FINAL REPORT

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1 PROFICIENCY TESTING PROGRAM FOR TENSILE PROPERTIES OF STEEL [PTM/MECH/10/14-15] FINAL REPORT ORGANIZED BY GLOBAL PT PROVIDER PVT. LTD., NEW DELHI PT SCHEME NAME : TENSILE PROPERTIES OF STEEL PT SCHEME CODE : PTM/MECH/10/14-15 PT REPORT NO. : TP10AD/15 DATE OF ISSUE : 12/01/2016 AUTHORISED BY : MR. UMESH GUPTA (TECHNICAL DIRECTOR) Page 1 of 22

2 PT PROVIDER DETAILS NAME & ADDRESS OF THE PROFICIENCY TESTING PROVIDER: GLOBAL PT PROVIDER PRIVATE LIMITED E-41, OKHLA INDUSTRIAL AREA, PHASE II NEW DELHI , INDIA TEL: , , COORDINATORS OF THE PROFICIENCY TESTING PROGRAM: MR. ASIM DASH PT COORDINATOR MOB: ADVISORY GROUP OF THE PROFICIENCY TESTING PROGRAM: MR. KULDEEP DHINGRA MR. SUDHIR TRIPATHI REPORT PREPARED BY REPORT CHECKED BY REPORT AUTHORISED BY MR. ASIM DASH MR. RAMTIRTH MR. UMESH GUPTA PT COORDINATOR MANAGER (QA) TECHNICAL DIRECTOR Page 2 of 22

3 CONTENTS S. No. Description Page No. 1. Cover Page 1 2. PT Provider Details 2 3. Contents 3 4. Abbreviations used 4 5. Introduction 5 6. Objectives of Proficiency Testing 5 7. Registration Procedure 6 8. PT Program Details Effective Schedule Preparation of PT Items Parameters for the PT Scheme Homogeneity Testing Distribution of PT Items Stability Testing Submission of Results Analysis of Data 6-9 DETERMINATION OF ASSIGNED VALUE PERFORMANCE EVALUATION OF PARTICIPANTS: INTERPRETATION OF THE PERFORMANCE 9. Subcontracted Activities Confidentiality in Proficiency testing Conclusion Summary of Results [Data Tables] Robust Z-Score Chart: Lab Code Vs Z Score Outlier Results References: Intimation Letter (Annexure: I) Participant Instruction Sheet (Annexure: II) Sample Receipt Form (Annexure: III) Result Sheet (Annexure: IV) Laboratory Summary Sheet (Annexure: V) Page 3 of 22

4 ABBRIVIATION USED PT NABL ISO IEC PTM PTC MECH H & S UTS YS PROFICIENCY TESTING NATIONAL ACCREDITATION BOARD FOR TESTING AND CALIBRATION LABORATORIES INTERNATIONAL ORGANISATION FOR STANDARDISATION INTERNATIONAL ELECTROTECHNICAL COMMISSION PROFICIENCY TESTING PROGRAM IN METAL PROFICIENCY TESTING COORDINATOR MECHANICAL HOMOGENEITY AND STABILITY ULTIMATE TENSILE STRENGTH YIELD STRENGTH Page 4 of 22

5 1. INTRODUCTION Proficiency Testing has become an essential aspect of laboratory practice in all areas of testing, calibration and inspection. Participation in proficiency testing schemes provides laboratories with an objective means of assessing and demonstrating the reliability of the data they are producing. One of the main uses of PT scheme is to assess laboratories ability to perform test competently. This report is summarized the results of Ultimate Tensile Strength, Yield Strength & Elongation determine the Tensile Properties of steel. The Ultimate Tensile Strength, Yield Strength & Elongation in Steel are routine analysis items for most laboratories. The function of the testing laboratories is to provide data. On the basis of this data the decision are made in the Trade and Commerce industry. Thus, the reliability of test data in the laboratories can provide quality services and practicing good quality management system. The results from Proficiency Testing Program are useful to both participating laboratories and accreditation bodies. Successful participation in a specific proficiency testing program may represent evidence of competence for that exercise. Similarly, unsuccessful performance may reflect a random departure from a laboratories normal state of competence. 2. OBJECTIVES OF PROFICIENCY TESTING The main objective of the programme was to evaluate the performance of participating laboratories in the analysis of Tensile Properties of steel by means of inter-laboratory comparison. Test results from participants are evaluated according to the statistical techniques outlined in ISO 13528:2005 Statistical methods for use in proficiency testing by inter laboratory comparisons. The z- score is used as a numerical indicator to assess individual participant s performance in the programme. Page 5 of 22

