CN101343714B - 30CrMnSiB steel, weldless steel tube for cylinder and method of manufacturing the same - Google Patents
30CrMnSiB steel, weldless steel tube for cylinder and method of manufacturing the same Download PDFInfo
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Abstract
The invention provides a seamless steel pipe and a production method thereof used for 30CrMnSiB steel and cylinders. The 30CrMnSiB comprises the following components: 0.22 to 0.35 percent of carbon, 0.90 to 1.20 percent of silicon, 0.80 to 1.10 percent of manganese, 0.80 to 1.10 percent of chromium, 0.0005 to 0.0035 percent of boron, 0.05 percent or less than 0.05 percent of titanium, 0.035 percent or less than 0.035 percent of phosphorus, 0.035 percent or less than 0.035 percent of sulfur, 0.30 percent or less than 0.30 percent of nickel, 0.20 percent or less than 0.20 percent of copper, 0.10 percent or less than 0.10 percent of molybdenum, 0.05 percent or less than 0.05 percent of aluminum, balance iron. The initial smelting of the seamless steel pipe is performed through a converter or an electric furnace, the fine smelting is carried out through an LF furnace so as to produce a steel ingot used for a rolled pipe, or the steel ingot used for the rolled pipe is manufactured with a cyclical pipe rolling machine unit or a continuous pipe rolling machine unit through continuous casting, and after the quenching and high temperature tempering and seasoning heat treatment are implemented to the manufactured seamless steel pipe, the yield point Delta-s is within 945 to 1230MPa, the tensile strength Delta-b is within 1050 to 1370MPa, the rupture elongation rate Delta-5 is 12 to 16.5 percent, the normal temperature impact power Aku2 is 34 to 91J, and after the seasoning heat treatment is implemented to a hot rolling final steel pipe, the hot rolling final steel pipe can be applied in various hydraulic cylinder bodies in the engineering machinery and coal mine hydraulic support fields.
Description
Technical field
The present invention relates to a kind of cylinder body with weldless steel tube and production method thereof, belong to the ferrous metallurgy field.
Background technology
In the seventies in last century is that the domestic seamless steel tube production producer of representative is the weldless steel tube that the 27SiMn steel grade that can save alloying elements such as more expensive Cr and Mo that 25CrMo4,30CrMo, the materials such as 40Cr, 30CrMnSi selected for use outside the subrogate country are developed is applied to make parts such as cylinder body and stack shell with the Chengdu Gapless Rail Factory.Except that minority was carbon steel, its main steel grade was the 27SiMn steel to domestic hydraulic cylinder with weldless steel tube.Service condition through more than 30 years shows, the 27SiMn steel is through after modified, have high strength, high tenacity, wear resistance and good weldability, machinability and chromium plating performance preferably, can satisfy the service requirements of cylinder bodies such as general hydraulic prop pipe, so the 27SiMn weldless steel tube is extensive use of on various cylinder bodies.
In recent years, along with developing rapidly of coal in China industry and construction machinery industry, the maximization of coal winning machinery and engineering machinery makes the cylinder diameter of oil cylinder of its use increasing, the increase of hydraulic pressure makes the wall thickness of oil cylinder more and more thicker, and the obdurability of steel had higher requirement, so the 27SiMn weldless steel tube has demonstrated obvious deficiency.Mainly show, the hardening capacity deficiency of steel pipe, when the oil cylinder wall thickness surpassed 30mm, the mechanical property after the 27SiMn steel pipe integral is modified was difficult to satisfy the requirement of yield strength greater than 835MPa; The 27SiMn steel is relatively more responsive to temper brittleness.
As trace element, boron has remarkable influence to the tissue and the performance of steel, is of few, the most pronounced effects of consumption in the trace alloying element.Can significantly improve the hardening capacity of steel and replace more expensive alloying element as trace (0.0005%～0.0030%) boron, its effect and interpolation 0.6%Mn, 0.7%Cr, 0.5%Mo or 1.6%Ni are suitable.China has a large amount of boron resources, can utilize boron to save alloying elements such as a large amount of Cr, Mo, and is economical and practical.Boron is as lively as a cricket element, is easy to form stable inclusion and lose its useful effect with O, N chemical combination in steel, only is solid-solubilized in the effect that effective boron in the steel just can play tangible raising hardening capacity.Therefore the widespread use of boron-containing steel must be when smelting based on good deoxidation, refining with reasonably add the boron method.
