CN104946969A - Hot-rolled pickled steel plate for air conditioner compressor housings and manufacturing method thereof - Google Patents

Hot-rolled pickled steel plate for air conditioner compressor housings and manufacturing method thereof Download PDF

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Publication number
CN104946969A
CN104946969A CN201410125386.9A CN201410125386A CN104946969A CN 104946969 A CN104946969 A CN 104946969A CN 201410125386 A CN201410125386 A CN 201410125386A CN 104946969 A CN104946969 A CN 104946969A
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steel plate
hot
air conditioner
conditioner compressor
hot rolling
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CN104946969B (en
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王进
裴新华
韩乃川
刘友荣
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Shanghai Meishan Iron and Steel Co Ltd
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Shanghai Meishan Iron and Steel Co Ltd
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Abstract

The invention relates to a hot-rolled pickled steel plate for air conditioner compressor housings and a manufacturing method thereof. The invention solves the technical problems of high strength and poor stamping forming performance in the existing hot-rolled pickled plate for air conditioner compressor housings. The hot-rolled pickled steel plate for air conditioner compressor housings comprises the following chemical components in percentage by weight: 0.015%-0.040% of C, 0.005%-0.035% of Si, 0.15%-0.35% of Mn, at most 0.018% of P, at most 0.015% of S, at most 0.0050% of N, 0.020%-0.055% of Al, and the balance of iron and inevitable inclusions. The hot-rolled pickled steel plate is used for manufacturing a main housing, an end cover, a liquid storage tank and other parts of the air conditioner compressor housing.

Description

A kind of air conditioner compressor housing hot rolling acid-cleaning steel plate and manufacture method thereof
  
Technical field
The present invention relates to a kind of hot rolling acid-cleaning plate, particularly a kind of air conditioner compressor housing hot rolling acid-cleaning steel plate and manufacture method thereof.
Background technology
Hot rolling acid-cleaning plate is with high-quality latten for raw material, and remove surface oxide layer through straightening, pickling, after trimming, oiling, product surface quality, mechanical property, plate shape etc. are better than the product of hot-rolled sheet.The advantage of hot rolling acid-cleaning plate is mainly: 1) surface quality is good, because hot rolling acid-cleaning plate eliminates scale on surface, improves the surface quality of steel, is convenient to welding, oiling and japanning.2) dimensional precision is high, after smooth, template can be made to change a lot, thus reduces the deviation of roughness.3) improve surface smoothness, enhance appearance effect.4) environmental pollution that user disperses pickling to cause can be reduced.5) can Some substitute cold-reduced sheet, reduce enterprise's production cost.Along with the constantly progress of steel rolling process technology, the performance forward cold-reduced sheet of latten is close, and " with hot Dai Leng " is achieved technically.Hot rolling acid-cleaning plate is more and more for industries such as light industry, household electrical appliances, automobile, machineries.
Air conditioner compressor housing mainly comprises the parts such as end cap, container for storing liquid, main housing, makes in the past produce of cold-reduced sheet.Compressor of air conditioner end cap and container for storing liquid adopt punching stretch technological forming, require that steel plate has good stamping formabilily, and main housing be by roller circle shaping after, cylindrical member is welded into by automatic plasma weldprocedure, shaping and Plasma Welding technique is justified in order to roller can be adapted to, need the shaping rear butt-joint clearance of roller circle to be of moderate size, fluctuate little, require that steel plate has moderate, stable intensity, hardness and thickness evenness.The hot rolling acid-cleaning plate that prior art is produced there is the problems such as intensity is improper, forming property is bad for the production of compressor of air conditioner main housing and the problems such as waist folding defect appear in shaping rear surface.As Chinese Patent Application No. a kind of hot-rolled pickled sheet with low yield ratio and production method thereof disclosed in the patent of 201110449207.3, with the addition of C and the Mn element of high level in its composition range, content is respectively 0.04-0.12% and 0.8-1.5%; And with the addition of B element.By this patent performance test, the intensity of steel plate is higher, and yield strength average reaches 344.5MPa, if carry out main housing roller circle when being shaped, intermediate gap can be comparatively large, rack of fusion when causing follow-up Plasma Welding.With the addition of B element in addition and be also unfavorable for welding.Chinese Patent Application No. is a kind of Thin Specs hot rolling acid-cleaning steel and production method thereof with good plasticity disclosed in the patent of 201210298855.8, also C, SI, Mn element of high level is with the addition of in its composition range, content is respectively 0.04-0.07%, 0.1-0.3% and 0.41-0.60%, also there is intensity higher, formability is bad, also add higher SI content simultaneously, unfavorable to acid-cleaning plate surface quality, be therefore also not suitable for making air conditioner compressor housing.
There is the problems such as intensity is improper, forming property is bad for the production of compressor of air conditioner main housing in the hot rolling acid-cleaning plate that prior art is produced, thus causes steel plate forming excessive clearance or too small, and gap is uneven, rack of fusion; Steel Sheet is bad causes the defect such as stamping cracking, ear processed; Because steel plate stretching curve exists yield point elongation, cause surface of steel plate can there is waist folding defect.
  
Summary of the invention
In order to overcome the deficiencies in the prior art, need to provide a kind of air conditioner compressor housing hot rolling acid-cleaning steel plate and manufacture method thereof, the present invention is by adopting suitable Composition Design, hot rolling and acid cleaning process, the steel plate obtained has suitable intensity and good forming property, and eliminate the yield point elongation that hot-rolled steel sheet self exists, and obtain good plate shape, can be used in making the air conditioner compressor housing comprising the parts such as main housing, end cap, container for storing liquid.
The object of this invention is to provide a kind of air conditioner compressor housing hot rolling acid-cleaning steel plate and manufacture method thereof, solve the technical problem that existing air conditioner compressor housing hot rolling acid-cleaning plate intensity is high, stamping formabilily is poor.
The technical solution used in the present invention is:
A kind of air conditioner compressor housing hot rolling acid-cleaning steel plate, its chemical component weight per-cent is: C:0.015% ~ 0.040%, Si:0.005% ~ 0.035%, Mn:0.15% ~ 0.35%, P≤0.018%, S≤0.015%, N≤0.0050%, Al:0.020% ~ 0.055%, surplus is iron and is unavoidably mingled with.
The reason that the chemical composition of a kind of air conditioner compressor housing of the present invention hot rolling acid-cleaning steel plate is limited in above-mentioned scope is as follows:
Carbon: the too high meeting of carbon content causes intensity too high, can form the carbide particle of more thick fragility in steel, to plasticity and toughness unfavorable, forming property can be caused sharply to worsen simultaneously.Simultaneously too high carbon content increases welding carbon equivalent, is unfavorable for welding processing.Carbon content scope of the present invention also needs strict restriction, because armor plate strength is responsive to carbon content, carbon content is low, armor plate strength reduces, if it is large that carbon content a wider range can cause armor plate strength to fluctuate, like this when compressor main housing roller circle is shaped, the large minor swing of intermediate gap, causes follow-up Plasma Welding bad.The carbon content of the present invention's setting is 0.015% ~ 0.040%.
Silicon: silicon is solid-solubilized in steel matrix certain strengthening effect, the silicon containing appropriate in steel during melting is simultaneously favourable to deoxidation, desulfurization.But the present invention must control silicone content, when silicone content is higher, serious Fe can be formed on hot-rolled sheet surface 2o 3, in follow-up acid cleaning process, be difficult to pickling eliminate, even if pickling also can form aberration and spot at surface of steel plate after eliminating, have a strong impact on compressor housing outward appearance and follow-up japanning process.It is 0.005% ~ 0.035% that the present invention limits Si content.
Manganese: be conducive to desulfurization containing appropriate manganese in hot rolling acid-cleaning plate, can also have certain strengthening effect simultaneously.But Mn content is high, the cost of the corresponding increase steel of meeting, also can increase carbon equivalent, is unfavorable for welding.Also for ease of the fluctuation reducing intensity, also need to limit Fe content scope.The Mn of restriction content range of the present invention is 0.15% ~ 0.35%.
Sulphur and phosphorus: sulphur forms sulfide inclusion in steel, make its ductility and toughness reduce.During steel rolling, because MnS is mingled with along with rolling direction extends, the anisotropy of steel is increased the weight of, time serious, causes Laminated steel.The high weldability to steel of sulphur content is unfavorable simultaneously.Phosphorus height increases the cold shortness of steel, makes the brittle transition temperature of steel increase.But consider actual process controllability, the present invention limits S≤0.015%, P≤0.018%.
Nitrogen: nitrogen belongs to harmful element in high-strength steel of the present invention, nitrogen seriously can reduce plasticity and the toughness of material.In the present invention, nitrogen exists with free state in steel, cause steel plate uncoiling and follow-up shaping time, when being subject to tensile stress, there is discontinuous yielding phenomenon, produce waist folding and yield point elongation at surface of steel plate, therefore need to limit nitrogen content.But too low nitrogen content can increase production cost.The present invention limits N≤0.0050%.
Aluminium: deoxidation and the effect in conjunction with free state nitrogen are played in aluminium effect in the present invention, and aluminium is strong oxidizing property forming element, and in steel, oxygen forms Al 2o 3remove when making steel.Aluminium is except combining with oxygen, and the nitrogen also and in steel combines, and forms the AlN of chemical combination state, thus reduces the nitrogen of free state, favourable to the continuous yield phenomenon of elimination.But aluminium is too high can form too much Al 2o 3be mingled with, and continuous casting easily blocks sprue gate.It is 0.020% ~ 0.055% that the present invention limits Al content.
A manufacture method for air conditioner compressor housing hot rolling acid-cleaning steel plate, the method comprises:
Molten steel carries out continuous casting and obtains continuous casting steel billet after Fruit storage, the mass percent of wherein said molten steel composition is: C:0.015% ~ 0.040%, Si:0.005% ~ 0.035%, Mn:0.15% ~ 0.35%, P≤0.018%, S≤0.015%, N≤0.0050%, Al:0.020% ~ 0.055%, surplus is iron and is unavoidably mingled with.
Continuous casting steel billet is in 1150 DEG C ~ 1180 DEG C heating, hot rolling is two-part rolling technology, roughing is 5 passage tandem rollings, roughing end temp is 960 ~ 1020 DEG C, hot-rolled intermediate billet thickness >=39mm, and finish rolling is 7 passage tandem rollings, in the rolling of austenite one phase district, finish rolling end temp is 870 DEG C ~ 920 DEG C, finish rolling draft >=86%, and the convexity of finishing rolling control hot-rolled steel sheet is 20um ~ 40um; After finish rolling, steel plate thickness is 2mm ~ 5mm, and section cooling adopts back segment cooling, batches to obtain coils of hot-rolled steel when coiling temperature is 580 DEG C ~ 620 DEG C; Coils of hot-rolled steel is being provided with and uncoiling again on the Abrollhaspel of the anti-crease rollers that comes into operation, is controlling that straightening unit elongation is 0.6% ~ 1.2% through straightening, pickling, batch and obtain finished product.
The manufacturing process system reason that the present invention takes is as follows:
1, the setting of continuous casting steel billet Heating temperature
Continuous casting steel billet Heating temperature is too high, and steel slab surface can generate too much iron scale, can not remove completely in hot rolling rough rolling process subsequently, then can be formed iron scale press-in hole or press-in hole by roll press-in surface of steel plate in finishing stands.These press-in hole or the iron scale be pressed in hole cannot be removed in follow-up acid cleaning process, form surface imperfection at surface of steel plate.As Heating temperature is too low, then cannot ensure finishing temperature, and Heating temperature is low, steel plate flow stress is large, increases mill load.Slab heating temperature of the present invention is set as 1150 DEG C ~ 1180 DEG C.
2, roughing end temp and workpiece thickness setting
Roughing end temp affects surface of steel plate iron scale equally, roughing end temp is too high, then at roughing mills on finishing train roller-way, intermediate blank surface forms too much secondary oxidation iron iron sheet, finishing stands is not easily removed, scenery with hills and waters shape iron scale spot flaw can be formed at surface of steel plate after pickling, affect steel plate outward appearance.Roughing end temp of the present invention is set as 960 DEG C ~ 1020 DEG C.
Workpiece thickness affects steel plate finishing temperature, particularly steel plate edge finishing temperature, if intermediate blank temperature is too low, on roughing mills to finishing train roller-way, temperature drop is excessive, follow-up finish rolling finishing temperature is caused to reduce, particularly steel plate edge temperature drop is very large, and steel plate edge is in ferrite+austenite two-phase region rolling, causes the sharply deterioration of forming property.Consider, the present invention sets workpiece thickness >=39mm.
3, finish rolling end temp setting
Finishing stands of the present invention is in the rolling of austenite one phase district, if finish rolling is too low, finishing stands is in ferrite+austenite two-phase region rolling, then can form the hot rolling texture being unfavorable for Pressing Deformation, the processability index plastic strain ratio of steel plate is sharply reduced, particularly steel plate anisotropy is serious, causes steel plate ftracture when Pressing Deformation or form ear defect processed.Finish rolling end temp is too high, then surface of steel plate iron scale is serious, not easily removes during pickling.Finish rolling end temp of the present invention is set as 870 DEG C ~ 920 DEG C.
4, the setting of hot-rolling coiling temperature
Hot-rolling coiling temperature is too high, then terminating to increase obviously to batching surface of steel plate iron scale thickness during this period of time in finish rolling, affecting follow-up pickling.As hot-rolling coiling temperature is too low, armor plate strength increases, and elongation declines, and also unfavorable to formability.Suitably low coiling temperature is conducive to the distortion dislocation produced when hot rolling preserved by steel plate, and dislocation can fix C, the atom N of free state, therefore favourable for elimination discontinuous yielding phenomenon.The coiling temperature scope of the present invention's setting is 580 DEG C ~ 620 DEG C.
5, the setting of hot-rolled steel sheet convexity
Hot-rolled steel sheet thickness is that centre is slightly thick, both sides are slightly thin on steel plate width direction, and this is not mainly in order to both sides vibration occurs steel plate when ensureing hot rolling.If but convexity is excessive, then steel plate different sites obtain blank subsequently compressor main housing roller circle shaping time produce seam gap size inconsistent, affect Plasma Welding.End cap stamping in addition and container for storing liquid, as thickness fluctuation is large, also can produce punching press gauffer defect.Therefore the plate crown of the present invention's setting is 20um ~ 40um.
6, pickling uncoiling and straightening technique are determined
It is extremely important that pickling uncoiling of the present invention and the waist of straightening technique to elimination steel plate roll over defect.Must be come into operation during uncoiling anti-crease rollers, the effect of anti-crease rollers is before band steel pull-out Abrollhaspel, first strong reverse bending, anti-crease rollers has very large cornerite with band steel, in this BENDING PROCESS, and the pressure influence of the anti-crease rollers that the distortion of belt steel surface is contacted with it, namely the viscous deformation of belt steel surface is carried out having under final condition, the viscous deformation of belt steel surface comparatively under free state evenly, deformation point is more, can not show obvious waist folding defect.
The present invention adopts straightening technique when pickling, and straightening first can carry out mechanical scale breading on the one hand before steel plate enters pickling tank, is conducive to the efficiency improving follow-up pickling.On the other hand by straightening, the yield point elongation of steel plate stretching curve can be eliminated, like this steel plate at follow-up making compressor housing time would not there is the defect of waist folding and barring.But straightening rate is too high, steel plate work hardening is serious, and elongation and forming property all can reduce.Straightening elongation of the present invention is set as 0.6% ~ 1.2%.
The microstructure of a kind of air conditioner compressor housing hot rolling acid-cleaning steel plate that the present invention obtains is the perlite of ferrite+a small amount of, grain size number is organized to be 8 ~ 9.5 grades, the yield strength scope of hot rolling acid-cleaning steel plate is 220 ~ 270MPa, tensile strength 320 ~ 370MPa, elongation after fracture 45 ~ 55%, plastic strain ratio weighted mean the absolute value of>=1.0, plastic strain ratio degree of anisotropy △ r values | △ r|≤0.15, yield point elongation rate Ae=0.
The present invention has following positively effect compared to existing technology:
1, the present invention is by suitable Composition Design and hot rolling technology design, obtain a kind of air conditioner compressor housing hot rolling acid-cleaning steel plate and can be applicable to main housing, end cap, container for storing liquid manufacture craft simultaneously, there is the problems such as intensity is improper, forming property is bad for the production of compressor of air conditioner main housing in the hot rolling acid-cleaning plate overcoming prior art production, the problems such as waist folding defect appear in shaping rear surface.
2, the feature of present component and technique is by suitable Composition Design, slab heating temperature, hot rolling roughing end temp, workpiece thickness, hot rolling finishing temperature, hot-rolling coiling temperature, hot-rolled sheet Crown control, hot rolling acid-cleaning uncoiling and straightening technique, a kind of air conditioner compressor housing hot rolling acid-cleaning plate obtained has suitable strength range, good forming property index, eliminates the uneven extension phenomenon of steel plate simultaneously.
Accompanying drawing explanation
Accompanying drawing 1 is the microstructure metallograph of the embodiment of the present invention 1.
Accompanying drawing 2 is the stress strain curve of the hot-rolled steel sheet of the embodiment of the present invention 1.
Accompanying drawing 3 is the stress strain curve of pickled plate after the straightening of the embodiment of the present invention 1.
Accompanying drawing 4 is the different hot-rolled intermediate billet thickness of the present invention and finishing temperature trial curve.
Embodiment
Disclosed in disclosed in embodiment 1 ~ 4 and comparative example 1-Chinese patent CN201110449207.3, comparative example 2-Chinese patent CN201210298855.8, the present invention will be further described, as shown in table 1 ~ table 4.
Table 1 chemical composition of the present invention (weight percent %), surplus is Fe and inevitable impurity.
  
According to the requirement of material composition design of the present invention; adopt molten iron pre-desulfurization; converter top bottom blowing; LF stove heats up and ensures that bottom blowing Ar churning time is greater than 5 minutes; RH stove carries out vacuum circulation degassing process; ensure that the pure degassing time of RH is greater than 15 minutes, then adopt low-carbon steel protecting slag, whole process is blown Ar protective casting and is become continuous casting steel billet.
Continuous casting steel billet is after process furnace reheats, rolling on Continuous Heat tandem rolling mill, process control parameter is in table 2, after roughing milling train and the controlled rolling of finish rolling Continuous mill train, with reference to accompanying drawing 4, hot-rolled intermediate billet thickness >=39mm, section cooling adopts back segment cooling, then batch, produce qualified hot-rolled sheet coil, steel plate thickness is 2mm ~ 5mm.
  
Table 2 hot rolling technology controling parameters of the present invention
Possessed and uncoiling again on the Abrollhaspel of the anti-crease rollers that comes into operation, controlling that straightening unit elongation is 0.6% ~ 1.2% through straightening, pickling, batch and obtain finished product by above-mentioned coils of hot-rolled steel, process control parameter is in table 3.
Table 3 acid cleaning process controling parameters of the present invention
The air conditioner compressor housing hot rolling acid-cleaning steel plate utilizing aforesaid method to obtain.With reference to accompanying drawing 1, the microstructure of hot rolling acid-cleaning steel plate is the perlite of ferrite+a small amount of, organizes grain size number to be 8 ~ 9.5 grades.
With reference to accompanying drawing 2,3, hot-rolled steel sheet the present invention obtained, hot rolling acid-cleaning steel plate carry out tension test according to " GB/T228.1-2010 metal material stretching test part 1: room temperature test method ", test according to " mensuration of GB/T 5027-2007 metal sheet and strip plastic strain ratio (r value) ", there is obvious yield point elongation in the stress strain curve of hot-rolled steel sheet, the stress strain curve of the pickled plate after straightening eliminates yield point elongation; The mechanical property of hot rolling acid-cleaning steel plate the results are shown in Table 4.
The yield strength scope of hot rolling acid-cleaning steel plate is 220 ~ 270MPa, tensile strength 320 ~ 370MPa, elongation after fracture 45 ~ 55%, plastic strain ratio weighted mean the absolute value of>=1.0, plastic strain ratio degree of anisotropy △ r values | △ r|≤0.15, yield point elongation rate Ae=0.
  
The mechanical property of table 4 hot rolling acid-cleaning steel plate of the present invention
From the performance of table 4,, there is performance inconsistency to making compressor of air conditioner main housing and cause greatly fluctuate large, rack of fusion and housing and container for storing liquid of shaping post gap to there is the technical problems such as punching press ear, cracking and can be resolved in the strength range that principal character of the present invention is suitable in order to hot rolling acid-cleaning plate has, good forming property index.
In addition to the implementation, the present invention can also have other embodiments.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of application claims.

Claims (6)

1. an air conditioner compressor housing hot rolling acid-cleaning steel plate, its chemical component weight per-cent is: C:0.015% ~ 0.040%, Si:0.005% ~ 0.035%, Mn:0.15% ~ 0.35%, P≤0.018%, S≤0.015%, N≤0.0050%, Al:0.020% ~ 0.055%, surplus is iron and is unavoidably mingled with.
2. air conditioner compressor housing hot rolling acid-cleaning steel plate as claimed in claim 1, its microstructure is the perlite of ferrite+a small amount of, and described grain fineness number of organizing is 8.0 ~ 9.5 grades.
3. air conditioner compressor housing hot rolling acid-cleaning steel plate as claimed in claim 1 or 2, the yield strength of its 2mm ~ 5mm thick hot rolling acid-cleaning steel plate steel plate is 220MPa ~ 270MPa, tensile strength is 320MPa ~ 370MPa, and elongation after fracture is 45% ~ 55%, plastic strain ratio weighted mean the absolute value of>=1.0, plastic strain ratio degree of anisotropy △ r values | △ r|≤0.15, yield point elongation rate Ae=0.
4. the manufacture method of the air conditioner compressor housing hot rolling acid-cleaning steel plate as described in as arbitrary in claim 1-3, comprising:
Molten steel carries out continuous casting and obtains continuous casting steel billet after Fruit storage;
Continuous casting steel billet carries out hot rolling after 1150 DEG C ~ 1180 DEG C heating, described hot rolling is two-part rolling technology, roughing is 5 passage tandem rollings, roughing end temp is 960 ~ 1020 DEG C, and finish rolling is 7 passage tandem rollings, in the rolling of austenite one phase district, finish rolling end temp is 870 DEG C ~ 920 DEG C, finish rolling draft is greater than 86%, and after finish rolling, section cooling adopts back segment cooling, batches to obtain coils of hot-rolled steel when coiling temperature is 580 DEG C ~ 620 DEG C;
Coils of hot-rolled steel is being provided with and uncoiling again on the Abrollhaspel of the anti-crease rollers that comes into operation, is controlling that straightening unit elongation is 0.6% ~ 1.2% through straightening, pickling, batch and obtain finished product.
5. the air conditioner compressor housing as claimed in claim 4 manufacture method of hot rolling acid-cleaning steel plate, its feature is being, the convexity of finishing rolling control hot-rolled steel sheet is 20um ~ 40um.
6. the air conditioner compressor housing manufacture method of hot rolling acid-cleaning steel plate as claimed in claim 4, it is characterized in that, after finish rolling, control steel plate thickness is 2mm ~ 5mm.
CN201410125386.9A 2014-03-31 2014-03-31 Hot-rolled pickled steel plate for air conditioner compressor housings and manufacturing method thereof Active CN104946969B (en)

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CN110747323A (en) * 2019-10-24 2020-02-04 马鞍山钢铁股份有限公司 Acid-washing cold-formed steel and manufacturing method thereof
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CN111690869A (en) * 2019-03-11 2020-09-22 上海梅山钢铁股份有限公司 Hot-rolled steel plate for cold-bending steel sheet pile and manufacturing method thereof
CN111996456A (en) * 2020-08-20 2020-11-27 马鞍山钢铁股份有限公司 Thick hot-dip galvanized steel with excellent bending property and production method thereof
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CN113025909A (en) * 2021-03-09 2021-06-25 马鞍山钢铁股份有限公司 Hot-rolled pickled plate for refrigerator compressor shell and production method thereof

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CN105925891A (en) * 2016-07-15 2016-09-07 武汉钢铁股份有限公司 Hot-rolled pickled steel with tensile strength of 310MPa grade and used for high-surface quality automobiles, and production method thereof
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CN107779743A (en) * 2016-08-30 2018-03-09 上海梅山钢铁股份有限公司 Micro- carbon hot rolling acid-cleaning steel plate and its manufacture method with good deep drawability
TWI649428B (en) * 2017-03-27 2019-02-01 日商杰富意鋼鐵股份有限公司 Two-piece can steel plate and manufacturing method thereof
CN108441759A (en) * 2018-02-13 2018-08-24 鞍钢股份有限公司 A kind of 540MPa grades of hot rolling acid-cleaning steel plate and its manufacturing method
CN109402353A (en) * 2018-10-31 2019-03-01 邯郸钢铁集团有限责任公司 A kind of method that compressor case is controlled with steel close limit hardness
CN111690869A (en) * 2019-03-11 2020-09-22 上海梅山钢铁股份有限公司 Hot-rolled steel plate for cold-bending steel sheet pile and manufacturing method thereof
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CN110747323A (en) * 2019-10-24 2020-02-04 马鞍山钢铁股份有限公司 Acid-washing cold-formed steel and manufacturing method thereof
CN111663075A (en) * 2020-04-09 2020-09-15 北京首钢股份有限公司 Pickled steel for stamping and preparation method and application thereof
CN111659990A (en) * 2020-06-12 2020-09-15 攀钢集团攀枝花钢铁研究院有限公司 Method for eliminating crystalline oxide on surface of welding joint
CN111996456A (en) * 2020-08-20 2020-11-27 马鞍山钢铁股份有限公司 Thick hot-dip galvanized steel with excellent bending property and production method thereof
CN112501513A (en) * 2020-11-30 2021-03-16 日照宝华新材料有限公司 Low-carbon acid-pickled steel with excellent formability and surface quality and production method thereof
CN113025909A (en) * 2021-03-09 2021-06-25 马鞍山钢铁股份有限公司 Hot-rolled pickled plate for refrigerator compressor shell and production method thereof

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