CN103194695B - Steel with stable oxide layer for pretreatment-free high-strength container and manufacture method of steel - Google Patents

Steel with stable oxide layer for pretreatment-free high-strength container and manufacture method of steel Download PDF

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CN103194695B
CN103194695B CN201310117108.4A CN201310117108A CN103194695B CN 103194695 B CN103194695 B CN 103194695B CN 201310117108 A CN201310117108 A CN 201310117108A CN 103194695 B CN103194695 B CN 103194695B
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steel
temperature
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CN103194695A (en
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杨奕
韩斌
蒋扬虎
刘洋
谭文
汪水泽
汪荣
魏兵
陈丽娟
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Wuhan Iron and Steel Co Ltd
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Wuhan Iron and Steel Group Corp
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Abstract

The invention discloses steel with a stable oxide layer for a pretreatment-free high-strength container and a manufacture method of the steel disclosed by the invention. The steel disclosed by the invention comprises the following chemical components in percentage by weight: 0.01-0.03% of C, 0.05-0.25% of Si, 1.4-1.6% of Mn, less than or equal to 0.008% of S, less than or equal to 0.05% of P, 0.25-0.40% of Cu, 0.25-0.50% of Cr, 0.22-0.30% of Ni, 0.02-0.03% of Nb and the balance of iron and inevitable impurities. The manufacture method of the steel disclosed by the invention is carried out according to the general pure steel process and comprises the following steps of: desulfurizing molten iron, smelting via a converter, refining via an LF (ladle furnace), refining via an RH (Rockwell Hardness) furnace, heating plate blanks, performing hot continuous rolling, cooling back section and reeling. The practice proves that the steel disclosed by the invention has the advantages of good integral corrosion resistance and high strength; meanwhile, the steel disclosed by the invention can be directly used for coating in the process of manufacturing the container without the pre-treating non-environmentally friendly pretreatment processes of blasting sand and blasting shots and has no negative influence on the coating quality and the coating property; and an oxide iron layer and a coating system are closely combined, so that the steel is good in compatibility. The manufacture method of the steel disclosed by the invention is simple in process flows and low in production cost.

Description

There is stable zone of oxidation and exempt from pre-treatment High Strength Container steel and manufacture method thereof
Technical field
The invention belongs to hot rolled strip production technical field, refer to that one has stable zone of oxidation and exempts from pre-treatment High Strength Container steel and manufacture method thereof particularly.
Background technology
Steel products long-term exposure in atmosphere, corrode by the erosion of moisture, gas, microorganism etc. that its ferrous materials used can be subject in environment, and the work on freight container and sea going naval vessel etc. and applied environment more severe.Container production producer, in order to reduce casing deadweight, increases shock resistance, improves loading weight, starts to adopt high-strength steel to manufacture freight container.In order to the weather resistance making the steel for container of high strength reach good, generally all with the addition of the noble metals such as more Cu, Ni, Cr, Mo or rare earth, and carry out paint spraying on surface and prevent it from corroding further, extend its time limit of service.But along with the development of national economy, country is more and more stricter to the requirement of environmental protection, and propose the requirement of " energy-saving and emission-reduction ", this is also more and more higher to the requirement of steel products.With the addition of the noble metals such as too much Cu, Ni, Mo or rare earth, not only consume valuable resource, also bring the increase of production cost.
Use the surface requirements of coating process to steel of coating higher at freight container, degree of cleaning aspect requires that can not there be residual oxidization iron sheet, iron rust or other dirts in its surface; Based on the consideration of coating adhesion and protective value thereof, require that steel surface has certain roughness.Therefore, before application, generally the surface treatments such as sandblasting, ball blast or phosphatization are carried out to steel surface.Sandblasting and ball blast pre-treatment cause larger dust pollution in process of production, and noise is comparatively large, severe exacerbation operating environment and add process cost.Therefore, manufacturer, based on the consideration of cost efficiency and environmental protection aspect, ites is desirable to carry out steel and exempt from sandblasting and ball blast pre-treatment, directly carry out application to it, and can not cause disadvantageous effect to coating quality, coating performance.
The method of the High Strength Container steel of existing production is general all only from high-strength and add the local that Cu, Ni, Cr, Mo or rare earth reach corrosion resisting property and consider, not from the mechanical property of entirety thinking High Strength Container steel, overall weather resistance and ferric oxide cortex, reach and can exempt from sandblasting and ball blast pre-treatment, have again high-strength and excellent corrosion resistance nature.
