CN109487164A - Steel tower 420MPa grades of hot rolling weather-resisting angle steel of surrender and its production method - Google Patents
Steel tower 420MPa grades of hot rolling weather-resisting angle steel of surrender and its production method Download PDFInfo
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- CN109487164A CN109487164A CN201811526318.8A CN201811526318A CN109487164A CN 109487164 A CN109487164 A CN 109487164A CN 201811526318 A CN201811526318 A CN 201811526318A CN 109487164 A CN109487164 A CN 109487164A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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Abstract
The invention discloses a kind of steel tower 420MPa grades of hot rolling weather-resisting angle steel of surrender and its production method, hot rolling weather-resisting angle steel chemical component composition and mass percentage are as follows: C:0.05-0.12%, Si:0.10-0.60%, Mn:0.80-1.50%, P≤0.015%, S≤0.015%, Cr:0.50-1.00%, Ni:0.10-0.60%, Cu:0.15-0.50%, Alt >=0.015%, V:0.05-0.15%, N:0.0100-0.0150%, Ca:0.0020-0.0060%, remaining is Fe and inevitable impurity element；Preparation method includes smelting, continuous casting, heating, rolling, cooling process.The present invention can produce the 420MPa grades of hot rolling weather-resisting angle steel of surrender of the steel tower with atmospheric corrosion resistance in batches under the conditions of existing angle steel production equipment.
Description
Technical field
The invention belongs to metallurgical technology fields, and in particular to a kind of steel tower 420MPa grades of hot rolling weather-resisting angle steel of surrender and its
Production method.
Background technique
For many years, electric power pylon manufacture in China's is mainly based on hot-rolled angle steel, steel based below 345MPa rank,
Supplemented by 420MPa rank.Angle steel material is after through blanking, punching, examination assembling etc., processes are installed, need to be exposed to atmosphere it
In.Corrosive gas in atmosphere, such as SO2It can be entered in vapor or rainwater Deng when weather is dark and damp, form free H+
Ion, hydrogen ion inevitably occur electrochemical reaction after contacting with steel, steel surface are caused to corrode.Long-term corrosion
After, thickness of steel product reduces, and the decline of steel tower integral strength causes the steel tower service life to decline, and will bring a series of risks.It is big to reduce
Gas and raindrop erosion, hot-rolled angle steel are assembled into before steel tower and reduce atmospheric corrosion for pickling+hot dipping zinc technology is carried out.It is this anti-
Rotten technique, on the one hand generating acid mist in pickling link will bring pollution and galvanizing process that will have much to atmospheric environment
Toxic zinc cigarette enters in air, brings pollution to worker's health and environment.On the other hand, pickling+zincincation at
This is higher, is roughly equal to 1500 yuan/ton, and zinc coat can be caused to fall off because of heated or stress in pad, bolt fastening point, Wu Faqi
To antisepsis.And exactly these points are the structural key points that rainwater is easy that aggregation is not easy rapid evaporation, flows down.It is overall next
It says, zincincation all has from the point of view of environmental protection angle, worker's health angle, cost angle and aseptic technic angle
Certain limitation.
Because what electric power pylon used is mostly 345MPa grades resistance to before China 420MPa grades of hot-rolled angle steel quality is stablized
Wait angle steel.To guarantee steel tower intensity, when design, relative to 420MPa grades of hot-rolled angle steels, the material of 345 rank angle steel needs
Gauge lattice and thickness are bigger, cause steel tower substance big, and material consumption is high.The exploitation and replacement of 420MPa grades of hot-rolled angle steels, favorably
In steel tower loss of weight, material consumption is saved, saves energy consumption and pollutant emission in Material Manufacturing Process.Using high-intensitive grade
Other material realizes loss of weight emission reduction to the substitution of low-intensity grade material, is the developing direction of the following steel construction product.
Therefore, a kind of high intensity levels are developed, there is certain corrosion proof hot rolling weather-resisting angle steel material, to electric power pylon row
Have far-reaching significance in terms of industry or even human environment.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of steel tower 420MPa grades of hot rolling weather-resisting angle steel of surrender and its life
Production method.
In order to solve the above technical problems, the technical solution adopted by the present invention is that: a kind of steel tower 420MPa grades of hot rollings of surrender
Weather-proof angle steel, the hot rolling weather-resisting angle steel chemical component composition and its mass percentage are as follows: C:0.05-0.12%, Si:
0.10-0.60%, Mn:0.80-1.50%, P≤0.015%, S≤0.015%, Cr:0.50-1.00%, Ni:0.10-
0.60%, Cu:0.15-0.50%, Alt >=0.015%, V:0.05-0.15%, N:0.0100-0.0150%, Ca:0.0020-
0.0060%, remaining is Fe and inevitable impurity element.
Hot rolling weather-resisting angle steel chemical component composition and its mass percentage of the present invention are preferred: C:0.07-0.12%,
Si:0.15-0.47%, Mn:0.85-1.41%, P≤0.013%, S≤0.007%, Cr:0.52-0.83%, Ni:0.18-
0.55%, Cu:0.18-0.42%, Alt >=0.019%, V:0.06-0.14%, N:0.0107-0.0142%, Ca:0.0025-
0.0052%, remaining is Fe and inevitable impurity element.
Hot rolling weather-resisting angle steel chemical component composition and its mass percentage of the present invention are preferred: C:0.12%, Si:
0.15%, Mn:0.85%, P:0.013%, S:0.007%, Cr:0.52%, Ni:0.18%, Cu:0.42%, Alt:
0.021%, V:0.06%, N:0.0142%, Ca:0.0025%, remaining is Fe and inevitable impurity element.
Hot rolling weather-resisting angle steel chemical component composition and its mass percentage of the present invention are preferred: C:0.07%, Si:
0.47%, Mn:1.41%, P:0.012%, S:0.004%, Cr:0.83%, Ni:0.55%, Cu:0.18%, Alt:
0.019%, V:0.14%, N:0.0107%, Ca:0.0052%, remaining is Fe and inevitable impurity element.
Hot rolling weather-resisting angle steel specification of the present invention is 40 × 3mm- of ∠ ∠, 300 × 35mm.
Hot rolling weather-resisting angle steel yield strength >=420MPa of the present invention, tensile strength 500-680MPa, elongation >=
18%, ballistic work >=14J.
The present invention also provides a kind of steel tower production method of 420MPa grades of hot rolling weather-resisting angle steel of surrender, the producers
Method includes smelting, continuous casting, heating, rolling, cooling process；The smelting procedure, tapping ladle chemistry composition and its quality
Percentage composition are as follows: C:0.05-0.12%, Si:0.10-0.60%, Mn:0.80-1.50%, P≤0.015%, S≤0.015%,
Cr:0.50-1.00%, Ni:0.10-0.60%, Cu:0.15-0.50%, Alt >=0.015%, V:0.05-0.15%, N:
0.0100-0.0150%, Ca:0.0020-0.0060%, remaining is Fe and inevitable impurity element.
Continuous casting working procedure of the present invention, by the steel tower various chemical component smeltings of 420MPa grades of hot rolling weather-resisting angle steel of surrender
Refining, is cast into continuous-cast blank, by slab cooling to room temperature in such a way that wind sheltering heap is cold；The heating process, soaking temperature control
System keeps the temperature 110-130min at 1150-1220 DEG C.
Rolling process of the present invention, 900-1000 DEG C of finishing temperature, rolls total compression by 1030-1100 DEG C of start rolling temperature
Than >=5.
Cooling process of the present invention, it is air-cooled to the angle steel progress after rolling, it obtains steel tower and surrenders 420MPa grades of hot rollings
Weather-proof angle steel.
The chemical component mechanism of action and content of the present invention determine:
C is the essential element that iron is only second in steel, it directly affects intensity, plasticity, toughness and the welding performance of steel.?
In certain content range, with the increase of phosphorus content, the intensity and hardness of steel are improved, but plasticity, toughness, welding performance, resistance to
Performance decline is waited, it is C:0.05-0.12% that the present invention, which uses lower C element content, can reduce C to weldability and weather-proof
The influence of property.
P element is to improve one of most effective element of steel corrosion resistance, but P is easily in austenite grain boundary segregation, serious shadow
The low-temperature flexibility of steel is rung, for the cold brittleness for avoiding material, the present invention does not use the corrosion resisting property of P element, but P content is controlled
It is being lower than 0.015% range.
Outstanding role of the Cu in steel is the weather-resistant effect for improving ordinary low-alloy steel, but Cu content reaches
Its corrosion-resistant effect is almost saturated after 0.60%, and continuing growing Cu content will be unfavorable to welding performance and red brittleness generation
It influences.Therefore, the present invention controls Cu content for 0.15-0.50%.
Fine and close oxidation film will be generated after Cr oxidation in steel surface, therefore there is good oxidative resistance corrosiveness,
While the intensity of steel can be improved without reducing toughness in Cr element, but excessively high Cr content will affect welding performance, therefore this hair
It is bright to control Cr content for 0.50-1.00%.
Ni has high corrosion resistance, while the intensity, toughness and harden ability of steel can be improved.When Ni content reaches
When 0.30%, i.e. can reach -100 DEG C can greatly improve steel hereinafter, a certain amount of Ni content is added to brittle transition temperature
Corrosion resistance and low-temperature flexibility.Therefore the present invention controls Ni content for 0.10-0.60%.
Si is the important deoxidier and reducing agent of steelmaking process, can be dissolved in the intensity that steel is improved in ferrite and austenite
And hardness, when steel containing Si is heated in oxidizing atmosphere, surface will form one layer of SiO2Film, to improve material at high temperature
Inoxidizability.Though but Si too high levels can improve the intensity of steel, can reduce the plasticity and toughness of steel, therefore the design of Si content is existed
Within the scope of 0.10-0.60%.
Mn clearly, and can infinitely be dissolved, therefore it is improving steel strength the contribution of steel strength with Fe
While the smaller but excessively high Mn content of influence to plasticity will have an adverse effect to the welding performance of steel, thus this hair
It is bright to control Mn content for 0.80-1.50%.
V, N and carbon, nitrogen, oxygen have extremely strong affinity, and form stable compound therewith.Carbon, vanadium nitride are as precipitation
Object will prevent crystal grain in heating process from growing up, to reach fine grain effect.The refinement of crystal grain and vanadium carbide nitride itself are to steel
The contribution of performance will greatly improve steel yield strength index.Thus the present invention controls V content contains for 0.05-0.15%, N
Amount control is 0.0100-0.0150%.
Al element is common deoxidant element, when being added in steel as alloy element, can obviously refine crystal grain, Gu
Determine the N in steel, to significantly improve the impact flexibility of steel, while cold short tendency and timeliness tendentiousness can also be reduced, with Mo, Cu,
The elements such as Si, Cr are used cooperatively, moreover it is possible to improve the corrosion resistance of steel.But excessively high Al content will affect the hot-working character of steel
And machinability, thus the Al content in designing material is not less than 0.015%.
Ca: in steel plus calcium can refine crystal grain, partial desulfurization, and change ingredient, quantity and the form of non-metallic inclusion, with
Add the substantially similar corrosion resistance and cryogenic property that can also improve steel of effect of rare earth in steel；Improve impact flexibility, the fatigue of steel
Intensity, plasticity and welding performance.Thus present invention control Ca content range is 0.0020-0.0060%.
Steel tower of the present invention is low with 420MPa grades of hot rolling weather-resisting angle steel mechanical property canonical reference GB/T 1591-2008 of surrender
Alloy high strength steel；The test reference GB/T228.1-2010 metal material stretching test part 1 of product mechanical property: room temperature
Test method and GB/T229-2007 metal material Charpy pendulum impact test method；The test of product corrosive nature according to
TB/T 2375-1993 railway is carried out with weathering steel alternate-immersion test method.
The beneficial effects of adopting the technical scheme are that 1, the present invention in terms of composition design using low C content,
Certain V, N is added, acts on proof strength using the precipitation strength of vanadium carbide nitride；By reducing C, Mn content, it is added certain
Cr, Ni, Cu, Ca element improve weather resistance, realize the steel tower exploitation of 420MPa grades of hot rolling weather-resisting angle steel of surrender.2, of the invention
It can be raw using smelting, continuous casting, heating, rolling, the cooling process system batch combined under the conditions of existing angle steel production equipment
Output has the steel tower of atmospheric corrosion resistance 420MPa grades of hot rolling weather-resisting angle steel of surrender.3, hot rolling weather-resisting angle steel surrender of the present invention is strong
Degree >=420MPa, tensile strength 500-680MPa, elongation >=18%, impact >=14J.
Detailed description of the invention
Fig. 1 is that 1 steel tower of embodiment surrenders 420MPa grades of hot rolling weather-resisting angle steel metallographic structure figures, 200X；
Fig. 2 is that 2 steel tower of embodiment surrenders 420MPa grades of hot rolling weather-resisting angle steel metallographic structure figures, 200X；
Fig. 3 is that 3 steel tower of embodiment surrenders 420MPa grades of hot rolling weather-resisting angle steel metallographic structure figures, 200X；
Fig. 4 is that 4 steel tower of embodiment surrenders 420MPa grades of hot rolling weather-resisting angle steel metallographic structure figures, 200X；
Fig. 5 is that 5 steel tower of embodiment surrenders 420MPa grades of hot rolling weather-resisting angle steel metallographic structure figures, 200X；
Fig. 6 is that 6 steel tower of embodiment surrenders 420MPa grades of hot rolling weather-resisting angle steel metallographic structure figures, 200X；
Fig. 7 is that 7 steel tower of embodiment surrenders 420MPa grades of hot rolling weather-resisting angle steel metallographic structure figures, 200X；
Fig. 8 is that 1 steel tower of comparative example surrenders 420MPa grades of hot rolling weather-resisting angle steel metallographic structure figures, 200X；
Fig. 9 is that 2 steel tower of comparative example surrenders 420MPa grades of hot rolling weather-resisting angle steel metallographic structure figures, 200X.
Specific embodiment
Present invention will be explained in further detail in the following with reference to the drawings and specific embodiments.
Embodiment 1
The present embodiment steel tower is 120 × 120 × 10mm of ∠ with 420MPa grade hot rolling weather-resisting angle steel specifications of surrender, it is chemical at
It is grouped as and mass percentage is shown in Table 1.
The production method that the present embodiment steel tower surrenders 420MPa grades of hot rolling weather-resisting angle steel includes smelting, continuous casting, heats, rolls
System, cooling process, specific process step are as described below:
(1) smelting procedure: tapping ladle chemistry composition and its mass percentage are shown in Table 1；
(2) continuous casting working procedure: smelting molten steel is cast into continuous-cast blank, by slab cooling to room in such a way that wind sheltering heap is cold
Temperature；
(3) heating process: soaking temperature is controlled at 1163 DEG C, keeps the temperature 120min；
(4) rolling process: 1035 DEG C of start rolling temperature, 908 DEG C of finishing temperature, rolling overall compression ratio is 5.4；
(5) cooling process: it is air-cooled to the angle steel progress after rolling, it obtains steel tower and surrenders 420MPa grades of hot rolling weather-resisting angles
Steel.
The present embodiment steel tower is shown in Table 2 with 420MPa grades of hot rolling weather-resisting angle steel performance indicators of surrender, and metallographic structure figure is shown in Fig. 1,
Corrosion resistance is shown in Table 3, table 4.
Embodiment 2
The present embodiment steel tower is 200 × 200 × 18mm of ∠ with 420MPa grade hot rolling weather-resisting angle steel specifications of surrender, it is chemical at
It is grouped as and mass percentage is shown in Table 1.
