CN102002632B - Controlled rolling type super-thick high-strength ship plate steel and preparation method thereof - Google Patents
Controlled rolling type super-thick high-strength ship plate steel and preparation method thereof Download PDFInfo
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Abstract
The invention relates to controlled rolling type super-thick high-strength ship plate steel and a preparation method thereof. The controlled rolling type super-thick high-strength ship plate steel is made by smelting, refining, continuous casting and hot rolling, and the controlled rolling steel comprises the following components in percentage by mass: 0.11 to 0.16 percent of C, 0.30 to 0.50 percent of Si, 1.40 to 1.60 percent of Mn, 0.025 to 0.55 percent of Als, 0.030 to 0.050 percent of Nb, 0.030 to 0.05 percent of V, 0.010 to 0.020 percent of Ti, less than 0.020 percent of P, less than 0.012 percent of S and the balance of Fe. The invention has the advantages that: the chemical components and process are simple; the thickness specification is as large as 60 millimeters; the performance of the product is stable; and the like.
Description
Technical field
The present invention relates to special thick high-strength ship plates of a kind of controlled rolling type and preparation method thereof, belong to the low alloy steel field.
Background technology
Shipbuilding industry is one of Chinese national economy mainstay industry, and development in recent years is rapid, for the application of hull structural steel provides wide application prospect; Shipbuilding is the main raw material of shipbuilding with steel plate; In hull weight, steel account for 90%, and wherein sheet material accounts for 70%～80% of steel.Ship steel is mainly used in deck, outside plate, base plate, section structure of hull etc.High speed development along with world economy; Develop the striving direction that is still shipping industry to maximization, new and high technology direction; But shipbuilding feels that regular tenacity hull steel undercapacity is to satisfy the demand of its development; So hull is proposed more kinds and higher-quality requirement with the particularly special thick high-strength marine steel of steel, hope to increase considerably the ratio of HSLA, the application percentage of special thick high-strength ship plates in shipbuilding constantly strengthens.
At present; Many to the high-strength ship plates mode of production; But mostly most of iron and steel enterprises are to adopt microalloying to be aided with the production that TMCP technology approaches intensity deck of boat steel with a high standard, thereby satisfy each surveying society's standard and user's requirement, and special thick specification is 60mm controlled rolling rolling technology less especially.Because the strict especially special thick high-strength ship plates of various performance index of deck of boat steel; This has just brought sizable difficulty to the formulation of design of chemical composition and production technique; Need just can determine rational production decision through repeatedly manufacturing experimently, this has just brought great difficulty to iron and steel enterprise's product restructuring and product line upgrading.The production of special thick high-strength ship plates is big because of its gauge; Width is bigger, is easy to produce some defectives in the production, such as component segregation of continuous casting slab; Rolling deformation is inhomogeneous; Tissue odds is even, and especially homogeneity of structure control difficulty is bigger on thickness direction, and this just causes surface of steel plate and heart portion performance is inconsistent, intensity and toughness are undesirable.Special medium-thickness ship plate steel is in process of production because the continuously cast bloom specification is big, and the defective that in the operation of rolling, produces just has a strong impact on the intensity and the toughness of steel, and the target level of product quality fluctuation is big, lumber recovery is low thereby cause, and the business economic benefit is formed detrimentally affect.So for the special thick high-strength ship plates rational chemical design of controlled rolling type, technology simple to operate, reasonably controlled rolling is to solve one of method of a special thick high-strength ship plates production difficult problem.
Summary of the invention
To the deficiency of prior art, the present invention provides special thick high-strength ship plates of a kind of controlled rolling type and preparation method thereof.Product Chemical Composition of the present invention is reasonable in design, and controlling of production process is simple, and production efficiency is high, quality product, stable performance.
Technical scheme of the present invention is following:
The special thick high-strength ship plates of a kind of controlled rolling type, wherein the chemical ingredients mass percentage content of steel is: C 0.11%-0.16%, Si 0.30%-0.50%; Mn 1.40%-1.60%, Als 0.025%-0.055%, Nb 0.030%-0.050%; V 0.030%-0.05%, Ti 0.010%-0.020%, P＜0.020%; S＜0.012%, surplus are Fe.
