CN103276297B - A kind of self-joining type high strength cord is cored the manufacture method of drilling rod weldless steel tube - Google Patents

A kind of self-joining type high strength cord is cored the manufacture method of drilling rod weldless steel tube Download PDF

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CN103276297B
CN103276297B CN201310230066.5A CN201310230066A CN103276297B CN 103276297 B CN103276297 B CN 103276297B CN 201310230066 A CN201310230066 A CN 201310230066A CN 103276297 B CN103276297 B CN 103276297B
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treatment
steel tube
carry
cold
drilling rod
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CN103276297A (en
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吴国忠
况雪军
肖红
路继林
叶火群
刘绍波
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浙江新纪元管业科技有限公司
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Abstract

The present invention relates to a kind of self-joining type high strength cord to core drilling rod weldless steel tube, it is characterized in that the component comprising following weight per-cent: 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%, surplus is Fe.The present invention has very high strength.The invention still further relates to the manufacture method of this weldless steel tube.

Description

A kind of self-joining type high strength cord is cored the manufacture method of drilling rod weldless steel tube
Technical field
The present invention relates to a kind of self-joining type high strength cord to core drilling rod weldless steel tube, the invention still further relates to the manufacture method of this weldless steel tube, belong to steel pipe production.
Background technology
Along with the high speed development of Chinese national economy, the shortage of Mineral resources has become the strategic problem that solution is badly in need of period in country " 12 ".Substantially, explore end according to the Mineral resources within existing domestic 1500 meters of geology exploration right prestige mechanism investigation display, in for some time from now on, the degree of depth of core drilling construction is progressively to the medium-length hole development of 2000 ~ 3000 meters.And the probing of this degree of depth generally adopts full-hydraulic power head drill in the world, and China generally used spindle-type drill in the past, by the mode that joint connects between drilling rod with drilling rod.This probing mode drilling depth is shallow, and drilling efficiency is low.Within nearly 2 years, domestic geological drilling tools manufacturing enterprise absorbs on the basis of foreign technology in research, starts start to walk development & production high performance hydraulic rig and drilling tool, progressively eliminates old-fashioned spindle drill, realizes the production domesticization of high-performance rig and drilling tool, reduces import.Therefore for the research and development in crucial boring tool with produce the self-joining type high strength cord that matches drilling rod weldless steel tube body material of coring and also become the difficult point of process for manufacturing seamless steel tubes and new research and development problem.Current domestic small-sized weldless steel tube great majority adopt hollow billet perforation to add the mode of production of cold-drawn, because this kind of mode of production investment is little, format change is flexible, production cost is low, there is certain suitability, its shortcoming is that geometric accuracy is poor, and particularly inhomogeneity of wall thickness deviation is large, is not suitable for high the coring drilling rod Precision Seamless Steel Tubes as self-joining type high strength cord of production right alignment.
Publication number is disclose a kind of weldless steel tube in the specification sheets of CN100400679C, it is characterized in that, described weldless steel tube is the weldless steel tube directly used after hot rolling tubulation, wherein, calculate in mass %, containing C:0.10 ~ 0.25%, Si:0.05 ~ 1.00%, Mn:0.50 ~ 2.50%, below P:0.03%, below S:0.05%, below Cr:0.40 ~ 1.50%, below Mo:0.05 ~ 1.50%, V:0.02 ~ 0.30%, Al:0.003 ~ 0.10, B:0.0003 ~ 0.01%, N:0.001 ~ 0.02%, surplus is Fe, ferrite area occupation ratio is less than 10%.Although its manufacturing processed is simple, its intensity can not reach requirement.
Publication number is the working method disclosing a kind of geological drilling alloy steel seamless steel tube in the specification sheets of CN102953019A: it comprises the following steps:
The first step: the pipe adopting composition described in common process refining claim 1;
Second step: cooled above-mentioned pipe segmentation is placed in process furnace and heats;
3rd step: weldless steel tube hollow forging is made in pipe hot rolling described in step 2;
4th step: to anneal to weldless steel tube hollow forging described in step 3, cold-drawn, makes it complete size sizing;
5th step: normalizing air cooling is carried out to weldless steel tube described in step 4, and utilize straightener to enter after carrying out surface treatment
Row first time aligning;
6th step: carry out induction furnace quenching to the weldless steel tube after above-mentioned aligning, then carries out tempering air cooling, and utilizes
Straightener carries out second time aligning;
7th step: Pipe Cutting, inspection and inspection.Although the method can manufacture the weldless steel tube of geological drilling, owing to only carrying out cold-drawn, so precision can not ensure.
