Reklama

Reklama

Nejsledovanější žánry / typy / původy

  • Drama
  • Komedie
  • Akční
  • Telenovela
  • Animovaný

O mně

TABLE OF CONTENTS

1. SCOPE .......................................................................................................................................... 3

2. REFERENCES.............................................................................................................................. 3

3. GENERAL REQUIREMENTS .................................................................................................. 3

4. COATING THICKNESS............................................................................................................ 4

4.1 Thickness Control................................................................................................................... 4

4.2 Coating thickness classifications ......................................................................................... 4

5. REQUIREMENTS RELATING TO SPECIFIC PRODUCT FORMS ................................. 5

5.1 Fasteners .................................................................................................................................. 5

5.1.1 Baking Requirements ..................................................................................................... 5

5.1.2 Baking Treatment ........................................................................................................... 5

5.1.3 Hydrogen Embrittlement Testing ................................................................................ 5

5.1.3.1 Hydrogen Embrittlement Test Lot Size ................................................................. 6

5.1.3.2 Hydrogen Embrittlement Test Specimens ............................................................ 6

5.1.3.3 Test Fixture Requirements ...................................................................................... 6

5.1.4 Hydrogen Embrittlement Test Procedure ................................................................... 7

5.1.5 Certification ..................................................................................................................... 7

5.2 Springs ..................................................................................................................................... 8

5.2.1 Baking Requirements ..................................................................................................... 8

5.2.2 Baking Treatment ........................................................................................................... 8

5.2.3 Hydrogen Embrittlement Testing ................................................................................ 8

5.2.3.1 Hydrogen Embrittlement Test Lot Size ................................................................. 8

5.2.3.2 Hydrogen Embrittlement Test Specimens ............................................................ 8

5.2.3.3 Hydrogen Embrittlement Test Procedure............................................................. 8

5.2.3.4 Certification ............................................................................................................... 9

6. CHROMATE CONVERSION COATINGS ......................................................................... 10

 

APPENDIX A: DETERMINING THE HYDROGEN EMBRITTLEMENT PROOF TORQUE FOR PLATED FASTENERS .............................................................................................................. 11

A1. PROOF TEST LOAD ............................................................................................................. 11

A2. HYDROGEN EMBRITTLEMENT PROOF TORQUE .................................................... 11

A3. COEFFICIENT OF FRICTION ............................................................................................ 13

A4. ADDITIONAL FASTENER PARAMETERS .................................................................... 13

A4.1 Externally-threaded fasteners......................................................................................... 13

A4.2 Nut Parameters ................................................................................................................. 14

7. RELEASE/REVISION RECORD ............................................................................................ 16

 

Finishing Specification FFS 2B4 Revision G Printed: 6-Aug-13 Confidential / Do Not Reproduce Page 3 of 18

 

1. SCOPE This specification covers the requirements for all electrodeposited zinc coatings applied on iron and steel articles for the prevention of corrosion. The specification governs coatings applied by Fisher Manufacturing sites or by outside sources.

 

2. REFERENCES (a) ASTM B183 - Practice for Preparation of Low-Carbon Steel for Electroplating (b) ASTM B242 - Practice for Preparation of High-Carbon Steel for Electroplating (c) ASTM B320 - Practice for Preparation of Iron Castings for Electroplating (d) ASTM B322 - Practice for Cleaning Metals Prior to Electroplating (e) ASTM B374 - Standard Definitions of Terms Relating to Electroplating (f) ASTM B487 - Method for Measurement of Metal and Oxide Coating Thicknesses by Microscopical Examination of a Cross Section (g) ASTM B499 - Method for Measurement of Coating Thicknesses by the Magnetic Method: Non-magnetic Coatings on Magnetic Basis Metals (h) ASTM B504 - Method for Measurement of Thickness of Metallic Coatings by the Coulometric Method (i) ASTM B567 - Method for Measurement of Coating Thickness by the Beta Backscatter Method (j) ASTM B568 - Method for Measurement of Coating Thickness by X-Ray Spectrometry (k) ASTM B633 - Electrodeposited Coatings of Zinc on Iron and Steel (l) MIL-STD-1312 - Fastener Tests, Methods

 

3. GENERAL REQUIREMENTS

3.1 The coating shall be essentially pure zinc produced by electrodeposition.

3.2 Defects in the surface of the basis metal may adversely affect the appearance and performance of the electrodeposited coating. The supplier is responsible for defects due to basis metal surface discontinuities only if he is the prime contractor for the parts and if the design specifications for the parts contain appropriate limitations relating to such basis metal conditions.

