Designation:F138–03
Standard Specification for
Wrought18Chromium-14Nickel-2.5Molybdenum Stainless Steel Bar and Wire for Surgical Implants(UNS S31673)1
This standard is issued under thefixed designation F138;the number immediately following the designation indicates the year of original adoption or,in the ca of revision,the year of last revision.A number in parenthes indicates the year of last reapproval.A superscript epsilon(e)indicates an editorial change since the last revision or reapproval.
This standard has been approved for u by agencies of the Department of Defen.
1.Scope*
1.1This specification covers the requirements for wrought 18chromium-14nickel-
2.5molybdenum stainless steel bar and wire ud for the manufacture of surgical implants.
1.2The values stated in inch-pound units are to be regarded as the standard.The SI units given in parenthes are for information only.
2.Referenced Documents
2.1ASTM Standards:
A262Practices for Detecting Susceptibility to Intergranu-lar Attack in Austenitic Stainless Steels2
A484/A484M Specification for General Requirements for Stainless Steel Bars,Billets,and Forgings2
A555/A555M Specification for General Requirements for Stainless Steel Wire and Wire Rods2
A751Test Methods,Practices,and Terminology for Chemical Analysis of Steel Products2
E8Test Methods for Tension Testing of Metallic Materials3 E8M Test Methods for Tension Testing of Metallic Mate-rials[Metric]3
E45Test Methods for Determining the Inclusion Content of Steel3
E112Test Methods for Determining Average Grain Size3 E407Practice for Microetching Metals and Alloys3
F981Practice for Asssment of Compatibility of Bioma-terials for Surgical Implants with Respect to Effect of Materials in Muscle and Bone4
F1350Specification for Wrought18Chromium-14Nickel-
2.5Molybdenum Stainless Steel Surgical Fixation Wire
(UNS S31673)4
2.2ISO Standards:
ISO5832-1Implants for Surgery—Metallic Materials—
Part1:Wrought Stainless Steel5
ISO6892Metallic Materials—Tensile Testing5
中标通知书范本
2.3ASQ Standard:
C1Specification of General Requirements for a Quality Program6
3.General Requirements for Delivery
3.1In addition to the requirements of this specification,all requirements of the current editions of Specifications A484/ A484M and A555/A555M shall apply.
3.2In the ca where a conflict exists between this specifi-cation and tho listed in2.1and2.2,this specification shall take precedence.
4.Ordering Information
4.1Inquiries and orders for material under this specification shall include the following information:
4.1.1Quantity(weight or number of pieces),
4.1.2ASTM designation,
4.1.3Form(bar,wire,fine wire),
4.1.4Condition(e
5.1),
4.1.5Mechanical properties(if applicable,for special con-ditions),
4.1.6Finish(e
5.2),
4.1.7Applicable dimensions including size,thickness, width,and length(exact,random or multiples)or print number, and
4.1.8Special requirements.
5.Materials and Manufacture
5.1Condition:
5.1.1Bar and wire shall be furnished,as specified,in the hot-worked,annealed,cold-worked,or extra hard condition (e Table1).
5.1.2Fine wire shall be furnished,as specified,in the cold-drawn condition(e Table2).
5.2Finish:
1This specification is under the jurisdiction of ASTM Committee F04on Medical and Surgical Materials and Devices and is the direct responsibility of Subcommittee F04.12on Metallurgical Materials.
Current edition approved June10,2003.Published July2003.Originally
approved in1971.Last previous edition approved in2000as F138–00.
2Annual Book of ASTM Standards,V ol01.03.
3Annual Book of ASTM Standards,V ol03.01.
4Annual Book of ASTM Standards,V ol13.01.
5Available from American National Standards Institute(ANSI),25W.43rd St., 4th Floor,New York,NY10036.
6Available from American Society for Quality(ASQ),600N.Plankinton Ave., Milwaukee,WI53203.
1
*A Summary of Changes ction appears at the end of this standard. Copyright©ASTM International,100Barr Harbor Drive,PO Box C700,West Conshohocken,PA19428-2959,United States.
5.2.1Types offinish available for bar and wire products are cold-drawn,pickled,ground,ground and polished,or as specified in the purcha order.
5.2.2Types offinish available forfine wire products are cold-drawn,ground,ground and polished,or as specified in the purcha order.
6.Chemical Composition
6.1The heat analysis shall conform to the requirements as to chemical composition specified in Table3.
6.1.1The compositional requirement shall meet the follow-ing:
%Cr13.33%Mo$26.0(1) 6.1.2Requirements for the major and minor elemental constituents are listed in Table3.Also listed are important
residual elements.Analysis for elements not listed in Table3is not required to certify compliance with this specification. 6.2Product Analysis—Product analysis tolerances do not broaden the specified heat analysis requirements,but cover variations between laboratories in the measurement of chemi-cal content.The manufacturer shall not ship material that is outside the limits specified in Table3.Product analysis limits shall be as specified in Table4.