Summary of the invention
Technical problem to be solved by this invention provides the high steel grade of a kind of hardening capacity, 30CrMnSiB steel.The component of steel (weight percent) is: carbon 0.22%～0.35%, silicon 0.90%～1.20%, manganese 0.80%～1.10%, chromium 0.80%～1.10%, boron 0.0005%～0.0035%, titanium≤0.05%, phosphorus≤0.035%, sulphur≤0.035%, nickel≤0.30%, copper≤0.20%, molybdenum≤0.10%, aluminium≤0.05%, iron surplus.
30CrMnSiB steel provided by the invention has used an amount of boron and titanium, has increased substantially to very economical the hardening capacity of material; This steel grade is suitable for producing the cylinder body weldless steel tube simultaneously, especially is fit to the heavy caliber thick wall hydraulic prop pipe of thickness of steel pipe S 〉=30mm and obdurability is had the cylinder body steel pipe of requirements at the higher level.
Another technical problem to be solved by this invention provides the production method of above-mentioned steel.
Add the ratio that an amount of titanium can guarantee to be solid-solubilized in the effective boron in the steel in the boron-containing steel, the principle of control is Ti/N in the steel 〉=4.When Ti/N in the steel 〉=4, effectively the boron ratio regular meeting that accounts for full boron surpasses 70%.Add micro-titanium crystal grain thinning effectively in the steel, cooperate with right amount of boron and can obviously lower the temper brittleness of steel about 250～400 ℃.The present invention adds the boron and the titanium of trace in the 30CrMnSi steel grade, purpose is when improving hardening capacity, the crystal grain of refinement steel, the toughness and the impact property of raising steel.
30CrMnSiB ladle of the present invention is drawn together following steps:
A, employing converter or electric furnace just refine
To being that main material production is just made steel water with steel scrap, the pig iron and molten iron, carbon 〉=0.06%, phosphorus≤0.020% in its tapping molten steel, sulphur≤0.040%, tapping temperature is 1620～1680 ℃; Pre-deoxidation in ladle in tapping process.
B, the refining of LF stove
Molten steel is transported to by ladle and carries out refining in the LF stove, and the feeding aluminium wire continues deoxidation in the LF refining furnace, adds slag making materials diffusive deoxidations such as refined synthetic slag.The good back of deoxidation of molten steel adds ferrosilicon and materials such as ferrochrome, ferromanganese and carburelant, and it is qualified in the LF stove main chemical compositions (C, Cr, Si, Mn) of molten steel to be adjusted.In the whole process, ladle bottom blowing Ar is unimpeded, avoids molten steel exposed simultaneously.
When the white slag hold-time enough (time 〉=15min) and sulphur put in place, (or adding SiAlBaCa1.0Kg/t steel) carries out final deoxygenation about hello aluminium wire 100m, adds FeTi again, adds FeTi and stirs more than the 3min with the low Ar intensity of blowing, add FeB (B 〉=15%, iron surplus) again; Feed CaSi silk 0.5～0.8Kg/t steel behind the LF furnace accretion bundle, refining slag basicity reaches (CaO/SiO
2)＜5, tapping when blowing more than 5 minutes only with less Argon intensity, tapping temperature is 1550～1600 ℃.
Further, in order to stabilize and increase the recovery rate of boron, eliminate because the situation that the ferro-boron globule size causes recovery rate to fluctuate widely, adopt the ferro-boron end of packing into is sealed with reinforcing bar, an end is with the method that adds in the steel pipe of iron sheet sealing in the LF stove ladle
C, tube rolling are cast with steel ingot
The molten steel casting temperature is 1540～1580 ℃, can adopt round wave steel ingot or the circular steel ingot of φ 450～φ 700mm to cast.Also can adopt the casting mode of round billet continuous casting, tundish temperature is by 1510～1550 ℃ of controls during the continuously cast bloom cast.
Another technical problem to be solved by this invention provides a kind of weldless steel tube, and it is to be heated to 1220 ℃～1260 ℃ by the 30CrMnSiB steel, is rolled into the weldless steel tube of desired size requirement.
Above-mentioned weldless steel tube is through 830 ℃～920 ℃ oil quenchings and 500 ℃～580 ℃ tempering water-cooleds, modified thermal treatment, the various hydraulic cylinders that can be used for fields such as engineering machinery, coal mine hydraulic supporting especially are fit to the heavy caliber thick wall hydraulic prop pipe of thickness of steel pipe S 〉=30mm and obdurability are had the cylinder body weldless steel tube of requirements at the higher level.
Further, cylinder body of the present invention is 945～1230MPa with the yield-point σ s of weldless steel tube, and tensile strength sigma b is 1050～1370MPa, and elongation after fracture δ 5 is 12～16.5%, and normal temperature ballistic work Aku2 is 34～91J.
Contribution of the present invention is: do not change the working condition of original high-quality steel grade, adopt means such as preferred chemical ingredients, optimization production technology, reach the technical requirements of the various hydraulic cylinders in fields such as engineering machinery, coal mine hydraulic supporting.A kind of technical requirements of satisfying coal in China industry and construction machinery industry is provided, the novel cylinder body weldless steel tube steel grade of production technique science, easy to operate, economic and reliable, not only safe and reliable, and can save the metal usage quantity, to satisfy market demands better.Every good mechanical performance after the steel product batch production, hardening capacity is good, especially is fit to wall thickness greater than the production of 30mm with upper cylinder body.Thereby can save the metal usage quantity and save social resources, to satisfy weldless steel tube is used in market to high strength, high tenacity cylinder body requirement better.
Embodiment
The invention provides a kind of 30CrMnSiB steel.The component of steel (weight percent) is: carbon 0.22%～0.35%, silicon 0.90%～1.20%, manganese 0.80%～1.10%, chromium 0.80%～1.10%, boron 0.0005%～0.0035%, titanium≤0.05%, phosphorus≤0.035%, sulphur≤0.035%, nickel≤0.30%, copper≤0.20%, molybdenum≤0.10%, aluminium≤0.05%, iron surplus.This steel grade is suitable for producing the cylinder body weldless steel tube, especially is fit to the heavy caliber thick wall hydraulic prop pipe of thickness of steel pipe S 〉=30mm and obdurability is had the cylinder body steel pipe of requirements at the higher level.Its preparation method is finished by following steps:
A, employing converter or electric furnace just refine
To being that main material production is just made steel water with steel scrap, the pig iron and molten iron, carbon 〉=0.06%, phosphorus≤0.020% in its tapping molten steel, sulphur≤0.040%, tapping temperature is 1620～1680 ℃; Pre-deoxidation in ladle in tapping process.
B, the refining of LF stove
Molten steel is transported to by ladle and carries out refining in the LF stove, and the feeding aluminium wire continues deoxidation in the LF refining furnace, adds slag making materials diffusive deoxidations such as refined synthetic slag.The good back of deoxidation of molten steel adds ferrosilicon and materials such as ferrochrome, ferromanganese and carburelant, and it is qualified in the LF stove main chemical compositions (C, Cr, Si, Mn) of molten steel to be adjusted.In the whole process, ladle bottom blowing Ar is unimpeded, avoids molten steel exposed simultaneously.
When the white slag hold-time enough (time 〉=15min) and sulphur put in place, (or adding SiAlBaCa1.0Kg/t steel) carries out final deoxygenation about hello aluminium wire 100m, add FeTi (Ti:30% again, iron surplus), adding FeTi stirs more than the 3min with the low Ar intensity of blowing, add FeB (B:18%, iron surplus) again; Feed CaSi silk 0.5～0.8Kg/t steel behind the LF furnace accretion bundle, refining slag basicity reaches (CaO/SiO
2)＜5, tapping when blowing more than 5 minutes only with less Argon intensity, tapping temperature is 1550～1600 ℃.
Further, in order to stabilize and increase the recovery rate of boron, eliminate because the situation that the ferro-boron globule size causes recovery rate to fluctuate widely, adopt the ferro-boron end of packing into is sealed with reinforcing bar, an end is with the method that adds in the steel pipe of iron sheet sealing in the LF stove ladle
C, tube rolling are cast with steel ingot
The molten steel casting temperature is 1540～1580 ℃, can adopt round wave steel ingot or the circular steel ingot of φ 450～φ 700mm to cast.Also can adopt the casting mode of round billet continuous casting, tundish temperature is by 1510～1550 ℃ of controls during the continuously cast bloom cast.
Wherein, described pre-deoxidation can adopt adding Si-Al-Ba-Ca (calcium 〉=10%, barium 〉=13%, aluminium 〉=8%, silicon 〉=50%, carbon≤2.0%, phosphorus≤0.10%, sulphur≤0.15%, copper≤0.30%, iron surplus) and aluminium block (aluminium 〉=99%) to carry out pre-deoxidation.
The ferrosilicon that adopts in the smelting process, ferromanganese, carburelant, CaSi silk, refined synthetic slag etc. can adopt commercially available qualified product, as long as can reach smelting requirements, satisfy each chemical ingredients and adjust qualified getting final product.