A kind of geological drilling alloy steel seamless steel tube is also disclosed in this specification sheets, the chemical composition of described geological drilling alloy steel seamless steel tube is by weight percentage: C:0.25 ~ 0.30, Si:0.1 ~ 0.35, Mn:0.85 ~ 1.00, P≤0.012, S≤0.008, Cr:0.90 ~ 1.10, Mo:0.40 ~ 0.50, Ni, Cu≤0.1, Alt:0.015 ~ 0.030.Sn, Pb, As, Sb≤0.01, surplus is Fe.Wherein carbon content is on the low side, causes its insufficient strength, but only improves carbon content, because its plasticity causes processing not.
Summary of the invention
The object of the invention is to overcome above shortcomings in prior art, and provide a kind of high strength, good springiness, counter-bending, shock-resistant, anti abrasive high strength cord is cored drilling rod weldless steel tube, present invention also offers the manufacture method of this weldless steel tube.
The present invention's adopted technical scheme that solves the problem is: this self-joining type high strength cord is cored drilling rod weldless steel tube, it is characterized in that the component comprising following weight per-cent: 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%, surplus is Fe.
Content sum≤0.035% of AS, Sn, Sb, Pb and Bi of the present invention.Ensure the inner quality of steel pipe in the thermal treatment of its weldless steel tube and hot cold deformation processing, when making its cold deformation, plasticity is good, hollow billet after perforation thermal distortion reduces surface crack, sticks up the bad defect such as skin, absciss layer, and after final online Tempering and Quenching, comprehensive mechanical performance is excellent.
Self-joining type high strength cord of the present invention is cored the manufacture method of drilling rod weldless steel tube, it is characterized in that comprising the steps.
(1) be C:0.38 ~ 0.43% by weight percent, 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%, surplus is the pipe embryo of Fe, be placed in heating in process furnace, furnace temp is 1190 ~ 1250 DEG C.In chemical composition, P has cold shortness, S and Cu has red brittleness, therefore P, S, Cu and five large harmful element component contents are reduced, improve the purity of steel, the thermal distortion that can reduce weldless steel tube cracks, stick up the bad defect such as skin, absciss layer, and in above-mentioned chemical element, the content of C, Mn, Cr and Mo is for ensureing that tubing passes through anneal in process of production, there is good cold plasticity, favourable cold deformation, final modified time hardening capacity good, ensure high strength, the high comprehensive performance of tubing.The content of C, Mn, Cr and Mo is 0.38 ~ 0.43 after adjustment, 0.70 ~ 0.90,0.90 ~ 1.10, the range combinations of 0.15 ~ 0.25 ensures that tubing has high intensity when thermal treatment, hardening capacity is good, there is again certain plasticity, toughness simultaneously, C element can increase the intensity of steel but unsuitable too high, On Impact Toughness is harmful, its scope of practical experience is no more than 0.50%, the intensity of the favourable hardening capacity of Mn element, carburizing, raising steel, but Mn is not easily too high in steel alloy, because its stagnation point is lower, easily produce coarse-grain.Cr element can increase the intensity of steel, improves yield-point, oxidation-resistance, corrosion-resistant, can structure refinement and being uniformly distributed, thus plasticity, toughness might as well, but Cr too high levels, can affect hot-quenching.Mo element is conducive to crystal grain thinning, reduces the overheated tendency of steel, Heat stability is good, but in steel alloy, Mo is unsuitable too high, has impact to promotion decarburization.
(2) pipe is made hollow billet through hot-puncturing process, hot-puncturing process temperature is 1140 ~ 1200 DEG C.