6.2.1The product analysis is either for the purpo of verifying the composition of a heat or lot or to determine variations in the composition within the heat.
6.2.2Acceptance or rejection of a heat or lot of material may be made by the purchar on the basis of this check analysis.
6.3Methods and practices relating to chemical analysis required by this specification shall be in accordance with Test Methods,Practices,and Terminology A751.
7.Metallurgical Requirements
7.1The material shall contain no delta ferrite,chi,or sigma phas when it is examined metallographically at1003mag-nification in accordance with Practice E407.
7.2The microcleanliness of the steel as determined by Method A of Test Methods E45,except using Plate I-r,on reprentative billet or bar samples from the heat shall not exceed the following:
Inclusion
Type
A
(Sulfide)
B
(Alumina)
C
(Silicate)
D
(Globular Ox-
ides)
Thin 1.5 1.5 1.5 1.5 Heavy 1.0 1.0 1.0 1.0
TABLE1Mechanical Requirements,Wire and Bar
Condition Diameter or Thickness,in.(mm)
Ultimate Tensile
英语比较级和最高级的用法归纳
Strength,min,psi
(MPa)
Yield Strength(0.2%
offt),min,psi(MPa)
Elongation A in
4D or4W,
min,%
Brinell B
Hardness,max,
HB
Hot-worked C all (250)
Annealed0.063and over(1.60)71000(490)27500(
Cold-worked0.063to1.500(1.60to38.1)125000(860)100000(
Extra-hard0.063to0.250(1.60to6.35)196000(1350).........
A4D=43diameter;4W=43width.Alternatively,a gage length corresponding to ISO6892may be ud when agreed upon between supplier and purchar. B29-kN(3000-kgf)load.
C Typically supplied as hot-rolled bar for forging applications.
TABLE2Mechanical Requirements,Fine Wire A
Condition B Diameter,in.(mm)Ultimate C Tensile Strength,psi
(MPa)
Elongation in10in.(254
mm),min,%
Cold-drawn under0.063
(1.60)125000to150000
(860to1035)
5
A Annealedfine wire requirements are covered in Specification F1350.
B Recommended crosshead speed for cold-drawnfine wire is5in./min(2.0mm/s).
C Cold-drawn wire may be ordered to tensile strengths up to300000psi(2070MPa)with lower elongation as determined by customer and supplier.
TABLE3Chemical Requirements,Heat Analysis Element Composition,%
Carbon0.030max
Mangane 2.00max
Phosphorous0.025max
Sulfur0.010max
Silicon0.75max
Chromium A17.00to19.00
Nickel13.00to15.00
黄奕离婚Molybdenum A 2.25to3.00
Nitrogen0.10max
Copper0.50max
Iron B balance
祝福家庭的祝福语A The compositional requirement shall meet the following:
%Cr+3.33%Mo$26.0.
B Approximately equal to the difference between100%and the sum percentage of the other specified elements.The percentage iron content by difference is not required to be reported.
TABLE4Product Analysis Tolerance A
Element
Tolerance Under the
Minimum or Over the
Maximum Limit B Carbon0.005禁毒知识题库
Mangane0.04
Phosphorous0.005
Sulfur0.005
Silicon0.05
Chromium0.20
Nickel0.15
Molybdenum0.10
Nitrogen0.01
Copper0.03
A Refer to Specification A555/A555M.
B Under minimum limit not applicable for elements where only a minimum percentage is
indicated.
8.Mechanical Properties
8.1Material shall conform to the appropriate requirements as to mechanical properties specified in Table1and Table2. The level of mechanical properties for material in conditions other than tho included in Table1and Table2,shall be specified in the purcha order.
8.1.1Bar and wire in the cold-worked condition can be supplied to a higher tensile strength and corresponding lower elongation as specified on the purcha order.
8.1.2Fine wire in the cold-drawn condition can be supplied to a higher tensile strength and corresponding lower elongation as specified on the purcha order.
8.2Specimens for tension tests shall be machined and tested in accordance with Test Methods E8and E8M.
8.3Brinell hardness number(HB)is the preferred method of reporting the hardness of hot-worked material.
8.4When desired,Rockwell hardness,B scale(HRB), Rockwell hardness,C scale(HRC),or other hardness limits may be specified.Hardness determination on cold-worked material shall be made on a product cross-ction,midway between the center and surface,if cross-ction size is ad-equate.
9.Special Tests
9.1The steel shall be capable of passing the intergranular corrosion susceptibility test in accordance with Practice E of Practices A262.
9.1.1Samples in the hot-worked condition shall be annealed prior to Practice E of Practices A262,nsitization heat treatment.
9.2The grain size shall befive orfiner when tested in accordance with Test Methods E112.
专升本学费多少9.2.1It is preferred that samples for grain size determination be lected after the hot working operation or after thefinal annealing operation prior to thefinal cold working operation.
