CN104593698A - Method for manufacturing high-strength cold-rolled weather resisting steel plates and high-strength cold-rolled weather resisting steel plates - Google Patents
Method for manufacturing high-strength cold-rolled weather resisting steel plates and high-strength cold-rolled weather resisting steel plates Download PDFInfo
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Abstract
The invention relates to the technical field of cold-rolled weather resistant steel and provides a method for manufacturing high-strength cold-rolled weather resisting steel plates and the high-strength cold-rolled weather resisting steel plates. The technical problem that large-scale stable production of the high-strength cold-rolled weather resisting steel plates is difficultly realized by the conventional continuous annealing production line equipment in the prior art is solved. The method comprises the following steps: heating a continuous casting sheet billet, performing roughing scale removal, fixing the width of a press, performing rough rolling, performing flying shear, performing refined scale removal, performing finish rolling, performing laminar cooling, coiling, pickling, performing cold rolling, performing continuous annealing and flattening, and controlling the following process parameters: (1) the plate tapping temperature is 1260-1290 DEG C; (2) the final rolling temperature of finish rolling is 875-895 DEG C; (3) the coiling temperature is 610-630 DEG C; and (4) the continuous annealing temperature is 800-820 DEG C, and the rapid cooling rate is 30-45 DEG C per second. The technical effect that large-scale stable production of the high-strength cold-rolled weather resisting steel plates can be realized by adopting the conventional continuous annealing equipment is achieved.
Description
Technical field
The present invention relates to the technical field of cold rolling weather resisting steel, disclose a kind of manufacture method and high-strength cold rolling weather-resistant steel plate of high-strength cold rolling weather-resistant steel plate.
Background technology
Along with the fast development of China's container industry and automobile industry, special container panel and repacking vehicle body bottom with steel progressively to " Thin Specs, high strength and high-weatherability " future development, but because of traditional hot continuous rolling production line, by the restriction of ultra-thin gauge rolling ability and Strip Shape Control level, thickness specification 1.4mm and following cannot be stably produced, yield strength >=800MPa and tensile strength >=1100MPa, and the high-strength weathering steel plate with favorable forming property.For this reason, adopt cold rolling and annealing produce line produce become inexorable trend.
Bell-type annealing explained hereafter and continuous annealing process production is comprised in prior art, wherein, bell-type annealing explained hereafter to annealing temperature and the time very sensitive, coil of strip cold and hot some temperature difference is large, is difficult to ensure the consistence of logical volume mechanical property and realizes stable mass production.Continuous annealing process is produced then exists the problems such as cost of alloy is high, annealing temperature is high, rate of cooling is high, the conventional batch stably manufactured of even moving back product line capacity of equipment and being difficult to realize high-strength cold rolling weather-resistant steel plate.
Summary of the invention
The embodiment of the present invention provides a kind of manufacture method and high-strength cold rolling weather-resistant steel plate of high-strength cold rolling weather-resistant steel plate, can not realize the technical problem of the batch stably manufactured of economical cold rolling high-strength weathering steel to solve the conventional even equipment of moving back in prior art.
First aspect, the embodiment of the present invention provides a kind of manufacture method of high-strength cold rolling weather-resistant steel plate, comprise following technical process: continuous casting steel billet heating → thick de-scaling → fixed-width pressure machine → roughing → flying shear → smart de-scaling → finish rolling → section cooling → batch → pickling → cold rolling → continuous annealing → smooth, controls following processing parameter:
(1) in described continuous casting steel billet heating process, slab tapping temperature is 1260 DEG C ~ 1290 DEG C;
(2) in described finish-rolling process, finish rolling finishing temperature is 875 DEG C ~ 895 DEG C;
(3) in described coiling technique, coiling temperature is 610 DEG C ~ 630 DEG C;
(4) in described continuous annealing process, continuous annealing temperature 800 DEG C ~ 820 DEG C, quick rate of cooling 30 ~ 45 DEG C/s.
Optionally, the chemical composition (wt%) of described high-strength cold rolling weather-resistant steel plate is: carbon: 0.165% ~ 0.185%; Silicon: 0.06% ~ 0.14%; Manganese: 1.63% ~ 1.73%; Phosphorus: < 0.020%; Sulphur: < 0.002%; Chromium: 0.45% ~ 0.55%; Nickel: 0.08% ~ 0.18%; Copper: 0.255% ~ 0.295%; Niobium: 0.025% ~ 0.035%; Titanium: 0.018% ~ 0.028%; Boron: 0.0015%-0.0025%, all the other are iron and inevitable impurity.