3.3 Proper pretreatment practices for the particular material being coated shall be utilized to ensure that satisfactory adhesion, corrosion resistance, and appearance are attained. Finishing Specification FFS 2B4 Revision G Printed: 6-Aug-13 Confidential / Do Not Reproduce Page 4 of 18

 

4.COATING THICKNESS

4.1 Thickness Control The thickness of the coating to be applied shall be controlled as follows: (a) If a dimensional coating thickness or a coating thickness classification is specified on the purchase order or shop ticket, it shall be considered the controlling value, and shall override coating thickness specifications listed in other documentation (such as on drawings). (b) If a dimensional coating thickness or a coating thickness classification is not specified on the purchase order or shop ticket, the coating thickness shall be as required on the part drawing. If the coating thickness is not specified on the purchase order, the shop ticket, or the drawing, a coating meeting thickness classification I shall be provided. (c) Significant surfaces (areas where thickness requirements to be met) shall be designated on part drawings or by the provision of a suitably marked sample. (d) It shall be recognized that there are limitations to how uniformly a complex article can be coated using electrodeposition techniques. When complex articles are to be coated, the supplier and purchaser shall jointly determine the thickness requirements for the various surfaces on the part. The coating thickness requirements shall be documented on the part drawing. (e) In the case of parts ordered per supplier's standards, vendor catalog numbers, etc., the coating thickness shall be that which is normally supplied by that vendor for that type of product.

 

4.2 Coating thickness classifications 4.2.1 The following coating thickness classifications may be specified on the purchase order or shop ticket: Classification Required Coating Thickness I 0.00020" ± 0.00005" (0.0051mm ± .0013mm) thick II 0.0003" ± 0.00005" (0.0076mm ± .0013mm) thick III 0.0006" ± 0.0001" (0.0155mm ± 0.0025mm) thick Finishing Specification FFS 2B4 Revision G Printed: 6-Aug-13 Confidential / Do Not Reproduce Page 5 of 18 4.2.2 Classification I and II coatings are generally specified for threaded parts, whereas Classification III coatings are utilized for non-threaded parts which require a higher degree of protection from corrosion.

4.3 Dimensional coating thickness requirements may be utilized to specify coating thicknesses different than those covered by the coating thickness classifications.

4.4 The coating thickness shall be determined by ASTM Method B487, B499, B504, B567, B568, MIL-STD-1312 Test 12, or some other reliable, reproducible test method.

 

5. REQUIREMENTS RELATING TO SPECIFIC PRODUCT FORMS

5.1 Fasteners

5.1.1 Baking Requirements All fasteners which are above HRC 32 or which have been case hardened shall be baked within 4 hours after plating to prevent hydrogen embrittlement. The following is a partial listing of fasteners which must be baked: (a) ASTM A574 (or ASME SA574) (b) SAE J429 Grade 8 (c) All ASME SA193 (or ASTM A193) Grade B7 and B16, and ASME SA320 (or ASTM A320) grade L7, regardless of actual hardness level (due to critical nature of applications) (d) All ASME SA194 (or ASTM A194) Grades 2H, 4, 7, and 16, regardless of actual hardness level (due to critical nature of applications) Note: Baking, hydrogen embrittlement testing, and certification are not required for SAE J429 Grade 5 externally-threaded fasteners and SAE J995 Grade 2, 5, and 8 nuts.

