CN103643124B - The working method of the above High Strength Steel Bar joint sleeve of a kind of 600MPa level - Google Patents
The working method of the above High Strength Steel Bar joint sleeve of a kind of 600MPa level Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 91
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 83
- 239000010959 steel Substances 0.000 title claims abstract description 83
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 16
- 239000002994 raw material Substances 0.000 claims abstract description 12
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 10
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 10
- 239000000203 mixture Substances 0.000 claims abstract description 10
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 10
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 10
- 239000000126 substance Substances 0.000 claims abstract description 10
- 238000001816 cooling Methods 0.000 claims description 47
- 230000003014 reinforcing effect Effects 0.000 claims description 21
- 238000010791 quenching Methods 0.000 claims description 12
- 238000005496 tempering Methods 0.000 claims description 12
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 8
- 239000004567 concrete Substances 0.000 claims description 7
- 230000000171 quenching effect Effects 0.000 claims description 7
- 239000007789 gas Substances 0.000 claims description 6
- 239000000314 lubricant Substances 0.000 claims description 6
- 238000003825 pressing Methods 0.000 claims description 6
- 230000006835 compression Effects 0.000 claims description 5
- 238000007906 compression Methods 0.000 claims description 5
- 238000005520 cutting process Methods 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 5
- 238000004806 packaging method and process Methods 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 238000001125 extrusion Methods 0.000 claims description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 10
- 238000005260 corrosion Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000006104 solid solution Substances 0.000 description 2
- 229910052720 vanadium Inorganic materials 0.000 description 2
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 2
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000011372 high-strength concrete Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000010451 perlite Substances 0.000 description 1
- 235000019362 perlite Nutrition 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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- Reinforcement Elements For Buildings (AREA)
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Abstract
The invention discloses the working method of the above High Strength Steel Bar joint sleeve of a kind of 600MPa level, No. 45 round steel are selected to be raw material, the weight percent chemical composition of described No. 45 round steel is: C:0.38-0.43%, Cr:0.8-1.1%, Mn:0.75-1.0%, Mo:0.15-0.25%, Si:0.15-0.3%, S:<0.035%, P:<0.035%, N:<0.035%, surplus is Fe; The working method of the above High Strength Steel Bar joint sleeve of a kind of 600MPa level designed by the present invention substantially increases tensile strength and unit elongation, and can ensure outside dimension and the smooth finish of steel pipe, alleviates screw tap and sleeve lining friction stress.
Description
Technical field
The present invention relates to the working method of the above High Strength Steel Bar joint sleeve of a kind of 600MPa level.
Background technology
Country's Iron And Steel Industry " 12 " planning proposes " accelerating to eliminate 335 MPa level Twisted Steels " " strengthen the research of High Strength Steel Bar and High Strength Concrete Structures component anti-seismic performance, carry out 600 MPa levels and above Twisted Steel research and development of products ".Lay special stress on accelerates the research of 600MPa level and above bar connecting.
Up to the present, commercially there is not batch production and sell in the joint sleeve of 600MPa level and above reinforcing bar, mainly due to present material No. 45 steel producing the joint sleeve of high strength cast iron, its tensile strength only has 610MPa, and 1.1 times that do not reach High Strength Steel Bar sleeve design principle intensity is 830MPa; Simultaneously, the JGJ163-2013 standard " steel concrete supporting sleeve " of new appearance defines the requirement that raw-material unit elongation is greater than 14%, comprehensive above-mentioned all factors, must have the sleeve starting material of a kind of cost lower (prices lower than No. 45 steel pipes), high strength (tensile strength is greater than 830MPa), high-ductility (unit elongation is greater than 14%) to produce the sleeve of High Strength Steel Bar.
Summary of the invention
Technical problem to be solved by this invention is, overcome the shortcoming of prior art, there is provided one can substantially increase tensile strength and unit elongation, and outside dimension and the smooth finish of steel pipe can be ensured, alleviate the working method of the above High Strength Steel Bar joint sleeve of 600MPa level of screw tap and sleeve lining friction stress.