Optionally, the yield strength Rel >=800MPa of described high-strength cold rolling weather-resistant steel plate, tensile strength Rm >=1100MPa, unit elongation El >=7%; And horizontal d=a clod wash during described high-strength cold rolling weather-resistant steel plate 180 ° is qualified.
Second aspect, the embodiment of the present invention provides a kind of high-strength cold rolling weather-resistant steel plate, and the manufacture method manufacture of the high-strength cold rolling weather-resistant steel plate that described high-strength cold rolling weather-resistant steel plate is introduced by any embodiment of the present invention forms.
Optionally, the chemical composition (wt%) of described high-strength cold rolling weather-resistant steel plate is: carbon: 0.165% ~ 0.185%; Silicon: 0.06% ~ 0.14%; Manganese: 1.63% ~ 1.73%; Phosphorus: < 0.020%; Sulphur: < 0.002%; Chromium: 0.45% ~ 0.55%; Nickel: 0.08% ~ 0.18%; Copper: 0.255% ~ 0.295%; Niobium: 0.025% ~ 0.035%; Titanium: 0.018% ~ 0.028%; Boron: 0.0015%-0.0025%, all the other are iron and inevitable impurity.
Optionally, the yield strength Rel >=800MPa of described high-strength cold rolling weather-resistant steel plate, tensile strength Rm >=1100MPa, unit elongation El >=7%; And horizontal d=a clod wash during described high-strength cold rolling weather-resistant steel plate 180 ° is qualified.
Beneficial effect of the present invention is as follows:
Due in embodiments of the present invention, in the manufacturing processed of high-strength cold rolling weather-resistant steel plate, have employed by heating furnace high-temperature heating, high-temperature final rolling and high temperature coiling technique, wherein, Heating temperature 1260 DEG C ~ 1290 DEG C, finish rolling finishing temperature 875 DEG C ~ 895 DEG C, coiling temperature 610 DEG C ~ 630 DEG C, continuous annealing temperature 800 DEG C ~ 820 DEG C, quick rate of cooling 30 ~ 45 DEG C/s.Course of hot rolling adopts high-temperature technology, and rolling load is little, less demanding to equipment of hot rolling, ensure that the stability of hot rolling process; Temperature heating and middling speed cooling during cold-rolled process adopts, employing is conventional connects the batch stably manufactured that the equipment of moving back can realize high-strength cold rolling weather-resistant steel plate.
Accompanying drawing explanation
Fig. 1 is the schema of the manufacture method of high-strength cold rolling weather-resistant steel plate in the embodiment of the present invention.
Embodiment
The embodiment of the present invention provides a kind of manufacture method and high-strength cold rolling weather-resistant steel plate of high-strength cold rolling weather-resistant steel plate, can not realize the technical problem of the batch stably manufactured of economical cold rolling high-strength weathering steel to solve the conventional even equipment of moving back in prior art.
Technical scheme in the embodiment of the present application is solve above-mentioned technical problem, and general thought is as follows:
In the manufacturing processed of high-strength cold rolling weather-resistant steel plate, have employed by heating furnace high-temperature heating, high-temperature final rolling and high temperature coiling technique, wherein, Heating temperature 1260 DEG C ~ 1290 DEG C, finish rolling finishing temperature 875 DEG C ~ 895 DEG C, coiling temperature 610 DEG C ~ 630 DEG C, continuous annealing temperature 800 DEG C ~ 820 DEG C, quick rate of cooling 30 ~ 45 DEG C/s.Course of hot rolling adopts high-temperature technology, and rolling load is little, less demanding to equipment of hot rolling, ensure that the stability of hot rolling process; Temperature heating and middling speed cooling during cold-rolled process adopts, employing is conventional connects the batch stably manufactured that the equipment of moving back can realize high-strength cold rolling weather-resistant steel plate.
In order to better understand technique scheme, below by accompanying drawing and specific embodiment, technical solution of the present invention is described in detail, the specific features being to be understood that in the embodiment of the present invention and embodiment is the detailed description to technical solution of the present invention, instead of the restriction to technical solution of the present invention, when not conflicting, the technical characteristic in the embodiment of the present invention and embodiment can combine mutually.
