CN103103444A - Drill collar steel and heat treatment process thereof - Google Patents
Drill collar steel and heat treatment process thereof Download PDFInfo
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- CN103103444A CN103103444A CN2013100677417A CN201310067741A CN103103444A CN 103103444 A CN103103444 A CN 103103444A CN 2013100677417 A CN2013100677417 A CN 2013100677417A CN 201310067741 A CN201310067741 A CN 201310067741A CN 103103444 A CN103103444 A CN 103103444A
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- drill collar
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- collar steel
- heat treatment
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Abstract
The invention relates to drill collar steel and a heat treatment process thereof, and belongs to the technical field of material molding. The billet steel of the drill collar steel comprises the following chemical components in percentage by weight: 0.40-0.50% of C, 0.10-0.40% of Si, 0.6-1.3% of Mn, <=0.020% of P, <=0.010% of S, 0.80-1.20% of Cr, 0.10-0.30% of Mo, <=0.0010% of RE, and the balance of Fe and inevitable impurities. According to the heat treatment process, the quenching temperature is between 810 and 890 DEG C, and the tempering temperature is between 600 and 660 DEG C. The yield strength of the drill collar steel produced through the heat treatment process is more than or equal to 860MPa, the tensile strength of the drill collar steel is more than or equal to 980MPa, at normal temperature, the longitudinal ballistic work (V-shaped notch) of the drill collar steel is more than 50J, the Z-direction performance of the drill collar steel is more than 50%, the surface hardness value of the drill collar steel is greater than 310HB, and the end surface hardness value is greater than 320HB. A variety of non-metallic inclusions are lower than 1.5-grade. The drill collar steel has the highlighted advantages of containing no high-cost Ni and Nb elements and being low in smelting cost. The drill collar steel is high in strength and extensibility and high in impact toughness margin.
Description
Technical field
Belong to the forming materials technical field, particularly Heat Treatment Of Steel technique.
Background technology
Petroleum industry, more and more is subject to various countries and payes attention to as the global strategy goods and materials with steel products.Along with the continuous growth of petroleum demand amount, further stimulated the development of oil production industry.Steel for non-magnetic drill collar has the characteristics such as high strength, high tenacity, nonmagnetic and antifatigue, in the stone oil drill collar series product, belongs to hi-tech difficulty, high value-added product, is mainly used in location and monitoring in Process of Oil Well Drilling.At present, the patent that relates to steel for drill collar is more, as publication number be CN1038353 Chinese invention patent " steel for high-strength non-magnetic drill collar " though described in do not need thermal treatment can obtain the high strength drill collar, but Ni in alloying element, Cr, Mo and the higher content of Nb element cause product cost significantly to increase; Application number is that its Mn content of Chinese invention patent " novel non-magnetic drill collar " of 200910307749.5 reaches 18-22% for another example, can only consider the technique preparation with die casting, and during actual production, limitation is large.The invention discloses a kind of steel for drill collar and thermal treatment process thereof, alloy content is not only low, and thermal treatment process is workable.
Summary of the invention
The objective of the invention is to disclose a kind of steel for drill collar and thermal treatment process thereof, the chemical composition of its steel billet and content (weight percent) should meet: C0.40-0.50%, Si0.10-0.40%, Mn0.6-1.3%, P≤0.020%, S≤0.010%, Cr0.80-1.20%, Mo0.10-0.30%, RE≤0.0010%, surplus is Fe and inevitable impurity.Thermal treatment process is: 810-890 ℃, tempering temperature 600-660 ℃, quenchant is oil or water.Steel for drill collar yield strength 〉=860MPa, the tensile strength 〉=980MPa of explained hereafter thus, under normal temperature condition, impact of collision merit (v-notch) is greater than 50J, and the Z-direction performance is greater than 50%, and the surface hardness value is greater than 310HB, and the end hardness value is greater than 320HB.All kinds of non-metallic inclusions are all less than 1.5 grades.
Outstanding advantages of the present invention is not contain expensive Ni and Nb element, and smelting cost is low.Intensity and unit elongation are high, the impelling strength surplus is large.
Embodiment
The invention will be further described below in conjunction with embodiment.
Embodiment 1:
(weight percent) chemical composition of steel billet is: C0.47%, and Si0.26%, Mn1.07%, P0.015%, S0.008%, Cr1.04%, Mo0.21%, Ce0.0005%, surplus is Fe and inevitable impurity.Heat-treat under+630 ℃ of tempering process conditions of 830 ℃ of quenchings, every mechanical property of test steel sees Table 1, and the non-metallic inclusion grading sees Table 2, and surperficial and inboard hardness sees Table 3.
