1、 AMSReanC: N/A activated afd acquisitionter 25 Noves. DEPARTMSTANDATEMPER Ember 2008 aENT OF DERD PRACTTCH INSPEnd may be uFENSE ICE CTION sed for newMIL-STD-825 NovembSUPERSEMIL-STD-8w/Change 17 July 200AMETRIand existin67C (USAFer 2008 DES 67B 1 8 REA: NDTIICg designs ) Provided by IHSNot for Resa
2、leNo reproduction or networking permitted without license from IHS-,-,-FOREWORD 1. This military standard is approved for use by 309MXSG/MXRL, Department of the Air Force, and is available for use by all departments and agencies of the Department of Defense. 2. This standard provides guidance on the
3、 processes for the grinding of chrome plated steel and steel parts for the Air Force repair, acquisition, and manufacture of parts and/or spare parts on the landing gear of all military aircraft. 3. Beneficial comments, recommendations, additions, deletions, and any pertinent data, which may be of u
4、se in improving this document, should be addressed to 309MXSG/MXRIL, Hill AFB, UT 84056-2609 or 309MXSG/MXRLhill.af.mil. Since contact information can change, you may want to verify the currency of this address information using the ASSIST Online database at http:/assist.daps.dla.mil. ii Provided by
5、 IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-CONTENTS PARAGRAPHS PAGE FOREWORD i 1. SCOPE 1 1.1 Scope 1.2 Groups 1 1.2.1 Case hardened steels 1.3 Purpose 1 1.3.1 Localized discontinuous carburization 1 1.3.2 De-carburized surface layer 1 2. APPLICABLE DOCUME
6、NTS 1 2.1 General 1 2.2 Government documents 2 2.2.1 Specifications, standards, handbooks, and commercial item descriptions 2 2.2.2 Other Government documents 2.3 Non-Government publications 2 2.4 Order of precedence 3 3. DEFINITIONS (Not applicable) 3 4. GENERAL REQUIREMENTS 3 4.1 Materials and equ
7、ipment 3 4.1.1 Materials 4.1.2 Equipment 3 4.1.3 Company process specifications 4 4.1.3.1 Standardization 4.2 Responsibility for inspection 4 4.3 Manufacturing process cycle 4.4 Record of inspection 5 4.5 Qualification and certification 4.5.1 Initial qualification 5 4.5.2 Re-certification 4.5.3 Re-e
8、xamine for qualification 5 4.5.4 Certification 5 5. DETAILED REQUIREMENTS 5 5.1 Process 5.2 Cleaning 5 5.3 Solution concentrations Table I 6 Table II 7 Table III 8 iii Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-CONTENTS PARAGRAPHS PAGE Table IV
9、9 5.4 Acid etch visual inspection 10 5.4.1 Rejection criterion 5.4.2 Acceptable color 10 5.5 Baking 5.6 In-service quality checks 10 5.6.1 Acid concentrations 5.6.2 Sensitivity 10 5.6.3 Magnetic particle inspection 5.6.4 Records 1 5.7 Re-etching 5.8 Seeking competent advice 1 5.9 Hardness testing 5.
10、10 Rework/salvage 1 5.11 Acid etch removal 5.12 Marking 1 5.13 Toxic and hazardous substances 6. NOTES 12 6.1 Intended use 6.2 Subject term (key word) listing 12 6.3 Changes from previous issue CONCLUDING MATERIALS 12 iv Provided by IHSNot for ResaleNo reproduction or networking permitted without li
11、cense from IHS-,-,-MIL-STD-867B 1 1. SCOPE 1.1 Scope. This standard establishes requirements and test for performing temper etch inspection of carburized steels and tool and low alloy steels, which are heat treated above 1.24 x 109Pascal (PA) (1.26 x 102 kilogram force/square millimeter (Kgf/mm2) or
12、 1.8 x 105 pound force/square inch (psi). This standard applies to aircraft and missiles structural and propulsion system components when MIL-HDBK-6870 (for guidance only) and/or MIL-STD-866 are reference documents in the solicitation or contract. 1.2 Groups. Temper-etch inspection is typically perf
13、ormed on steels from the following groups: a. Group A: Low alloy steels: SAE 52100 SAE 4140 SAE 4330 SAE 4340 300 M D6AC 440C Carburizing Steels: SAE 4620 9310 AMS 6260 b. Group B: Tool Steels: H-11 M-50 M-2 H-13 NOTE: The alloys listed are examples. The process is applicable to any alloy that would
14、 be considered part of each group. 1.2.1 Case hardened steels. The standard is not applicable to surface hardened steels produced by nitriding or carbonitriding. 1.3 Purpose. This inspection is to be conducted to determine if heat has been induced in a component, subsequent to final heat treat, by m
15、achining, grinding, or other means, which will adversely affect the required properties of that component. 1.3.1 Localized discontinuous carburization. To detect localized discontinuous carburization due to an inadvertent carburize stop-off and to determine the presence of or lack of total carburiza
16、tion in specified locations. 1.3.2 De-carburized surface layer. To detect a de-carburized surface layer. 2. APPLICABLE DOCUMENTS 2.1 General. The documents listed in this section are specified in sections 3, 4 and 5 of this standard. This section does not include documents cited in other sections of
17、 this standard or recommended for additional information or as examples. While every effort has been made to ensure the completeness of this list, document users are Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-STD-867C 2 cautioned that they m