5.1.2 Baking Treatment The baking treatment shall consist of heating the fasteners to 375-450°F (191-232°C) for 4 hours minimum at temperature, except for ASTM A574 fasteners, which shall be baked for 24 hours minimum at temperature. The temperature and time at temperature shall be based upon one or more thermocouple(s) or other temperature measurement device(s) placed in the center of the furnace load. At a minimum, furnace controls shall be calibrated and checked on a quarterly basis. 5.1.3 Hydrogen Embrittlement Testing This section describes the post-baking test procedure used to assure that fasteners which are susceptible to hydrogen embrittlement, as described in paragraph5.1.1, have been adequately baked. Finishing Specification FFS 2B4 Revision G Printed: 6-Aug-13 Confidential / Do Not Reproduce Page 6 of 18

5.1.3.1 Hydrogen Embrittlement Test Lot Size For the purpose of hydrogen embrittlement testing, a lot shall consist of all identical parts which have been plated using the same process, and which have been baked in a single batch. In other words, identical parts which have been plated in one large batch, but heat treated in several small batches, would comprise several lots. Identical parts which were plated in several small batches (using the same process), but heat treated in one large batch, would comprise one lot.

5.1.3.2 Hydrogen Embrittlement Test Specimens Testing may be performed on either: (a) Actual fasteners from the lots, or (b) Representative coupon specimens of ASTM A574 socket head cap screws. The representative specimens must be plated using the same process as the represented fasteners, and must be baked in the same batch with the represented fasteners. Representative coupon specimens may not receive any thermal treatment between plating and being baked with the actual fasteners. Note: Representative specimens may be used to represent multiple lots if those lots are all heat treated in one batch. The intent of option (b) is to allow the testing of small, common fasteners (for example, 3/8-16 X 1-1/2 socket head cap screws) in lieu of larger, difficult-to-test, or non-standard fasteners. This method is always recommended for nuts and other internally threaded fasteners. If actual fasteners from the lot will be used for testing, 8 specimens shall be tested, unless the lot contains less than 8 parts, in which case all of the parts shall be tested. If representative coupon specimens will be used for testing, 8 specimens shall be tested. Note: Representative coupon specimens shall not be considered part of the lot when determining lot size.

5.1.3.3 Test Fixture Requirements (a) If an externally-threaded fastener (cap screw, bolt, stud, etc.) is being evaluated, testing shall be conducted using either a tapped-hole fixture or a free-running nut. In either case, the thread length shall be at least 1.5 times the nominal fastener size. Spacers may be used to ensure full contact of the fastener head. (b) If an internally-threaded fastener (nut) is being evaluated, testing shall be conducted using a cap screw, stud, or bolt. Spacers may be used to ensure full contact of the fastener head. Finishing Specification FFS 2B4 Revision G Printed: 6-Aug-13 Confidential / Do Not Reproduce Page 7 of 18

5.1.4 Hydrogen Embrittlement Test Procedure (a) Select a lubricant to use during the test to reduce friction variation. Several lubricants and their associated friction coefficients are included in Appendix A, paragraph A3. Any lubricant may be used; however, if a lubricant other those listed in paragraph A3 is used, the resulting coefficient of friction must be known. The lubricant shall be applied to the threads and all mating surfaces between the fastener being tested and the other components of the test assembly. (b) Determine the hydrogen embrittlement proof torque per the procedure outlined in Appendix A. Example calculated torque values are provided in paragraph A2.1 in Appendix A. (c) Apply lubricant to the threads and all mating surfaces between the fastener being tested and the other components of the test assembly. (d) Assemble the fastener/test assembly and torque the fastener to the calculated hydrogen embrittlement proof torque. (e) Wait 24 hours. (f) Re-torque to the hydrogen embrittlement proof torque. (g) If the fastener has not fractured, remove from the fixture, clean, and inspect for cracks. (h) Fasteners which have fractured or exhibit visible cracks at a magnification of 5X shall be considered to have failed. (i) Failure of any specimens constitutes rejection of the entire lot. Lots which are rejected may be dispositioned by either: (1) Scrapping the lot, or (2) Re-baking and re-testing the lot. If the re-test fails, the lot shall be scrapped.

5.1.5 Certification Shipment of each lot shall include: (a) A heat treat chart demonstrating that the lot has received the required thermal treatment. The chart shall include the part number and quantity of parts comprising the lot. A certification stating the results of the hydrogen embrittlement testing and adherence to this specification. Finishing Specification FFS 2B4 Revision G Printed: 6-Aug-13 Confidential / Do Not Reproduce Page 8 of 18 5.2 Springs

5.2.1 Baking Requirements All springs that are electroplated shall be baked within 4 hours after the electroplating treatment is completed to prevent hydrogen embrittlement. Note: With the express permission of Product Engineering, mechanically plated springs are an acceptable alternative to electroplated springs, and need not be baked or tested for hydrogen embrittlement.