(3) the cold rolling and Light deformation amount cold-drawn of pre-anneal treatment, surface treatment, lubrication, aximal deformation value is carried out successively to hollow billet; Annealing temperature 780 ~ 800 DEG C; Its object is to recover uniform formation, eliminate internal stress, reduce intensity, increase plasticity, be beneficial to follow-up cold rolling, cold-drawn aximal deformation value cold working and do not ftracture, its tensile strength is 670 ~ 720MPa, yield strength is 440 ~ 480MPa, elongation 24 ~ 26%, and steel pipe has good cold-forming property.Because cooling fast in atmosphere, its perlite is separated out more, and grain structure is thick, and intensity is high, and plasticity is low, and thermal stresses is large, is unfavorable for cold deformation, and hollow billet is by pre-anneal treatment, and reaustenitizing, can make tubing homogeneous microstructure, and intensity reduces, and plasticity improves.
Aximal deformation value is cold rolling, a sizing reduction 20 ~ 23%, a wall thickness reducing amount 21 ~ 24%, cold roller and deformed coefficient is 1.80 ~ 2.20, its objective is and utilize cold rolling advantage, once large tube reducing subtracts wall greatly, and interior metal flow faster is strengthened, there are significant all wall effects, improve the shallow defect of steel tube surface simultaneously.General pierced shell inhomogeneity of wall thickness is ± 8%, and can improve inhomogeneity of wall thickness after an aximal deformation value is cold rolling is ± 4%, can reduce once annealing, pickling, lubrication operation.To core drilling rod weldless steel tube NC specification for self-joining type high strength cord.
Cold rolling (pulling out) afterwards inhomogeneity of wall thickness changes 1(unit: the mm that sees the following form).
Table 1
The object of Light deformation amount cold-drawn is the geometrical dimension high precision ensureing steel pipe, and small deformation can reduce the frictional heating in Tube Drawing process, reduces shrinkage strain.After cold-drawn, geometrical dimension distortion is little, not easily produces the defects such as road plan.
Table 2
It is cold rolling that hollow billet after pickling, lubrication carries out aximal deformation value, Light deformation amount cold-drawn again, the pass deformation of hollow billet cold-drawn is less, a sizing reduction of cold-drawn is 6 ~ 15%, wall thickness reducing amount 0.5 ~ 1.2mm, coefficient of extension 1.30 ~ 1.40, and cold rolling pass deformation is large, cold rolling sizing reduction is once 20 ~ 30%, wall thickness reducing amount 1.5 ~ 3.0mm, and cold rolling mean coefficient of elongation can reach 2.0 ~ 3.0.The generation of equal wall effect is because the different wall on tube wall has different wall to change rolling in the process of pulling out, metal thickens many in thin-walled place when flowing, wall thickness place thickens few, and it is relevant with deflection size, the large metal flow of deflection is many, flowing is fast, and result makes thickness of steel pipe produce homogenizing, in table 1.Improve steel tube surface pit by the pressure effect of moulds of industrial equipment and the flowing of metal, slightly scratch, the shallow defects such as pit, improve steel tube surface precision, make it bright and clean.
(4) then carry out normalizing air cooling, the temperature of normalizing air cooling is 840 ~ 860 DEG C, carries out surface treatment, pre-straightening after cooling.Uniform crystal particles after normalizing, intensity is good, sees Fig. 1 and Fig. 2, grain fineness number: 8.5 grades.
(5) modified online.
In step of the present invention (3), cold roller and deformed coefficient is 1.8 ~ 2.2, and drawing deformation coefficient is 1.07 ~ 1.12.
Step of the present invention (5) is modified online comprises Quench and temper, and during quenching, 25 ~ 35 DEG C/s speed is rapidly heated to 900 ~ 920 DEG C, then once sprays with the speed of 200 ~ 220 DEG C/s and is quickly cooled to about 310 DEG C, then carries out below secondary spraying to 80 DEG C.Fig. 3 and Fig. 4 is shown in quenching.Induction heating mode is adopted to carry out modified online to steel pipe, it is good that steel pipe heating has heat penetration, rate of heating is fast, the advantage that oxide skin is thin, and the mode that steel pipe rotary advances heats and cools, homogeneous temperature, size distortion is little, ovality≤0.05mm, linearity≤1mm/m, adopt water-soluble quenching liquid cooling to make martensitic stucture change fully, do not cause steel pipe hardening crack simultaneously.Modified rear steel pipe comprehensive mechanical performance is good, and inside and outside section hardness is even, and △ HRC≤2, grain fineness number reaches 10 grades than traditional modified raising 2 grades.Steel pipe carries out essence aligning after modified cooling, aligning linearity≤0.50mm/m.