Mode below by embodiment is described further the present invention, is limitation of the present invention but should not be construed as.The part material chemical constitution that following examples adopt is as follows:
Ferrosilicon: silicon 〉=70%, manganese≤0.4%, carbon≤0.01%, aluminium≤1.0%, iron surplus;
Ferromanganese: carbon≤1.0%, manganese 〉=75%, silicon≤1.0%, iron surplus;
Ferrochrome: chromium 62.0～72.0%, carbon 3.0～6.0%, sulphur≤0.05%, phosphorus≤0.06%, iron surplus;
Carburelant: C 〉=90%, S≤0.5%, H
2O≤0.5%;
Aluminium wire: Al 〉=99.00%, Fe≤0.5%, Si≤0.45%, Mg≤0.05%;
CaSi silk: Ca 〉=28%, Si 55～65%, Al≤2.4%, C≤0.8%, P≤0.04%, S≤0.06%, H
2O≤0.5%;
Refined synthetic slag: CaO 64～68%, CaF
210～14%, Al
2O
39～13%.
The preparation of embodiment 1 30CrMnSiB weldless steel tube of the present invention
(1) in uhp electric arc furnace, adds molten iron and steel scrap, the ratio of molten iron and steel scrap is 24.4%:75.6%, through adding ton lime of steel 33.3kg and spraying into an amount of carbon dust slag making, when liquid steel temperature is 1650 ℃, C in the molten steel is 0.10%, P is 0.011%, and S is tapping in 0.035% o'clock, adds 4.0Kg/t in tapping process in ladle
Molten steelHigh carbon ferromanganese and 4.0Kg/t
Molten steelThe Si-Al-Ba-Ca pre-deoxidation.
(2) molten steel is transported to by ladle and carries out refining in the LF stove: feed 0.90Kg/t in the LF refining furnace
Molten steelAluminium wire continue deoxidation, feed the Al silk and finish the back and add 13.33Kg/t
Molten steelRefined synthetic slag and 0.5Kg/t
Molten steelMaterial slag making diffusive deoxidations such as calcium carbide.The good back of deoxidation of molten steel adds ferrosilicon and materials such as ferrochrome, ferromanganese and carburelant, in the LF stove, the main chemical compositions of molten steel adjusted qualified (C:0.29%, Si:0.98%, Mn:0.92%, Cr:0.93%).In the whole process, ladle bottom blowing Ar is unimpeded, avoids molten steel exposed simultaneously.
(3) LF refining furnace white slag hold-time 〉=17min, sulphur are 0.004%, feed the about 0.20Kg/t of aluminium wire this moment
Molten steelAbout (or add SiAlBaCa 1.0Kg/t
Molten steel) carry out final deoxygenation after, add FeTi alloy (Ti:30%, iron surplus) 1.5Kg/t again
Molten steel, add FeTi and stir 4min with the low Ar intensity of blowing, adopt again the ferro-boron end of packing into is sealed with reinforcing bar, an end adds FeB (B:18%, iron surplus) 1.2Kg/t with the method that adds in the steel pipe of iron sheet sealing in the LF stove ladle
Molten steelFeed CaSi silk 0.55Kg/t steel, refining slag basicity (CaO/SiO behind the LF furnace accretion bundle
2Tapping in 7 minutes is blown only with less Argon intensity in back)=4.0.LF refining furnace tapping temperature is 1560 ℃.
The weight percent component of gained 30CrMnSiB is:
C：0.30％，Si：0.99％，Mn：0.92％，Cr：0.92％，S：0.003％，P：0.017％，Ni：0.04％，Mo：0.01％，Cu：0.07％，Al：0.017％，Ti：0.025％，B：0.0018％。
(4) the molten steel casting temperature is 1553 ℃, adopts the round wave steel ingot of φ 550mm/3.3t to cast.
(5) steel ingot is heated to 1265 ℃ at ring furnace, maximum heating temperature is less than 1280 ℃.By Mannesmann piercing mill steel ingot is pierced into hollow billet, be rolled into the thick-walled seamless steel pipes of φ 395 * 60 specifications again by rotary forge mill.
The 30CrMnSiB weldless steel tube that adopts aforesaid method to produce is made the sample that blank dimension is 25mm, after the modified thermal treatment through 880 ℃ of oil quenchings and 520 ℃ of tempering water-cooleds, its yield-point σ s is 1150MPa, tensile strength sigma b is 1270MPa, elongation after fracture δ 5 is 16%, and normal temperature ballistic work Aku2 is 65J.
The preparation of embodiment 2 30CrMnSiB weldless steel tubes of the present invention
(1) add molten iron and steel scrap in converter, the ratio of molten iron and steel scrap is 90%:10%, through slag charges such as adding lime, when liquid steel temperature is 1660 ℃, the C in the molten steel is 0.08%, and P is 0.010%, S is tapping in 0.035% o'clock, adds 4.0Kg/t in tapping process in ladle
Molten steelHigh carbon ferromanganese and 2.0Kg/t
Molten steelSi-Al-Ba-Ca, 1.0Kg/t
Molten steelThe aluminium block pre-deoxidation.
(2) molten steel is transported to by ladle and carries out refining in the LF stove, and is a certain amount of that aluminium wire continues deoxidation according to adding after the sampling analysis situation in the LF refining furnace, utilizes the material slag making diffusive deoxidations such as refined synthetic slag that add the 14.0Kg/t molten steel.The good back of deoxidation of molten steel adds ferrosilicon and materials such as ferrochrome, ferromanganese and carburelant, in the LF stove, the main chemical compositions of molten steel adjusted qualified (C:0.29%, Si:0.95%, Mn:0.97%, Cr:0.98%).In the whole process, ladle bottom blowing Ar is unimpeded, avoids molten steel exposed simultaneously.
(3) when behind the white slag hold-time 16min, after sulphur is 0.005%, feed the about 0.20Kg/t of aluminium wire
Molten steelAbout (or add SiAlBaCa 1.0Kg/t
Molten steel) carry out final deoxygenation after, add FeTi alloy (Ti:30%, iron surplus) 1.5Kg/t again
Molten steel, add FeTi and stir 4min with the low Ar intensity of blowing, adopt again the ferro-boron end of packing into is sealed with reinforcing bar, an end adds FeB (B:18%, iron surplus) 1.2Kg/t with the method that adds in the steel pipe of iron sheet sealing in the LF stove ladle
Molten steelFeed CaSi silk 0.50Kg/t steel behind the LF furnace accretion bundle, and refining slag basicity (CaO/SiO
2Tapping in 6 minutes is blown only with less Argon intensity in back)=4.1.The refining furnace tapping temperature is 1575 ℃.
Gained 30CrMnSiB weight percent component is:
C：0.30％，Si：0.96％，Mn：0.97％，Cr：0.96％，S：0.003％，P：0.016％，Ni：0.04％，Mo：0.01％，Cu：0.06％，Al：0.021％，Ti：0.025％，B：0.0019％。
(4) during continuous casting of molten steel, tundish temperature is 1530 ℃, adopts the 4 stream caster machines of φ 350mm to cast, and adopts the argon for protecting pouring mouth of a river during cast.
(5) will descend the continuously cast bloom of scale to be heated to 1260 ℃ at ring furnace, maximum heating temperature is less than 1280 ℃.By becoming the weldless steel tube finished product behind the perforation of 340MPM tube rolling unit, tube rolling, the sizing, trimmed size is φ 299 * 30mm.
The 30CrMnSiB weldless steel tube that adopts aforesaid method to produce is made the sample that blank dimension is 25mm, after the modified thermal treatment through 880 ℃ of oil quenchings and 520 ℃ of tempering water-cooleds, its yield-point σ s is 1130MPa, tensile strength sigma b is 1250MPa, elongation after fracture δ 5 is 17%, and normal temperature ballistic work Aku2 is 68J.
Claims (3)
1.30CrMnSiB the production method of steel is characterized in that: the weight percent component of 30CrMnSiB steel is: carbon 0.22%～0.35%, silicon 0.90%～1.20%, manganese 0.80%～1.10%, chromium 0.80%～1.10%, boron 0.0005%～0.0035%, titanium≤0.05%, phosphorus≤0.035%, sulphur≤0.035%, nickel≤0.30%, copper≤0.20%, molybdenum≤0.10%, aluminium≤0.05%, iron surplus; Wherein titanium content is not 0, and its preparation method may further comprise the steps:
A, employing converter or electric furnace just refine:
With steel scrap, the pig iron and molten iron is that main material production is just made steel water, wherein, in the tapping molten steel, carbon 〉=0.06%, phosphorus≤0.020%, sulphur≤0.040%, tapping temperature is 1620～1680 ℃;
B, in tapping process, in ladle, adopt to add Si-Al-Ba-Ca and aluminium block carries out pre-deoxidation; The chemical constitution of described Si-Al-Ba-Ca is by weight percentage: calcium 〉=10%, barium 〉=13%, aluminium 〉=8%, silicon 〉=50%, carbon≤2.0%, phosphorus≤0.10%, sulphur≤0.15%, copper≤0.30%, iron surplus; Aluminium in the aluminium block 〉=99%;
C, ladle are transported to and carry out refining in the LF stove:
Molten steel continues deoxidation in the LF refining furnace, after deoxidation is good molten steel is added ferrosilicon, ferrochrome, ferromanganese or carburelant and adjust, make each chemical ingredients satisfy: carbon 0.22%～0.35%, silicon 0.90%～1.20%, manganese 0.80%～1.10%, chromium 0.80%～1.10%, boron 0.0005%～0.0035%, titanium≤0.05%, phosphorus≤0.035%, sulphur≤0.035%, nickel≤0.30%, copper≤0.20%, molybdenum≤0.10%, aluminium≤0.05%; Wherein,
The chemical constitution of ferrosilicon, ferromanganese, ferrochrome, carburelant: ferrosilicon: silicon 〉=70%, manganese≤0.4%, carbon≤0.01%, aluminium≤1.0%, iron surplus; Ferromanganese: carbon≤1.0%, manganese 〉=75%, silicon≤1.0%, iron surplus; Carburelant: C 〉=90%, S≤0.5%, H
2O≤0.5%; Ferrochrome: chromium 62.0～72.0%, carbon 3.0～6.0%, sulphur≤0.05%, phosphorus≤0.06%, iron surplus;
After white slag hold-time 〉=15min and sulphur put in place, feed aluminium wire or add after SiAlBaCa carries out final deoxygenation, add the FeTi alloy again, add the FeB refining again; Wherein, add FeB and be the FeB end of packing into is sealed with reinforcing bar, an end is with adding in the steel pipe of iron sheet sealing in the LF stove ladle;
Feed the CaSi silk then, when refining slag basicity reaches CaO/SiO
2＜5 back Argons, tapping, tapping temperature is 1550～1600 ℃;
Wherein, the chemical constitution of described aluminium wire, CaSi silk, aluminium wire: Al 〉=99.00%, Fe≤0.5%, Si≤0.45%, Mg≤0.05%; CaSi silk: Ca 〉=28%, Si55～65%, Al≤2.4%, C≤0.8%, P≤0.04%, S≤0.06%, H
2O≤0.5%;
D, tube rolling are cast with steel ingot: the molten steel casting temperature is 1540～1580 ℃; Tundish temperature is by 1510～1550 ℃ of controls during the continuously cast bloom cast.
2. the production method of 30CrMnSiB steel according to claim 1 is characterized in that: in the whole LF refining process of c step, ladle bottom blowing Ar is unimpeded, avoids molten steel exposed simultaneously.
3. the production method of 30CrMnSiB steel according to claim 1 is characterized in that: the d step adopts the round wave steel ingot of φ 450～φ 700mm or circular steel ingot is cast or adopt the casting mode of round billet continuous casting to cast.
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| CN102560242A (en) * | 2010-12-15 | 2012-07-11 | 鞍钢股份有限公司 | A production method of a seamless steel pipe for a single hydraulic prop |
| CN102409132B (en) * | 2011-12-05 | 2013-04-24 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for producing 25CrMnB steel through converter flow |
| CN102517513B (en) * | 2012-01-12 | 2014-05-14 | 承德建龙特殊钢有限公司 | Steel for high-strength, corrosion-resistant and high-anti-seismic-performance hydraulic supporting column and preparation process thereof |
| CN103320711B (en) * | 2013-06-26 | 2016-01-20 | 衡阳华菱钢管有限公司 | Weldless steel tube and manufacture method thereof |
| CN111304529A (en) * | 2019-12-02 | 2020-06-19 | 张子夜 | Seamless steel tube for multi-stage oil cylinder and manufacturing method thereof |
| CN113930584B (en) * | 2021-09-17 | 2023-03-21 | 包头钢铁（集团）有限责任公司 | Method for improving production stability of high-silicon aluminum killed steel |
| CN114733927A (en) * | 2022-04-21 | 2022-07-12 | 山东汇通工业制造有限公司 | Seamless steel pipe for 40CrB track pin bush |
| CN115584435B (en) * | 2022-08-30 | 2023-06-30 | 浙江钱富万向节有限公司 | High-strength steel for cold extrusion molding of heavy cross shaft and preparation method thereof |
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