First aspect, the embodiment of the present invention provides a kind of manufacture method of high-strength cold rolling weather-resistant steel plate, please refer to Fig. 1, comprising:
Step S101: continuous casting steel billet heating process, is specially: slab is loaded process furnace and heats, slab tapping temperature is 1260 DEG C ~ 1290 DEG C;
Step S102: thick descaling process;
Wherein, the technological process of slab scale on surface is removed in de-scaling before referring to rolling.Produce defect in order to avoid the iron scale press-in metal in cogged ingot or continuous casting steel rolling base surface, before slab rough rolling, must de-scaling be carried out.The removing of iron scale must be carried out when iron sheet is not yet pressed into surface before the rolling.Slab, before entering roughing mills, first gives certain side direction draught, the iron scale on broken slab surface by means of the large edger roll before being arranged in roughing mills, then with the high pressure water removing iron scale before and after high-pressure water descaling case and roughing mill.The pressure of high pressure water is 120MPa to straight carbon steel, and alloy steel then needs 170MPa, even have up to 200MPa.
Step S103: carry out fixed width process by fixed-width pressure machine;
Wherein, the effect of fixed-width pressure machine is the width changing steel band, and this mainly because slab caster changes the width more complicated of slab, and can meet the needs of hot strip steel description different in width by the fixed width operation of fixed-width pressure machine.
Step S104: roughing technique;
Step S105: flying shear technique;
Wherein, flying shear be arranged on rolling operation line is used for lateral shear band steel head, tail or cut into specified length, in workpiece motion s process, by cutting edge relative movement, rolled piece is cut off.
Step S106: smart descaling process;
Step S107: finish-rolling process, wherein, finish rolling finishing temperature is 875 DEG C ~ 895 DEG C;
Step S108: laminar flow cooling technology;
Wherein, the central role of section cooling is by controlling laminar flow cooling spray penstock open mode, opened condition or flow, will be cooled to predetermined batch target temperature with steel from a certain finishing temperature (875 DEG C namely ~ 895 DEG C);
Step S109: coiling technique, wherein, coiling temperature is 610 DEG C ~ 630 DEG C, and the object of batching is band coil of strip to become tubular;
Step S110: acid cleaning process;
Wherein, the object of pickling is to utilize the oxide skin on acid solution removal steel surface and corrosion thing.
Step S111: cold-rolling process;
Wherein, it is cold rolling that to refer to coils of hot-rolled steel be raw material, cold continuous rolling is carried out after pickling scale removal, its finished product is for rolling hard volume, because continuous cold is out of shape, the cold hardening caused makes to roll the intensity of hard volume, hardness rises, tough index of moulding declines, therefore punching performance will worsen, and can only be used for the part of simple deformation.
Step S112: continuous annealing process, in continuous annealing process, continuous annealing temperature 800 DEG C ~ 820 DEG C, quick rate of cooling 30 ~ 45 DEG C/s;
Wherein, annealing is a kind of metal heating processing technology, refers to and metal is slowly heated to certain temperature, keeps enough time, then cools with Reasonable Speed.Object reduces hardness, improves machinability; Eliminate unrelieved stress, stable dimensions, reduce distortion and be inclined to crackle; Crystal grain thinning, adjustment tissue, eliminates tissue defects.
And continuous annealing continues through annealing furnace for being with steel, annealing furnace is without sealing, and band steel directly carries out the mode of production of batching without stop.In production application, continuous annealing is widely used, and continuous annealing makes deformed grains again change even equi-axed crystal into, eliminates work hardening and residual internal stress simultaneously, and the structure and properties of steel returns to the thermal treatment process of state before cold deformation.
When the temperature of anneal is 800 DEG C ~ 820 DEG C, the middling speed cooling that the manufacturing processed of high-strength cold rolling weather-resistant steel plate is adopted, can ensure cold rolling after strip shape quality and mechanical property, and expansion connects the Technological adaptability moving back and produce line and produce.
Be: 30 ~ 45 DEG C/s that in adopting the manufacturing processed of high-strength cold rolling weather-resistant steel plate, Wen Lian moves back in the rate of cooling of anneal, can ensure equally cold rolling after strip shape quality and mechanical property, and expansion connects the Technological adaptability moving back and produce line and produce.
That is by such scheme, the technique effect ensureing strip shape quality in high-strength cold rolling weather-resistant steel plate production process and mechanical property can be reached.
Meanwhile, in employing, Wen Lian moves back the continuous annealing process with middling speed cooling, without the need to heat ability and high hydrogen rapid cooling or shrend function, has stronger apparatus adaptability, and the needs that unit can meet batch stably manufactured move back in common company.
Step S113: flattening process, just can obtain high-strength cold rolling weather-resistant steel plate through flattening process.
Wherein, the band steel after recrystallization annealing often needs smooth, makes band steel obtain necessary performance and surface quality, the requirement of operation processing after meeting.So carry out smooth process, smooth essence is a kind of rolling deformation of light reduction.
Wherein, above step S101 ~ step S109 is course of hot rolling, and above step S110 ~ step S113 is cold-rolled process.
As further preferred embodiment, the chemical composition (wt%) of high-strength cold rolling weather-resistant steel plate is: carbon: 0.165% ~ 0.185%; Silicon: 0.06% ~ 0.14%; Manganese: 1.63% ~ 1.73%; Phosphorus: < 0.020%; Sulphur: < 0.002%; Chromium: 0.45% ~ 0.55%; Nickel: 0.08% ~ 0.18%; Copper: 0.255% ~ 0.295%; Niobium: 0.025% ~ 0.035%; Titanium: 0.018% ~ 0.028%; Boron: 0.0015%-0.0025%, all the other are iron and inevitable impurity.
The alloying element that the high-strength cold rolling weather-resistant steel plate that the embodiment of the present invention is introduced adds is become to be grouped into based on following principle by above:
C element improves one of most economical effective element of mechanical property, and the C element be solid-solution in steel both can improve the intensity of steel, was also conducive to being combined with Nb, Ti element forming niobium carbide titanium, plays the effect of thin crystalline substance and precipitation strength.In the present invention, C element content is set in 0.165% ~ 0.185%, avoids its welding property of the too high deterioration of carbon content on the one hand, can avoid peritectoid district on the other hand, improve Nb bearing steel Surface Quality of Steel Billet.
Si element improves steel strength by solution strengthening, but silicone content is higher can increase iron sheet viscosity, and increase pickling and remove difficulty, be the surface quality improving cold-rolled steel sheet, in the present invention, silicone content is set as 0.06% ~ 0.14%.
Mn element significantly can improve the toughness and tenacity of steel, but the too high center segregation that can worsen steel, in the present invention, the design of Mn content is moderate, is 1.63% ~ 1.73%.
P element easily causes the center segregation of steel, and worsen welding property and the low-temperature flexibility of steel, in the present invention, P content is set as < 0.020%.
S element easily forms MnS with Mn element and is mingled with, and forms pitting attack source in steel, and the weather resistance of deterioration steel, in the present invention, S content is set as < 0.002%.
Cu element can significantly improve the weather resistance of steel when being greater than 0.25%, continue to increase weathering resistance change not obvious, but cost significantly will promote and can increase " copper brittleness " risk, in the present invention, Cu content is designed to 0.255% ~ 0.295%.
Cr element can significantly improve intensity and the weather resistance of steel, but the too high plasticity and toughness that can reduce steel, consider Cr content and be designed to 0.45% ~ 0.55%.
When Ni constituent content is lower, very little to weather resistance contribution, but when being controlled more than 1/3 by Ni/Cu, obviously can suppress the generation of " copper brittleness " defect, therefore, in the present invention, Ni content is designed to 0.08% ~ 0.18%.
Nb element is typical micro alloying element, by forming tiny niobium carbide precipitate, and improves austenite recrystallization temperature, expands Unhydrated cement rolling, plays its refined crystalline strengthening and precipitation strength effect.When its content is on the low side, its thin brilliant and precipitation DeGrain; When content is higher, significantly can increase hot rolling deformation drag and rolling difficulty.For this reason, in the present invention, Nb content is designed to 0.025% ~ 0.035%.
Ti is strong carbonitride-forming elements, a small amount of interpolation can play the effect suppressing AUSTENITE GRAIN COARSENING in slab heat-processed, not only significantly hot-rolling draught pressure is increased when add-on is excessive, and in the continuous annealing process of cold rolling rear comparatively high temps, occur again that precipitate is significantly grown up, and cannot play precipitating reinforcing effect.For this reason, in the present invention, Ti constituent content is designed to 0.018% ~ 0.028%.
B is the most economical effective element improving hardenability of steel, and appropriate interpolation can obtain low-temperature transformation tissue under not high cooling rate, and in the present invention, B content is designed to 0.0015%-0.0025%.