Table 1 mechanical properties test result
| Numbering | Rp 0.2(MPa) | Rm(MPa) | A 5(％) | Z(％) | Akv(J) | HB |
| 1 | 937 | 1041 | 17.5 | 58 | 59 | 298 |
The examination of nonmetallic inclusion result (level) of table 23 stove test steel
Drill collar material surface and inboard hardness after table 3 thermal treatment
Embodiment 2:
(weight percent) chemical composition of steel billet is: C0.47%, and Si0.26%, Mn1.07%, P0.015%, S0.008%, Cr1.04%, Mo0.21%, Ce0.0005%, surplus is Fe and inevitable impurity.Heat-treat under+630 ℃ of tempering process conditions of 830 ℃ of quenchings, every mechanical property of test steel sees Table 4, and the non-metallic inclusion grading sees Table 5, and surperficial and inboard hardness sees Table 6.
Table 4 mechanical properties test result
| Numbering | Rp 0.2(MPa) | Rm(MPa) | A 5(％) | Z(％) | Akv(J) | HB |
| 2 | 886 | 997 | 17.5 | 59 | 60 | 306 |
The examination of nonmetallic inclusion result (level) of table 53 stove test steel
Drill collar material surface and inboard hardness after table 6 thermal treatment
Claims (3)
1. steel for drill collar, it is characterized in that chemical composition content is by weight percentage: C0.40-0.50%, Si0.10-0.40%, Mn0.6-1.3%, P≤0.020%, S≤0.010%, Cr0.80-1.20%, Mo0.10-0.30%, RE≤0.0010%, surplus is Fe and inevitable impurity.
2. the thermal treatment process of a steel for drill collar, is characterized in that described round steel has chemical composition claimed in claim 1, and its thermal treatment process is: quenching temperature 810-890 ℃, tempering temperature 600-660 ℃, quenchant is oil or water.
3. the thermal treatment process of a kind of steel for drill collar according to claim 2, it is characterized in that after treatment yield strength 〉=860MPa, tensile strength 〉=980MPa, under normal temperature condition and v-notch, the impact of collision merit is greater than 50J, the Z-direction performance is greater than 50%, the surface hardness value is greater than 310HB, the end hardness value is greater than 320HB, and all kinds of non-metallic inclusions are all less than 1.5 grades.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013100677417A CN103103444A (en) | 2013-03-04 | 2013-03-04 | Drill collar steel and heat treatment process thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013100677417A CN103103444A (en) | 2013-03-04 | 2013-03-04 | Drill collar steel and heat treatment process thereof |
Publications (1)
| Publication Number | Publication Date |
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| CN103103444A true CN103103444A (en) | 2013-05-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013100677417A Pending CN103103444A (en) | 2013-03-04 | 2013-03-04 | Drill collar steel and heat treatment process thereof |
Country Status (1)
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| CN (1) | CN103103444A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107815615A (en) * | 2017-09-28 | 2018-03-20 | 山西风雷钻具有限公司 | Low-temperature high impact drill collar |
| CN112226684A (en) * | 2020-09-24 | 2021-01-15 | 南京钢铁股份有限公司 | Drill collar steel |
| CN112609127A (en) * | 2020-11-27 | 2021-04-06 | 马鞍山钢铁股份有限公司 | Steel for high-strength and high-toughness drill string adapter and production process thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62109950A (en) * | 1985-11-07 | 1987-05-21 | Sumitomo Metal Ind Ltd | Steel for nonmagnetic drill collar |
| CN102851595A (en) * | 2012-08-23 | 2013-01-02 | 天津摩尔工程材料实验室 | Steel for drill collar with high toughness and heat treatment method thereof |
-
2013
- 2013-03-04 CN CN2013100677417A patent/CN103103444A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62109950A (en) * | 1985-11-07 | 1987-05-21 | Sumitomo Metal Ind Ltd | Steel for nonmagnetic drill collar |
| CN102851595A (en) * | 2012-08-23 | 2013-01-02 | 天津摩尔工程材料实验室 | Steel for drill collar with high toughness and heat treatment method thereof |
Non-Patent Citations (3)
| Title |
|---|
| 胡进: "4145H(42CrMo)钻铤钢内在性能综合分析", 《特钢技术》, no. 1, 31 December 2002 (2002-12-31), pages 16 * |
| 苏志才等: "Φ89mm和Φ105mm 4145H石油钻铤管的试制", 《特殊钢》, vol. 23, no. 4, 31 August 2002 (2002-08-31) * |
| 贺景春等: "含稀土高抗挤毁石油套管的研制", 《稀土》, vol. 31, no. 2, 30 April 2010 (2010-04-30), pages 14 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107815615A (en) * | 2017-09-28 | 2018-03-20 | 山西风雷钻具有限公司 | Low-temperature high impact drill collar |
| CN112226684A (en) * | 2020-09-24 | 2021-01-15 | 南京钢铁股份有限公司 | Drill collar steel |
| CN112609127A (en) * | 2020-11-27 | 2021-04-06 | 马鞍山钢铁股份有限公司 | Steel for high-strength and high-toughness drill string adapter and production process thereof |
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Application publication date: 20130515 |