18、ust meet all specified requirements of documents cited in sections 3, 4, and 5 of this standard, whether or not they are listed. 2.2 Government documents. 2.2.1 Specifications, standards, handbooks, and commercial item descriptions. The following specifications, standards, handbooks, and commercial
19、item descriptions form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract. DEPARTMENT OF DEFENSE SPECIFICATIONS MIL-PRF-16173 Corrosion Preventive Compound Solvent Cutback, Cold Application
20、 (Copies of these documents are available online at http:/assist.daps.dla.mil or from the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 19111-5094.) 2.2.2 Other Government documents, drawings, and publications. The following other Government documents, drawin
21、gs, and publications form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract. COMMERICAL ITEM DESCRIPTIONS A-A-59105 Nitric Acid, Technical A-A-59281 Cleaning Compound, Solvent Mixtures (Co
22、pies of these documents are available online at http:/assist.daps.dla.mil or from the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 19111-5091.) CODE OF FEDERAL REGULATIONS (CFR) 27CFR 21.35 Formula 3-A (Copies of this document are available online at www.acc
23、ess.gpo.gov/nara/cfr or from the Superintendent of Documents, U.S. Printing Office, North Capitol such as, smear or smutty finishes. Aluminum oxide or garnet grit blast between re-etch is recommended. 5.8 Seeking competent advice. A metallurgist shall be consulted in instances where the results of t
24、he etching appear inconclusive and where further interpretation is required. 5.9 Hardness testing. If part size and configuration permits, hardness testing in accordance with ASTM E18 using 15/N Rockwell test equipment may be used as an evaluation of hardness in moderate to heavy over-tempered areas
25、. A reduction of two (2) Rockwell 15/N points or more from the areas directly adjacent to the burn is indicative of an over-stressed and crack susceptive condition and should not be accepted in high stress areas. In lieu of Rockwell 15/N hardness testing, 1000 gram maximum load micro-hardness testin
26、g may be employed. 5.10 Rework/salvage. If sufficient stock remains for rework within the specified dimensions, the parts may be reworked to remove indications of over-tempering or re-hardening. Parts subjected to this rework shall be re-acid etch inspected. 5.11 Acid etch removal. Discoloration fro
27、m the acid etch inspection process shall be acceptable unless otherwise specified by the drawing or customer requirements. The discoloration may be removed by polishing, honing, vapor grit blasting, or electrolytic alkaline cleaning methods providing dimensional changes do not exceed drawing require
28、ments and customer approval is obtained. 5.12 Marking. Parts which have met the etch inspection requirements shall be marked in accordance with the applicable drawing, specification, purchase order or contract. Marking, as specified, shall be applied in such manner and location as to be harmless to
29、the part and which will preclude removal, smearing, or obliterating by subsequent handling. A symbol N, NE or AE may be used. Provision shall be made to identify the individual inspector accomplishing the temper etch inspection along with the date and time the inspection was performed. In lieu of ma
30、rking the part and as allowed by contract, an approved process control document (traveler, work control document, etc.) that identifies the specific part by part number and serial number may be annotated. 5.13 Toxic and hazardous substances. This document specifies use of certain materials which hav
31、e been listed in subpart Z, 29 CFR 1910 (OSHA Standards), “Toxic and Hazardous Substances.” Personnel exposure to these materials must be limited to the values specified in applicable portions of 29 CFR 1910.1000. Provided by IHSNot for ResaleNo reproduction or networking permitted without license f
32、rom IHS-,-,-MIL-STD-867C 12 6. NOTES (This section contains information of a general or explanatory nature that may be helpful, but is not mandatory.) 6.1 Intended use. This standard provides the step by step process and procedures for temper etch to be used during repair process and acquisition of
33、spares for the landing gear of all military aircraft. 6.2 Subject term (key word) listing. Equipment Materials Process 6.3 Changes from previous issue. The margins of this standard are marked with vertical lines to indicate modifications generated by this change. This was done as a convenience only
34、and the Government assumes no liability whatsoever for an inaccuracies in these notations. Bidders and contractors are cautioned to evaluate the requirements of this document based on the entire content irrespective of the marginal notations. CONCLUDING MATERIAL Custodian: Preparing Activity: Air Fo
35、rce 70 Air Force 70 (Project: NDTI-2009-002) NOTE: The activities listed above were interested in this document as of the date of this document. Since organizations and responsibilities can change, you should verify the currency of the information above using ASSIST Online database at http:/assist.daps.dla.mil. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
