04
ARTICLE NF-2000
MATERIAL
NF-2100GENERAL REQUIREMENTS
FOR MATERIAL
NF-2110SCOPE OF PRINCIPAL TERMS
EMPLOYED
(a)The term material as ud in this Subction is
defined in NCA-9000.The term Material Organization
(Metallic)is defined in NCA-9000.
(b)The requirements of this Article make reference
to the term thickness.For the purpo intended,the fol-
lowing definitions of nominal thickness apply:
(1)plate—the thickness is the dimension of the
short transver direction
(2)forgings—the thickness is the dimension
defined as follows:
(a)hollow forgings—the nominal thickness is
measured between the inside and outside surfaces(radial
thickness)悠客
(b)disk forgings(axial length less than the out-
side diameter)—the nominal thickness is the axial length
(c)flat ring forgings(axial length less than the
radial thickness)—for axial length≤2in.(50mm),the
axial length is the nominal thickness.For axial length
>2in.(50mm),the radial thickness is the nominal
thickness
(d)rectangular solid forgings—the least rectan-
gular dimension is the nominal thickness
(3)castings—thickness,t,is defined as the largest
nominal thickness of the load carrying portion of the
casting
NF-2120SUPPORT MATERIAL
NF-2121Permitted Material Specifications
(a)Except as provided in NF-2121(b),material for
supports shall conform to the requirements of the specifi-
cations for material listed in the tables of Section II,
Part D,including all applicable footnotes in the table,
applicable to the Class of construction,as indicated in
Table NF-2121(a)-1.
(b)The requirements of Article NF-2000do not apply
to exempt items as indicated in NF-1110(e).Certificates
8
of Compliance(NF-2130)are not required for exempt
items.
(c)Welding and brazing material ud in manufacture
of items shall comply with an SFA Specification in Sec-
金日蝉tion II,Part C,except as otherwi permitted in Section
IX,and shall also comply with the applicable require-
ments of this Article.The requirements of this Article
中科启元学校do not apply to materials ud as backing rings or backing
strips in welded joints.
NF-2122Special Requirements Conflicting With
Permitted Material Specifications
(a)Special requirements stipulated in this Article shall
apply in lieu of the requirements of the material specifica-
tions wherever the special requirements conflict with the
material specification requirements[NCA-3856.3(d)].
Where the special requirements include an examination,
test,or treatment which is also required by the material
specification,the examination,test,or treatment need be
performed only once.Required nondestructive examina-
tions shall be performed as specified for each product
form in NF-2500.Any examination,repair,test,or treat-
ment required by the material specification or by this
Article may be performed by the Material Organization
or the Certificate Holder,as provided in NF-4121.1.Pipe
or tube material ud under the rules of this Subction
need not be hydrostatically or pneumatically tested,pro-
vided the materials are not ud in a pressure retaining
function.
(b)Copper and copper bad alloys shall not be ud
for structural members.
NF-2124Size Ranges
Material outside the limits of size or thickness given
in any specification in Section II may be ud if the
material is in compliance with the other requirements of
the specification and no size limitation is given in the
rules for construction.In tho specifications in which
chemical composition or mechanical properties are indi-
cated to vary with size or thickness,any material outside
the specification range shall be required to conform to
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ARTICLE NF-2000—MATERIAL
T A B L E N F -2121(a )-1M A T E R I A L T A B L E S R E Q U I R E D F O R S U P P O R T S
D e s i g n S t r e s s A l l o w a b l e Y i e l d S t r e n g t h T e n s i l e S t r e n g t h I n t e n s i t y V a l u e s S t r e s s V a l u e s V a l u e s V a l u e s
T y p e a n d C l a s s
S m S S y S u
P l a t e a n d s h e l l
C l a s s 1-----------------ࠚ----------------------------------ࠚ----------------------------------ࠚC l a s s 2a n d M C ---------------------------------------------------ࠚ----------------------------------ࠚ----------------------------------ࠚC l a s s 3---------------------------------------------------ࠚ----------------------------------ࠚ----------------------------------ࠚB o l t i n g (a l l c l a s s e s )--------------------------------------------------------------------
-----------------ࠚ----------------------------------ࠚ
L i n e a r
C l a s s 1-------------------------------------------------------------------------------------ࠚ----------------------------------ࠚC l a s s 2a n d M C -------------------------------------------------------------------------------------ࠚ----------------------------------ࠚC l a s s 3-------------------------------------------------------------------------------------ࠚ----------------------------------ࠚB o l t i n g (a l l c l a s s e s )-------------------------------------------------------------------------------------ࠚ----------------------------------ࠚ