Application number is the Chinese invention patent of 201010578817.9, disclose a kind of manufacture method of container steel plate, chemical Composition Control exists: C is 0.04-0.05%, Si be 0.20-0.30%, Mn be 1.80-2.0%, P be < 0.092%, S be < 0.0028%, N be < 0.004%, Nb be 0.04-0.05%, B be < 0.002%, Ni be 0.2-0.4%, Cr be 0.3-0.5%, Cu be 0.3-0.5%, Ti is 0.01-0.03%, and all the other are Fe and inevitable impurity.After heating of plate blank is incubated 1 ~ 2 hour to 1250 DEG C, the start rolling temperature carrying out hot rolling is 1050 ~ 1100 DEG C, and finishing temperature 780 ~ 830 DEG C, carries out section cooling with the cooling rate of 20 ~ 30 DEG C/s, is cooled to coiling temperature 500 ~ 510 DEG C to be incubated.The container steel plate that this method is produced, with the addition of more Nb, Ti alloy, easy formation carbon nitrogen compound, forms more negative electrode at steel grade, reduces the corrosion resisting property of steel plate, the content of noble metal Cu, Cr, Ni etc. is higher simultaneously, although the corrosion resisting property of improve, increase substantially production cost, and, interpolation meeting segregation on austenite grain boundary of B element, forms the boron phase reducing container steel toughness.Application number is the Chinese invention patent of 200510111858.6, discloses a kind of production method of air corrosion resisting high strength low alloy metal being applicable to railway, road vehicle structure, freight container, bridge, building structure, tower mast rail post.It is elementary composition that its composition have employed the V-N steel such as Cu-Cr-Ni and Nb, Ti, Mo.The process employs the rolling mode of controlled rolling and controlled cooling, do not need to heat-treat, the weather resisting steel yield strength rank produced is 550MPa.Equally, the method is also that in the corrosion resisting property that mainly mechanical property and expensive alloying elements bring emphatically, its production cost is high, is unsuitable for applying.The patent No. is U.S. patent Nos " the THERMOMECHANICALLY CONTROLLED PROCESSED HIGH STRENGTH WEATHERING STEEL WITH LOWYIELD/TENSILE RATIO of US6056833; HOT ROLLED, AIR COOLED; PEARLITE-FREE ", adopt Cu-Cr-Ni weathering resistance Composition Design and the design of Nb-Ti-Mo microalloy, but this patent with the addition of the V element of 0.06-0.14% especially.The interpolation of V adds manufacturing cost, and has impact to the welding property of steel plate and low temperature impact properties.And the yield strength of weather-resistant steel plate produced of this patent lower be 483 ~ 518MPa.
Summary of the invention
Object of the present invention will provide one to have stable zone of oxidation exactly and exempt from pre-treatment High Strength Container steel and manufacture method thereof.This steel has good overall corrosion resisting property, the particular requirement of encased conveying process can be met, there is again higher intensity simultaneously, container weight can be alleviated, and, without the sandblasting of non-environment-friendly type and ball blast pretreatment process, directly can carry out application and coating quality, coating performance had no adverse effect in Production Container process, its ferric oxide cortex is combined closely with coat system, has good consistency.The manufacturing approach craft flow process of this steel is simple, low production cost.
For achieving the above object, the stable zone of oxidation that has designed by the present invention exempts from pre-treatment High Strength Container steel, its chemical composition percentage is: C:0.01 ~ 0.03%, Si:0.05 ~ 0.25%, Mn:1.4 ~ 1.6%, S≤0.008%, P≤0.05%, Cu:0.25 ~ 0.40%, Cr:0.25 ~ 0.50%, Ni:0.22 ~ 0.30%, Nb:0.02 ~ 0.03%, and all the other are iron and inevitable impurity.
Further, its chemical composition percentage is preferably: C:0.020 ~ 0.028%, Si:0.10 ~ 0.20%, Mn:1.45 ~ 1.55%, S≤0.008%, P≤0.05%, Cu:0.30 ~ 0.35%, Cr:0.35 ~ 0.45%, Ni:0.25 ~ 0.30%, Nb:0.025 ~ 0.03%, all the other are iron and inevitable impurity.