Confirming of steel grades: the at first requirement of proof strength is the requirement of welding property once more, and promptly carbon equivalent can not be high, is the requirement to low-temperature impact toughness then.Based on the requirement of intensity and welding property, control C 0.11%-0.16%, Mn1.40%-1.60%; The loss of intensity is through adding Nb, V, Ti microalloying and C, and Nb [C, N], V [C are separated out in the reasonable control of N content; N], Ti [C, N] remedies, and helps to improve austenite recrystallization temperature and crystal grain thinning simultaneously; Control Nb0.030-0.050%, V 0.030%-0.05%, Ti 0.010%-0.020%; For guaranteeing the cleanliness factor of molten steel, the present invention has still proposed control to elements such as S, P and has required: S≤0.012%, P≤0.020% in addition.
Preferably, the special thick high-strength ship plates of a kind of controlled rolling type, wherein the chemical ingredients mass percentage content of steel is: C0.13%-0.15%; Si 0.35%-0.36%, Mn 1.45%-1.51%, Als 0.031%-0.038%; Nb 0.038%-0.047%, V 0.033%-0.045%, Ti 0.017%; P 0.009%-0.010%, S 0.003%-0.004%, surplus is Fe.
One of preferred technical scheme of the present invention is, the chemical ingredients mass percentage content of steel is: C 0.13%, and Si 0.36%, and Mn 1.45%; P 0.009%, and S 0.004%, and Nb 0.038%, and V 0.033%; Ti 0.017%, and Als 0.038%, and surplus is Fe.
Two of the preferred technical scheme of the present invention is, the chemical ingredients mass percentage content of steel is: C 0.15%, and Si 0.35%, and Mn 1.51%; P 0.010%, and S 0.003%, and Nb 0.047%, and V 0.045%; Ti 0.017%, and Als 0.031%, and surplus is Fe.
The preparation method of the special thick high-strength ship plates of a kind of controlled rolling type comprises smelting, heating, roughing, finish rolling operation, it is characterized in that the chemical ingredients mass percentage content of controlling steel is: C 0.11%-0.16%, Si 0.30%-0.50%; Mn 1.40%-1.60%, Als 0.025%-0.055%, Nb 0.030%-0.050%, V 0.030%-0.05%; Ti 0.010%-0.020%, P＜0.020%, S＜0.012%; Surplus is Fe, wherein
In the smelting procedure, refinery scum basicity R is controlled between the 2.5-3.0, and the Ar envelope adds the full guard cast, 20 ± 5 ℃ of tundish superheating temperature controls;
In the heating process, process furnace internal heating temperature is 1160 ℃-1220 ℃, and be 3.5-5 hour heat-up time;
In the roughing operation, start rolling temperature 1000-1180 ℃, it is rolling to carry out the 5-7 passage, accumulative total draft >=50%, and intermediate blank thickness >=2H treats temperature after rolling, described H is a finished product thickness;
In the finish rolling operation, start rolling temperature is 830-870 ℃, and it is rolling to carry out the 5-9 passage, and exit thickness 60mm, rolls the back air cooling by finishing temperature 810-850 ℃.
It is technical barriers such as mechanical property instability and the thickness direction tissue odds of special thick high-strength ship plates of 60mm be even that innovative point of the present invention has been to capture thickness.
Special thick high-strength ship plates steel plate to the present invention's preparation is got horizontal sample along head 1/2 thickness place; The rolling direction face pre-grinding of microscopic test machine upper edge, polishing in the laboratory; Corrode with nitric acid and to process metallographic specimen, under opticmicroscope, observe and measure grain fineness number, the steel matrix homogeneous microstructure is tiny; Grain fineness number is about 9 grades, and it is desirable that the V that disperse distributes, Nb, Ti [C, N] change thing control; Get horizontal sample along steel plate head 1/2 thickness place and be processed into the bar-shaped sample of surveying society's requirement standard, on 100 tons of tensile testing machines, carry out tension test, steel plate tensile property (seeing table 1) is stable; On the 450J trier, to requiring the impact specimen of processing to make an experiment according to surveying society, impelling strength value stabilization and surplus capacity be big (seeing table 1), satisfies each surveying society's standard-required fully.And product Chemical Composition of the present invention is reasonable in design, and controlling of production process is simple, and production efficiency is high, quality product, stable performance.
Description of drawings
Fig. 1 is the surperficial metallographic structure figure of the special thick high-strength ship plates of embodiment 1
Fig. 2 is the metallographic structure figure of heart portion of the special thick high-strength ship plates of embodiment 1
Embodiment
Below in conjunction with embodiment the present invention is further specified, but be not limited thereto.
Steel plate to the special thick high-strength ship plates of following examples preparations is got horizontal sample along head 1/2 thickness place; The rolling direction face pre-grinding of microscopic test machine upper edge, polishing in the laboratory; Corrode with nitric acid and to process metallographic specimen, under opticmicroscope, observe and measure grain fineness number, the steel matrix homogeneous microstructure is tiny; Grain fineness number is about 9 grades, and it is desirable that the V that disperse distributes, Nb, Ti [C, N] change thing control; Get horizontal sample along steel plate head 1/2 thickness place and be processed into the bar-shaped sample of surveying society's requirement standard, on 100 tons of tensile testing machines, carry out tension test, steel plate tensile property (seeing table 1) is stable; On the 450J trier, to requiring the impact specimen of processing to make an experiment according to surveying society, impelling strength value stabilization and surplus capacity be big (seeing table 1).
Embodiment 1
The special thick high-strength ship plates of a kind of controlled rolling type, wherein the chemical ingredients mass percentage content of steel is: C 0.11%, Si0.34%, Mn 1.43%; P 0.008%, and S 0.005%, and Nb 0.041%, and V 0.035%; Ti 0.018%, and Als 0.037%, and surplus is Fe.
The preparation method of the special thick high-strength ship plates of above-mentioned controlled rolling type is following: comprise smelting, heating, roughing, finish rolling operation; Wherein refinery scum basicity is controlled at 2.5; Steel ladle pouring adds the full guard cast that the Ar envelope is protected, the tundish submerged nozzle adds the Ar envelope with long nozzle, and the tundish superheating temperature is controlled at 20 ± 5 ℃; Steel billet is put into the process furnace heating, and Heating temperature is 1200 ℃, 4.5 hours heat-up times.Steel billet is come out of the stove, and after preparatory scale breaker de-scaling, get into roughing mill and be rolled, 1170 ℃ of start rolling temperatures, it is rolling to have carried out 6 passages; Every time draft is respectively: 7.9%, 7.1%, 9.5%, 8.1%; 16.8%, 16.4%, total draft is 50%, and intermediate blank thickness is 130mm.After roughing finishes, through treating temperature, send into finishing mill, the finish rolling start rolling temperature is 860 ℃, and it is rolling to have carried out 6 passages altogether, and every time draft is respectively: 13.9%, 15.5%, 15.4%, 14.2%, 13.2%, 11.8%, and total draft is 60%.After controlled rolling finished, steel plate carried out air cooling, obtains the thick high strength steel plate for ship building of controlled rolling type 60mm.
Fig. 1 is the surperficial metallographic structure figure of the special thick high-strength ship plates of present embodiment, can see that by figure metallographic structure is ferritic+perlite.
Fig. 2 is the metallographic structure figure of heart portion of the special thick high-strength ship plates of present embodiment, can see that by figure metallographic structure is ferritic+perlite.
Embodiment 2
The special thick high-strength ship plates of a kind of controlled rolling type, wherein the chemical ingredients mass percentage content of steel is:: C 0.13%, Si0.36%, and Mn 1.45%; P 0.009%, and S 0.004%, and Nb 0.038%, and V 0.033%; Ti 0.017%, and Als 0.038%, and surplus is Fe.
The preparation method of the special thick high-strength ship plates of above-mentioned controlled rolling type is following: comprise smelting, heating, roughing, finish rolling operation; Wherein refinery scum basicity is controlled at 2.8, and steel ladle pouring adds the full guard cast that the Ar envelope is protected, the tundish submerged nozzle adds the Ar envelope with long nozzle, and the tundish superheating temperature is controlled at 20 ± 5 ℃; Steel billet is put into the process furnace heating, and Heating temperature is 1180 ℃, 4 hours heat-up times.Steel billet is come out of the stove, and after preparatory scale breaker de-scaling, get into roughing mill and be rolled, 1160 ℃ of start rolling temperatures, it is rolling to have carried out 6 passages; Every time draft is respectively: 14.2%, 11.3%, 10.2%, 10.8%; 9.9%, 9.1%, total draft is 50%, and intermediate blank thickness is 150mm.Treat temperature after roughing finishes, send into finishing mill, the finish rolling start rolling temperature is 870 ℃, and it is rolling to have carried out 6 passages altogether, and every time draft is respectively: 13.1%, 14.6%, 14.5%, 14.3%, 14.4%, 14.1%, and total draft is 60%.After controlled rolling finished, steel plate carried out air cooling, obtains the thick high strength steel plate for ship building of controlled rolling type 60mm.
Embodiment 3
The special thick high-strength ship plates of a kind of controlled rolling type, wherein the chemical ingredients mass percentage content of steel is: C 0.15%, Si0.35%, Mn 1.51%; P 0.010%, and S 0.003%, and Nb 0.047%, and V 0.045%; Ti 0.017%, and Als 0.031%, and surplus is Fe.