5.2.2 Baking Treatment The baking treatment shall consist of heating the springs to 375-450°F (191-232°C) for 4 hours minimum at temperature. The temperature and time at temperature shall be based upon one or more thermocouple(s) or other temperature measurement device(s) placed in the center of the furnace load. At a minimum, furnace controls shall be calibrated and checked on a quarterly basis.

5.2.3 Hydrogen Embrittlement Testing This section describes the post-baking test procedure used to ensure that springs have been adequately baked.

5.2.3.1 Hydrogen Embrittlement Test Lot Size A lot consists of identical parts which have been plated using the same process and which have been baked in a single batch. In other words, identical parts which have been plated in one large batch, but baked in several small batches, would comprise several lots. Identical parts which were plated in several small batches (using the same process), and baked in one large batch would comprise one lot.

5.2.3.2 Hydrogen Embrittlement Test Specimens Testing shall be performed on actual springs. 8 specimens shall be tested unless the lot contains less than 8 parts, in which case the entire lot shall be tested.

5.2.3.3 Hydrogen Embrittlement Test Procedure (a) Compress the springs to their minimum working length (stretched to their maximum working length for extension springs). (b) The springs shall remain in this compressed (or extended) state for 24 hours. (c) Unload the springs and examine for any evidence of cracking or other failures. Fasteners which have fractured or exhibit visible cracks shall be considered to have failed. Finishing Specification FFS 2B4 Revision G Printed: 6-Aug-13 Confidential / Do Not Reproduce Page 9 of 18 (d) Failure of any specimens constitutes rejection of the entire lot. Lots which are rejected may be dispositioned by either: (1) Scrapping the lot, or (2) Re-baking and re-testing the lot. If the re-test fails, the lot shall be scrapped.

5.2.3.4 Certification Shipment of each lot shall include: (b) A heat treat chart demonstrating that the lot has received the required thermal treatment. The chart shall include the part number and quantity of parts comprising the lot. (c) A certification stating the results of the hydrogen embrittlement testing and adherence to this specification. Finishing Specification FFS 2B4 Revision G Printed: 6-Aug-13 Confidential / Do Not Reproduce Page 10 of 18

 

6. CHROMATE CONVERSION COATINGS

6.1 Chromate conversion coating is required after application of the zinc unless otherwise specified on the purchase order, shop ticket, or drawing.

6.1.1 If a particular type of chromate conversion coating is specified on the purchase order, shop ticket, or drawing, the chromate conversion coating applied shall be as follows: Type 1 - Olive drab Type 2 - Yellow (gold) Type 3 - Clear Type 4 - Other

6.1.2 If no particular type of chromate conversion coating is specified on the purchase order, shop ticket, or drawing, any of the chromate conversion coatings listed in paragraph 6.1.1 is acceptable. It is recognized that the performance of chromate conversion coatings varies depending upon coating color. Paragraph 6.1.1 lists the chromate conversion coating types in descending order of preference.

6.2 Electroplated surfaces passivated as the result of any heating operations shall be reactivated before receiving a chromate conversion treatment. Reactivation may be accomplished by immersion of the parts in a dilute acid solution. Finishing Specification FFS 2B4 Revision G Printed: 6-Aug-13 Confidential / Do Not Reproduce Page 11 of 18

 

APPENDIX A: DETERMINING THE HYDROGEN EMBRITTLEMENT PROOF TORQUE FOR PLATED FASTENERS

A1. PROOF TEST LOAD

A1.1 In some fastener specifications (such as SAE J429 and ASTM A574), the proof test load, F, is listed explicitly. In these cases, the listed proof load shall be utilized for calculation purposes. A1.2 Where proof test loads are not specified in the fastener material specification, the proof test load shall be calculated as follows: F = 0.9 ´ Sy ´ A where, F = Proof test load, pounds Sy = Specified minimum yield strength of fastener material A = Tensile Stress Area, in2 (see paragraph A4.1.3) A1.3 In the case where a modified nut is being evaluated for hydrogen embrittlement (for example, where a portion of the thread has been removed by machining), the proof load used for testing purposes shall be decreased or increased from the load for a standard nut by an amount proportionate with the percentage of the thread which has been removed or added.

