INTERNATIONAL STANDARD
Non-destructivetesting-Ultrasonic testing-Specificationforcalibration block No.1
relatives au bloc d'etalonnage n° 1 Essais non destructifs - Controle par ultrasons - Specifications
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Foreword
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adopted by the technical mittees are circulated to the member bodies for voting. Publication as anInternational Standard requires approval by at least 75 % of the member bodies casting a vote.
rights. ISO shall not be held responsible for identifying any or all such patent rights. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
CEN/TC138Non-destructive testing incollaboration withTechnicalCommittee ISO/TC135 Non-destructivebetween ISO and CEN (Vienna Agreement)
This second edition cancels and replaces the first edition (ISO 2400:1972) which has been technically revised.
Changes from the first edition include the addition of:
-a new clause on manufacture of the block;--a new clause on sound velocities;-a new clause on marking and certification of the blocks;-a new clause on possible modifications to block No. 1;- a new clause on the use of existing blocks;-a normative annex on the determination of velocities.
forcalibrationblockNo.1
1Scope
This International Standard specifies requirements for the dimensions material and manufacture of a steelblock for calibrating ultrasonic test equipment used in manual testing.
2Normativereferences
references only the edition cited applies. For undated references the latest edition of the referenced document(including any amendments) applies.
ISO 5577 Non-destructive testing - Uitrasonic inspection -Vocabulary
EN 1330-4 Non-destructive testing - Terminoiogy - Part 4: Terms used in ultrasonic testing
structural steels
3Terms and definitions
For the purposes of this document the terms and definitions given in ISO 5577 and EN 1330-4 apply.
4Manufacture
4.1Steel
Blocks shall be manufactured from steel grade S355J0 specified in EN 10025-2 or from steel of an equivalent grade.
4.2 Dimensions
The dimensions of calibration block No. 1 shall be as shown in Figure 1.
NOTEThis International Standard does not include any requirement for a plastic insert.
4.3Machining heat treatment and surface finish
Blocks shall be rough-machined to a dimension of 320 mm × 120 mm × 30 mm before heat treatment whichshall consist of:
austenitizing at 920 °C for 30 min;- tempering by heating to 650 °C for 3 h;- cooling in still air.
- rapid cooling (quenching) in water;
All external surfaces shall be machined to an Ra value not greater than O 8 μm.