During tempering, heat-up rate 20 ~ 30 DEG C/s, is warming up to 620 ~ 640 DEG C, air cooling after insulation.Fig. 5 and Fig. 6 is seen, grain fineness number: 10 grades after tempering.
Surface treatment in step of the present invention (3), functional quality concentration be 7 ~ 24% sulfuric acid process, in 20 ~ 60 minutes treatment times, treatment temp 40 ~ 60 DEG C, carries out embathing and high pressure washing with clear water after process.
In step of the present invention (3), greasing is: first carry out phosphatization to hollow billet, and use Phosphating Solution to carry out phosphatization, General Acidity in Phosphating Solution 25 ~ 45, free acidity is 0.6 ~ 4, phosphatization temperature 65 ~ 75 DEG C, phosphating time 10 ~ 35 minutes.Then carry out saponification, the concentration fatty acid content 40 ~ 80g/L of saponification liquor, free alkali is less than 4g/L, saponification temperature 40 ~ 60 DEG C, time >=8 minutes.
The present invention compared with prior art, have the following advantages and effect: adopt and optimize the inner quality that chemical composition ensures steel pipe in the thermal treatment of its weldless steel tube and hot cold deformation processing, when making its cold deformation, plasticity is good, hollow billet after perforation thermal distortion reduces surface crack, sticks up the bad defect such as skin, absciss layer, and after final online Tempering and Quenching, comprehensive mechanical performance is excellent.
Self-joining type high strength cord of the present invention is cored drilling rod weldless steel tube, has good performance, and randomly drawing 4 groups, to carry out detecting its performance as shown in table 3 below.
Table 3
Self-joining type high strength cord of the present invention is utilized to core drilling rod weldless steel tube, the composition of raw materials chosen, adopt the tube-making process that hot and cold distortion is optimized, special heat treatment mode and surface treatment, tube product is made to have excellent comprehensive mechanical performance, high strength, good springiness, counter-bending, shock-resistant, wear-resistant, dimensional precision is high simultaneously, and inside/outside diameter size deviation is little, same section steel pipe uniform wall thickness, linearity is good, protection against corrosion attractive in appearance, is applicable to the probing demand that geological prospecting industry development of new boring tool is used for medium-length hole.
First cold rolling rear cold-drawn makes self-joining type high strength cord drilling rod weldless steel tube of coring have good size, as shown in table 4.
Table 4
Accompanying drawing explanation
Fig. 1 is 100 magnification micrographs after normalizing.
Fig. 2 is 500 magnification micrographs after normalizing.
Fig. 3 is 100 magnification micrographs after quenching.
Fig. 4 is 500 magnification micrographs after quenching.
Fig. 5 is 100 magnification micrographs after tempering.
Fig. 6 is 500 magnification micrographs after tempering.
Fig. 7 is that in the present embodiment, self-joining type high strength cord is cored the schema of manufacture method of drilling rod weldless steel tube.
Embodiment
Below by embodiment, the present invention is described in further detail, and following examples are explanation of the invention and the present invention is not limited to following examples.
See Fig. 7, in the present embodiment, the core manufacture method of drilling rod weldless steel tube of self-joining type high strength cord comprises the steps.
(1) be C:0.38 ~ 0.43% by weight percent, 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%, surplus is the pipe embryo of Fe, be placed in heating in process furnace, furnace temp is 1190 ~ 1250 DEG C.Wherein, AS+Sn+Sb+Pb+Bi≤0.035%, refers to that the weight sum of AS, Sn, Sb, Pb and Bi accounts for percentage composition≤0.035% of total amount.
(2) pipe is made hollow billet through hot-puncturing process, hot-puncturing process temperature is 1140 ~ 1200 DEG C.Optimum temps is 1170 DEG C.
