Method for improving grain size of TP347HFG wrought pipe billet

• Main Authors: XIA YAN, SHI PUJI, XU LIWEI
• Format: Patent
• Language: English
• Published: 04.03.2015
• Subjects: ALLOYS; CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; TREATMENT OF ALLOYS OR NON-FERROUS METALS

The invention relates to a method for improving grain size of a TP347HFG wrought pipe billet, belonging to the field of forging. The method is characterized by comprising the following steps: heating a forging material to 1100 DEG C above, keeping the temperature for 3-3.5 hours until the internal and external temperatures of the steel are uniform, discharging, and naturally cooling to room temperature in air. The wrought pipe billet produced by the technique has the advantages of obviously improved grain size and favorable grain size uniformity; and the method is utilized to obtain the uniform structure with the crystal grain of Grade 6-5.