A2. HYDROGEN EMBRITTLEMENT PROOF TORQUE The hydrogen embrittlement proof torque is the torque calculated to produce 85% of the proof load in the fastener being tested. It is determined using the following formula: ( ) T = ´ F P + d + ro ri  +      0 85 12 2 2 2 . p cos m q m where: T = Proof Torque (ft-lbs) F = Axial force in bolt (lb) = Proof Load P = Pitch of the thread = 1 N N = Number of threads per inch m = Coefficient of Friction (see paragraph A.3) d = (D dm) + 2 (inches) D = Nominal bolt diameter (inches) dm = Minor diameter of nut thread (inches) (see paragraph A4.2.1) q = ½ the thread angle (30° for a 60° thread) Finishing Specification FFS 2B4 Revision G Printed: 6-Aug-13 Confidential / Do Not Reproduce Page 12 of 18 ro = radius at the outer edge of nut or bolt head contact face (inches) (see paragraph

A4.1 for bolts/cap screws, paragraph

A4.2 for nuts) ri = radius at inner edge of nut or bolt head contact face (inches) (see paragraph

A4.1 for bolts/cap screws, paragraph A4.2 for nuts) Note: The values ro and ri are associated with the item which is to be turned while the test assembly is being torqued. For instance, if a bolt will be held in a fixture and a nut will be torqued against a spacer to provide the load, then the ro and ri values for the nut should be used. If the bolt will be torqued into a drilled and tapped plate, the ro and ri for the bolt head should be used. A2.1 Example Calculated Torque Values The following table provides hydrogen embrittlement proof torque values for several different sizes of ASTM A574 cap screws. The values provided assume the fasteners will be installed in a tapped plate using Lubriplate MAG-1 lubricant. Fastener Size: 1/4-20 5/16-18 3/8-16 1/2-13 F (Proof test load, from ASTM A574) 4450 7340 10800 19900 N (Number of threads per inch) 20 18 16 13 P (Thread pitch, calculated per A2) 0.0500 0.0556 0.0625 0.0769 m (Friction coefficient, from A3) 0.132 0.132 0.132 0.132 D (Nominal fastener diameter) 0.2500 0.3125 0.3750 0.5000 dm (Nut thread minor diameter, from A4.2.1) 0.1959 0.2524 0.3073 0.4167 d (Calculated per A2) 0.2229 0.2824 0.3412 0.4584 W (Nominal head diameter, calculated per A4.1.2) 0.3750 0.4688 0.5625 0.7500 ro (Calculated per A4.1.2) 0.1719 0.2188 0.2656 0.3594 ri (Calculated per A4.1.2) 0.1406 0.1719 0.2031 0.2656 T (Hydrogen Embrittlement Proof Torque, Ft-Lbs) 14.4 29.2 51.2 125 Finishing Specification FFS 2B4 Revision G Printed: 6-Aug-13 Confidential / Do Not Reproduce Page 13 of 18 A3.

 

