CN105986190A - High-strength high-toughness pipe for crane boom and manufacturing method for high-strength high-toughness pipe - Google Patents
High-strength high-toughness pipe for crane boom and manufacturing method for high-strength high-toughness pipe Download PDFInfo
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- CN105986190A CN105986190A CN201510087549.3A CN201510087549A CN105986190A CN 105986190 A CN105986190 A CN 105986190A CN 201510087549 A CN201510087549 A CN 201510087549A CN 105986190 A CN105986190 A CN 105986190A
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Abstract
The invention provides a high-strength high-toughness pipe for a crane boom. The high-strength high-toughness pipe consists of the following components in percentage by mass: 0.14-0.18% of C, 0.30-0.50% of Si, 1.30-1.50% of Mn, less than or equal to 0.015% of P, less than or equal to 0.008% of S, 0.35-0.50% of Cr, 0.10-0.20% of Ni, 0.25-0.38% of Mo, 0.07-0.12% of V, less than or equal to 0.05% of Ti, 0.30-0.45% of W, 0.02-0.05% of Al, less than or equal to 0.02% of Cu, less than or equal to 0.05% of Nb, less than or equal to 0.007% of N, and the balance iron and impurities. Ferrotitanium is added 5-8 minutes before ending external refining. A pipe blank heating temperature ranges from 1260 DEG C to 1280 DEG C; a steel pipe quenching temperature ranges from 920 DEG C to 930 DEG C, a tempering temperature ranges from 690 DEG C to 700 DEG C, and thermal insulation time ranges from 40 minutes to 60 minutes. The process is simple and easy to realize; the boom is welded and judged according to the technical requirements of standard Pressure-bearing Equipment Welding Procedure Qualification NB/T47014-2011; bending tests such as a room-temperature tensile test, a lateral bending test, a surface bending test and a back bending test as well as a low-temperature impact test at (-)40 DEG C of the boom are qualified; and moreover, production performances are uniform and stability is good.
Description
Technical field
The invention belongs to metallurgical technology technical field, particularly to a kind of high-intensity high-tenacity crane arm support seamless steel pipe and
Manufacture method.
Background technology
Lifting industry is one of basic industries important in the development of the national economy.Hydraulic crawler crane is that a kind of skyscraper is executed
The mobile crane of work, is with high content of technology in engineering machinery, and manufacturing process is complicated, the hoisting operation of unique energy
Machinery, it is relatively large that it has elevating capacity, and radius of turn is little, and overline capable of hoisting is walked, and crawler belt is less, to environmental requirement than pressure to ground
Low, job stabilization is good, truss combination can the feature such as free replacing, thus be widely used in building bridge, install generating equipment,
Refining equipment is installed, sets up wind power generating set and build the projects under construction such as offshore work platform.Crawler crane boom has been
The critical component of heavy-duty machine, its use condition requires seamless steel pipe high intensity to be had and high tenacity, requires have well simultaneously
Welding performance.In recent years, along with the reinforcement of China's infrastructure construction, especially Three Gorges Projects, Qinghai-Tibet Railway, transfering natural gas from the west to the east,
Under the pulling that the industries such as transferring electricity from the west to the east develop rapidly, domestic crawler crane is commercially available continue, quickly grow.At present, I
The domestic only Baosteel of state's crane arm support high tensile steel tube, climb into several the steel tube factories such as steel, Hengyang steel pipe and can produce.
Industrially-advanced country the most progressively uses such as ASTMA514 series, DIN STE series, WEL TEN series to be generation in the world
The high-strength welding structure steel making crawler crane boom of table.These steel grades be all add on the basis of low carbon manganese steel appropriate Cr,
The microalloy elements such as Ni, Mo, V, Nb, Ti form.It is domestic that once someone used the Cr-Ni-Mn-Mo-V-B with good low-carbon (LC)
High intensity jib pipe manufactured experimently by steel alloy, but batch does not puts into production and uses.
Summary of the invention
The purpose of the present invention aims to provide a kind of seamless steel of crane arm support with high intensity, high tenacity and good welds performance
Pipe and manufacture method thereof.
To this end, the solution that the present invention is taked is:
A kind of high-strength and high-ductility crane gib arm rack pipe, its chemical composition mass percentage content is:
C 0.14～0.18%, Si 0.30～0.50%, Mn 1.30～1.50%, P≤0.015%, S≤0.008%, Cr 0.35～
0.50%, Ni 0.10～0.20%, Mo 0.25～0.38%, V 0.07～0.12%, Ti≤0.05%, W 0.30～0.45%,
Al 0.02～0.05%, Cu≤0.02%, Nb≤0.05%, N≤0.007%, Yu Weitie and impurity.