6 3. REGISTRATION PROCEDURE Participants were intimated through PTP Brochure. Participant or stakeholders interest were entertained by PTC (Verbally/by ). Interested participants were registered themselves through registration form (dully filled) for individual PT program. After getting minimum number of participants, an Intimation letter (Annexure-I) was sent to concerned participant to inform about the status of PT program. 4. PROGRAM DETAILS Two Samples (X1 & X2) of dumble Shape [Dimensions of Sample: Diameter (D1) = 10±0.07mm; Radius = 12.5±0.1mm; Minimum parallel line = 55mm; Figure - 2] were distributed to concern participants (32 participants). Participants were advised to carry out test as soon as possible after receiving samples as per standard test method (IS 1608:2005 / ISO 6892:1988). The PT sample was treated by laboratory in the same way as routine laboratory samples. Total Thirty-Two Laboratories have participated in this PT program. 4.1 EFFECTIVE PT SCHEDULE: TABLE 1: PT PROGRAM SCHEDULE S. No. PT Activities Effective Date 1. Invitation & Registration 17 th April to 4 th Nov Purchase of Raw Material 20 th July to 03 th Aug Material Verification 25 th July to 18 th Aug Sample Preparation 28 th Jul to 03 th Aug Homogeneity Testing & Evaluation 18 th Aug to 31 th Aug Sample Dispatch 10 th Oct to 4 th Nov Stability Testing 15 th Oct to 31 th Nov Result Received 10 th Nov to 19 th Nov Data Analysis 20 th Nov to 09 th Dec Draft Report 10 th Dec to 28 th Dec Final Report Generation & Distribution 29 th Dec -12 th Jan 2016 Page 6 of 22

7 Figure PREPARATION OF PT ITEMS: The EN-9 Grade material was procured in the form of hot rolled steel rod of 22mm diameter. The ultrasonic testing for complete length was done to evaluate any flaws in the rod. The end pieces of the rod (up to 1 feet) were discarded while sample preparation. The chemical composition of the end pieces from steel rod was analysed using optical emission Spectrometer & Microstructure was analysed by microscopic Analysis. 200 samples were prepared by machining the rod into dumble shape as given in Figure-2. Figure 2 (D 1 = 10±0.07 mm) Page 7 of 22

8 4.3 PARAMETERS FOR THE PT SCHEME: TABLE 2: PARAMETERS FOR THE PT SCHEME S. No. PT Parameter Test Method Suggested Range of Testing 1. ULTIMATE TENSILE STRENGTH, MPa IS 1608:2005/ISO 6892: YIELD STRENGTH, MPa IS 1608:2005/ISO 6892: ELONGATION, % IS 1608:2005/ISO 6892: HOMOGENEITY TESTING: Homogeneity Testing was subcontracted to NABL Accredited Laboratory. 36 samples were randomly selected for X-Ray Testing. 20 samples were randomly selected for testing from 36 samples. These samples were analysed for the Tensile Properties. The sample for the PT scheme was as per Figure-2. The Analysis of Variance for homogeneity test (ANOVA) & Annexure-B of ISO 13528:2005 were used for examining the homogeneity of the test material. 4.5 DISTRIBUTION OF PT ITEMS: Participating laboratories were supplied two homogeneous samples as per Figure-2 marked as X1 & X2. All the samples are verified for their dimensions as per the drawings before packaging. The samples were packed in plastic tube container to ensure that no rust formation should be there on the surface of the sample. Samples were distributed to the participant by speed post and courier. Conformation of sample receipt was ensured through the return receipt of duly filled Sample Receipt Form from each participant. Participation Instruction Sheet and Receipt Form are given in Annexure II & III respectively. 4.6 STABILITY TESTING: Stability Testing was subcontracted to NABL Accredited Laboratory. Four samples with replicates were randomly selected in the month of Oct and Nov for Tensile Properties. The stability of the PT samples was checked as per Annexure-B of ISO 13528: SUBMISSION OF RESULTS: Participants were requested to perform the test according to the Instruction Sheet (Annexure II) and to submit their laboratories test results to the accuracy specified in the result sheet (Annexure IV). Reporting of test results were to be done of each parameter. In case of laboratory does not carry out of the specified parameters then indicate the same by marking the result columns for these parameters, with cross mark. The results of the individual laboratories were received through duly filled Result Sheet format by and courier also. The original data is tabulated in (TABLE 3-5). Page 8 of 22

