CN103993146A - Process for manufacturing marine carbon-steel shaft forgings - Google Patents
Process for manufacturing marine carbon-steel shaft forgings Download PDFInfo
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- CN103993146A CN103993146A CN201410222625.2A CN201410222625A CN103993146A CN 103993146 A CN103993146 A CN 103993146A CN 201410222625 A CN201410222625 A CN 201410222625A CN 103993146 A CN103993146 A CN 103993146A
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Abstract
The invention provides a process for manufacturing marine carbon-steel shaft forgings. According to the invention, the machining process is simplified, the production efficiency is increased greatly, the machining allowance of the forgings is reduced, the utilization ratio of materials is increased, the production cost is reduced, and the market competitiveness is improved. The process is characterized by comprising the following steps: (1) producing a marine carbon-steel shaft forging material, and adding Ni or/and Al alloying elements during the production of carbon steel; (2) heating the marine carbon-steel shaft forging material produced in the step (1), so as to forge the marine carbon-steel shaft forgings; (3) carrying out heat treatment on the forged marine carbon-steel shaft forgings.
Description
Technical field
The present invention relates to the technical field of mechanical component forging process, be specially a kind of manufacturing process of carbon steel forged shaft peculiar to vessel.
Background technology
Along with developing rapidly of oceangoing ship industry as the world, since the seventies, forgings for ship specification is increasing, and technical requirements is more and more higher, and production difficulty is also increasing.Particularly China's shipbuilding has obtained fast development in recent years, and China's shipbuilding sharply rises to the demand of forgings for ship at present.This just requires the forging manufacturing firm of China to change idea, constantly brings forth new ideas, and develops as early as possible make new advances forging and novel process, meets the needs of shipbuilding.
Carbon steel carbon content is low, and carbon content is less than 0.5%.Compare with other steel classes, good plasticity is the basic material that in the modern industry, use the earliest, cost is minimum, performance range is the widest, usage quantity is maximum.Each industrial country of the world, when making great efforts to increase Hi-Stren steel and steel alloy output, also exactissima diligentia improves carbon steel quality, expands kind and use range.The proportion of the output of current carbon steel product in various countries' steel ultimate production, approximately remain on 80% left and right, it is not only widely used in building, bridge, railway, vehicle, boats and ships and various machine building industry, and is also used in a large number at aspects such as the petrochemical industry in modern age, ocean exploitation.Being applicable to nominal pressure PN≤32.0MPa, temperature is-media such as water, steam, air, hydrogen, ammonia, nitrogen and petroleum product of 30-425 ℃.Carbon steel deironing, carbon and limit the quantity of with outside the impurity such as interior silicon, manganese, phosphorus, sulphur, containing the steel of other alloying elements.Its performance depends primarily on carbon content.The carbon content of carbon steel increases, and the intensity of steel, hardness raise, and plasticity, toughness and weldability reduce.Therefore, it is on product that carbon steel forged shaft peculiar to vessel is used the rudder at boats and ships, requires to have good mechanical integrated performance, sometimes also requires to have higher shock resistance, higher low-temperature flexibility.
Carbon steel forged shaft peculiar to vessel is one of key components and parts of marine rudder system, in work, bear periodically variable bending and torsion moment, bear mass force, vibration additional stress simultaneously, and the effect of repeated load, stressing conditions is complicated, and load is large, easily produce fatigure failure, cause rudderpost fracture, will cause the damage of other parts of marine rudder system, directly affect the safety of ship's fitting.Therefore, the intensity of carbon steel forged shaft peculiar to vessel, rigidity, wear resistance etc. have been proposed to higher requirement.In order to meet the requirement of various mechanical properties, the inside of carbon steel forged shaft peculiar to vessel and surface imperfection should be lacked, weave construction, Fiber Distribution is wanted rationally, geomery is wanted accurately, especially large-scale rudderpost peculiar to vessel, the requirement of ensuring the quality of products, reduce machining allowance, it is very important problem in rudderpost forging for argosy, because use common carbon steel material, adopt conventional normalizing or normalizing+tempering to carry out property heat treatment, be difficult to reach design requirements, carbon steel forged shaft conventional fabrication processes flow process peculiar to vessel is: heating → forge → forge postheat treatment → roughing → modified (the second thermal treatment) → service check → alignment → semi-finishing → deliver for a check warehouse-in, carbon steel forged shaft peculiar to vessel is organized crystal grain preferably in order to obtain, need to carry out repeatedly thermal treatment to forging, increase due to processing treatment operation, make process period longer, working (machining) efficiency is low, owing to need to repeatedly processing the process redundancy that must increase forging, caused the waste of material, increased production cost, reduced the market competitiveness.