COEFFICIENT OF FRICTION The coefficient of friction shall be selected per the following table based upon the lubricant utilized. If a lubricant other than one of these is utilized, it is the responsibility of the supplier to determine the appropriate friction coefficient. The lubricant shall be applied to the threads and between the bolt, nut, and the bolted member. Lubricant m Lubriplate MAG-1 0.132 Nickel Never Seez 0.125 Molykote 321R 0.100 A4. ADDITIONAL FASTENER PARAMETERS The following sections all assume that the fastener being tested is an ASME/ANSI Unified Inch 60° screw thread. For metric and other non-ANSI threads, consult the appropriate standards for these fastener parameters. In all of the following paragraphs, the following constants apply: D = Nominal diameter of the bolt, inches N = number of threads per inch A4.1 Externally-threaded fasteners A4.1.1 Standard hex head cap screws Width across flats (inches), W: W = 1 500D + 0 062 for inch size 1 4 . . , W = 1 500D for to inch size 5 16 . , 3 then: ( ) r W o = - 0 03125 2 . ( ) r D i = + 0 03125 2 . Finishing Specification FFS 2B4 Revision G Printed: 6-Aug-13 Confidential / Do Not Reproduce Page 14 of 18 A4.1.2 Socket head cap screws Nominal head diameter (inches), W: W = 1 500D for to inch sizes 1 4 . , 4 then: ( ) r D o = 1 500 - 0 03125 2 . . ( ) r D i = + 0 03125 2 . A4.1.3 Tensile stress area (square inches) of an externally threaded fastener Some fastener specifications list the tensile stress area of the included fasteners. If this information is not available in the material specification, the tensile stress area of the fastener can be calculated using the following equation: A D N = -       0 7854 0 9743 2 . . A4.2 Nut Parameters A4.2.1 Minor diameter (inches) of an ANSI standard nut thread d D N m = - 1.08253 A4.2.2 Standard hex nuts Width across flats (inches), W: W = 1 500D + 0 062 for inch size 1 4 . . , W = 1 500D for to inch size 5 16 1 1 2 . , then: ( ) r W o = - 0 03125 2 . Finishing Specification FFS 2B4 Revision G Printed: 6-Aug-13 Confidential / Do Not Reproduce Page 15 of 18 ( ) r D i = + 0 03125 2 . A4.2.3 Heavy hex nuts Width across flats (inches), W: W = 1 500D + 0 125 for to inch sizes 1 4 . . , 4 then: ( ) r W o = - 0 03125 2 . ( ) r D i = + 0 03125 2 . Finishing Specification FFS 2B4 Revision G Printed: 6-Aug-13 Confidential / Do Not Reproduce Page 16 of 18 7. RELEASE/REVISION RECORD Release/Revision: A Date: 5 April 1990 Written by: Don Bush Approved: Neal Rinehart Date Approved: 5 April 1990 Owner: Don Bush Department: Engineering, Marshalltown File Name: F02B04_*.doc Revision: B Date Revised: 5 April 1990 Revised by: Don Bush Checked by: Marc Riveland Date Checked: 5 April 1990 ECRN: 941498 Reason: Made chromate conversion coating a requirement rather than an option. Revision: C Date Revised: 28 November 1995 Revised by: Don Bush Checked by: Marc Riveland Date Checked: 28 November 1995 ECRN: 951807 Reason: (a) Renamed old coating classification II to III (paragraph 4.2.1). (b) Added new classification II for thicker coatings on threaded parts (paragraph 4.2.1). (The changes above were made at the request of the McKinney site based upon test results which demonstrated that the new classification II coating performed much better in salt-spray testing than the existing classification I coating, but still allowed assembly of threaded components). (c) Paragraph 6.1 changed to allow specification of a particular type of chromate under FFS 2B4 requirements. Finishing Specification FFS 2B4 Revision G Printed: 6-Aug-13 Confidential / Do Not Reproduce Page 17 of 18

 

 

 

 

SCOPE:        - FFS9A1 Nitriding

                        - FFS2B4 Zinc Electroplating

 

AUDIT CRITERIA: We are going to conduct a critical to quality processes audit at FFS9A1 Nitriding subcontractor and FFS2B4 Zinc Electroplating subcontractor of Fastenal (Brno – CZ) to the requirements of Fisher technical and quality specifications, FFS & FSAC.

 

 

AUDIT DATES:       Open on:      April 3, 2014 -           09:00  a.m.               

Close on:     April 3, 2014            16:00 p.m.

 

 

AUDITORS:            

1, Nandor Liptay (EMERSON, Fisher Valves - NQA-1 & NCA-3800, ISO9001 Lead Auditor) 

2, Balazs Csak (EMERSON, Fisher Valves - Auditor)

3, Anton Vaganov (           EMERSON, Fisher Valves - Auditor Trainee)  

 

 

 

09:00 a.m. - Starting Meeting

 

 

 

QMS certification

Heat Treating facility / Plating line review

Procedure / Work Instruction / Job card

Identification and Traceability

Inspection and Test Report

 

Control of Quality Records

Control of monitoring and measuring equipment (calibration)

Nonconformity product handling

 

 

 

 16:00 p.m. - Debriefing

 

 

 

 

Ovládací panel
1 bod

Fanklub

(1)

Reklama

Reklama