S t a n d a r d s u p p o r t
C l a s s 1-----------------ࠚP l a t e a n d ---------------------------------------------------ࠚ-----------------ࠚC l a s s 2-----------------s h e l l -----------------ࠚP l a t e a n d -----------------ࠚ-----------------ࠚL i n e a r
A l l t y p e s
C l a s s 3---------------------------------------------------ࠚ
s h e l l -----------------ࠚ-----------------ࠚB o l t i n g (a l l c l a s s e s )
-------------------------------------------------------------------------------------ࠚ
董怎么写-----------------ࠚ
A p p l i c a b l e T a b l e s
T a b l e U
A l l C l a s s e s
T a b l e 4
A l l C l a s s e s T a b l e s 2A 2
B ·
C l .1
T a b l e s 1A 1B ·
C l .2,C l .3,a n d M C
[N o t e (1)]
G E N E R A L N O T E S :(a )T a b l e Y -2p r o v i d e s p e r m a n e n t s t r a i n l i m i t i n g f a c t
o r f o r p l a t e -a n d s h e l l -t y p e s u p p o r t s .(b )T a b l e s T E a n d T M p r o v i d e v a l u e s o f t h e c o e f fic i e n t o f t h e r m a l e x p a n s i o n a n d m o d u l u s o f e l a s t i c i t y ,r e s p e c t i v e l y .
N O T E :(1)M u l t i p l y t a b u l a t e d v a l u e s b y 3t o a r r i v e a t S y v a l u e s .R o u n d u p t o t h e n e x t h i g h e r 0.5k s i (3.5M P a ).
9
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NF-21242004SECTION III,DIVISION1—NF NF-2180
the composition and mechanical properties shown for the nearest specified range[NCA-3856.3(d)].
NF-2130CERTIFICATION OF MATERIAL
(a)Material ud in the construction of supports shall
be certified.Certified Material Test Reports in accordance with NCA-3862shall be provided for material ud for primary members for Class1Plate-and Shell-Type Sup-ports,and Class1Linear-Type Supports.Material for other Class of supports and all Class of Standard Supports shall be provided with Certified Material Test Reports when impact testing is required(NF-2311).Cop-ies of the certificates shall be provided with the support. (b)Certificates of Compliance with the material speci-
fication,grade,class,and heat treated condition,as appli-cable,or Certified Material Test Reports shall be provided
by the Material Organization for material for all other supports,Standard Supports,and condary members of
all types and Class of supports.
(c)When Design Documents,such as the Design Report or Load Capacity Data Sheet,permit the u of alternative materials for which certificates of compliance are permitted,the alternative materials may be docu-mented in the Design Documents or the documentation
for the support in lieu of documenting the specific material ud.The requirements of NF-2150for identification of materials shall apply.
(d)When material Certificates of Compliance are per-mitted,the support manufacturer shall transmit copies of the material Certificates of Compliance applicable to each support.Alternatively,he shall execute and furnish a single document certifying a listing of all material speci-
肇庆酒店fications involved in the shipment.When a single docu-ment is furnished,his quality program shall provide for his retention of the material Certificates of Compliance
for each of the materials incorporated into the supports.
NF-2140WELDING MATERIAL
For the requirements governing the material to be ud
for welding,e NF-2400.
隐藏图标
NF-2150MATERIAL IDENTIFICATION
The identification of material requiring Certified Mate-rial Test Reports shall meet the requirements of NCA-3856.Material furnished by a Material Organiza-tion with Certificates of Compliance shall be identified
by a controlled system meeting the requirements of the applicable material specification,grade,and class.Identi-
fication of the material to the Material Organization’s
10Certificate of Compliance is not required after the support manufacturer has verified that the material meets the requirements of this Section.Material for small items shall be controlled during the manufacture of the supports so that they are identifiable as acceptable material at all times.Welding material shall be controlled during the repair of material and the manufacture and installation of supports so that it is identifiable as acceptable material until the material is actually consumed in the process (NF-4122).
NF-2160DETERIORATION OF MATERIAL
IN SERVICE
Consideration of deterioration of material caud by rvice is generally outside the scope of this Subction. It is the responsibility of the Owner to lect material suitable for the conditions stated in the Design Specifica-tions(NCA-3250),with specific attention being given to the effect of Service Conditions upon the properties of the material.
