Cookies
Potrebujeme váš súhlas na využitie jednotlivých dát, aby sa vám okrem iného mohli ukazovať informácie týkajúce sa vašich záujmov. Súhlas udelíte kliknutím na tlačidlo „OK“.
ASTM E186-20
Standard Reference Radiographs for Heavy-Walled (2 to 412 in. (50.8 to 114 mm)) Steel Castings
NORMA vydaná dňa 1.6.2020
Informácie o norme:
Označenie normy: ASTM E186-20
Poznámka: NEPLATNÁ
Dátum vydania normy: 1.6.2020
Kód tovaru: NS-997665
Počet strán: 5
Približná hmotnosť: 15 g (0.03 libier)
Krajina: Americká technická norma
Kategória: Technické normy ASTM
Kategórie - podobné normy:
Anotácia textu normy ASTM E186-20 :
Keywords:
discontinuity classification criterion, gamma-ray, reference radiographs, steel castings, X-ray,, ICS Number Code 77.040.20 (Non-destructive testing of metals),77.140.80 (Iron and steel castings)
Doplňujúce informácie
| Significance and Use | ||||||||||||||||||
|
4.1Graded reference radiographs are intended to provide a guide enabling recognition of specific casting discontinuity types and relative severity levels that may be encountered during typical fabrication processes. Reference radiographs containing ungraded discontinuities are provided as a guide for recognition of a specific casting discontinuity type where severity levels may not be needed. These reference radiographs are intended as a basis from which manufacturers and purchasers may, by mutual agreement, select particular discontinuity classes to serve as standards representing minimum levels of acceptability (see Sections 6 and 7). 4.2Reference radiographs represented by this standard may be used, as agreed upon in a purchaser supplier agreement, for energy levels, thicknesses, or both, outside the range of this standard when determined applicable for the casting service application. Severity levels of similar discontinuity categories and energy level range of E446 or E280 reference radiographs may alternatively be used, as determined appropriate for the casting service application, if so agreed upon in a purchaser supplier agreement (see Section 1 and 5.1). 4.3Procedures for evaluation of production radiographs using applicable reference radiographs of this standard are prescribed in Section 8; however, there may be manufacturing-purchaser issues involving specific casting service applications where it may be appropriate to modify or alter such requirements. Where such modifications may be appropriate for the casting application, all such changes shall be specifically called-out in the purchaser supplier agreement or contractual document. Section 9 addresses purchaser supplier requisites where weld repairs to castings may be required. 4.4Personnel utilizing reference radiographs to this standard shall be qualified and authorized to perform radiographic interpretation in accordance with a nationally or internationally recognized NDT personnel qualification practice or standard such as ANSI/ASNT-CP-189, SNT-TC-1A, NAS 410, ISO 9712, or a similar document and certified by the employer or certifying agency, as applicable. The practice or standard used and its applicable revision shall be identified in the contractual agreement between the using parties. A certified Level III shall be available to assist with interpreting specifications and product requirements as applied to the reference radiographs (if the Level III is the radiographic interpreter, this may be the same person). |
||||||||||||||||||
| 1. Scope | ||||||||||||||||||
|
1.1These reference radiographs1.2These reference radiographs consist of three separate volumes as follows: 1.2.1Volume I: 1-MV X-rays and Iridium-192 (called 1 to 2Mev X-rays in previous editions)-Set of 28 plates (1.2.2Volume II: 2 to 4-MV X-rays and Cobalt-60 (called gamma rays in previous editions). This includes cobalt-60 or equivalent isotope radiation and from 2-MV up to 4-MV X-rays- Set of 28 plates (nominal 5 by 8 in.) in a 15 by 17 in. ring binder. 1.2.3Volume III: 4-MV to 30-MV X-rays (called 10 to 24 Mev X-rays in previous editions)- Set of 28 plates (1.2.4Unless otherwise specified in a purchaser supplier agreement (see 1.1), each volume is for comparison only with production radiographs produced with radiation energy levels within the thickness range covered by this standard. Each volume consists of three categories of graded discontinuities in increasing severity levels, and three categories of ungraded discontinuities. Reference radiographs containing ungraded discontinuities are provided as a guide for recognition of a specific casting discontinuity type where severity levels are not needed. Following is a list of discontinuity categories, types, and severity levels for the adjunct reference radiographs of this standard: 1.2.4.1Category AGas porosity; severity levels 1 through 5. 1.2.4.2Category BSand and slag inclusions; severity levels 1 through 5. 1.2.4.3Category CShrinkage; three types: (1)(2)(3)1.2.4.4Category DCrack; one illustration (D3 in pre-1972 documents). 1.2.4.5Category EHot tear; one illustration in pre-1972 documents. 1.2.4.6Category FInsert; one illustration (EB3 in pre-1972 documents). 1.3From time to time, there may be minor changes to the process for manufacturing of the reference radiograph adjunct materials. These changes could include changes in the films or processing chemicals used, changes in the dies or printing for the cardboard mats, etc.; however, in all cases, these changes are reviewed by the Illustration Monitoring Subcommittee and all reference radiographs are reviewed against a fixed prototype image to ensure that there are no changes to the acceptance level represented by the reference radiographs. Therefore, the adjunct reference radiographs remain valid for use with this standard regardless of the date of production or the revision level of the text standard. 1.4The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. 1.5These film reference radiographs are not intended to illustrate the types and degrees of discontinuities in steel castings when performing digital X-ray imaging. When performing digital X-ray imaging of these castings, refer to Digital Reference Images E3030. 1.6This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.7This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. |
||||||||||||||||||
| 2. Referenced Documents | ||||||||||||||||||
|
Doporučujeme:
