CN100516269C - Manufacturing process of fine crystal strengthened carbon constructional steel hot-rolling thin slab - Google Patents

Manufacturing process of fine crystal strengthened carbon constructional steel hot-rolling thin slab Download PDF

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CN100516269C
CN100516269C CNB2006101166739A CN200610116673A CN100516269C CN 100516269 C CN100516269 C CN 100516269C CN B2006101166739 A CNB2006101166739 A CN B2006101166739A CN 200610116673 A CN200610116673 A CN 200610116673A CN 100516269 C CN100516269 C CN 100516269C
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rolling
percent
steel
hot
finish rolling
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CN101153367A (en
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裴新华
胡恒法
穆海玲
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Shanghai Meishan Iron and Steel Co Ltd
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Shanghai Meishan Iron and Steel Co Ltd
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Abstract

The invention relates to a manufacture process of carbon steel and carbon steel hot rolling plate, in particular to a manufacture process of fine grain reinforcement carbon structural steel and hot rolling sheet plate of the steel. The invention mainly solves the technical problem that hot rolling plate of higher strength can not be produced on common completely continuous hot continuous rolling mill by use of common carbon structural steel at present. The fine grain reinforcement carbon structural steel adopts the following chemical composition (weight percent): 0.14 percent to 0.20 percent of C, 0.10 percent to 0.40 percent of Si, 0.65 percent to 0.90 percent of Mn, less than or equal to 0.025 percent of P, less than or equal to 0.015 percent of S and the rest, Fe. The manufacture process of the hot rolling sheet plate is as follows: a continuous casting slab which meets the requirements of compositions is heated to 1,210 DEG C to 1,250 DEG C; a rough rolling stage comprises five-pass tandem rolling and the end temperature of the rough rolling stage is between 1,050 DEG C and 1,060 DEG C; in addition, the thickness of an intermediate slab ranges from 35 mm to 45 mm. When rough rolling is finished, the intermediate slab is curled through a hot coil box and then is unfolded for finish rolling; a finish rolling stage comprises six-pass tandem rolling with the start rolling temperature ranging between 920 DEG C and 940 DEG C and the end temperature ranging between 820 DEG C and 860 DEG C; after finish rolling, the thickness of a steel plate is between 2 mm to 8 mm; in addition, a laminar flow cooling stage adopts forepart intensive cooling with the coiling temperature ranging from 520 DEG C to 620 DEG C.

Description

A kind of manufacturing process of refined crystalline strengthening structural carbon steel latten
Technical field:
The present invention relates to a kind of carbon steel hot-rolled sheet manufacturing process, particularly a kind of manufacturing process of refined crystalline strengthening structural carbon steel latten.
Background technology:
For realizing the Sustainable development of society, ferrous materials should have the good ratio of performance to price, good combination of strength and toughness and reduce the energy, resource consumption.At present as the yield strength level of the soft steel and the low alloy steel (comprising micro-alloyed steel) of iron structure body of material, using maximum is R E1=200~400MPa.Its schedule of reinforcement comprises solution strengthening, dislocations strengthening, precipitation strength etc., but has only refined crystalline strengthening, when improving intensity, can also improve toughness or keep toughness not descend substantially.Therefore, the refined crystalline strengthening technology is the important channel that research improves the ferrous materials obdurability.At present, the grain fineness number of the carbon structure hot-rolled steel sheet of producing on industrial hot continuous mill reaches 8~9 grades (ASTM standards), and grain-size is equivalent to 14~20 μ m, yield strength R E1=200~350MPa, as will further improving intensity, the method that adopts is exactly the content that increases alloying element at present, relies on solution strengthening and precipitation strength effect, increase the manufacturing cost of steel so on the one hand, unavoidably can cause the decline of toughness of material and the deterioration of welding property simultaneously.
The researchist of states such as China, Korea S, Japan has carried out laboratory study to the theory and the method for refinement ferrous materials, the powerful refrigerative technological line of low temperature gross distortion and distortion back has been proposed, but these technological lines realize having certain difficulty fully on existing industrial production equipment, and owing to excessively pursue grain refining (1 μ m) target, the yield tensile ratio of material increases, and has therefore limited the practical application at these technological lines.
Number of patent application is that CN200310104865.4's " a kind of low-carbon (LC) 420MPa grade composite strengthening ultrafine grain belt steel " close grain band steel that provides has adopted the composition of low-carbon high-manganese, the content of Mn is Mn.0.85~1.10%, therefore the relative carbon structural steel of cost of alloy is still higher, this patent requires to want high than carbon structural steel to the purity of molten steel simultaneously, P<0.01%, S<0.01%, process for making requires high, has increased the cost of steel-making.Only to propose yield strength be 420~450MPa to the mechanical performance index of the steel plate that provides of this patent simultaneously, tensile strength is 530~550MPa, do not guarantee plasticity, toughness indexs such as elongation after fracture and ballistic work, limit the use occasion of steel plate, particularly needed the application under the condition of excellent toughness and low-temperature flexibility.Patent No. application number is CN200310104864.X's " a kind of low-carbon (LC) 420MPa grade composite strengthening ultrafine grain belt steel preparation method " preparation method of providing, and the finish rolling finishing temperature is 770~790 ℃, and rolling the back coiling temperature is 430~470 ℃.Owing to adopt low final rolling temperature and coiling temperature, when improving intensity, cause the toughness of material and plasticity to reduce, limited the application scenario and the scope of material.This has exceeded low final rolling temperature and coiling temperature ability that present industrial strip-mill strip can reach on the other hand, to the requirement harshness of milling train, need carry out special transformation to milling train, is unfavorable for that also tissue is produced in batches.Number of patent application is CN03117280.6's " having the production method of hot-rolled steel sheet of superfine crystal particle and the hot-rolled steel sheet of manufacturing thereof " technology of providing, 1150~1200 ℃ of slab heating temperatures, therefore the Heating temperature that enterprise factory takes for a large amount of steel grades before being lower than is unfavorable for that different trade mark steel grades organize together that industry is big produces.This patent does not propose concrete assurance numerical value to mechanical property, does not particularly guarantee plasticity, toughness indexs such as elongation after fracture and ballistic work yet.Limit the use occasion of steel plate, especially needed the application under the condition of excellent toughness and low-temperature flexibility.Therefore, in order to overcome the deficiency of above-mentioned technology, need a kind of industrial production technology that can on existing common full Continuous Heat tandem rolling mill, utilize the carbon structural steel composition to produce the latten of higher-strength of research and development, the steel plate of making is when intensity improves, have high plasticity, low-temperature flexibility and cold-bending property, needing to be particularly suitable for the application under the condition of excellent toughness and low-temperature flexibility.
Summary of the invention:
The purpose of this invention is to provide a kind of refined crystalline strengthening structural carbon steel and latten manufacturing process thereof that on existing common full Continuous Heat tandem rolling mill, just can realize industrial mass manufacture, mainly solve the technical problem utilize the carbon structural steel composition on common full Continuous Heat tandem rolling mill, can't produce the hot-rolled sheet of higher-strength at present, the invention provides and have excellent low temperature impact flexible refined crystalline strengthening carbon constructional steel plate.The present invention has designed in a kind of middle carbon with excellent low temperature impact flexible higher-strength that utilizes refined crystalline strengthening manganese carbon structure steel hot rolled steel plate and manufacturing process is produced on the full continuous-rolling of tradition, mainly utilizes the refined crystalline strengthening method.