Summary of the invention
For the problems referred to above, the invention provides a kind of manufacturing process of carbon steel forged shaft peculiar to vessel, simplified complete processing, greatly improve production efficiency, and reduced forging process surplus, improved material use efficiency, reduce production cost, improved the market competitiveness.
Its technical scheme is such: a kind of manufacturing process of carbon steel forged shaft peculiar to vessel, is characterized in that: it comprises the following steps:
(1), carbon steel forged shaft material produce peculiar to vessel, in carbon steel production process, add Ni or/and Al alloying element;
(2), to the carbon steel forged shaft material peculiar to vessel of producing in step (1) heat, forging molding carbon steel forged shaft peculiar to vessel;
(3), the carbon steel forged shaft peculiar to vessel after forging is heat-treated.
It is further characterized in that: described technique also comprises the steps: the carbon steel forged shaft peculiar to vessel after thermal treatment to process and property heat treatment; Described thermal treatment comprises that normalizing adds tempering; The described normalizing type of cooling is air-cooled or mist is cold;
In carbon steel production process, add Ni:0.08%-0.12%(weight percent) or/and Al:0.015%-0.035%(weight percent) alloying element; In carbon steel: C≤0.65%(weight percent), Si:0.25-0.35%(weight percent), Mn:0.55-0.75%(weight percent), Cr :≤0.4%(weight percent), P :≤0.035%(weight percent), S :≤0.035%(weight percent), Mo :≤0.1%(weight percent), Ni:0.08-0.012%(weight percent), Al:0.015-0.035%(weight percent), all the other are Fe.
In said structure of the present invention, owing to adding Ni or/and Al alloying element in the production process at carbon steel forged shaft material peculiar to vessel, when guaranteeing carbon steel forged shaft mechanical property peculiar to vessel, improved the toughness of carbon steel forged shaft material peculiar to vessel, reduced processing number of times, simplified complete processing, greatly improve production efficiency, and reduced forging process surplus, improved material use efficiency, reduce production cost, improved the market competitiveness.
Embodiment
A manufacturing process for carbon steel forged shaft peculiar to vessel, it comprises the following steps:
(1), carbon steel forged shaft material produce peculiar to vessel, in carbon steel production process, add Ni or/and Al alloying element;
(2), to the carbon steel forged shaft material peculiar to vessel of producing in step (1) heat, forging molding carbon steel forged shaft peculiar to vessel;
(3), the carbon steel forged shaft peculiar to vessel after forging is heat-treated;
(4), the carbon steel forged shaft peculiar to vessel after thermal treatment is processed and property heat treatment.
In carbon steel production process, add Ni:0.08%-0.12%(weight percent), Al:0.015%-0.035%(weight percent) alloying element, by the optimization of technical process, modified (the second thermal treatment), alignment, three operations of semi-finishing in conventional fabrication processes flow process have been cancelled, can greatly improve manufacture efficiency, reduce machining allowance simultaneously, improve material use efficiency, and then reach and reduce costs, improve the object of the market competitiveness.
To the carbon steel forged shaft peculiar to vessel after thermal treatment, processing with property heat treatment is the common subsequent treatment process of carbon steel forged shaft peculiar to vessel.
By adjusting the internal control scope of chemical composition, such as adding the alloying elements such as some Ni, Al on the basis at common carbon steel, can greatly improve ferritic intensity, improve obdurability, can increase the occupancy volume of carbide, thereby improve the mechanical property of (normalizing+tempering) material under as-normalized condition simultaneously.
By " normalizing+tempering " technique of forging postheat treatment, substitute second heat treated " quenching+tempering " technique, common normalizing type of cooling air cooling is adjusted into fast cooling air-cooled, the carbon steel forged shaft cool to room temperature peculiar to vessel after forging, also need if desired to adopt mist cold, thereby obtain the good crystal grain of organizing, make the mechanical property of stern tube shaft forging reach the requirement of ship rule.