The present invention has the manufacture method that stable zone of oxidation exempts from pre-treatment High Strength Container steel, undertaken by usual Clean Steel technique, comprise desulfurizing iron, converter smelting, the refining of LF stove, the refining of RH stove, heating of plate blank, hot continuous rolling, back segment cooling, the step of batching, its special character is:
Heating of plate blank furnace temperature controls at 1220 ~ 1280 DEG C, and the temperature out of roughing controls at 1020 ~ 1080 DEG C, and roughing rolling pass >=3 adopt full passage de-scaling, accumulative draught >=60%;
Finishing mill start rolling temperature controls at 920 ~ 980 DEG C, finishing temperature is at 800 ~ 850 DEG C, and roll speed is 7.0 ~ 12.0m/s, accumulative draught >=80%, such rolling condition can control the suitable thickness of final iron scale, and iron scale can not be come off in follow-up processing;
Go out finishing train steel plate relaxation 20 ~ 40S cooling time, speed of cooling is 10 ~ 40 DEG C/S, and control coiling temperature at 400 ~ 450 DEG C, batch rear insulation 6 ~ 10h, the temperature going out stay-warm case controls, at 300 ~ 350 DEG C, to be then cooled to room temperature.
Further, during described finish rolling, each frame adopts lubrication and rolling, and rack of finishing mill roll surface roughness Ra controls at 0.8 ~ 2.0 μm, is conducive to the adhesion property improving iron scale like this.
Again further, room temperature is cooled to 2 ~ 5 DEG C/min speed after going out stay-warm case.
The present invention is in order to ensure the premium properties of high-strength hot-rolled steel product, the design of alloy of steel meets the requirement of steel grade in solidity to corrosion and intensity under lower cost principle, the tissue morphology of carbon steel has a certain impact to corrosion resisting property, general carbon structure structure of steel is primarily of ferrite and cementite composition, the electropotential of this not homophase in chemical corrosion medium is different, ferrite current potential is lower, and the current potential of cementite is higher.In the electrolytic solution, the relative ferrite of cementite is negative electrode to steel, thus causes steel corrosion to accelerate.Therefore, control the precipitation of cementite in steel, obtain single uniform tissue, be conducive to the corrosion resisting property improving steel.The increase of carbon content can bring the raising of intensity, but weldability, low-temperature flexibility and weather resistance can be made to reduce.Low-carbon (LC) design that what the present invention taked is, makes to produce in the tissue of hot-rolled sheet and does not occur carbide or Fe 3c, the phase structure of microstructure is homogeneous phase constitution, avoids carbide or Fe 3c produces potential difference with steel matrix in steel, and galvanic corrosion occurs, and reduces the weather resistance of steel.Manganese is important highly malleablized element, can expand austenitic area, promotes the middle temperature structural transformation of steel, and obtaining acicular ferrite is main microtexture, and acicular ferrite structure is comparatively homogeneous, there is not carbide or Fe 3c, promotes the overall weather resistance of steel, and therefore also invention strictly controls the weight percentage of Mn.Cu can improve the corrosion resistance nature of steel, has certain strengthening effect, but can cause hot-short during Cu too high levels, produces check crack in heat-processed.Simultaneously in heat-processed, Cu can assemble at the matrix surface of steel, forms the phase of rich copper, can cause oxidation defect, therefore, strictly controls the weight percentage of Cu 0.25 ~ 0.40% in the present invention.Meanwhile, the present invention also coordinates the trace elements such as Nb by the weather-proof element such as Cr, Ni, reaches rational chemical composition design and promotes overall corrosion resistance energy, avoid the spot corrosion because inclusion causes, final design to go out the reasonable alloying constituent of steel grade.
Of the present invention have manufacture method that stable iron scale layer exempts from pre-treatment High Strength Container steel and considered the impact of alloying constituent on steel grade tissue and properties, and consider cost factor and product made from steel durability.By controlling various processing parameter during manufacture, being ultra-fine acicular ferrite by organizational controls, reducing cementite and forming as negative electrode the impact that corrosion accelerated by galvanic cell.Therefore, the while that the acicular ferrite structure obtained being conducive to the corrosion resisting property improving steel, by full de-scaling passage, drop into rolled lubricating oil, control finishing roll roughness, optimize the modes such as rolling temperature and obtain thinner iron scale thickness and excellent surface quality.Cooling stages after finish rolling, after relaxation after a while, be cooled to temperature required with fast speed, be acicular ferrite by organizational controls, reduce cementite and form as negative electrode the impact that corrosion accelerated by galvanic cell, during preparation, oiler temperature control is at 400 ~ 450 DEG C, batch rear coil of strip and be adjusted to warehouse of steel roll by overhead traveling crane, carry out being cooled to 300 ~ 350 DEG C with high-power fan, use stay-warm case to be incubated, soaking time 3 ~ 5h, then coil of strip is taken out from stay-warm case, go out after stay-warm case goes out stay-warm case and stack separately air cooling to room temperature.By above method controlled oxidization iron sheet structure, formed to be mainly FeO and Fe 3o 4scale structure.Control the eutectoid reaction making FeO in iron scale after batching, finally obtain thinner thickness, formed with fine and close FeO and Fe 3o 4for the stable ferric oxide cortex of primary structure.
