API 2YGr60 steel heat treatment

API 2YGr60 steel is a quenched and tempered steel plate for marine structures. It is used for welded structural parts of marine structures. The steel plates in key parts must resist impact, plastic fatigue loads and laminar tearing.
 
API 2YGr60 steel plate delivery status: quenched and tempered
Heat treatment of API 2YGr60 steel:
Quenching and tempering, cooling to below 538°C after rolling, and then heating to austenite structure between 815°C and 925°C, holding for enough time to make the material temperature uniform, quenching with a suitable liquid medium, and quenching at 565°C to 705°C Tempering in the temperature range of ℃. Due to the inherent characteristics of quenched and tempered steel, the steel plate produced according to this standard cannot be formed or post-welded heat treated at a temperature higher than the tempering temperature used in production, otherwise its strength and toughness will suffer irreversible and significant loss. If thermoforming is required, the tensile and notch toughness properties of the final part should be tested, and the results should meet the requirements of this code.
 
Ultrasonic flaw detection:
A. According to ASTM Spec A578/A578M special purpose ordinary steel plate and composite steel plate and composite steel plate direct wave inspection standard specification, each steel plate is subjected to pulse reflection ultrasonic inspection, and the acceptance level used is A level.
B. An inspection report for each steel plate should be provided, and the area where the bottom reflected wave attenuated by more than 50% should be indicated on the sketch.
 

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