The technical solution used in the present invention is: a kind ofly can make the refined crystalline strengthening structural carbon steel that obtains on the full Continuous Heat continuous mill of tradition, chemical ingredients (weight percent) is, C:0.14~0.20%, Si:0.10~0.40%, Mn:0.65~0.90%, P≤0.025%, S≤0.015%, all the other are Fe.Microstructure is close grain ferrite and pearlitic structure, and ferrite grain size is 4~7 μ m, and the ferrite grain size rank is 10~13 grades.
A kind of manufacturing process of refined crystalline strengthening structural carbon steel latten, the continuous casting steel billet that will meet the composition requirement is heated to 1210 ℃~1250 ℃, and rough rolling step is 5 passage tandem rollings, and the roughing end temp is 1050~1060 ℃, and intermediate blank thickness is 35~45mm.After finishing, roughing finish rolling is being launched to carry out in the curling back of intermediate blank through the Coil Box volume, finish rolling is 6 passage tandem rollings, the finish rolling start rolling temperature is 920 ℃~940 ℃, the finish rolling end temp is 820 ℃~860 ℃, after the finish rolling, steel plate thickness is 2~8mm, and the laminar flow cooling stages adopts leading portion cold by force, and coiling temperature is 520 ℃~620 ℃.
The invention has the beneficial effects as follows,, adopt the controlled rolling air cooling rolling technology of suitable crystal grain thinning,, obtained a kind of high-intensity structural carbon steel hot rolled steel sheet by refined crystalline strengthening by suitable chemical ingredients proportioning.The advantage of its rolling technology is, at rough rolling step, and by the distortion of austenite recrystallization district five passages, abundant refine austenite crystal grain.In the finish rolling stage, near the distortion one side is passed through 900 ℃ makes the austenite crystal flattening, increases grain boundary area, increases phase deformed nucleus core; Near the distortion of critical austenitic area passing through 850 ℃ on the other hand produces the tiny equiaxial deformation induced ferrite of part in the operation of rolling.In the process of cooling after the finish rolling, the laminar flow cooling by certain intensity suppresses growing up of ferrite crystal grain.The compact grained structural carbon steel hot rolled steel sheet that obtains has high strength, high-elongation, good low-temperature impact toughness, the advantage of low yield tensile ratio.Crystal grain, ferrite grain size are 4~7 μ m, and grain size number is 12 grades.Mechanical property is: yield strength Rel 〉=370MPa, and Rm 〉=490MPa, yield tensile ratio≤0.8, A 〉=30%, wide clod wash 40mm, d=0 is qualified, and (specimen size is 5 * 10 * 55mm) to-40 ℃ of ballistic work Akv 〉=70J.
High strength refined crystalline strengthening structural carbon steel hot rolled steel sheet provided by the invention has the feature of high strength, good low-temperature flexibility, low yield strength ratio, compare with the alloy high strength structural steel and iron that intensity rank is approaching, alloying element content obviously reduces, production cost is low, the low alloy hot rolling structure iron that can substitute prior art production is made engineering structure, automobile component etc., is particularly suitable for the occasion of using at low temperature.
Description of drawings:
Accompanying drawing is the metallographic microstructure photo of refined crystalline strengthening structural carbon steel latten
Embodiment:
The present invention will be further described for 1-4 in conjunction with the embodiments, sees the following form 1,
Table 1 set of dispense ratio of the present invention, the component % that is weight percentage, surplus is Fe.
C Si Mn P S
The present invention 0.14~0.20 0.10~0.40 0.65~0.90 ≤0.025 ≤0.015
Embodiment 1 0.14 0.40 0.90 ≤0.025 ≤0.015
Embodiment 2 0.16 0.31 0.84 ≤0.025 ≤0.015
Embodiment 3 0.18 0.26 0.73 ≤0.025 ≤0.015
Embodiment 4 0.20 0.10 0.65 ≤0.025 ≤0.015
By converter melting obtain the meeting the requirements continuously cast bloom of chemical ingredients, thickness is 200~230mm, and width is 800~1300mm, and length is 5000~10000mm.Rolling manufacturing on full Continuous Heat tandem rolling mill.Technology controlling and process sees the following form 2: wherein roughing is 5 passage tandem rollings, and finish rolling is 6 passage tandem rollings, and the laminar flow cooling stages adopts leading portion cold by force, and finally obtaining sheet gauge is 2~8mm.
Table 2 the invention process processing parameter
Heating temperature Thick finishing temperature Intermediate blank is thick Smart beginning temperature Smart finishing temperature Coiling temperature
The present invention 1210℃~ 1250℃ 1050~ 1060℃ 35~45mm 920℃~ 940℃ 820℃~ 860℃ 520℃~ 620℃
Embodiment 1 1210℃ 1050℃ 35mm 920℃ 820℃ 620℃
Embodiment 2 1220℃ 1050℃ 38mm 930℃ 840℃ 520℃
Embodiment 3 1230℃ 1060℃ 40mm 930℃ 850℃ 600℃
Embodiment 4 1250℃ 1060℃ 45mm 940℃ 860℃ 570℃
Utilize aforesaid method to obtain refined crystalline strengthening structural carbon steel hot rolled steel sheet.With reference to accompanying drawing, microstructure is close grain ferrite and pearlitic structure, and ferrite grain size is 4~7mm, and grain size number is 11~13 grades.Steel plate has high strength, high-elongation, low yield tensile ratio, good toughness plasticity.Sampling detects mechanical property and sees Table 3: the mechanical property of table 3 minute coiled sheet sampling
Figure C20061011667300061
Annotate: Charpy bar is of a size of 5 * 10 * 55mm.

Claims (1)

1, a kind of manufacturing process of refined crystalline strengthening structural carbon steel latten is characterized in that, refined crystalline strengthening structural carbon steel chemical component weight per-cent is, C:0.14~0.20%, Si:0.10~0.40%, Mn:0.65~0.90%, P≤0.025%, S≤0.015%, all the other are Fe; The continuous casting steel billet that will meet the mentioned component requirement is heated to 1210 ℃~1250 ℃, rough rolling step is 5 passage tandem rollings, the roughing end temp is 1050~1060 ℃, intermediate blank thickness is 35~45mm, launch to carry out finish rolling again after through Coil Box intermediate blank being curled after roughing finishes, finish rolling is 6 passage tandem rollings, the finish rolling start rolling temperature is 920 ℃~940 ℃, the finish rolling end temp is 820 ℃~860 ℃, after the finish rolling, steel plate thickness is 2~8mm, and the laminar flow cooling stages adopts leading portion cold by force, and coiling temperature is 520 ℃~620 ℃.
CNB2006101166739A 2006-09-28 2006-09-28 Manufacturing process of fine crystal strengthened carbon constructional steel hot-rolling thin slab Expired - Fee Related CN100516269C (en)

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