The preparation method of the special thick high-strength ship plates of above-mentioned controlled rolling type is following: comprise smelting, heating, roughing, finish rolling operation; Wherein refinery scum basicity is controlled at 3.0, and steel ladle pouring adds the full guard cast that the Ar envelope is protected, the tundish submerged nozzle adds the Ar envelope with long nozzle, and the tundish superheating temperature is controlled at 20 ± 5 ℃; Steel billet is put into the process furnace heating, and Heating temperature is 1220 ℃, 5 hours heat-up times.Steel billet is come out of the stove, and after preparatory scale breaker de-scaling, get into roughing mill and be rolled, 1139 ℃ of start rolling temperatures, it is rolling to have carried out 6 passages, and every time draft is respectively: 14.2%, 10.6%, 9.5%, 11.3%, 10.3%, 9.4%, total draft is 50%.Treat temperature after roughing finishes, send into finishing mill, the finish rolling start rolling temperature is 870 ℃, and it is rolling to have carried out 6 passages altogether; Every time draft is respectively: 14.6%, 16.3%, 15.5%, 14%; 12.8%, 11.6%, total draft is 60%, and intermediate blank thickness is 150mm.After controlled rolling finished, steel plate carried out air cooling, obtains the thick high strength steel plate for ship building of controlled rolling type 60mm.
The present invention can also have other embodiments, and the technical scheme that equal replacement of all employings or equivalent transformation become all drops within the scope of requirement protection of the present invention.
Table 1: the mechanical property of the special thick high-strength ship plates of embodiment of the invention preparation
Can find out that by last table the special thick high-strength ship plates of the present invention's preparation satisfies each surveying society's standard-required fully.
Claims (1)
1. the preparation method of the special thick high-strength ship plates of controlled rolling type comprises smelting, heating, roughing, finish rolling operation, it is characterized in that, the chemical ingredients mass percentage content of control steel is: C 0.11%-0.16%; Si 0.30%-0.50%, Mn1.40%-1.60%, Als 0.025%-0.055%, Nb 0.030%-0.050%; V 0.030%-0.05%, Ti 0.010%-0.020%, P＜0.020%, S＜0.012%; Surplus is Fe, wherein
In the said smelting procedure, refinery scum basicity R is controlled between the 2.5-3.0, and the Ar envelope adds the full guard cast, 20 ± 5 ℃ of tundish superheating temperature controls;
In the said heating process, process furnace internal heating temperature is 1160 ℃-1220 ℃, and be 3.5-5 hour heat-up time;
In the said roughing operation, start rolling temperature 1000-1180 ℃, it is rolling to carry out the 5-7 passage, accumulative total draft >=50%, and intermediate blank thickness >=2H treats temperature after rolling, described H is a finished product thickness;
In the finish rolling operation, start rolling temperature is 830-870 ℃, and it is rolling to carry out the 5-9 passage, and exit thickness 60mm, rolls the back air cooling by finishing temperature 810-850 ℃.
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| CN102212750A (en) * | 2011-05-13 | 2011-10-12 | 莱芜钢铁集团有限公司 | Steel plate for ship structure and manufacture method thereof |
| CN102199725B (en) * | 2011-05-13 | 2016-03-16 | 莱芜钢铁集团有限公司 | Structural steel for bridge and production method thereof |
| CN102277529A (en) * | 2011-07-28 | 2011-12-14 | 莱芜钢铁集团有限公司 | High-strength high-tenacity ship plate steel and TMCP (Thermal Mechanical Control Process) production technology method thereof |
| CN103014530B (en) * | 2012-12-21 | 2014-07-09 | 鞍钢股份有限公司 | Method for improving impact performance of D-level ship plate |
| CN105220068A (en) * | 2015-10-20 | 2016-01-06 | 南京钢铁股份有限公司 | A kind of special thick Marine Engineering Steel and preparation method thereof |
| CN105755375B (en) * | 2016-04-19 | 2017-10-24 | 江阴兴澄特种钢铁有限公司 | A kind of continuous casting billet production low compression ratio high performance ultra-thick steel plate and its manufacture method |
| CN106222558A (en) * | 2016-08-25 | 2016-12-14 | 山东钢铁股份有限公司 | A kind of low alloy steel plate and the preparation method of low alloy steel plate |
| CN107755440A (en) * | 2017-09-12 | 2018-03-06 | 舞阳钢铁有限责任公司 | A kind of steel ingot that reduces is become a useful person the method for super-thick steel plate operation of rolling iron scale |
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