In order to solve above technical problem, the invention provides the working method of the above High Strength Steel Bar joint sleeve of a kind of 600MPa level, comprising following concrete steps:
Step (1): select No. 45 round steel to be raw material, the weight percent chemical composition of No. 45 round steel is: C:0.38-0.43%, Cr:0.8-1.1%, Mn:0.75-1.0%, Mo:0.15-0.25%, Si:0.15-0.3%, S:<0.035%, P:<0.035%, N:<0.035%, surplus is Fe, above-mentioned raw materials is sent into process furnace and is heated to 1100-1180 DEG C, and drawing is the steel pipe of desired size;
Step (2): reinforcing bar fast speed is cooled to 610-630 DEG C through online first refrigerating work procedure by the steel pipe after heating in step (1), then in quenching device with water or hardening liquid carry out for time 11-13 quench second, then 600-660 DEG C of tempering is heated to through tempering process furnace, and after carrying out alignment process, then be cooled to normal temperature by the second process for cooling;
Step (3): the steel pipe being cooled to room temperature in step (2) is sent in process furnace and is heated to 810-910 DEG C, and by the steel pipe that heats with speed of cooling cool to room temperature in rare gas element of 1-3 per second DEG C;
Step (4): above-mentioned steel pipe is cut into desired length by automatic cutting off table, form sleeve blank, equal channel angular pressing sleeve blank being carried out after the extrusion process that amount of compression is 5-10% 6 or 12 equal portions is again molded, forms sleeve work in-process;
Step (5): the sleeve work in-process in step (4) are carried out arch wire process, makes its endoporus with 2.5 or the screw thread at 75 degree of angles of 3mm tooth pitch, in arch wire process, adds rust-proofing lubricant;
Step (6): finally sleeve outer wall is fallen packaging warehouse-in after miter angle.
The technical scheme that the present invention limits further is:
Further, the working method of the above High Strength Steel Bar joint sleeve of aforesaid 600MPa level, the weight percent chemical composition of No. 45 round steel is C:0.38%, Cr:1.1%, Mn:0.75%, Mo:0.25%, Si:0.21%, S:0.025%, P:0.03%, N:0.025%, surplus is Fe.
The working method of the above High Strength Steel Bar joint sleeve of aforesaid 600MPa level, the weight percent chemical composition of No. 45 round steel is C:0.43%, Cr:0.9%, Mn:0.85%, Mo:0.2%, Si:0.3%, S:0.013%, P:0.015%, N:0.012%, surplus is Fe.
The working method of the above High Strength Steel Bar joint sleeve of aforesaid 600MPa level, the refrigerating work procedure in step (2) is specially:
Described first refrigerating work procedure: adopt water-cooled with the rate of cooling of 15-17 DEG C/s by reinforcing bar water-cooled to 610-630 DEG C;
Described second refrigerating work procedure: adopt water-cooled to be combined with air cooling, first adopt water-cooled with the rate of cooling of 1-2 DEG C/s by reinforcing bar water-cooled to 320-350 DEG C, then air cooling is to 250-280 DEG C, then adopt water-cooled with the rate of cooling of 3-5 DEG C/s by reinforcing bar water-cooled to 210-230 DEG C, last air cooling is to room temperature.
The working method of the above High Strength Steel Bar joint sleeve of aforesaid 600MPa level, the rare gas element in step (3) is nitrogen.
The invention has the beneficial effects as follows:
The present invention with No. 45 steel for blank, the toughness of steel, elasticity, wear resistance can be improved and resist performance, and make steel tight, and the vanadium in steel is highly stable, not easily by hydrochloric acid, sulfuric acid decompose, add the steel hardenability after vanadium good, the whole cross section of steel part can be made to obtain the mechanical property of uniformity and the quenching medium that steel part quenching stress is little can be selected, to reduce distortion and cracking;
Nickel element is added in the present invention, firm intensity and toughness can be improved, improve the hardening capacity of steel, some physicalies of steel can be changed, and improve the resistance to corrosion of steel, thus the atom active of C and N element can be improved, the air mass that each atom is formed can form strong interaction with dislocation, pinning dislocation, produces yield point elongation, and making needs the external world to provide larger stress just can start dislocation;
The present invention cools the generation being conducive to promoting perlite ratio under certain speed of cooling, and to reach between intensity with plasticity organic coordinates for controlled cooling model speed, and make tensile strength be greater than 750MPa, unit elongation is greater than more than 16%;
In the present invention, the steel pipe after heating is cooled in rare gas element is as N gas, prevent steel pipe from process of cooling, producing more iron scale, ensure the outside dimension of steel pipe and the requirement of smooth finish;
Water-cooled is adopted to be combined with air cooling after tempering of the present invention, be followed successively by: water-cooled-air cooling-water-cooled-air cooling, like this, controlled by the cooling after tempering, carbide can be made fully to dissolve further, even diffusion, avoiding carbide causes intergranular corrosion and spot corrosion to exceed standard in the precipitation of intergranular, ensure that the ferrite content of material is about 30%, material solid solution can be made further abundant, avoid heat treatment mode heating uneven, the erosion rate that solid solution inequality is brought exceeds standard and hardness exceeds standard, and has consolidated the technique effect smelted postheat treatment technique above and produce.
