CN102728755A - Method for manufacturing rack steel - Google Patents
Method for manufacturing rack steel Download PDFInfo
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- CN102728755A CN102728755A CN2012102026967A CN201210202696A CN102728755A CN 102728755 A CN102728755 A CN 102728755A CN 2012102026967 A CN2012102026967 A CN 2012102026967A CN 201210202696 A CN201210202696 A CN 201210202696A CN 102728755 A CN102728755 A CN 102728755A
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Abstract
The invention discloses a method for manufacturing rack steel, and belongs to the technical field of mechanical manufacturing. Rolling is substituted by forging in the method, and the high-strength thick plate rack steel is manufactured by using a forging method. The manufacturing method comprises the following steps of: 1, smelting: smelting a steel plate by adopting a vacuum degassing refining method, strictly controlling chemical component of materials and pouring with a water-cooled die; 2, forging: forging a wide and thick plate blank by using a forging press of more than 3,150 tons, wherein the forging process comprises the following steps of: (1) heating a steel blank or a steel ingot, (2) forging a plate blank, (3) annealing the blank and (4) roughly machining the blank and removing surface black skin and defects; and 3, hardening and tempering: hardening and tempering the roughly machined rack steel plate, controlling deformation of the steel plate, and thus obtaining the required rack steel. The method has the advantages that rolling is substituted by forging in the method, and the high-strength thick plate rack steel is manufactured by using the forging method, so that the rack steel manufacturing space is expanded, and domestication of the rack steel is realized; and the rack steel has remarkable economic and social benefits.
Description
Technical field
The invention belongs to machinery manufacturing technology field.
Background technology
Offshore oil drilling platform is an operational base of implementing sea-bottom oil-gas exploration and exploitation; And the operation principle of offshore oil drilling platform ascending, descending system is gear-rack gear; In the offshore oil drilling platform course of work, gear-rackwork is undertaken the up-down work of whole flat.Therefore, when building marine drilling platform, the quality of materials of tooth bar, machining accuracy and welding occupy crucial status always.At present, the tooth bar steel plate of domestic use all is the rolled plate of import, and at present, domestic rolling steel plate technical difficulty is big, adopts the imported product production cost high.
Summary of the invention
The purpose of this invention is to provide a kind of tooth bar steel machining manufacture, domestic rolling steel plate technical difficulty is big at present to solve, and the tooth bar steel plate of use all is the rolled plate of import, adopts problems such as imported product production cost height.
The technical solution adopted for the present invention to solve the technical problems is to roll to forge generation, makes high-strength plank tooth bar steel with forging method, and its machining manufacture is following:
One, smelt: steel plate should adopt the method production of vacuum deaeration refining in melting, the chemical analysis of strict control of material, and carbon equivalent (check analysis)≤0.70 will adopt the water-cooled die casting.
Two, forge: use the forging press more than 3150 tons, forge generous slab, its Forging Technology step is following:
1, steel billet or steel ingot heating: steel billet that will forge or steel ingot place heating furnace to be heated to initial forging temperature, and initial forging temperature is between 1180-1270 ℃;
2, slab forges: steel billet after will heating or steel ingot place on the press through three fire slab through flat-die forging to requiring size, and final forging temperature is controlled between 850-950 ℃;
3, rough annealing is handled: the generous slab that will forge carries out annealing in process, improves cutting ability;
4, blank roughing: the blank after the annealing in process is carried out roughing, remove surperficial casting skin and defective.
Three, modulation treatment:, control steel plate deformed and hardness with rough machined tooth bar steel plate modulation treatment.
Adopting good effect of the present invention is to roll to forge generation, makes high-strength plank tooth bar steel with forging method, has expanded tooth bar steel processing and manufacturing space, accomplishes the production domesticization of tooth bar steel, and its economic and social benefit is remarkable.
The specific embodiment
Below in conjunction with specific embodiment the present invention is further specified:
Tooth bar steel machining manufacture, this method are to roll to forge generation, make high-strength plank tooth bar steel with forging method, and its concrete production technology is following:
One, smelts: utilize the arc melting molten steel; Through refining, vacuum outgas supervisor control final steel water constituent, adopt the method for water-cooled die casting to pour into a mould, control rational steel ingot composition; Carbon equivalent (check analysis)≤0.70 guarantees the not segregation of steel ingot composition.