9 4.8 ANALYSIS OF DATA: In order to maintain the confidentiality of the participants of the PT Scheme, the individual participant laboratories were given unique Lab Code numbers in result sheet format. Robust Average is calculated from submitted results and used as assigned value as per Clause 5.6 of ISO 13528:2005. Robust Z score has been analysed as per Annexure C (Algorithm-A) of ISO 13528:2005 for each laboratory for each parameter to keep the result free from disturbances due to the extreme values. DETERMINATION OF ASSIGNED VALUE: The consensus values from the participants have been taken as the assigned value for the proficiency testing program. PERFORMANCE EVALUATION OF PARTICIPANTS: The performance of the individual laboratory was evaluated by adopting Robust Z score technique given in ISO 13528:2005, as per the following formula: Z = Where, is the test result reported by the individual laboratory is the Assigned Value & is the standard deviation of the Proficiency Assessment. INTERPRETATION OF THE PERFORMANCE: The calculated Z-scores are tabulated in the report alongside the corresponding results and the results are assessed based on their Z-Scores. The results of Z-Score are interpreted as follows. Z < 2 = Satisfactory 2 < Z < 3 = Questionable Z > 3 = Unsatisfactory An Outlier defined as any results / pair of results with an absolute Z-Score greater than 3 i.e. Z >3 or Z<- 3. The outlier criteria Z > 3 has a confidence level of about 99% i.e. there is less than 1% chance that the result is a true member of the population and it is for more likely that there is a problem with this result/ pair of result. Laboratories which have a Z-Score in the region 2 < 3 are encouraged to take a close look at their results. However the sign of the value of Z-Scores must be considered. The value > 3 indicate the both of results for pair is too high. Similarly negative (-3) indicates the results are too low. Page 9 of 22

10 5. SUBCONTRACTING ACTIVITIES The following activities have been subcontracted for this PT program as given below: Testing for Material Verification Sample Preparation Testing for Homogeneity Check Testing for Stability Check 6. CONFIDENTIALITY IN PROFICIENCY TESTING In order to maintain confidentiality of participants of the PT scheme, each participant laboratories are given unique Lab ID which is only disclosed to that participant. Participant identity, performance and report will not be disclosed to any other party without the prior permission of the participants and written authorisation. Confidentiality will be maintained at all levels. The results of the PT can be disclosed to Accreditation/Regulatory body. 7. CONCLUSION Total thirty-two nos. laboratories have participated in this PT program. All the laboratories have participated in all the three parameters i.e Ultimate tensile Strength, Yield Strength & Elongation. In performance evaluation, twenty-five laboratories out of thirty-two laboratories have Satisfactory results. Two laboratories have Questionable results. Five laboratories have Unsatisfactory results. Two results from Ultimate tensile Strength & Three results from Yield Strength have been excluded from Robust Analysis. Page 10 of 22

11 SUMMARY OF RESULTS [DATA TABLES] Page 11 of 22

12 TABLE 3: ROBUST Z-SCORE FOR ULTIMATE TENSILE STRENGTH Ultimate Tensile Strength Lab Code Reported Value (MPa) Test Method Adopted Z-Score Performance T IS 1608: Satisfactory T IS 1608: Satisfactory T IS 1608: Satisfactory T IS 1608: Satisfactory T IS 1608: Satisfactory *T ISO Unsatisfactory T ISO : Satisfactory T IS 1608:2005/ISO 6892: Satisfactory T IS 1608: Satisfactory T ISO 6892: Satisfactory T IS 1608: Satisfactory T ISO : Satisfactory T IS 1608: Satisfactory T IS 1608: Satisfactory T IS 1608: Satisfactory *T IS 1608: Unsatisfactory T IS 1608: Satisfactory T IS 1608: Satisfactory T IS 1608: Satisfactory T IS 1608: Satisfactory T ISO Satisfactory T IS 1608:2005/ISO 6892: Satisfactory T IS 1608: Satisfactory T IS 1608:2005/ISO 6892: Satisfactory T IS 1608: Satisfactory T IS 1608: Satisfactory T IS 1608: Satisfactory T IS 1608: Satisfactory T IS 1608: Satisfactory T IS 1608: Satisfactory T IS 1608: Satisfactory T IS 1608: Satisfactory Page 12 of 22

13 Total No. of Participants 32 Maximum Reported Value (MPa) Minimum Reported Value MPa) Robust Average (MPa) Standard Deviation of Proficiency Testing (σ) 9.35 *Results are not considered in Robust Z-Score Calculation. Page 13 of 22