The present invention, by the sleeve of 5-10% Equal Channel Angular Pressing, makes sleeve form inside racking stress, impels sleeve work hardening, under the condition of slightly losing ductility, significantly improves tensile strength to more than 850MPa, meets the design requirements of 600MPa level sleeve;
The present invention adopts rust-proofing lubricant in arch silk process, and the screw thread being conducive to sleeve lining is antirust for a long time, also plays simultaneously and alleviates screw tap and sleeve lining friction stress.
Embodiment
embodiment 1
The working method of the above High Strength Steel Bar joint sleeve of a kind of 600MPa level that the present embodiment provides, comprises following concrete steps:
Step (1): select No. 45 round steel to be raw material, the weight percent chemical composition of No. 45 round steel is C:0.38%, Cr:1.1%, Mn:0.75%, Mo:0.25%, Si:0.21%, S:0.025%, P:0.03%, N:0.025%, surplus is Fe, above-mentioned raw materials is sent into process furnace and is heated to 1100 DEG C, and drawing is the steel pipe of desired size;
Step (2): reinforcing bar fast speed is cooled to 610 DEG C through online first refrigerating work procedure by the steel pipe after heating in step (1), then in quenching device with water or hardening liquid carry out for time 11-13 quench second, then 600 DEG C of tempering are heated to through tempering process furnace, and after carrying out alignment process, be cooled to normal temperature by the second process for cooling again, concrete process for cooling is:
Described first refrigerating work procedure: adopt water-cooled with the rate of cooling of 15-17 DEG C/s by reinforcing bar water-cooled to 610 DEG C;
Described second refrigerating work procedure: adopt water-cooled to be combined with air cooling, first adopt water-cooled with the rate of cooling of 1-2 DEG C/s by reinforcing bar water-cooled to 320 DEG C, then air cooling to 250 DEG C, then adopt water-cooled with the rate of cooling of 3-5 DEG C/s by reinforcing bar water-cooled to 210 DEG C, last air cooling is to room temperature;
Step (3): the steel pipe being cooled to room temperature in step (2) is sent in process furnace and is heated to 810 DEG C, and by the steel pipe that heats with speed of cooling cool to room temperature in nitrogen of 1-3 per second DEG C;
Step (4): above-mentioned steel pipe is cut into desired length by automatic cutting off table, form sleeve blank, equal channel angular pressing sleeve blank being carried out after the amount of compression of 5-10% 6 or 12 equal portions is molded, forms sleeve work in-process;
Step (5): the sleeve work in-process in step (4) are carried out arch wire process, makes its endoporus with 2.5 or the screw thread at 75 degree of angles of 3mm tooth pitch, in arch wire process, adds rust-proofing lubricant;
Step (6): finally sleeve outer wall is fallen packaging warehouse-in after miter angle.
embodiment 2
The working method of the above High Strength Steel Bar joint sleeve of a kind of 600MPa level that the present embodiment provides, comprises following concrete steps:
Step (1): select No. 45 round steel to be raw material, the weight percent chemical composition of No. 45 round steel is C:0.43%, Cr:0.9%, Mn:0.85%, Mo:0.2%, Si:0.3%, S:0.013%, P:0.015%, N:0.012%, surplus is Fe, above-mentioned raw materials is sent into process furnace and is heated to 1180 DEG C, and drawing is the steel pipe of desired size;
Step (2): reinforcing bar fast speed is cooled to 630 DEG C through online first refrigerating work procedure by the steel pipe after heating in step (1), then in quenching device with water or hardening liquid carry out for time 11-13 quench second, then 660 DEG C of tempering are heated to through tempering process furnace, and after carrying out alignment process, be cooled to normal temperature by the second process for cooling again, refrigerating work procedure is specially:
Described first refrigerating work procedure: adopt water-cooled with the rate of cooling of 15-17 DEG C/s by reinforcing bar water-cooled to 630 DEG C;
Described second refrigerating work procedure: adopt water-cooled to be combined with air cooling, first adopt water-cooled with the rate of cooling of 1-2 DEG C/s by reinforcing bar water-cooled to 350 DEG C, then air cooling to 280 DEG C, then adopt water-cooled with the rate of cooling of 3-5 DEG C/s by reinforcing bar water-cooled to 230 DEG C, last air cooling is to room temperature;
Step (3): the steel pipe being cooled to room temperature in step (2) is sent in process furnace and is heated to 910 DEG C, and by the steel pipe that heats with speed of cooling cool to room temperature in nitrogen of 1-3 per second DEG C;
Step (4): above-mentioned steel pipe is cut into desired length by automatic cutting off table, form sleeve blank, equal channel angular pressing sleeve blank being carried out after the extrusion process that amount of compression is 5-10% 6 or 12 equal portions is again molded, forms sleeve work in-process;
Step (5): the sleeve work in-process in step (4) are carried out arch wire process, makes its endoporus with 2.5 or the screw thread at 75 degree of angles of 3mm tooth pitch, in arch wire process, adds rust-proofing lubricant;
Step (6): finally sleeve outer wall is fallen packaging warehouse-in after miter angle.