9.2.2If samples are lected after afinal cold working operation,specimens shall be tested in accordance with Test Methods E112or as agreed to between suppplier and pur-char.
9.3Finished round bar greater than0.250in.(6.35mm) diameter shall be inspected using ultrasonic or equivalent test methods.Billet shall also be ultrasonically tested prior to being hot rolled and should be free of internal defects.Acceptance criteria shall be agreed to between pruchar and supplier. 9.4Any other special requirements shall be specified on the purcha order.
10.Certification
10.1The manufacturer’s certification that the material was manufactured and tested in accordance with this specification together with a report of the test results,shall be furnished at the time of shipment.
11.Quality Program Requirements
11.1The producer shall maintain a quality program,such as defined in ASQ C1.
11.2The manufacturer of surgical implants may audit the producer’s quality program for conformance to the intent of ASQ C1,or other recognized program.
动漫广告12.Keywords
鸡血石印12.1metals(for surgical implants);stainless steel;surgical applications wire;surgical implants
APPENDIXES (Nonmandatory Information) X1.RATIONALE
X1.1The primary reason for this specification is to char-acterize composition and properties to ensure consistency in the starting material ud directly,or as modified by forging,in the manufacturing of medical devices.
X1.2This low carbon alloy is lected to provide an extra measure of assurance that the material will be free from susceptibility to intergranular corrosion.
X1.3There is a general connsus that a homogeneous metallurgical structure will be superior with respect to corro-sion and fatigue resistance.Bad upon this,metallurgical requirements includefine-grained austenitic structure free of ferrite,with low micro-inclusion content,and capability of passing an intergranular corrosion susceptibility test.
X1.4Acceptable metal conditions include hot-worked, annealed,and all cold-worked conditions,the choice dependent upon the implant design and application.
N OTE X1.1—Exposure to temperatures above800°F(425°C)during fabrication may impair corrosion resistance unless such exposure is followed by a solution annealing treatment.
X1.5Upper composition limits for nickel and lower com-position limits for molybdenum have been changed in order to meet the latest requirements specified in ISO5832–1,Compo-sition D.
X1.6A maximum nitrogen limit was previously added in accordance with the specified element requirements of similar austenitic stainless steels standardized by ASTM.
X1.7The maximum copper value is considered a practical limit bad on a statistical evaluation of commercially avail-able material.Published information has shown no adver effect for compositions containing up to1.0%copper content. X1.8The nickel range had previously been incread
to
ensure that compositions melted to the upper end of the molybdenum range would be free of delta ferrite.
X1.9The title has been changed;the high carbon compo-sition previously identified as Grade1has been deleted, product analysis tolerance limits have been included,UNS designation has been added,annealedfine wire was removed from Table2,cold-drawnfine wire requirements were revid in Table2,and Test Methods E8and E8M were added.
X1.10The mechanical requirements and size ranges have been changed,the pitting resistance equivalent(PRE)and extra hard condition have been added,ISO tension test gage length requirements may be ud when agreed to between supplier and purchar,and X2.2biocompatibility information has been added to coincide with ISO requirements.
X1.11The pitting resistance equivalent(PRE)has been reidentified as a compositional requirement,free ferrite has been changed to delta ferrite,and grain size determination for cold-worked samples was changed to meet Test Methods E112 or as agreed to between supplier and purchar.
X1.12ISO standards are listed for reference only.Although ISO standards listed in Section2are similar to the correspond-ing ASTM standards,they may not be identical.U of an ISO standard in addition to or instead of a preferred ASTM standard may be negotiated between the purchar and supplier.
X1.13Molybdenum-enriched chi and sigma intermetallic compounds must not be prent in the microstructure becau of reduced autenitic corrosion resistance and possible em-brittlement effects.
X1.14Delta ferrite is a magnetic pha that must be abnt in order to provide a completely nonmagnetic microstructure that will not cau torque,displacement,or heating in a Magnetic Resonance Imaging(MRI)environment.
X2.BIOCOMPATIBILITY
X2.1The material composition covered by this specifica-tion has been employed successfully in human implant appli-cations in contact with soft tissue and bone for over a decade. Due to the well characterized level of local biological respon established by this material,it has been ud as a control material in Practice F981.
X2.2No known surgical implant material has ever been shown to be completely free of adver reactions in the human body.However,long term clinical experience has shown an acceptable level of biological respon can be expected,if the material is ud in appropriate applications.
SUMMARY OF CHANGES
Committee F04has identified the location of lected changes to this standard since the last issue(F138–00) that may impact the u of this standard.(Approved June10,2003.)
(1)Paragraph7.1specifies that chi and sigma phas must not be prent in the microstructure when examined at1003 magnification.
(2)X1.12reprents information standardized by Subcommit-tee F04.12.(3)X1.13and X1.14were added for information purpos.
(4)Practice E407was added to the Referenced Documents ction.
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are entirely their own responsibility.
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