(3) the cold rolling and Light deformation amount cold-drawn of pre-anneal treatment, surface treatment, lubrication, aximal deformation value is carried out successively to hollow billet; Annealing temperature 780 ~ 800 DEG C, cold roller and deformed coefficient is 1.8 ~ 2.2, and drawing deformation coefficient is 1.07 ~ 1.12.Pre-anneal treatment: heat-up rate 40 ~ 60 DEG C/min, is warming up to 780 ~ 800 DEG C, is incubated 30 ~ 40 minutes, is cooled to less than 550 DEG C air coolings of coming out of the stove in stove.
Surface treatment: functional quality concentration be 7 ~ 24% sulfuric acid process, in 20 ~ 60 minutes treatment times, treatment temp 40 ~ 60 DEG C, carries out embathing and high pressure washing with clear water after process.Its objective is and prevent steel tube surface oxide skin from causing steel tube surface load mould when aligning, affect the surface accuracy of steel pipe.
Lubrication: first carry out phosphatization to hollow billet, use Phosphating Solution to carry out phosphatization, General Acidity in Phosphating Solution 25 ~ 45, free acidity is 0.6 ~ 4, phosphatization temperature 65 ~ 75 DEG C, phosphating time 10 ~ 35 minutes.Then carry out saponification, the concentration fatty acid content 40 ~ 80g/L of saponification liquor, free alkali is less than 4g/L, saponification temperature 40 ~ 60 DEG C, time >=8 minutes.
Aximal deformation value is cold rolling: cold roller and deformed coefficient is 1.8 ~ 2.2.
Light deformation amount cold-drawn: drawing deformation coefficient is 1.07 ~ 1.12.
(4) then carry out normalizing air cooling, the temperature of normalizing air cooling is 840 ~ 860 DEG C, carries out surface treatment, pre-straightening after cooling.The object of normalizing makes homogeneous microstructure change, crystal grain thinning, eliminates internal stress, is conducive to modified rear tissue stabilization.Mechanical property after normalizing air cooling is tensile strength 680 ~ 740MPa, yield strength 450 ~ 500MPa, elongation 22 ~ 26%, homogeneous microstructure.
Normalizing air cooling: heat-up rate 55 ~ 75 DEG C/min, is warming up to 840 ~ 860 DEG C, be incubated 20 ~ 30 minutes, air cooling of then coming out of the stove is to normal temperature.
Surface treatment:
(5) modified online, first quench, 25 ~ 35 DEG C/s speed is rapidly heated to 900 ~ 920 DEG C, then once spray with the speed of 200 ~ 220 DEG C/s and be quickly cooled to about 310 DEG C, carry out below secondary spraying to 80 DEG C again, then carry out tempering, heat-up rate 20 ~ 30 DEG C/s, be warming up to 620 ~ 640 DEG C, air cooling after insulation.After cooling, essence is rectified again, destressing thermal treatment, linearity inspection.After cooling, essence is rectified again, destressing thermal treatment, linearity inspection.Modified online in induction heater to the steel pipe through pre-straightening, quench treatment adopts induction heating mode to be rapidly heated to 900 ~ 920 DEG C to weldless steel tube with 25 ~ 35 DEG C/s speed, then once spray with the speed of 200 ~ 220 DEG C/s and be quickly cooled to about 310 DEG C, carry out below secondary spraying to 80 DEG C again, heat-eliminating medium is the water-soluble quenching liquid of 5 ~ 8%.Rotary heating and spray, then carry out tempering in the mode of induction heating to steel pipe, heat-up rate 20 ~ 30 DEG C/s, tempering temperature 620 ~ 640 DEG C, air cooling.Induction heating mode is adopted to carry out modified online to steel pipe, it is good that steel pipe heating has heat penetration, rate of heating is fast, the advantage that oxide skin is thin, and the mode that steel pipe rotary advances heats and cools, homogeneous temperature, size distortion is little, ovality≤0.05mm, linearity≤1mm/m, adopt water-soluble quenching liquid cooling to make martensitic stucture change fully, do not cause steel pipe hardening crack simultaneously.Modified rear steel pipe comprehensive mechanical performance is good, and inside and outside section hardness is even, and △ HRC≤2, grain fineness number reaches 10 grades than traditional modified raising 2 grades.
Steel pipe carries out essence aligning after modified cooling, aligning linearity≤0.50mm/m.