embodiment 3
The working method of the above High Strength Steel Bar joint sleeve of a kind of 600MPa level that the present embodiment provides, comprises following concrete steps:
Step (1): select No. 45 round steel to be raw material, the weight percent chemical composition of No. 45 round steel is: C:0.41%, Cr:0.8%, Mn:1.0%, Mo:0.15%, Si:0.15%, S:0.015%, P:0.025%, N:0.015%, surplus is Fe, above-mentioned raw materials is sent into process furnace and is heated to 1150 DEG C, and drawing is the steel pipe of desired size;
Step (2): reinforcing bar fast speed is cooled to 620 DEG C through online first refrigerating work procedure by the steel pipe after heating in step (1), then in quenching device with water or hardening liquid carry out for time 11-13 quench second, then 640 DEG C of tempering are heated to through tempering process furnace, and after carrying out alignment process, be cooled to normal temperature by the second process for cooling again, refrigerating work procedure is specially:
Described first refrigerating work procedure: adopt water-cooled with the rate of cooling of 15-17 DEG C/s by reinforcing bar water-cooled to 620 DEG C;
Described second refrigerating work procedure: adopt water-cooled to be combined with air cooling, first adopt water-cooled with the rate of cooling of 1-2 DEG C/s by reinforcing bar water-cooled to 330 DEG C, then air cooling to 260 DEG C, then adopt water-cooled with the rate of cooling of 3-5 DEG C/s by reinforcing bar water-cooled to 220 DEG C, last air cooling is to room temperature;
Step (3): the steel pipe being cooled to room temperature in step (2) is sent in process furnace and is heated to 880 DEG C, and by the steel pipe that heats with speed of cooling cool to room temperature in nitrogen of 1-3 per second DEG C;
Step (4): above-mentioned steel pipe is cut into desired length by automatic cutting off table, form sleeve blank, equal channel angular pressing sleeve blank being carried out after the extrusion process that amount of compression is 5-10% 6 or 12 equal portions is again molded, forms sleeve work in-process;
Step (5): the sleeve work in-process in step (4) are carried out arch wire process, makes its endoporus with 2.5 or the screw thread at 75 degree of angles of 3mm tooth pitch, in arch wire process, adds rust-proofing lubricant;
Step (6): finally sleeve outer wall is fallen packaging warehouse-in after miter angle.
In addition to the implementation, the present invention can also have other embodiments, and all employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of application claims.