Facts have proved, what manufacturing method according to the invention obtained have stable zone of oxidation exempts from pre-treatment High Strength Container steel, consider from the comprehensive action of steel Control and Inclusion Removal, chemical composition, tissue and iron scale Rotating fields, make mechanical property and overall corrosion resistance reach unification, steel surface is formed with fine and close FeO and Fe 3o 4be main scale structure, do not come off in roll-forming process, with vanish system, there is good consistency, do not affect coating properties, eliminate sandblasting and the ball blast pretreatment process of non-environment-friendly type, directly carry out application, simplify production process, reduce production cost.Scale on surface is fine and close, good with steel matrix bonding force, does not come off in the technological processs such as distortion, welding, and product made from steel extends work-ing life; Iron scale is with FeO and Fe 3o 4for primary structure, there is good protective effect to freight container transportation is anti-corrosion; And there is higher intensity, the case weight of freight container can be alleviated, save energy.
Embodiment
To of the present invention below in conjunction with specific embodiment there is stable zone of oxidation exempt from pre-treatment High Strength Container steel and manufacture method is described in further detail.
Table 1 lists in the embodiment of the present invention 1 ~ 5 has the chemical component weight percentage ratio (surplus is Fe and inevitable impurity) that stable zone of oxidation exempts from pre-treatment High Strength Container steel.
According to the requirement of each embodiment composition of steel, adopt converter steelmaking-LF-RH-continuous casting process to smelt when smelting, by desulfurizing iron, converter smelting, the refining of LF stove, the refining of RH stove, heating of plate blank, hot continuous rolling, cool, the step of batching smelts.Deep Desulphurization of Hot Metal pre-treatment is adopted when desulfurizing iron.Use calcium magnesium deoxidizer to carry out deoxidation during converter smelting, reduce the oxygen in molten steel and aluminium, and improve the form of inclusion, size and distribution.Adopt Calcium treatment when the refining of LF stove, control calcium line feed quantity and speed, control the form of inclusion further, its concrete manufacturing process is as follows:
The slab thickness of embodiment 1 is 230mm, controls calcium line wire-feeding velocity at 4.0m/s, and guarantee before controlling Calcium treatment that Ca/Al Ratio control is 0.11 when finished product thickness is the refining of 4mm, LF stove; In process furnace heating and temperature control at 1250 DEG C, the temperature out of roughing is at 1050 DEG C, and roughing rolling pass is 5 passages, and roughing 5 passage all adopts de-scaling; Accumulative draught is 70%, and finishing mill start rolling temperature controls at 980 DEG C, finishing temperature at 820 DEG C, roll speed 8.5m/s, accumulative draught is 80%, and each frame of finish rolling adopts lubrication and rolling, and rack of finishing mill roll surface roughness Ra controls at 1.8 μm; Go out finishing train steel plate relaxation 30S cooling time, it is 35 DEG C/S that speed of cooling controls, oiler temperature control is at 450 DEG C, batch rear coil of strip and be adjusted to warehouse of steel roll by overhead traveling crane, add fan and be quickly cooled to 350 DEG C, then carry out isothermal holding to coil of strip, soaking time is 3h, to go out after stay-warm case with 3 DEG C/min speed air cooling to room temperature.
The slab thickness of embodiment 2 is 230mm, controls calcium line wire-feeding velocity at 3.8m/s, and guarantee before controlling Calcium treatment that Ca/Al Ratio control is 0.12 when finished product thickness is the refining of 4mm, LF stove; In process furnace heating and temperature control at 1220 DEG C, the temperature out of roughing is at 1020 DEG C, and roughing rolling pass is 4 passages, and roughing 4 passage all adopts de-scaling, and accumulative draught is 75%; Finishing mill start rolling temperature controls at 950 DEG C, finishing temperature at 800 DEG C, roll speed 7.5m/s, accumulative draught is 85%, and each frame of finish rolling adopts lubrication and rolling, and rack of finishing mill roll surface roughness Ra controls at 1.5 μm; Go out finishing train steel plate relaxation 40S cooling time, speed of cooling is 25 DEG C/S, oiler temperature control is at 450 DEG C, batch rear coil of strip and be adjusted to warehouse of steel roll by overhead traveling crane, add fan and be quickly cooled to 300 DEG C, then carry out isothermal holding to coil of strip, soaking time is 10h, to go out after stay-warm case with 2 DEG C/min speed air cooling to room temperature.
