3
times without the approval of the purchaser, Testing after
seheat treatment shall consist of the full number of speci-
mens taken from locations complying with the specification
or order,
9. Rework and Retreatment
9.1 All welds shall be inspected to the same quality
. 4h A27/a27™
SUPPLEMENTARY REQUIREMENTS
A list of standardized supplementary requirements for use at the option of the purchaser is described in
Specification A 781/A 781M. Those which are considered suitable for use with this specification are listed
below by title only. Additional supplementary requirements suitable for use with this specification at the
option of the purchaser are described below. One or more of the supplementary requirements indicated
below may be included in the purchaser's
order or contract. When so included,
a sup
plementary requirement shall have the same force as if it were in the body of the specification, Sup-
plementary requirements details not fully described shall be agreed upon between the purchaser and the
supplier, but shall not negate any of the requirements in the body of the specification.
SI. Magnetic Particle Examination
‘S2. Radiographic Examination
. Liquid Penetrant Examination
|. Ultrasonic Examination
3,
4,
‘86. Certification
88.
99,
3. Marking
Charpy Impact Test
S10. Hardness Test
S12, Test Report
S13. Unspecified Elements
S14. Tension Test from Castings
S51. Permissible Variations in Dimensional Tolerances for
Castings Made from Mounted Patterns
S51.1 Tolerances for commercial steel castings (SSI.1.1)
‘made from mounted patterns and the surfaces that are n01 to
bbe machined shall be in accordance with Table 3. Metal
match plate patterns and precise molding methods can
produce closer tolerances than the values shown in Table 3.
Complex casting designs may require different permissible
variations than those listed in Table 3,
S5I.L.1 The term “commercial castings” does not cover
castings requiring special fixtures for gaging, or finishing,
castings by grinding to special tolerance gages beyond the
normal requirements as listed in Table 3.
952. Gate and Riser Projections for Castings Made from
Mounted Patterns
$52.1. Castings shall have gates and risers removed in such
a manner that no riser or gate stub projects or a depression is
‘made beyond or below the casting design contour in an
amount that would exceed the values given in Table 4,
‘$53. Weight Deviation for Castings Made from Mounted
Patterns
$53.1 The allowable deviations from the average casting
weight are shown in Table 5.
‘S54. Chemical Analysis for Residual Elements
$54.1 The manufacturer shall determine the percentage of
clements specified as follows, using procedures specified in
Specification A 781/A 781M. The chemical analysis thus