Claims (4)
1. a working method for the above High Strength Steel Bar joint sleeve of 600MPa level, is characterized in that, comprise following concrete steps:
Step (1): select No. 45 round steel to be raw material, the weight percent chemical composition of described No. 45 round steel is: C:0.38-0.43%, Cr:0.8-1.1%, Mn:0.75-1.0%, Mo:0.15-0.25%, Si:0.15-0.3%, S:<0.035%, P:<0.035%, N:<0.035%, surplus is Fe, above-mentioned raw materials is sent into process furnace and is heated to 1100-1180 DEG C, and drawing is the steel pipe of desired size;
Step (2): reinforcing bar fast speed is cooled to 610-630 DEG C through online first refrigerating work procedure by the steel pipe after heating in step (1), then in quenching device with water or hardening liquid carry out for time 11-13 quench second, then 600-660 DEG C of tempering is heated to through tempering process furnace, and after carrying out alignment process, then be cooled to normal temperature by the second process for cooling;
First, second refrigerating work procedure described is specially:
Described first refrigerating work procedure: adopt water-cooled with the rate of cooling of 15-17 DEG C/s by reinforcing bar water-cooled to 610-630 DEG C;
Described second refrigerating work procedure: adopt water-cooled to be combined with air cooling, first adopt water-cooled with the rate of cooling of 1-2 DEG C/s by reinforcing bar water-cooled to 320-350 DEG C, then air cooling is to 250-280 DEG C, then adopt water-cooled with the rate of cooling of 3-5 DEG C/s by reinforcing bar water-cooled to 210-230 DEG C, last air cooling is to room temperature;
Step (3): the steel pipe being cooled to room temperature in step (2) is sent in process furnace and is heated to 810-910 DEG C, and by the steel pipe that heats with speed of cooling cool to room temperature in rare gas element of 1-3 per second DEG C;
Step (4): above-mentioned steel pipe is cut into desired length by automatic cutting off table, form sleeve blank, equal channel angular pressing sleeve blank being carried out after the extrusion process that amount of compression is 5-10% 6 or 12 equal portions is again molded, forms sleeve work in-process;
Step (5): the sleeve work in-process in step (4) are carried out arch wire process, makes its endoporus with 2.5 or the screw thread at 75 degree of angles of 3mm tooth pitch, in arch wire process, adds rust-proofing lubricant;
Step (6): finally sleeve outer wall is fallen packaging warehouse-in after miter angle.
2. the working method of the above High Strength Steel Bar joint sleeve of 600MPa level according to claim 1, it is characterized in that, the weight percent chemical composition of described No. 45 round steel is C:0.38%, Cr:1.1%, Mn:0.75%, Mo:0.25%, Si:0.21%, S:0.025%, P:0.03%, N:0.025%, surplus is Fe.
3. the working method of the above High Strength Steel Bar joint sleeve of 600MPa level according to claim 1, it is characterized in that, the weight percent chemical composition of described No. 45 round steel is C:0.43%, Cr:0.9%, Mn:0.85%, Mo:0.2%, Si:0.3%, S:0.013%, P:0.015%, N:0.012%, surplus is Fe.
4. the working method of the above High Strength Steel Bar joint sleeve of 600MPa level according to claim 1, is characterized in that, the rare gas element in described step (3) is nitrogen.
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| CN104372951A (en) * | 2014-11-08 | 2015-02-25 | 江苏天舜金属材料集团有限公司 | Processing method for chrome molybdenum low alloy prestressed steel reinforcement connection joint |
| CN104328346A (en) * | 2014-11-08 | 2015-02-04 | 江苏天舜金属材料集团有限公司 | Processing process of wear-resisting anti-impact type pile foundation steel protective barrel |
| CN106425302B (en) * | 2016-10-27 | 2018-08-28 | 中国航空工业集团公司洛阳电光设备研究所 | A kind of processing method of conical thin-wall part vehicle high-axiality sealing screw thread |
| CN108942106B (en) * | 2018-08-11 | 2022-06-24 | 湖北博士隆科技有限公司 | Production and processing method of aluminum sleeve |
| CN108907631A (en) * | 2018-08-23 | 2018-11-30 | 江苏华太电力仪表有限公司 | A kind of preparation process of high temperature resistant leakage-free ball valve spool |
| CN111187986A (en) * | 2020-02-18 | 2020-05-22 | 山东钢铁股份有限公司 | Low-alloy high-strength sleeve for connecting high-strength steel bars and preparation method thereof |
| CN115261720B (en) * | 2022-06-29 | 2023-05-05 | 张家港荣盛特钢有限公司 | Fireproof steel bar mechanical connecting sleeve, wire rod and production method of wire rod |
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| JPS6056222B2 (en) * | 1978-02-08 | 1985-12-09 | 大同特殊鋼株式会社 | Sleeve for joining reinforcing bars |
| CN1391020A (en) * | 2001-06-07 | 2003-01-15 | 天津钢管公司 | Medium-strength sleeved petroleum pipe for hot recovery well of thick oil and its making method |
| CN1164786C (en) * | 2001-12-13 | 2004-09-01 | 宋仁祯 | XY30 steel and its application |
| CN201614694U (en) * | 2010-03-23 | 2010-10-27 | 武钢集团昆明钢铁股份有限公司 | Sleeve for connecting high-strength hot-rolled ribbed steel bars |
| CN102267040B (en) * | 2011-06-16 | 2012-10-03 | 张家港市逸洋制管有限公司 | Preparation method for stainless steel bearing steel tube and ferrule |
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