The invention relates to a production process of precision seamless steel tubes. The production process includes the following steps of feeding, wherein
steel tube raw materials are pushed into a pushing
machine; heating, wherein
steel tube blanks are heated through a
natural gas hot blast furnace, and the
heating temperature is 1,180-1,200 DEG C; punch-forming, wherein the steel
pipe blanks are punched through a
punching machine, and steel tubes are obtained; finish rolling, wherein the steel tubes are rolled through a three-roller finish rolling
machine, and the sizes of the internal diameters and the external diameters of the steel tubes are machined into designated sizes;
quenching, wherein water serves as a
quenching medium, the
water temperature is 20-40 DEG C, and the temperatures of the quenched steel tubes are 830-850 DEG C;
tempering, wherein the steel tubes are fed into a
tempering furnace, the
tempering temperature is 550-620 DEG C, and the time is 20-30 min; and straightening, wherein the steel tubes are straightened through a straightener.
Diameter reducing and wall thickening of the seamless steel tubes are achieved in the finish rolling production procedure of the process, the production process is suitable for the
steel tube blanks and waste steel tubes, and stable mechanical performance and better treatment smoothness are achieved; and compared with the existing seamless steel tubes, the precision seamless steel tubes are more durable, the
hardness,
plasticity and
toughness are all improved, and
machining is better facilitated.