A kind of manufacture method of high-strength and high-ductility crane gib arm rack pipe, it is characterised in that:
(1) process route
Use molten iron pretreatment → converter smelting → LF+VD external refining → continuous casting and rolling → hot rolling → heat treatment → defects detecting technology.
(2) external refining
Refine terminates front 5～8min interpolation ferrotianiums.
(3) hot rolling technology
Heating of pipe blank temperature 1260～1280 DEG C；Tandem rolling selects surface zero defect mandrel rolling, and uses graphite lubrication；Sizing makes
Use high-pressure water descaling.
(4) Technology for Heating Processing
Hardening and tempering process: hardening heat 920～930 DEG C, makes the abundant austenitizing of steel pipe, and shrend ensures steel pipe rotary wheel centrage water
Flat；Temperature 690～700 DEG C, temperature retention time 40～60min.
The invention have the benefit that
1, present invention process is reasonable, and steel is pure, field trash is few, and steel pipe physical dimension is good, stable performance.
2, the product of the present invention requires to weld according to standard NB/T47014-2011 " bearing device qualification of welding procedure " technology
Judging, result shows, after weld formation, the inspection of its room temperature tensile is qualified for steel pipe, and lateral bending, face is curved, it is qualified to carry on the back the bend test such as curved,
-40 DEG C of low-temperature impacts are qualified.
3, the manufacturing process of product of the present invention is simple, it is easy to accomplish, the jib pipe microscopic structure after heat treatment is tempered sorbite,
Properties of product uniformity is good.
Accompanying drawing explanation
Fig. 1 is the crane arm support pipe micro-organization chart after heat treatment.
Detailed description of the invention
Embodiment 1:
High-strength and high-ductility crane gib arm rack pipe chemical composition mass percentage content is:
C 0.15%, Si0.50%, Mn 1.40%, P 0.010%, S 0.008%, Cr 0.46%, Ni 0.13%, Mo 0.34%,
V 0.08%, Ti≤0.05%, W 0.40%, Al 0.042%, Cu≤0.02%, Nb≤0.05%, N≤0.007%, Yu Weitie and
Impurity.
Process route: employing molten iron pretreatment → converter smelting → LF+VD external refining → continuous casting and rolling → hot rolling → heat treatment →
Defects detecting technology.
External refining: refine terminates front 6min and adds ferrotianium.
Hot rolling technology: heating of pipe blank temperature 1265 DEG C；Tandem rolling selects surface zero defect mandrel rolling, and uses graphite lubrication；Fixed
Footpath uses high-pressure water descaling.
Technology for Heating Processing: modifier treatment: hardening heat 930 DEG C, makes the abundant austenitizing of steel pipe, and shrend ensures steel pipe rotary wheel
Centrage level；Temperature 698 DEG C, temperature retention time 50min.
Embodiment 2:
High-strength and high-ductility crane gib arm rack pipe, its chemical composition mass percentage content is:
C 0.17%, Si 0.35%, Mn 1.30%, P 0.013%, S 0.005%, Cr 0.40%, Ni 0.20%, Mo 0.28%,
V 0.12%, Ti≤0.05%, W 0.34%, Al 0.03%, Cu≤0.02%, Nb≤0.05%, N≤0.007%, Yu Weitie and
Impurity.
Process route: employing molten iron pretreatment → converter smelting → LF+VD external refining → continuous casting and rolling → hot rolling → heat treatment →
Defects detecting technology.
External refining: refine terminates front 8min and adds ferrotianium.
Hot rolling technology: heating of pipe blank temperature 1275 DEG C；Tandem rolling selects surface zero defect mandrel rolling, and uses graphite lubrication；Fixed
Footpath uses high-pressure water descaling.
Technology for Heating Processing: modifier treatment: hardening heat 925 DEG C, makes the abundant austenitizing of steel pipe, and shrend ensures steel pipe rotary wheel
Centrage level；Temperature 693 DEG C, temperature retention time 60min.
Claims (2)
1. a high-strength and high-ductility crane gib arm rack pipe, it is characterised in that its chemical composition mass percent
Content is:
C 0.14～0.18%, Si 0.30～0.50%, Mn 1.30～1.50%, P≤0.015%, S≤0.008%,
Cr 0.35～0.50%, Ni 0.10～0.20%, Mo 0.25～0.38%, V 0.07～0.12%, Ti≤0.05%,
W 0.30～0.45%, Al 0.02～0.05%, Cu≤0.02%, Nb≤0.05%, N≤0.007%, Yu Wei
Ferrum and impurity.