The production method that the present embodiment steel tower surrenders 420MPa grades of hot rolling weather-resisting angle steel includes smelting, continuous casting, heats, rolls
System, cooling process, specific process step are as described below:
(1) smelting procedure: tapping ladle chemistry composition and its mass percentage are shown in Table 1；
(2) continuous casting working procedure: smelting molten steel is cast into continuous-cast blank, by slab cooling to room in such a way that wind sheltering heap is cold
Temperature；
(3) heating process: soaking temperature is controlled at 1208 DEG C, keeps the temperature 120min；
(4) rolling process: 1096 DEG C of start rolling temperature, 975 DEG C of finishing temperature, rolling overall compression ratio is 5.8；
(5) cooling process: it is air-cooled to the angle steel progress after rolling, it obtains steel tower and surrenders 420MPa grades of hot rolling weather-resisting angles
Steel.
The present embodiment steel tower is shown in Table 2 with 420MPa grades of hot rolling weather-resisting angle steel performance indicators of surrender, and metallographic structure figure is shown in Fig. 2,
Corrosion resistance is shown in Table 3, table 4.
Embodiment 3
The present embodiment steel tower is 40 × 40 × 3mm of ∠, chemical component with 420MPa grades of hot rolling weather-resisting angle steel specifications of surrender
Composition and mass percentage are shown in Table 1.
The production method that the present embodiment steel tower surrenders 420MPa grades of hot rolling weather-resisting angle steel includes smelting, continuous casting, heats, rolls
System, cooling process, specific process step are as described below:
(1) smelting procedure: tapping ladle chemistry composition and its mass percentage are shown in Table 1；
(2) continuous casting working procedure: smelting molten steel is cast into continuous-cast blank, by slab cooling to room in such a way that wind sheltering heap is cold
Temperature；
(3) heating process: soaking temperature is controlled at 1150 DEG C, keeps the temperature 130min；
(4) rolling process: 1030 DEG C of start rolling temperature, 900 DEG C of finishing temperature, rolling overall compression ratio is 6；
(5) cooling process: it is air-cooled to the angle steel progress after rolling, it obtains steel tower and surrenders 420MPa grades of hot rolling weather-resisting angles
Steel.
The present embodiment steel tower is shown in Table 2 with 420MPa grades of hot rolling weather-resisting angle steel performance indicators of surrender, and metallographic structure figure is shown in Fig. 3,
Corrosion resistance is shown in Table 3, table 4.
Embodiment 4
The present embodiment steel tower is 300 × 300 × 35mm of ∠ with 420MPa grade hot rolling weather-resisting angle steel specifications of surrender, it is chemical at
It is grouped as and mass percentage is shown in Table 1.
The production method that the present embodiment steel tower surrenders 420MPa grades of hot rolling weather-resisting angle steel includes smelting, continuous casting, heats, rolls
System, cooling process, specific process step are as described below:
(1) smelting procedure: tapping ladle chemistry composition and its mass percentage are shown in Table 1；
(2) continuous casting working procedure: smelting molten steel is cast into continuous-cast blank, by slab cooling to room in such a way that wind sheltering heap is cold
Temperature；
(3) heating process: soaking temperature is controlled at 1220 DEG C, keeps the temperature 110min；
(4) rolling process: 1100 DEG C of start rolling temperature, 1000 DEG C of finishing temperature, rolling overall compression ratio is 5；
(5) cooling process: it is air-cooled to the angle steel progress after rolling, it obtains steel tower and surrenders 420MPa grades of hot rolling weather-resisting angles
Steel.
The present embodiment steel tower is shown in Table 2 with 420MPa grades of hot rolling weather-resisting angle steel performance indicators of surrender, and metallographic structure figure is shown in Fig. 4,
Corrosion resistance is shown in Table 3, table 4.
Embodiment 5
The present embodiment steel tower is 80 × 80 × 5mm of ∠, chemical component with 420MPa grades of hot rolling weather-resisting angle steel specifications of surrender
Composition and mass percentage are shown in Table 1.
The production method that the present embodiment steel tower surrenders 420MPa grades of hot rolling weather-resisting angle steel includes smelting, continuous casting, heats, rolls
System, cooling process, specific process step are as described below:
(1) smelting procedure: tapping ladle chemistry composition and its mass percentage are shown in Table 1；
(2) continuous casting working procedure: smelting molten steel is cast into continuous-cast blank, by slab cooling to room in such a way that wind sheltering heap is cold
Temperature；
(3) heating process: soaking temperature is controlled at 1182 DEG C, keeps the temperature 128min；
(4) rolling process: 1050 DEG C of start rolling temperature, 945 DEG C of finishing temperature, rolling overall compression ratio is 5.7；
(5) cooling process: it is air-cooled to the angle steel progress after rolling, it obtains steel tower and surrenders 420MPa grades of hot rolling weather-resisting angles
Steel.
The present embodiment steel tower is shown in Table 2 with 420MPa grades of hot rolling weather-resisting angle steel performance indicators of surrender, and metallographic structure figure is shown in Fig. 5,
Corrosion resistance is shown in Table 3, table 4.
Embodiment 6
The present embodiment steel tower is 150 × 150 × 12mm of ∠ with 420MPa grade hot rolling weather-resisting angle steel specifications of surrender, it is chemical at
It is grouped as and mass percentage is shown in Table 1.
The production method that the present embodiment steel tower surrenders 420MPa grades of hot rolling weather-resisting angle steel includes smelting, continuous casting, heats, rolls
System, cooling process, specific process step are as described below:
(1) smelting procedure: tapping ladle chemistry composition and its mass percentage are shown in Table 1；
(2) continuous casting working procedure: smelting molten steel is cast into continuous-cast blank, by slab cooling to room in such a way that wind sheltering heap is cold
Temperature；
(3) heating process: soaking temperature is controlled at 1213 DEG C, keeps the temperature 116min；
(4) rolling process: 1045 DEG C of start rolling temperature, 933 DEG C of finishing temperature, rolling overall compression ratio is 5.8；
(5) cooling process: it is air-cooled to the angle steel progress after rolling, it obtains steel tower and surrenders 420MPa grades of hot rolling weather-resisting angles
Steel.
The present embodiment steel tower is shown in Table 2 with 420MPa grades of hot rolling weather-resisting angle steel performance indicators of surrender, and metallographic structure figure is shown in Fig. 6,
Corrosion resistance is shown in Table 3, table 4.
Embodiment 7
The present embodiment steel tower is 250 × 250 × 20mm of ∠ with 420MPa grade hot rolling weather-resisting angle steel specifications of surrender, it is chemical at
It is grouped as and mass percentage is shown in Table 1.
The production method that the present embodiment steel tower surrenders 420MPa grades of hot rolling weather-resisting angle steel includes smelting, continuous casting, heats, rolls
System, cooling process, specific process step are as described below:
(1) smelting procedure: tapping ladle chemistry composition and its mass percentage are shown in Table 1；
(2) continuous casting working procedure: smelting molten steel is cast into continuous-cast blank, by slab cooling to room in such a way that wind sheltering heap is cold
Temperature；
(3) heating process: soaking temperature is controlled at 1191 DEG C, keeps the temperature 124min；
(4) rolling process: 1088 DEG C of start rolling temperature, 985 DEG C of finishing temperature, rolling overall compression ratio is 6；
(5) cooling process: it is air-cooled to the angle steel progress after rolling, it obtains steel tower and surrenders 420MPa grades of hot rolling weather-resisting angles
Steel.
The present embodiment steel tower is shown in Table 2 with 420MPa grades of hot rolling weather-resisting angle steel performance indicators of surrender, and metallographic structure figure is shown in Fig. 7,
Corrosion resistance is shown in Table 3, table 4.
Comparative example 1
The present embodiment steel tower is 120 × 120 × 10mm of ∠ with 420MPa grade hot rolling weather-resisting angle steel specifications of surrender, it is chemical at
It is grouped as and mass percentage is shown in Table 1.
The production method that the present embodiment steel tower surrenders 420MPa grades of hot rolling weather-resisting angle steel includes smelting, continuous casting, heats, rolls
System, cooling process, specific process step are as described below:
(1) smelting procedure: tapping ladle chemistry composition and its mass percentage are shown in Table 1；
(2) continuous casting working procedure: smelting molten steel is cast into continuous-cast blank, by slab cooling to room in such a way that wind sheltering heap is cold
Temperature；
(3) heating process: soaking temperature is controlled at 1193 DEG C, keeps the temperature 120min；
(4) rolling process: 1032 DEG C of start rolling temperature, 923 DEG C of finishing temperature, rolling overall compression ratio is 5.4；
(5) cooling process: it is air-cooled to the angle steel progress after rolling, it obtains steel tower and surrenders 420MPa grades of hot rolling weather-resisting angles
Steel.
The present embodiment steel tower is shown in Table 2 with 420MPa grades of hot rolling weather-resisting angle steel performance indicators of surrender, and metallographic structure figure is shown in Fig. 8,
Corrosion resistance is shown in Table 3, table 4.
Comparative example 2
The present embodiment steel tower is 200 × 200 × 18mm of ∠ with 420MPa grade hot rolling weather-resisting angle steel specifications of surrender, it is chemical at
It is grouped as and mass percentage is shown in Table 1.
The production method that the present embodiment steel tower surrenders 420MPa grades of hot rolling weather-resisting angle steel includes smelting, continuous casting, heats, rolls
System, cooling process, specific process step are as described below:
(1) smelting procedure: tapping ladle chemistry composition and its mass percentage are shown in Table 1；
(2) continuous casting working procedure: smelting molten steel is cast into continuous-cast blank, by slab cooling to room in such a way that wind sheltering heap is cold
Temperature；
(3) heating process: soaking temperature is controlled at 1213 DEG C, keeps the temperature 120min；
(4) rolling process: 1089 DEG C of start rolling temperature, 985 DEG C of finishing temperature, overall compression ratio 5.8 is rolled；
(5) cooling process: it is air-cooled to the angle steel progress after rolling, it obtains steel tower and surrenders 420MPa grades of hot rolling weather-resisting angles
Steel.
The present embodiment steel tower is shown in Table 2 with 420MPa grades of hot rolling weather-resisting angle steel performance indicators of surrender, and metallographic structure figure is shown in Fig. 9,
Corrosion resistance is shown in Table 3, table 4.
1 embodiment of table and comparative example steel tower 420MPa grades of hot rolling weather-resisting angle steel chemical components compositions of surrender and quality percentage
Content (%)
Ingredient surplus is Fe and inevitable impurity element in table 1.
2 steel tower of table 420MPa grades of hot rolling weather-resisting angle steel mechanical properties of surrender
3 steel tower of table 420MPa grades of hot rolling weather-resisting angle steel corrosion resistances of surrender
4 steel tower of table is surrendered 420MPa grades of hot rolling weather-resisting angle steel corrosion resistances and is compared
Note: the calculation formula of relatively corrosive rate are as follows: under same abrasion cycle, corrosion rate/comparison of embodiment material
The corrosion rate of example material.
It is used and is bent by the steel tower of embodiment 1-7 it can be seen from the corrosion resistance and relatively corrosive speed data of table 3 and table 4
Take the steel tower 420MPa grades of hot rolling weather-resisting angles of surrender that 420MPa grades of hot rolling weather-resisting angle steel corrosion resistances are much better than comparative example 1-2
Steel.
The above embodiments are only used to illustrate and not limit the technical solutions of the present invention, although referring to above-described embodiment to this hair
It is bright to be described in detail, those skilled in the art should understand that: still the present invention can be modified or be waited
With replacement, without departing from the spirit or scope of the invention, or any substitutions, should all cover in power of the invention
In sharp claimed range.
Claims (10)
1. a kind of steel tower 420MPa grades of hot rolling weather-resisting angle steel of surrender, which is characterized in that the hot rolling weather-resisting angle steel chemical component
Composition and its mass percentage are as follows: C:0.05-0.12%, Si:0.10-0.60%, Mn:0.80-1.50%, P≤0.015%, S≤
0.015%, Cr:0.50-1.00%, Ni:0.10-0.60%, Cu:0.15-0.50%, Alt >=0.015%, V:0.05-0.15%, N:
0.0100-0.0150%, Ca:0.0020-0.0060%, remaining is Fe and inevitable impurity element.