Two, three fiery forging moldings:
1, forge for the first time: 1250 ℃ of initial forging temperatures, 800 ℃ of final forging temperatures, steel ingot pressing tongs handle, chamfered edge is frustrated mouth of a river burr;
2, forge for the second time: jumping-up, the pulling of wide anvil, planar end surface;
3, for the third time to the 4th forging: 1250 ℃ of initial forging temperatures, 800 ℃ of final forging temperatures pull out to size, finishing, alignment goes out finished product then.
Three, modifier treatment:
After modified, get the body sample, check mechanical property: yield strength >=690MPa, tensile strength 790-930MPa at the steel plate two ends; Summer is than v-notch impact value: the 1/2 minimum average B configuration value 69J of degree of depth place (vertically) the 1/4 minimum average B configuration value 69J of degree of depth place (vertically)-30 ℃ time the in the time of-40 ℃, hardness: >=260HBS.
Claims (1)
1. a tooth bar steel machining manufacture is characterized in that it being to roll to forge generation, makes high-strength plank tooth bar steel with forging method, and its machining manufacture is following:
1), smelt: steel plate should adopt the method production of vacuum deaeration refining in melting, the chemical analysis of strict control of material, carbon equivalent (check analysis)≤0.70 will adopt the water-cooled die casting;
2), forge: use the forging press more than 3150 tons, forge generous slab, its Forging Technology step:
A: steel billet or steel ingot heating: steel billet that will forge or steel ingot place heating furnace to be heated to initial forging temperature, and initial forging temperature is between 1180-1270 ℃;
B: slab forges: steel billet after will heating or steel ingot place on the press through three fire slab through flat-die forging to requiring size, and final forging temperature is controlled between 850-950 ℃;
C: rough annealing is handled: the generous slab that will forge carries out annealing in process, improves cutting ability;
D: blank roughing: the blank after the annealing in process is carried out roughing, remove surperficial casting skin and defective;
3), modifier treatment: with the modifier treatment of rough machined tooth bar steel plate, control steel plate deformed, obtain strong mechanical performance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102026967A CN102728755A (en) | 2012-06-19 | 2012-06-19 | Method for manufacturing rack steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102026967A CN102728755A (en) | 2012-06-19 | 2012-06-19 | Method for manufacturing rack steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102728755A true CN102728755A (en) | 2012-10-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012102026967A Pending CN102728755A (en) | 2012-06-19 | 2012-06-19 | Method for manufacturing rack steel |
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| CN (1) | CN102728755A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104959498A (en) * | 2015-04-30 | 2015-10-07 | 南京迪威尔高端制造股份有限公司 | Forging raw material production mode selection method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55152127A (en) * | 1979-05-14 | 1980-11-27 | Kawasaki Steel Corp | Preparation of hot rolled steel plate with excellent enamelling property and moldability |
| CN1388331A (en) * | 2001-05-28 | 2003-01-01 | 株式会社昭和 | Method for forming pipe rack and its apparatus |
| CN1405353A (en) * | 2002-10-20 | 2003-03-26 | 吉林大学 | Novel casting and hot work tool steel |
| CN101638716B (en) * | 2009-08-18 | 2011-03-23 | 宝鼎重工股份有限公司 | Special process for freely forging ASTMA514 (GradeQ) steel ingot into platy forged piece |
| CN102345045A (en) * | 2011-06-28 | 2012-02-08 | 南阳汉冶特钢有限公司 | A514GrQ steel plate for offshore platform rack, and production method thereof |
-
2012
- 2012-06-19 CN CN2012102026967A patent/CN102728755A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55152127A (en) * | 1979-05-14 | 1980-11-27 | Kawasaki Steel Corp | Preparation of hot rolled steel plate with excellent enamelling property and moldability |
| CN1388331A (en) * | 2001-05-28 | 2003-01-01 | 株式会社昭和 | Method for forming pipe rack and its apparatus |
| CN1405353A (en) * | 2002-10-20 | 2003-03-26 | 吉林大学 | Novel casting and hot work tool steel |
| CN101638716B (en) * | 2009-08-18 | 2011-03-23 | 宝鼎重工股份有限公司 | Special process for freely forging ASTMA514 (GradeQ) steel ingot into platy forged piece |
| CN102345045A (en) * | 2011-06-28 | 2012-02-08 | 南阳汉冶特钢有限公司 | A514GrQ steel plate for offshore platform rack, and production method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104959498A (en) * | 2015-04-30 | 2015-10-07 | 南京迪威尔高端制造股份有限公司 | Forging raw material production mode selection method |
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Application publication date: 20121017 |