2. a manufacture method for high-strength and high-ductility crane gib arm rack pipe as claimed in claim 1, its feature
It is:
(1) process route
Use molten iron pretreatment → converter smelting → LF+VD external refining → continuous casting and rolling → hot rolling → heat treatment
→ defects detecting technology；
(2) external refining
Refine terminates front 5～8min interpolation ferrotianiums；
(3) hot rolling technology
Heating of pipe blank temperature 1260～1280 DEG C；Tandem rolling selects surface zero defect mandrel rolling, and uses stone
Ink lubrication；Sizing uses high-pressure water descaling；
(4) Technology for Heating Processing
Hardening and tempering process: hardening heat 920～930 DEG C, makes the abundant austenitizing of steel pipe, and shrend ensures steel
Pipe rotates wheel centrage level；Temperature 690～700 DEG C, temperature retention time 40～60min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510087549.3A CN105986190A (en) | 2015-02-25 | 2015-02-25 | High-strength high-toughness pipe for crane boom and manufacturing method for high-strength high-toughness pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510087549.3A CN105986190A (en) | 2015-02-25 | 2015-02-25 | High-strength high-toughness pipe for crane boom and manufacturing method for high-strength high-toughness pipe |
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| Publication Number | Publication Date |
|---|---|
| CN105986190A true CN105986190A (en) | 2016-10-05 |
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| CN201510087549.3A Pending CN105986190A (en) | 2015-02-25 | 2015-02-25 | High-strength high-toughness pipe for crane boom and manufacturing method for high-strength high-toughness pipe |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106566986A (en) * | 2016-11-10 | 2017-04-19 | 武汉钢铁股份有限公司 | High surface quality hot rolled steel plate used for manufacturing swing arm of excavator, and manufacturing method thereof |
| CN106702270A (en) * | 2016-11-10 | 2017-05-24 | 武汉钢铁股份有限公司 | Thick-specification high-surface-quality hot-rolling and straightening steel sheet and manufacturing method thereof |
| CN110157985A (en) * | 2019-05-31 | 2019-08-23 | 张家港华程机车精密制管有限公司 | Steel plate for crawler crane string abdomen arm and hot hardening and tempering process that it is carried out |
| CN113151635A (en) * | 2021-03-30 | 2021-07-23 | 江苏永钢集团有限公司 | Production process of steel pipe for crane boom |
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| EP1218559B1 (en) * | 1999-08-30 | 2003-05-21 | V & M Deutschland GmbH | Use of a steel alloy for producing high-tensile seamless steel tubes |
| JP2008013808A (en) * | 2006-07-05 | 2008-01-24 | Jfe Steel Kk | High-tensile-strength welded steel pipe for automotive structural member, and manufacturing method therefor |
| CN101177761A (en) * | 2007-12-03 | 2008-05-14 | 衡阳华菱钢管有限公司 | Crane gib arm rack pipe and manufacturing method |
| JP2008266780A (en) * | 2007-03-29 | 2008-11-06 | Jfe Steel Kk | High tensile strength product excellent in resistance to delayed fracture and process for production of the same |
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| JP2012211360A (en) * | 2011-03-31 | 2012-11-01 | Jfe Steel Corp | High-strength steel having excellent toughness of weld heat-affected zone and uniform elongation, and method of manufacturing the same |
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2015
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Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1218559B1 (en) * | 1999-08-30 | 2003-05-21 | V & M Deutschland GmbH | Use of a steel alloy for producing high-tensile seamless steel tubes |
| JP2008013808A (en) * | 2006-07-05 | 2008-01-24 | Jfe Steel Kk | High-tensile-strength welded steel pipe for automotive structural member, and manufacturing method therefor |
| JP2008266780A (en) * | 2007-03-29 | 2008-11-06 | Jfe Steel Kk | High tensile strength product excellent in resistance to delayed fracture and process for production of the same |
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| JP2012211360A (en) * | 2011-03-31 | 2012-11-01 | Jfe Steel Corp | High-strength steel having excellent toughness of weld heat-affected zone and uniform elongation, and method of manufacturing the same |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106566986A (en) * | 2016-11-10 | 2017-04-19 | 武汉钢铁股份有限公司 | High surface quality hot rolled steel plate used for manufacturing swing arm of excavator, and manufacturing method thereof |
| CN106702270A (en) * | 2016-11-10 | 2017-05-24 | 武汉钢铁股份有限公司 | Thick-specification high-surface-quality hot-rolling and straightening steel sheet and manufacturing method thereof |
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| CN110157985A (en) * | 2019-05-31 | 2019-08-23 | 张家港华程机车精密制管有限公司 | Steel plate for crawler crane string abdomen arm and hot hardening and tempering process that it is carried out |
| CN113151635A (en) * | 2021-03-30 | 2021-07-23 | 江苏永钢集团有限公司 | Production process of steel pipe for crane boom |
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