2. a kind of steel tower according to claim 1 420MPa grades of hot rolling weather-resisting angle steel of surrender, which is characterized in that the heat
It rolls weather-proof angle steel chemical component composition and its mass percentage is preferred: C:0.07-0.12%, Si:0.15-0.47%, Mn:
0.85-1.41%, P≤0.013%, S≤0.007%, Cr:0.52-0.83%, Ni:0.18-0.55%, Cu:0.18-0.42%, Alt
>=0.019%, V:0.06-0.14%, N:0.0107-0.0142%, Ca:0.0025-0.0052%, remaining is for Fe and inevitably
Impurity element.
3. a kind of steel tower according to claim 1 420MPa grades of hot rolling weather-resisting angle steel of surrender, which is characterized in that the heat
It rolls weather-proof angle steel chemical component composition and its mass percentage is preferred: C:0.12%, Si:0.15%, Mn:0.85%, P:
0.013%, S:0.007%, Cr:0.52%, Ni:0.18%, Cu:0.42%, Alt:0.021%, V:0.06%, N:0.0142%, Ca:
0.0025%, remaining is Fe and inevitable impurity element.
4. a kind of steel tower according to claim 1 420MPa grades of hot rolling weather-resisting angle steel of surrender, which is characterized in that the heat
It rolls weather-proof angle steel chemical component composition and its mass percentage is preferred: C:0.07%, Si:0.47%, Mn:1.41%, P:
0.012%, S:0.004%, Cr:0.83%, Ni:0.55%, Cu:0.18%, Alt:0.019%, V:0.14%, N:0.0107%, Ca:
0.0052%, remaining is Fe and inevitable impurity element.
5. a kind of steel tower according to claim 1 420MPa grades of hot rolling weather-resisting angle steel of surrender, which is characterized in that the heat
Rolling weather-proof angle steel specification is 40 × 3mm- of ∠ ∠, 300 × 35mm.
6. a kind of steel tower according to claim 1 420MPa grades of hot rolling weather-resisting angle steel of surrender, which is characterized in that the heat
Roll weather-proof angle steel yield strength >=420MPa, tensile strength 500-680MPa, elongation >=18%, ballistic work >=14J.
7. based on a kind of producer of steel tower 420MPa grades of hot rolling weather-resisting angle steel of surrender as claimed in any one of claims 1 to 6
Method, which is characterized in that the production method includes smelting, continuous casting, heating, rolling, cooling process；The smelting procedure, tapping
Ladle chemistry composition and its mass percentage are as follows: C:0.05-0.12%, Si:0.10-0.60%, Mn:0.80-1.50%, P
≤ 0.015%, S≤0.015%, Cr:0.50-1.00%, Ni:0.10-0.60%, Cu:0.15-0.50%, Alt >=0.015%, V:
0.05-0.15%, N:0.0100-0.0150%, Ca:0.0020-0.0060%, remaining is Fe and inevitable impurity element.
8. a kind of production method of the steel tower according to claim 7 with 420MPa grades of hot rolling weather-resisting angle steel of surrender, feature
It is, the continuous casting working procedure, the steel tower various chemical components for surrendering 420MPa grades of hot rolling weather-resisting angle steel is smelted, the company of being cast into
Slab is cast, by slab cooling to room temperature in such a way that wind sheltering heap is cold；The heating process, soaking temperature are controlled in 1150-
1220 DEG C, keep the temperature 110-130min.
9. a kind of production method of the steel tower according to claim 7 with 420MPa grades of hot rolling weather-resisting angle steel of surrender, feature
It is, the rolling process, 1030-1100 DEG C of start rolling temperature, 900-1000 DEG C of finishing temperature, rolls overall compression ratio >=5.
10. a kind of production of steel tower 420MPa grades of hot rolling weather-resisting angle steel of surrender according to claim 7-9 any one
Method, which is characterized in that the cooling process, it is air-cooled to the angle steel progress after rolling, it obtains steel tower and surrenders 420MPa grades of heat
Roll weather-proof angle steel.
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Cited By (1)
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| CN114381660A (en) * | 2021-12-07 | 2022-04-22 | 唐山中厚板材有限公司 | Galvanizing-free high-strength angle steel and production method thereof |
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Application publication date: 20190319 |