High sulfur resistance petroleum drilling rod heat treatment process

An oil drill pipe, high sulfur resistance technology, applied in the field of iron and steel metallurgy, can solve the problem that the sulfur resistance performance of the thickened end cannot meet the high sulfur resistance, and achieves improving the tempering resistance stability, reducing the residual stress, and increasing the tempering temperature. Effect

Inactive Publication Date: 2014-05-21
WUXI XINSANZHOU STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in the world, Cr-Mo steel or Mn-Mo steel with moderate hardenability is usually used to manufacture high-strength drill pipes, but the structure and sulfur resistance of the thickened end may not meet the requirements of high sulfur resistance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A heat treatment process for oil drill pipe with high sulfur resistance, the chemical composition of the oil drill pipe is composed of the following components in weight percentage: C: 0.14, Si: 0.5, Mn: 0.7, Cr: 2.2, Mo: 1.4, V: 0.40, Nb: 0.07, Ti: 0.08, Ca: 0.01; Cu: 0.15, P: ≤0.015; S: ≤0.01; the rest is Fe and unavoidable impurities; the heat treatment process includes the following steps:

[0027] 1) Quenching: The heating temperature is 960°C, and the holding time is 1.5 hours; then put it into a pool with a stirrer, and then perform cryogenic treatment at -80°C for 30 minutes;

[0028] 2) Tempering: the heating temperature is 510°C, and the holding time is 4 hours.

Embodiment 2

[0030] A heat treatment process for oil drill pipe with high sulfur resistance, the chemical composition of the oil drill pipe is composed of the following components in weight percentage: C: 0.18, Si: 0.3, Mn: 0.9, Cr: 1.8, Mo: 1.6, V: 0.2, Nb: 0.09, Ti: 0.06, Ca: 0.02; Cu: 0.05, P: ≤0.015; S: ≤0.01; the rest is Fe and unavoidable impurities; the heat treatment process includes the following steps:

[0031] 1) Quenching: The heating temperature is 980°C, and the holding time is 0.5 hours; then put it into a pool with a stirrer, and then perform cryogenic treatment at -80°C for 40 minutes;

[0032] 2) Tempering: the heating temperature is 510°C, and the holding time is 4 hours.

Embodiment 3

[0034] A heat treatment process for oil drill pipe with high sulfur resistance, the chemical composition of the oil drill pipe is composed of the following components in weight percentage: C: 0.16, Si: 0.4, Mn: 0.8, Cr: 2.0, Mo: 1.5, V: 0.30, Nb: 0.08, Ti: 0.07, Ca: 0.015; Cu: 0.10, P: ≤0.015; S: ≤0.01; the rest is Fe and unavoidable impurities; the heat treatment process includes the following steps:

[0035] 1) Quenching: The heating temperature is 970°C, and the holding time is 1 hour; then put it into a pool with a stirrer, and then perform cryogenic treatment at -80°C for 35 minutes;

[0036] 2) Tempering: the heating temperature is 520°C, and the holding time is 3 hours.

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Abstract

The present invention discloses a high sulfur resistance petroleum drilling rod heat treatment process. The components of the high sulfur resistance petroleum drilling rod comprise: 0.14-0.18 wt% of C, 0.3-0.5 wt% of Si, 0.7-0.9 wt% of Mn, 1.8-2.2 wt% of Cr, 1.4-1.6 wt% of Mo, 0.2-0.40 wt% of V, 0.07-0.09 wt% of Nb, 0.06-0.08 wt% of Ti, 0.01-0.02 wt% of Ca, 0.05-0.15 wt% of Cu, less than or equal to 0.015 wt% of P, less than or equal to 0.01 wt% of S, and the balance of Fe and unavoidable impurities. The heat treatment process comprises: 1) quenching, wherein the heating temperature is 960-980 DEG C, the thermal insulation time is 0.5-1.5 h, and the obtained material is placed in a water tank with a stirrer, and then is subjected to a cryogenic treatment for 30-40 min at a temperature of -80 DEG C; and 2) tempering, wherein the heating temperature is 510-530 DEG C, and the thermal insulation time is 2-4 h.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to a heat treatment process for a highly sulfur-resistant petroleum drill pipe. Background technique [0002] The traditional main process of producing sulfur-resistant drill pipe is: thicken the two ends of the hot-rolled seamless steel pipe according to the required size, and then perform overall quenching and tempering heat treatment to make a qualified drill pipe body. After the heat-treated tool joint and the drill pipe body are connected by friction butt welding, the weld seam is heat treated, and finally the oil drill pipe is made by proper machining. [0003] For the drill pipe body, in order to ensure the strength after butt welding with the tool joint, the pipe end must be upset and thickened before being welded with the tool joint. The higher the steel grade of the drill pipe, the thicker the thickened end. The pipe body needs to be heat treated as a wh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/28C21D1/18
Inventor 林永峰
Owner WUXI XINSANZHOU STEEL
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