14 TABLE 4: ROBUST Z-SCORE FOR YIELD STRENGTH Yield Strength Lab Code Reported Value (MPa) Test Method Adopted Z-Score Performance *T IS 1608: Unsatisfactory T IS 1608: Satisfactory T IS 1608: Satisfactory T IS 1608: Satisfactory T IS 1608: Satisfactory T ISO Satisfactory T ISO : Satisfactory T IS 1608:2005/ISO 6892: Satisfactory T IS 1608: Questionable T ISO 6892: Satisfactory T IS 1608: Satisfactory T ISO : Satisfactory T IS 1608: Satisfactory T IS 1608: Satisfactory T IS 1608: Satisfactory *T IS 1608: Unsatisfactory T IS 1608: Satisfactory *T IS 1608: Unsatisfactory T IS 1608: Satisfactory T IS 1608: Satisfactory T ISO Satisfactory T IS 1608:2005/ISO 6892: Satisfactory T IS 1608: Satisfactory T IS 1608:2005/ISO 6892: Satisfactory T IS 1608: Satisfactory T IS 1608: Satisfactory T IS 1608: Satisfactory T IS 1608: Satisfactory T IS 1608: Satisfactory T IS 1608: Satisfactory T IS 1608: Satisfactory T IS 1608: Satisfactory Page 14 of 22

15 Total No. of Participants 32 Maximum Reported Value (MPa) Minimum Reported Value MPa) Robust Average (MPa) Standard Deviation of Proficiency Testing (σ) *Results are not considered in Robust Z-Score Calculation. Page 15 of 22

16 TABLE 5: ROBUST Z-SCORE FOR ELONGATION Elongation Lab Code Reported Value (%) Test Method Adopted Z Score Performance T IS 1608: Satisfactory T IS 1608: Satisfactory T IS 1608: Satisfactory T IS 1608: Satisfactory T IS 1608: Satisfactory T ISO Satisfactory T ISO : Satisfactory T IS 1608:2005/ISO 6892: Questionable T IS 1608: Satisfactory T ISO 6892: Satisfactory T IS 1608: Satisfactory T ISO : Satisfactory *T IS 1608: Unsatisfactory T IS 1608: Satisfactory T IS 1608: Satisfactory T IS 1608: Satisfactory T IS 1608: Satisfactory T IS 1608: Satisfactory T IS 1608: Satisfactory T IS 1608: Satisfactory T ISO Satisfactory T IS 1608:2005/ISO 6892: Satisfactory T IS 1608: Satisfactory T IS 1608:2005/ISO 6892: Satisfactory T IS 1608: Satisfactory T IS 1608: Satisfactory T IS 1608: Satisfactory T IS 1608: Satisfactory T IS 1608: Satisfactory T IS 1608: Satisfactory T IS 1608: Satisfactory T IS 1608: Satisfactory Page 16 of 22

17 Total No. of Participants 32 Maximum Reported Value (%) 24.0 Minimum Reported Value (%) 18.2 Robust Average (%) Standard Deviation of Proficiency Testing (σ) 0.97 Page 17 of 22

18 ROBUST Z- SCORE CHART: LAB CODE VS Z-SCORE Page 18 of 22

19 Ultimate Tensile Strength, MPa Figure 3 Figure 4 Red Color Indicates Outlier Pink Color Indicates Questionable Green Color Indicates Satisfactory Page 19 of 22

20 Yield Strength, MPa Figure 5 Figure 6 Red Color Indicates Outlier Pink Color Indicates Questionable Green Color Indicates Satisfactory Page 20 of 22

21 Elongation, % Figure 7 Figure 8 Red Color Indicates Outlier Pink Color Indicates Questionable Green Color Indicates Satisfactory Page 21 of 22

22 OUTLIER RESULTS Overall 32 Laboratories have participated in this proficiency testing program and the results are given below in tabulated form TABLE 6: OUTLIER RESULTS SUMMARY S. No. Test Parameters No. of Results Questionable Outlier 1. Ultimate Tensile Strength (MPa) Yield Strength (MPa) Elongation, % In case the Performance of the laboratory in the proficiency testing is not found satisfactory, the laboratory should find out its causes of inadequacy. Once the causes are analysed it would be possible for the laboratory to identify the number of areas where improvement is needed. Page 22 of 22

Protocol Page 1 of 11. Protocol for Proficiency testing scheme for Bitumen Programme No. GPTS/PT 05

Protocol Page 1 of 11. Protocol for Proficiency testing scheme for Bitumen Programme No. GPTS/PT 05 Tel Nos. +91 79 2656 5405, 2656 1104, Mob Nos. +91 98254 13148, 93270 17517, Fax Nos. +91 79 2656 3240 Email sales@globalptservices.com, nilesh@globalptservices.com Protocol Page 1 of 11 Protocol for Proficiency