The slab thickness of embodiment 3 is 230mm, controls calcium line wire-feeding velocity at 4.8m/s, and guarantee before controlling Calcium treatment that Ca/Al Ratio control is 0.10 when finished product thickness is the refining of 2.0mm, LF stove; In process furnace heating and temperature control at 1250 DEG C, the temperature out of roughing is at 1050 DEG C, and roughing rolling pass is 5 passages, and roughing 5 passage all adopts de-scaling, and accumulative draught is 80%; Finishing mill start rolling temperature controls at 980 DEG C, finishing temperature at 850 DEG C, roll speed 12m/s, accumulative draught is 80%, and each frame of finish rolling adopts lubrication and rolling, and rack of finishing mill roll surface roughness Ra controls at 1.8 μm; Go out finishing train steel plate relaxation 30S cooling time, speed of cooling is 25 DEG C/S; Oiler temperature control, at 450 DEG C, batches rear coil of strip and is adjusted to warehouse of steel roll by overhead traveling crane, and add fan and be quickly cooled to 350 DEG C, then carry out isothermal holding to coil of strip, soaking time is 6h, to go out after stay-warm case with 3 DEG C/min speed air cooling to room temperature.
The slab thickness of embodiment 4 is 230mm, controls calcium line wire-feeding velocity at 3.8m/s, and guarantee before controlling Calcium treatment that Ca/Al Ratio control is 0.12 when finished product thickness is the refining of 2.0mm, LF stove; In process furnace heating and temperature control at 1220 DEG C, the temperature out of roughing is at 1020 DEG C, and roughing rolling pass is 5 passages, and roughing 5 passage all adopts de-scaling, and accumulative draught is 65%; Finishing mill start rolling temperature controls at 950 DEG C, finishing temperature at 800 DEG C, roll speed 10.5m/s, accumulative draught is 90%, and each frame of finish rolling adopts lubrication and rolling, and rack of finishing mill roll surface roughness Ra controls at 0.8 μm; Go out finishing train steel plate relaxation 25S cooling time, speed of cooling is 28 DEG C/S, oiler temperature control is at 420 DEG C, batch rear coil of strip and be adjusted to warehouse of steel roll by overhead traveling crane, add fan and be quickly cooled to 320 DEG C, then carry out isothermal holding to coil of strip, soaking time is 7h, to go out after stay-warm case with 3 DEG C/min speed air cooling to room temperature.
The slab thickness of embodiment 5 is 230mm, controls calcium line wire-feeding velocity at 4.2m/s, and guarantee before controlling Calcium treatment that Ca/Al Ratio control is 0.11 when finished product thickness is the refining of 4mm, LF stove; In process furnace heating and temperature control at 1280 DEG C, the temperature out of roughing is at 1060 DEG C, and roughing rolling pass is 5 passages, and roughing 5 passage all adopts de-scaling, and accumulative draught is 70%; Finishing mill start rolling temperature controls at 950 DEG C, finishing temperature at 820 DEG C, roll speed 8.5m/s, accumulative draught is 90%, and each frame of finish rolling adopts lubrication and rolling, and rack of finishing mill roll surface roughness Ra controls at 2.0 μm; Go out finishing train steel plate relaxation 35S cooling time, speed of cooling is 30 DEG C/S, oiler temperature control is at 400 DEG C, batch rear coil of strip and be adjusted to warehouse of steel roll by overhead traveling crane, add fan and cool 320 DEG C fast, then carry out isothermal holding to coil of strip, soaking time is 9h, to go out after stay-warm case with 5 DEG C/min speed air cooling to room temperature.
