THIS ALLOY STEEL IS USED PRIMARILY FOR THE MANUFACTURE OF TOOLS IN THE OIL INDUSTRY. SUPPLIED WITH A STRAIGHTNESS TOLERANCE OF 1/8″ IN ANY 5 FOOT LENGTH, WITH A GRAIN SIZE OF 6 OR FINER, AS PER ASTM E 112. THIS STEEL IS HEAT TREATED AND HARDENED BY WATER QUENCH, TEMPERED, STRESS RELIEVED AND SUPPLIED IN A ROUGH TURNED CONDITION. ALL BARS ARE ULTRASONIC TESTED, WITH CHARPY V IMPACT @ 57 DEGREES CELSIUS FT. LBS. WITH MINIMUM AVERAGE VALUE OF 3 READINGS. NO MORE THAN ONE SINGLE VALUE SHALL BE LOWER THAN 5 FT. LBS. BELOW STATED AVERAGE VALUE.
CAN BE SUPPLIED TO COMPLY TO API SPEC. 7 IN THE MANUFACTURE OF DRILL COLLARS IN 31 TO 31-1/2 FOOT BARS.