牛角鱼NF-2170HEAT TREATMENT TO ENHANCE
IMPACT PROPERTIES
Carbon steel,low alloy steels,and high alloy chromium (Series4XX)steels may be heat treated by quenching and tempering to enhance their impact properties.Post-weld heat treatment of the support at a temperature of not less than1,100°F(595°C)may be considered to be the tempering pha of the heat treatment.
NF-2180PROCEDURES FOR HEAT
TREATMENT OF MATERIAL
When heat treating temperature or time is required by the material specification and the rules of this Subction, the heat treating shall be performed in temperature-sur-veyed and-calibrated furnaces or the heat treating shall be controlled by measurement of material temperature thermocouples in contact with the material or attached to blocks in contact with the material or by calibrated pyrometric instruments.Heat treating shall be performed under furnace loading conditions such that the heat treat-ment is in accordance with the material specification and the rules of this Subction.
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NF-2200ARTICLE NF-2000—MATERIAL NF-2222.2
NF-2200MATERIAL TEST COUPONS
AND SPECIMENS FOR
FERRITIC STEEL MATERIAL
NF-2210HEAT TREATMENT
REQUIREMENTS
NF-2211Test Coupon Heat Treatment for
Ferritic Material1
If ferritic steel material is subjected to heat treatment during construction of a support,the material ud for the impact test specimens shall be heat treated in the same manner as the support,except that test coupons and specimens for P-No.1Group Nos.1and2material with
a nominal thickness of2in.(50mm)or less are not required to be so heat treated.The support manufacturer shall provide the Material Organization with the tempera-ture and heating and cooling rate to be ud.In the ca
of postweld heat treatment,the total time at temperature
or temperatures for the test material shall be at least80%
of the total time at temperature or temperatures during actual postweld heat treatment of the material,and the total time at temperature or temperatures for the test material,coupon,or specimen may be performed in a single cycle.
NF-2212Test Coupon Heat Treatment for
Quenched and Tempered Material
NF-2212.1Cooling Rates.When ferritic steel mate-rial is subjected to quenching from the austenitizing tem-perature,the test coupons reprenting tho materials shall be cooled at a rate similar to and no faster than the main body of the material except in the ca of certain forgings and castings(NF-2223.3and NF-2226.4).This rule shall apply for coupons taken directly from the mate-rial as well as for parate test coupons reprenting the material,and one of the general procedures described in NF-2212.2or one of the specific procedures described
in NF-2220shall be ud for each product form.
NF-2212.2General Procedures.One of the general procedures in NF-2212.2(a),(b),and(c)may be applied
to quenched and tempered material or test coupons repre-nting the material,provided the specimens are taken relative to the surface of the product in accordance with NF-2220.Further specific details of the methods to be ud shall be the obligation of the Material Organization and the Certificate Holder.
(a)Any procedure may be ud which can be demon-strated to produce a cooling rate in the test material that
1Any postweld heat treatment time which is anticipated to be applied
to the material or item after it is completed shall be specified in the Design Specifications.The Certificate Holder shall include this time in
the total time at temperature specified to be applied to the test specimens.
11matches the cooling rate of the main body of the product within25°F(14°C)and20c at all temperatures after cooling begins.
(b)If cooling rate data for the material and cooling rate control devices for the test specimens are available, the test specimens may be heat treated in the device to reprent the material,provided th
at the provisions of NF-2212.2(a)are met.
(c)When any of the specific procedures described in NF-2220are ud,faster cooling rates at the edges may be compensated for by:
(1)taking the test specimens at least t from a quenched edge,where t equals the material thickness;
(2)attaching a steel pad at least t wide by a partial penetration weld(which completely als the buffered surface)to the edge where specimens are to be removed;or
(3)using thermal barriers or insulation at the edge where specimens are to be removed.
It shall be demonstrated(and this information shall be included in the Certified Material Test Report)that the cooling rates are equivalent to NF-2212.2(a)or(b).
NF-2220PROCEDURE FOR OBTAINING
TEST COUPONS AND
SPECIMENS FOR QUENCHED
AND TEMPERED MATERIAL
NF-2221General Requirements
The procedure for obtaining impact test specimens for quenched and tempered material is related to the product form.Coupon and specimen location shall be as required by the material specification,except as stated in the fol-lowing paragraphs of this Subarticle.References to dimensions signify nominal values.
NF-2222Plates
NF-2222.1Number of Tension Test Coupons.The number of tension test coupons required shall be in accor-dance with the material specification and with SA-20, except that from carbon steel plates weighing42,000lb (20000kg)and over and alloy steel plates weighing 40,000lb(18000kg)and over,two tension test coupons shall be taken,one reprenting the top end of the plate and one reprenting the bottom end of the plate.