The slab thickness of embodiment 6 is 230mm, controls calcium line wire-feeding velocity at 4.5m/s, and guarantee before controlling Calcium treatment that Ca/Al Ratio control is 0.12 when finished product thickness is the refining of 3mm, LF stove; In process furnace heating and temperature control at 1260 DEG C, the temperature out of roughing is at 1070 DEG C, and roughing rolling pass is 6 passages, and roughing 6 passage all adopts de-scaling, and accumulative draught is 70%; Finishing mill start rolling temperature controls at 920 DEG C, finishing temperature at 800 DEG C, roll speed 12.0m/s, accumulative draught is 90%, and each frame of finish rolling adopts lubrication and rolling, and rack of finishing mill roll surface roughness Ra controls at 2.0 μm; Go out finishing train steel plate relaxation 40S cooling time, speed of cooling is 33 DEG C/S, oiler temperature control is at 400 DEG C, batch rear coil of strip and be adjusted to warehouse of steel roll by overhead traveling crane, add fan and be quickly cooled to 300 DEG C, then carry out isothermal holding to coil of strip, soaking time is 5h, to go out after stay-warm case with 5 DEG C/min speed air cooling to room temperature.
Stable zone of oxidation that what above-mentioned six embodiments rolled out have exempts from the scale structure of pre-treatment High Strength Container steel, tissue and mechanical property contrast in table 2.
Table 2 scale structure, tissue and mechanical property contrast
After testing, above-mentioned six embodiment product made from steel scale structures are eutectoid Fe 3o 4the a small amount of FeO of+Fe+, as seen from the data in Table 2, it is fine and close and be combined closely with matrix that stable zone of oxidation that what manufacturing method according to the invention obtained have exempts from the scale on surface of pre-treatment High Strength Container steel, oxidated layer thickness is 8 ~ 10 μm and evenly, iron scale bed roughness Ra is 0.6 ~ 1.2 μm, its tensile strength>=700MPa, elongation>=18%, be organized as acicular ferrite, there is good overall corrosion resistance energy, iron scale is combined closely with steel matrix, do not come off in deformation process, there is good overall corrosion resistance energy and stable ferric oxide cortex, meet freight container coating specification.When using steel of the present invention, can pretreatment process be cancelled, not affect follow-up punching press or roll-forming, effective save energy and control environmental pollution.

Claims (4)

1. one kind has stable zone of oxidation and exempts from pre-treatment High Strength Container steel, its chemical composition percentage is: C:0.01 ~ 0.03%, Si:0.05 ~ 0.25%, Mn:1.4 ~ 1.6%, S≤0.008%, P≤0.05%, Cu:0.25 ~ 0.40%, Cr:0.25 ~ 0.50%, Ni:0.22 ~ 0.30%, Nb:0.02 ~ 0.03%, and all the other are iron and inevitable impurity; Its manufacture method, comprises desulfurizing iron, converter smelting, the refining of LF stove, the refining of RH stove, heating of plate blank, hot continuous rolling, the step that cools, batch, wherein:
Heating of plate blank furnace temperature controls at 1220 ~ 1280 DEG C, and the temperature out of roughing controls at 1020 ~ 1080 DEG C, and roughing rolling pass >=3 adopt full passage de-scaling, accumulative draught >=60%; Finishing mill start rolling temperature controls at 920 ~ 980 DEG C, and finishing temperature is at 800 ~ 850 DEG C, and roll speed is 7.0 ~ 12.0m/s, accumulative draught >=80%; Go out finishing train steel plate relaxation 20 ~ 40S cooling time, speed of cooling is 10 ~ 40 DEG C/S, and control coiling temperature at 400 ~ 450 DEG C, batch rear insulation 6 ~ 10h, the temperature going out stay-warm case controls, at 300 ~ 350 DEG C, to be then cooled to room temperature.
2. according to claim 1 have stable zone of oxidation and exempt from pre-treatment High Strength Container steel, it is characterized in that: the chemical composition percentage of this steel is preferably: C:0.020 ~ 0.028%, Si:0.10 ~ 0.20%, Mn:1.45 ~ 1.55%, S≤0.008%, P≤0.05%, Cu:0.30 ~ 0.35%, Cr:0.35 ~ 0.45%, Ni:0.25 ~ 0.30%, Nb:0.025 ~ 0.03%, all the other are iron and inevitable impurity.
3. according to claim 1 have stable zone of oxidation and exempt from pre-treatment High Strength Container steel, it is characterized in that: during described finish rolling, and each frame adopts lubrication and rolling, and rack of finishing mill roll surface roughness Ra controls at 0.8 ~ 2.0 μm.
4. according to claim 1 have stable zone of oxidation and exempt from pre-treatment High Strength Container steel, it is characterized in that: be cooled to room temperature with 2 ~ 5 DEG C/min speed after going out stay-warm case.
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