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[0003] Although the quenching and tempering process can meet the general requirements, it is rapidly cooled at a rate of 190-200°C / s during the quenching process, and the cooling rate is too slow, making it unsatisfactory for quenching and tempering
In the quenching treatment, after cooling to 320-325°C, it is naturally cooled to 30-40°C. Due to the slow natural cooling rate and the relatively high temperature of 320-325°C, the final result of quenching and tempering is affected, and the product quality is reduced. quality
Method used
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Embodiment 1
[0021] In this embodiment, a seamless steel pipe includes the following components in weight percentage, C: 0.38-0.43%, Si: 0.17-0.35%, Mn: 0.70-0.90%, P≤0.015%, S≤0.010%, Cr : 0.90~1.10%, Mo: 0.15~0.25%, Cu: ≤0.10%, Ni: ≤0.10%, AS≤0.015%, Sn≤0.015%, Sb≤0.010%, Pb≤0.008%, Bi≤0.010%, The balance is Fe.
[0022] This seamless steel pipe is quenched and tempered, and its steps are as follows:
[0023] (1) Quenching, the temperature is rapidly raised to 910°C at a speed of 30°C / s, and then rapidly cooled to about 310°C by spraying at a cooling rate of 210°C / s, and then sprayed twice to below 80°C;
[0024] (2) Tempering, the heating rate is 20-30°C / s, the temperature is raised to 630°C, and air-cooled after heat preservation;
[0026] In this embodiment, a quenching liquid is used for cooling in step (1).
[0027] In this embodiment, the quenching liquid is a polyether polymer quenching liquid, wherein the mass c...
Embodiment 2
[0029] In this embodiment, a seamless steel pipe includes the following components in weight percentage, C: 0.38-0.43%, Si: 0.17-0.35%, Mn: 0.70-0.90%, P≤0.015%, S≤0.010%, Cr : 0.90~1.10%, Mo: 0.15~0.25%, Cu: ≤0.10%, Ni: ≤0.10%, AS≤0.015%, Sn≤0.015%, Sb≤0.010%, Pb≤0.008%, Bi≤0.010%, The balance is Fe.
[0030] This seamless steel pipe is quenched and tempered, and its steps are as follows:
[0031] (1) Quenching, the temperature is rapidly raised to 910°C at a rate of 30°C / s, and then rapidly cooled to below 80°C by spraying once at a cooling rate of 210°C / s;
[0032] (2) Tempering, the heating rate is 20-30°C / s, the temperature is raised to 630°C, and air-cooled after heat preservation;
[0034] In this embodiment, a quenching liquid is used for cooling in step (1).
[0035] In this embodiment, the quenching liquid is a polyether polymer quenching liquid, wherein the mass content of the polyether polymer mat...
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Abstract
The invention relates to an on-line quenching and tempering technology of a seamless steel tube. The technology comprises the steps as follows: (1), quenching: the temperature quickly rises to 900 DEG C to 920 DEG C at a speed of 25 DEG C-35 DEG C / s, then the temperature is quickly decreased to about 310 DEG C at a speed of 200 DEGC-220 DEG C / s by primary spraying, and secondary spraying is performed until the temperature is lower than 80 DEG C; and (2), tempering: the temperature rising speed is 20 DEG C-30 DEG C / s, the temperature rises to a range from 620 DEG C to 640 DEG C, and air cooling is performed after heat preservation. The on-line quenching and tempering technology of the seamless steel tube can reduce harmful elements and improve purity of steel, so that scrapping caused by harmful defects such as folding, cracks, separation layers, surface decarburization and the like generated in hot and cold machining of a pipe material can be avoided.
Description
technical field [0001] The invention relates to an online quenching and tempering process for seamless steel pipes, which belongs to the processing technology for steel pipes. Background technique [0002] In the invention patent specification with the publication number CN 102676780 A, a quenching and tempering process for alloy steel pipes is disclosed. 35-40 minutes, then cool down to below 500°C; 2) Quenching treatment: After raising the temperature to 930-935°C at a rate of 5-10°C / min, keep it warm for 50-60 minutes, then, at 190-200°C / min After rapid cooling to 320-325°C at a speed of 2 seconds, naturally cool to 30-40°C; 3) Tempering treatment: After heating up to 500-510°C at a speed of 5-10°C / min, keep it warm for 230-240 minutes, then , naturally cooled to room temperature. [0003] Although this quenching and tempering process can meet the general requirements, it rapidly cools at a rate of 190-200° C. / second during the quenching process, and the cooling rate is...
Claims
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