Further, due in such scheme, high-strength cold rolling weather-resistant steel plate adopts high C, micro-Nb, micro-Ti and the Composition Design containing B, gives full play to the useful strengthening effect of cheap carbon and boron, significantly reduces cost of alloy.
As further preferred embodiment, the yield strength Rel >=800MPa of high-strength cold rolling weather-resistant steel plate, tensile strength Rm >=1100MPa, unit elongation El >=7%; And horizontal d=a clod wash during high-strength cold rolling weather-resistant steel plate 180 ° is qualified.
High-strength cold rolling weather-resistant steel plate manufactured by the making method introducing two groups of experimental datas (being respectively embodiment 1 and embodiment 2) and verify the high-strength cold rolling weather-resistant steel plate introduced according to the embodiment of the present invention is met above requirement below.
The chemical composition (Wt.%) of two groups of experimental datas is as shown in table 1:
Table 1
Hot-rolled process parameter is as shown in table 2:
Table 2
Continuous annealing process parameter is as shown in table 3:
Table 3
Mechanical property is as shown in table 4:
Table 4
Wherein, b represents the width of sampling steel bar, and d represents that a represents the thickness of sampling steel bar by sampling steel plate bending to steel bar Bend diameter of sampling when 180 °.
Wherein, embodiment 1 yield strength is 923MPa, is greater than 800MPa, meets the requirements; Tensile strength Rm is 1156MPa, meets the requirements; Unit elongation El is 9.5, is greater than 7%, meets the requirements; And during 180 ° of clod washes, d=a, so transverse cold bending during high-strength cold rolling weather-resistant steel plate 180 ° is qualified; And in embodiment 2, yield strength is 878MPa, be greater than 800MPa, meet the requirements; Tensile strength Rm is 1129MPa, meets the requirements; Unit elongation El is 11.0, is greater than 7%, meets the requirements; And during 180 ° of clod washes, d=a, so transverse cold bending during high-strength cold rolling weather-resistant steel plate 180 ° is qualified.
As can be seen here, the high-strength cold rolling weather-resistant steel plate manufactured by making method of high-strength cold rolling weather-resistant steel plate that the embodiment of the present invention is introduced has good mechanical property.
On the other hand, the embodiment of the present invention provides a kind of high-strength cold rolling weather-resistant steel plate, it is characterized in that, the manufacture method manufacture of the high-strength cold rolling weather-resistant steel plate that high-strength cold rolling weather-resistant steel plate is introduced by any embodiment of the present invention forms.
As further preferred embodiment, the chemical composition (wt%) of high-strength cold rolling weather-resistant steel plate is: carbon: 0.165% ~ 0.185%; Silicon: 0.06% ~ 0.14%; Manganese: 1.63% ~ 1.73%; Phosphorus: < 0.020%; Sulphur: < 0.002%; Chromium: 0.45% ~ 0.55%; Nickel: 0.08% ~ 0.18%; Copper: 0.255% ~ 0.295%; Niobium: 0.025% ~ 0.035%; Titanium: 0.018% ~ 0.028%; Boron: 0.0015%-0.0025%, all the other are iron and inevitable impurity.
As further preferred embodiment, the yield strength Rel >=800MPa of high-strength cold rolling weather-resistant steel plate, tensile strength Rm >=1100MPa, unit elongation El >=7%; And horizontal d=a clod wash during high-strength cold rolling weather-resistant steel plate 180 ° is qualified.
The one or more embodiment of the present invention, at least has following beneficial effect:
Due in embodiments of the present invention, in the manufacturing processed of high-strength cold rolling weather-resistant steel plate, have employed by heating furnace high-temperature heating, high-temperature final rolling and high temperature coiling technique, wherein, Heating temperature 1260 DEG C ~ 1290 DEG C, finish rolling finishing temperature 875 DEG C ~ 895 DEG C, coiling temperature 610 DEG C ~ 630 DEG C, continuous annealing temperature 800 DEG C ~ 820 DEG C, quick rate of cooling 30 ~ 45 DEG C/s.Course of hot rolling adopts high-temperature technology, and rolling load is little, less demanding to equipment of hot rolling, ensure that the stability of hot rolling process; Temperature heating and middling speed cooling during cold-rolled process adopts, employing is conventional connects the batch stably manufactured that the equipment of moving back can realize high-strength cold rolling weather-resistant steel plate.