Steel pipe carries out induction heating destressing thermal treatment after aligning, and its objective is the aligning stress produced after eliminating aligning, reduce pipe deformation, destressing temperature is 580 ~ 610 DEG C, heat-up rate 20 ~ 25 DEG C/s.Before and after destressing, the contrast of sample subdivision is as shown in table 5, specimen length 250mm(unit: mm).
Table 5
Sample contrast shows, adopt rotation mode destressing thermal treatment after aligning, the internal stress of steel pipe is effectively discharged, and deformation values diminishes rapidly, is kept through the original aligning linearity of Linearity surveying.
(6) rectify through essence, destressing thermal treatment, carry out crop end, non-destructive test(ing)(NDT), inspection, surperficial antirust treatment, packaging after linearity inspection.Steel pipe after testing carries out surperficial Black Phosphating Process process, and to improve visual appearance, rust-proof life reaches half a year more than.
Above content described in this specification sheets is only made for the present invention illustrating.Those skilled in the art can make various amendment or supplement or adopt similar mode to substitute to described specific embodiment; only otherwise depart from the content of specification sheets of the present invention or surmount this scope as defined in the claims, protection scope of the present invention all should be belonged to.

Claims (1)

1. self-joining type high strength cord is cored a manufacture method for drilling rod weldless steel tube, it is characterized in that:
Described self-joining type high strength cord drilling rod weldless steel tube of coring comprises the component of following weight per-cent: 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%, surplus is Fe; Content sum≤0.035% of AS, Sn, Sb, Pb and Bi;
Described manufacture method comprises the steps:
(1) be C:0.38 ~ 0.43% by weight percent, 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%, surplus is the pipe embryo of Fe, be placed in heating in process furnace, furnace temp is 1190 ~ 1250 DEG C;
(2) pipe is made hollow billet through hot-puncturing process, hot-puncturing process temperature is 1140 ~ 1200 DEG C;
(3) the cold rolling and Light deformation amount cold-drawn of pre-anneal treatment, surface treatment, lubrication, aximal deformation value is carried out successively to hollow billet; Annealing temperature 780 ~ 800 DEG C;
(4) then carry out normalizing air cooling, the temperature of normalizing air cooling is 840 ~ 860 DEG C, carries out surface treatment, pre-straightening after cooling;
(5) modified online;
In described step (3), cold roller and deformed coefficient is 1.8 ~ 2.2, and drawing deformation coefficient is 1.07 ~ 1.12;
Step (5) is modified online comprises Quench and temper, during quenching, 25 ~ 35 DEG C/s speed is rapidly heated to 900 ~ 920 DEG C, then once spray with the speed of 200 ~ 220 DEG C/s and be quickly cooled to 310 DEG C, carry out below secondary spraying to 80 DEG C again, during tempering, heat-up rate 20 ~ 30 DEG C/s, is warming up to 620 ~ 640 DEG C, air cooling after insulation;
Surface treatment in described step (3), functional quality concentration be 7 ~ 24% sulfuric acid process, in 20 ~ 60 minutes treatment times, treatment temp 40 ~ 60 DEG C, carries out embathing and high pressure washing with clear water after process;
In described step (3), greasing is: first carry out phosphatization to hollow billet, and use Phosphating Solution to carry out phosphatization, General Acidity in Phosphating Solution 25 ~ 45, free acidity is 0.6 ~ 4, phosphatization temperature 65 ~ 75 DEG C, phosphating time 10 ~ 35 minutes; Then carry out saponification, the concentration fatty acid content 40 ~ 80g/L of saponification liquor, free alkali is less than 4g/L, saponification temperature 40 ~ 60 DEG C, time >=8 minutes.
CN201310230066.5A 2013-06-09 2013-06-09 A kind of self-joining type high strength cord is cored the manufacture method of drilling rod weldless steel tube CN103276297B (en)

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Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101410194A (en) * 2006-03-29 2009-04-15 住友金属工业株式会社 Cold finish seamless steel pipe for drive shaft and method for producing the same
CN102953019A (en) * 2012-09-25 2013-03-06 无锡润丰特种钢管有限公司 Alloy steel seamless steel tube for geological drilling and machining method thereof

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