When guaranteeing carbon steel forged shaft mechanical property peculiar to vessel, improved the toughness of carbon steel forged shaft material peculiar to vessel, reduced processing number of times, simplified complete processing, greatly improve production efficiency, and reduced forging process surplus, improved material use efficiency, reduce production cost, improved the market competitiveness.
Rectify and improve on the one hand forging process, on the basis of common carbon steel, add on the one hand the alloying elements such as Ni, Al that some improve obdurabilities; On the other hand common normalizing type of cooling air cooling is adjusted into air-cooledly, also needs if desired to adopt mist cold.Such one is to improve material rate, makes it to have the potential that meets preferably service requirements, the 2nd, and by accelerating the mode of cooling rate, obtain good tissue, thereby finally reach the performance index that meet the demands.
Embodiment mono-:
(1) take the chemical composition that C45 steel is example:
All the other are Fe;
(2) take the mechanical property that C45 steel forgings is example:
(1) tensile strength Rm (MPa): >=600;
(2) upper yield strength ReH (MPa): >=300;
(3) elongation after fracture A (%): >=18.
(3) take the overall quality that C45 steel forgings is example requires:
(1) forging is through visual inspection, should be without injurous defects such as macroscopic crackle, interlayer, folding, slag inclusions;
(2) forging shape, size and surface quality should meet the requirement of order pattern;
(3) forging guarantees that interior tissue does not exist white point;
(4) standard that the ultrasonic test quality grade of forging is pressed NB/T47008-2010.Non-destructive testing standard is pressed CB/T1159-1998 and JB/T5000.15-2006 standard.
Embodiment bis-:
(1) take the chemical composition that C35 steel is example:
All the other are Fe;
(2) take the mechanical property that C35 steel forgings is example:
(1) tensile strength Rm (MPa): >=520;
(2) upper yield strength ReH (MPa): >=260;
(3) elongation after fracture A (%): >=21.
(3) take the overall quality that C35 steel forgings is example requires:
(1) forging is through visual inspection, should be without injurous defects such as macroscopic crackle, interlayer, folding, slag inclusions;
(2) forging shape, size and surface quality should meet the requirement of order pattern;
(3) forging guarantees that interior tissue does not exist white point;
(4) standard that the ultrasonic test quality grade of forging is pressed NB/T47008-2010.Non-destructive testing standard is pressed CB/T1159-1998 and JB/T5000.15-2006 standard.
Claims (5)
1. a manufacturing process for carbon steel forged shaft peculiar to vessel, is characterized in that: it comprises the following steps:
(1), carbon steel forged shaft material produce peculiar to vessel, in carbon steel production process, add Ni or/and Al alloying element;
(2), to the carbon steel forged shaft material peculiar to vessel of producing in step (1) heat, forging molding carbon steel forged shaft peculiar to vessel;
(3), the carbon steel forged shaft peculiar to vessel after forging is heat-treated.
2. the manufacturing process of a kind of carbon steel forged shaft peculiar to vessel according to claim 1, is characterized in that: described technique also comprises the steps: the carbon steel forged shaft peculiar to vessel after thermal treatment to process and property heat treatment.
3. the manufacturing process of a kind of carbon steel forged shaft peculiar to vessel according to claim 1, is characterized in that: described thermal treatment comprises that normalizing adds tempering.
4. the manufacturing process of a kind of carbon steel forged shaft peculiar to vessel according to claim 3, is characterized in that: the described normalizing type of cooling is air-cooled or mist is cold.
