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ASTM A537 Class 2

1. Scope

This Technical Specification TS covers the supply of the following equipment:

· ASTM A537 Class 2 Plates for tank’s shells.

The Supplier must guarantee the production and operation conditions, including non-specified parameters in this document, if they are relevant for the fulfilment of the guaranteed design or for safety reasons.

2. Materials

The material shall conform to the requirements of ASTM Specification A537/A537M for Class 2, latest edition, with the additional supplementary requirements as described herein.

Any conflict between the requirements of this document and the requirements of applicable ASTM Specifications shall be brought to the attention of the purchaser for clarification.

3. Chemical Requirements

The steel shall conform to the chemical requirements shown in ASTM Specification A537/A537M and A20/A20M, latest editions.

4. Mechanical Requirements

The steel shall conform to the mechanical requirements shown in ASTM Specification A537/A537M for Class 2 and A20/A20M, latest editions, with the following additional requirements:

· Supplementary Requirement S5 applies.

1. The Charpy V-notch impact test shall be performed at 0oC. Impact test specimens shall be taken transverse to the direction of final plate rolling.

2. The minimum average energy value of the three impact specimens shall be 41 J (30 ft-lb), with no more than one specimen below the minimum average, and in no case shall this value be below 34 J (25 ft-lb).

3. The requirements and acceptance criteria of sub-size specimens shall be per ASTM Specification A20/A20M, latest edition.

5. Heat Treatment

The steel shall be quenched and tempered per ASTM Specification A537/A537M for Class 2 and A20/A20M, latest editions and flattened after heat treatment, with the following additional requirements:

· Supplementary Requirement S3 applies.

1. Test coupons shall be heated per ASTM Specification A20/A20M S3, latest edition, to simulate postweld heat treatment during fabrication by heating to 600 °C nominal, for 1 hour per 25 mm of thickness.   

2. The rate of heating in excess of 315 °C shall be not more than 5645 °C per hour divided by the maximum metal thickness, in mm, of the plate being heated, but in no case shall it be more than 220 °C per hour.

3. At temperatures over 315 °C, cooling shall be done in a closed furnace or cooling chamber at a rate not greater than 7055 °C per hour divided by the maximum metal thickness, in mm of the plates affected; in no case shall the rate be more than 275 °C per hour. At temperatures of 315 °C and below, the material may be cooled in still air.

6. Plate Edges

The plate edges shall be sheared, machined, or flame cut.  

7. Marking

Each plate shall be marked per part 13 of ASTM Specification A20/A20M, latest edition, with the following additional requirements:

1. Mark each plate with white non-chip paint with the piece mark or plate number, and the length, width, thickness of the plate and the test temperature.  The plate number shall identify the purchase order item number. The letter "F" or "C" shall follow the test temperature to designate the Fahrenheit or Centigrade scales respectively

2. For steel stamps, low-stress dies must be used. Circle the stamping impressions with white non-chip paint.  

8. Mill Test Reports

Mill test reports shall be sent to the purchaser within 48 hours after shipment of the plates.

Mill test reports shall list all information required in ASTM Specification A20/A20M, latest edition, as well as the following information:

1. The designation or proprietary name and grade of plates tested.

2. The ordered dimensions, heat/slab no., and piece mark or plate number of the plates tested.

3. The purchase order and contract numbers.

4. In addition to the elements required by ASTM Specification A537/A537M, report the heat analysis amounts of any other deliberately added element.

9.  Rejection and Repair of Defects

No repair welding is permitted without prior approval by the purchaser. Unless otherwise agreed by the purchaser, repairs involving welding shall be made by the purchaser with the costs charged to the plate manufacturer. Only ASME Code Section IX qualified welders may be used.

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