Although describe the preferred embodiments of the present invention, those skilled in the art once obtain the basic creative concept of cicada, then can make other change and amendment to these embodiments.So claims are intended to be interpreted as comprising preferred embodiment and falling into all changes and the amendment of the scope of the invention.
Obviously, those skilled in the art can carry out various change and modification to the embodiment of the present invention and not depart from the spirit and scope of the embodiment of the present invention.Like this, if these amendments of the embodiment of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (6)
1. the manufacture method of a high-strength cold rolling weather-resistant steel plate, comprise following technical process: continuous casting steel billet heating → thick de-scaling → fixed-width pressure machine → roughing → flying shear → smart de-scaling → finish rolling → section cooling → batch → pickling → cold rolling → continuous annealing → smooth, it is characterized in that, following processing parameter is controlled:
(1) in described continuous casting steel billet heating process, slab tapping temperature is 1260 DEG C ~ 1290 DEG C;
(2) in described finish-rolling process, finish rolling finishing temperature is 875 DEG C ~ 895 DEG C;
(3) in described coiling technique, coiling temperature is 610 DEG C ~ 630 DEG C;
(4) in described continuous annealing process, continuous annealing temperature 800 DEG C ~ 820 DEG C, quick rate of cooling 30 ~ 45 DEG C/s.
2. the method for claim 1, is characterized in that, the chemical composition (wt%) of described high-strength cold rolling weather-resistant steel plate is: carbon: 0.165% ~ 0.185%; Silicon: 0.06% ~ 0.14%; Manganese: 1.63% ~ 1.73%; Phosphorus: < 0.020%; Sulphur: < 0.002%; Chromium: 0.45% ~ 0.55%; Nickel: 0.08% ~ 0.18%; Copper: 0.255% ~ 0.295%; Niobium: 0.025% ~ 0.035%; Titanium: 0.018% ~ 0.028%; Boron: 0.0015%-0.0025%, all the other are iron and inevitable impurity.
3. the method for claim 1, is characterized in that, the yield strength Rel >=800MPa of described high-strength cold rolling weather-resistant steel plate, tensile strength Rm >=1100MPa, unit elongation El >=7%; And horizontal d=a clod wash during described high-strength cold rolling weather-resistant steel plate 180 ° is qualified.
4. a high-strength cold rolling weather-resistant steel plate, is characterized in that, described high-strength cold rolling weather-resistant steel plate is formed by the arbitrary described method manufacture of claim 1-3.
5. high-strength cold rolling weather-resistant steel plate as claimed in claim 4, it is characterized in that, the chemical composition (wt%) of described high-strength cold rolling weather-resistant steel plate is: carbon: 0.165% ~ 0.185%; Silicon: 0.06% ~ 0.14%; Manganese: 1.63% ~ 1.73%; Phosphorus: < 0.020%; Sulphur: < 0.002%; Chromium: 0.45% ~ 0.55%; Nickel: 0.08% ~ 0.18%; Copper: 0.255% ~ 0.295%; Niobium: 0.025% ~ 0.035%; Titanium: 0.018% ~ 0.028%; Boron: 0.0015%-0.0025%, all the other are iron and inevitable impurity.
6. high-strength cold rolling weather-resistant steel plate as claimed in claim 4, is characterized in that, the yield strength Rel >=800MPa of described high-strength cold rolling weather-resistant steel plate, tensile strength Rm >=1100MPa, unit elongation El >=7%; And horizontal d=a clod wash during described high-strength cold rolling weather-resistant steel plate 180 ° is qualified.
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| CN114381580A (en) * | 2020-10-19 | 2022-04-22 | 宝山钢铁股份有限公司 | Cover type annealing process and manufacturing method of high-corrosion-resistance weathering steel |
| CN114381580B (en) * | 2020-10-19 | 2023-12-12 | 宝山钢铁股份有限公司 | Cover annealing process and manufacturing method of high corrosion-resistant weather-resistant steel |
| CN117181810A (en) * | 2023-09-26 | 2023-12-08 | 江苏甬金金属科技有限公司 | Preparation method of ultrathin cold-rolled weather-resistant steel strip |
| CN117181810B (en) * | 2023-09-26 | 2024-04-19 | 江苏甬金金属科技有限公司 | Preparation method of ultrathin cold-rolled weather-resistant steel strip |
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