NF-2222.2Orientation and Location of Coupons. Coupons shall be taken so that specimens shall have their longitudinal axes at least1⁄4t from a rolled surface and with the midlength of the specimen at least t from any heat treated edge,where t is the nominal thickness of
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NF-2222.22004SECTION III,DIVISION1—NF NF-2225.1
the material.The orientation of the coupons shall be as specified in the material specification.
NF-2222.3Requirements for Separate Test Cou-pons.Where a parate test coupon is ud to reprent the support material,it shall be of sufficient size to ensure that the cooling rate of the region from which the test coupons are removed reprents the cooling rate of the material at least1⁄4t deep and t from any edge of the product.Unless cooling rates applicable to the bulk pieces
or product are simulated in accordance with NF-2212.2(b),the dimensions of the coupon shall not be less than3t؋3t؋t,where t is the nominal material thickness.
NF-2223Forgings
NF-2223.1Location of Coupons.Coupons shall be taken so that specimens shall have their longitudinal axes
at least1⁄4t from any surface and with the midlength of the specimens at least t from any cond surface,where
t is the maximum heat treated thickness.A thermal buffer
as described in NF-2212.2(c)may be ud to achieve the conditions,unless cooling rates applicable to the bulk forgings are simulated as otherwi provided in NF-2212.2.
NF-2223.2Very Thick and Complex Forgings.Test coupons for forgings that are both very thick and complex, such as trunnions,support forgings,flanges,and other complex forgings that are contour shaped or machined
to esntially thefinished product configuration prior to heat treatment,may be removed from prolongations or other stock provided on the product.The Certificate Holder shall specify the surfaces of thefinished product subjected to high tensile stress in rvice.The coupons shall be tak
en so that specimens shall have their longitudi-nal axes at a distance below the nearest heat-treated sur-face,equivalent to at least the greatest distance that the indicated high tensile stress surface will be from the nearest surface during heat treatment,and with the mid-length of the specimens a minimum of twice this distance from a cond heat-treated surface.In any ca,the longi-tudinal axes of the specimens shall not be nearer than3⁄4 in.(19mm)to any heat-treated surface and the midlength
of the specimens shall be at least11⁄2in.(38mm)from any heat-treated surface.
NF-2223.3Coupons From Separately Produced Test Forgings.Test coupons reprenting forgings from one heat and one heat treatment lot may be taken from
a parately forged piece under the conditions given in NF-2223.3(a)through(e).
(a)The parate test forging shall be of the same heat
of material and shall be subjected to substantially the
12same reduction and working as the production forging it reprents.
(b)The parate test forging shall be heat treated in the same furnace charge and under the same conditions as the production forging.
(c)The parate test forging shall be of the same nomi-nal thickness as the production forging.
(d)Test coupons for simple forgings shall be taken so that specimens shall have their longitudinal axes at the region midway between midthickness and the surface and with the midlength of the specimens no nearer to any heat treated edge than a distance equal to the forging thickness,except when the thickness–length ratio of the production forging does not permit,in which ca a pro-duction forging shall be ud as the test forging and the midlength of the specimens shall be at the midlength of the test forgings.
(e)Test coupons for complex forgings shall be taken in accordance with NF-2223.2.
NF-2223.4Test Specimens for Forgings.When test specimens for forgings are to be taken under the applica-ble specification,the Inspector shall have the option of witnessing the lection,placing an identifying stamping on them,and witnessing the testing of the specimens. NF-2224Location of Coupons
(a)Bars.Coupons shall be taken so that specimens shall have their longitudinal axes at least1⁄4t from the outside or rolled surface and with the midlength of the specimens at least t from a heat treated end,where t is either the bar diameter or thickness.
(b)Bolting Material.For bolting material,the coupons shall be taken in conformance with the applicable material specification and with the midlength of the specimen at least one diameter or thickness from a heat treated end. When the studs,nuts,or bolts are not of sufficient length, the midlength of the specimen shall be at the midlength of the studs,nuts,or bolts.The studs,nuts,or bolts lected to provide test coupon material shall be identical with respect to the quenched contour and size,except for length,which shall equal or exceed the length of the reprented studs,nuts,or bolts.
NF-2225Tubular Products and Fittings
NF-2225.1Location of Coupons.Coupons shall be taken so that specimens shall have their longitudinal axes at least1⁄4t from the inside or outside surface and with the midlength of the specimens at least t from a heat treated end,where t is the nominal wall thickness of the tubular product.
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