5. according to the manufacturing process of the arbitrary described carbon steel forged shaft a kind of peculiar to vessel of claim 1-4, it is characterized in that: in carbon steel production process, add Ni:0.08%-0.12%(weight percent) or/and Al:0.015%-0.035%(weight percent) alloying element; In carbon steel: C≤0.65%(weight percent), Si:0.25-0.35%(weight percent), Mn:0.55-0.75%(weight percent), Cr :≤0.4%(weight percent), P :≤0.035%(weight percent), S :≤0.035%(weight percent), Mo :≤0.1%(weight percent), Ni:0.08-0.012%(weight percent), Al:0.015-0.035%(weight percent), all the other are Fe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410222625.2A CN103993146A (en) | 2014-05-26 | 2014-05-26 | Process for manufacturing marine carbon-steel shaft forgings |
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| CN201410222625.2A CN103993146A (en) | 2014-05-26 | 2014-05-26 | Process for manufacturing marine carbon-steel shaft forgings |
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| CN103993146A true CN103993146A (en) | 2014-08-20 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105331900A (en) * | 2015-11-19 | 2016-02-17 | 张家港市广大机械锻造有限公司 | Manufacturing process of C45 steel marine shaft forging |
| CN105568162A (en) * | 2015-12-23 | 2016-05-11 | 宝鼎科技股份有限公司 | Marine low-speed and high-power diesel engine connecting rod forge piece and manufacturing technology |
| CN105755365A (en) * | 2015-12-30 | 2016-07-13 | 宝鼎科技股份有限公司 | Low-temperature-resistant large propeller shaft and manufacturing process thereof |
| CN106191679A (en) * | 2016-08-27 | 2016-12-07 | 宝鼎科技股份有限公司 | Argosy high strength carbon manganese steel jackshaft forging and Technology for Heating Processing |
| CN107557540A (en) * | 2017-10-30 | 2018-01-09 | 山东伊莱特重工股份有限公司 | A kind of control cold normalizing method of A105 forging |
| CN111500926A (en) * | 2020-04-24 | 2020-08-07 | 建龙北满特殊钢有限责任公司 | Steel material for ships and manufacturing method thereof |
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| CN1873042A (en) * | 2005-06-03 | 2006-12-06 | 株式会社神户制钢所 | Steel for forging having excellent hydrogen embrittlement resistance and crankshaft |
| CN1986839A (en) * | 2005-12-22 | 2007-06-27 | 攀枝花钢企工贸有限责任公司 | Process of producing high quality carbon steel ingot with aluminium and RE added for high grade forging |
| EP1978124A1 (en) * | 2007-04-05 | 2008-10-08 | Kabushiki Kaisha Kobe Seiko Sho | Forging steel, forging and crankshaft |
| CN101492788A (en) * | 2009-03-05 | 2009-07-29 | 芜湖三联锻造有限公司 | Microalloy non-hardened and tempered steel and controlled forging and cooling process |
-
2014
- 2014-05-26 CN CN201410222625.2A patent/CN103993146A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1873042A (en) * | 2005-06-03 | 2006-12-06 | 株式会社神户制钢所 | Steel for forging having excellent hydrogen embrittlement resistance and crankshaft |
| CN1986839A (en) * | 2005-12-22 | 2007-06-27 | 攀枝花钢企工贸有限责任公司 | Process of producing high quality carbon steel ingot with aluminium and RE added for high grade forging |
| EP1978124A1 (en) * | 2007-04-05 | 2008-10-08 | Kabushiki Kaisha Kobe Seiko Sho | Forging steel, forging and crankshaft |
| CN101492788A (en) * | 2009-03-05 | 2009-07-29 | 芜湖三联锻造有限公司 | Microalloy non-hardened and tempered steel and controlled forging and cooling process |
Non-Patent Citations (1)
| Title |
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| 韩小勇: "船用轴系碳锰钢的成分优化及热处理工艺改进", 《金属热处理》, vol. 35, no. 8, 31 August 2010 (2010-08-31) * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105331900A (en) * | 2015-11-19 | 2016-02-17 | 张家港市广大机械锻造有限公司 | Manufacturing process of C45 steel marine shaft forging |
| CN105568162A (en) * | 2015-12-23 | 2016-05-11 | 宝鼎科技股份有限公司 | Marine low-speed and high-power diesel engine connecting rod forge piece and manufacturing technology |
| CN105755365A (en) * | 2015-12-30 | 2016-07-13 | 宝鼎科技股份有限公司 | Low-temperature-resistant large propeller shaft and manufacturing process thereof |
| CN106191679A (en) * | 2016-08-27 | 2016-12-07 | 宝鼎科技股份有限公司 | Argosy high strength carbon manganese steel jackshaft forging and Technology for Heating Processing |
| CN107557540A (en) * | 2017-10-30 | 2018-01-09 | 山东伊莱特重工股份有限公司 | A kind of control cold normalizing method of A105 forging |
| CN111500926A (en) * | 2020-04-24 | 2020-08-07 | 建龙北满特殊钢有限责任公司 | Steel material for ships and manufacturing method thereof |
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Application publication date: 20140820 |