CN102424936A - Low temperature impact resistance allay structure steel and manufacture method thereof - Google Patents
Low temperature impact resistance allay structure steel and manufacture method thereof Download PDFInfo
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Abstract
The invention relates to a low temperature impact resistance allay structure steel. The steel comprises the following chemical element components, wherein the components comprise, by weight, 0.30-0.42% of carbon, 0.10-0.35% of silicon, 0.60-1.10% of manganese, 0.70-1.20% of chrome, 0.20-0.50% of nickel, 0.15-0.25% of molybdenum, less than or equal to 0.25% of copper, less than or equal to 0.015% of sulfur, less than or equal to 0.010% of phosphorus, 0.02-0.05% of niobium, 0.01-0.05% of titanium, 0.030-0.060% of aluminum, 60-180 ppm of nitrogen, 1.8-3.6% of manganese/carbon, and the balance of Fe and inevitable impurity elements. The manufacturing method comprises: melting scrap steel in an electric arc furnace, wherein the molten steel meets the following conditions: the [P] is less than or equal to 0.035%, the [C] is more than or equal to 0.05%, and the T is more than or equal to 1620 DEG C; adding a proper amount of lime or synthetic slag at the later tapping stage; adjusting the chemical components in a steel ladle refining furnace, wherein the Al is added at the primary deoxidation stage in the steel ladle refining furnace until the Al content is 0.05-0.10%, the stirring treatment is performed for more than or equal to 5 minutes; carrying out the treatment by a vacuum furnace for more than or equal to 15 minutes at the pressure less than or equal to 66.7 Pa; casting the steel ingot, cooling the mold for 16-24 hours, then demolding, and carrying out the next process to obtain the steel with the 900 MPa level, wherein the organization of the steel comprises pearlite and ferrite organization, and the low temperature resistance (-101 DEG C) of the steel is excellent.
Description
Technical field
The present invention relates to the structural alloy steel and the method for manufacture thereof of a kind of steel alloy, particularly low-temperature impact-resistant.
Background technology
Since the thirties in 20th century, the repeatedly accident of bridge member brittle failure had abroad taken place.Analysis revealed, metal or alloy is being lower than under the condition of certain critical temperature, and toughness sharply reduces, and character becomes fragile.This temperature (generally being a TR) is called the fragility critical transition temperature.
Technical requirements for low-temperature steel generally is to have enough intensity and sufficient toughness at low temperatures, has favorable manufacturability ability, processing characteristics etc.Wherein low-temperature flexibility prevents under the low temperature that promptly brittle rupture from taking place and the ability of expansion is most important factor.Various countries all stipulate out the certain notched bar impact strength under the minimum temperature usually.4 temperature ranks of the general branch of low-temperature steel :-20～-40 ℃ ,-50～-80 ℃ ,-100～-110 ℃ ,-196～-269 ℃.
Common low-temperature steel type has:
1) interalloy low carbon martensite type low-temperature steel
The alloying element total content is 5-10%, and it is organized as martensitic stucture.Typical case steel grade 9Ni steel has two kinds of heat treating regimes commonly used, and a kind of is that 900 ℃ of normalizings add 790 ℃ of normalizings and add 570 ℃ of tempering; Another kind is that 800 ℃ of shrends add 570 ℃ of tempering.Be organized as low carbon martensite after the quenching, be organized as low carbon martensite after the normalizing and add ferritic and add a small amount of high carbon austenitic.The 9Ni steel has good toughness under-196 ℃ of low temperature.Because phosphoric can increase the susceptibility of 9Ni steel temper brittleness, should strict control during smelting.The 5Ni steel is mainly controlled tissue through optimizing and three grades of heat treating methods of chemical ingredients, makes it under-162 ℃ and even-196 ℃ of low temperature, to have intensity and the toughness close with the 9Ni steel.
2) high alloy Austenitic low-temperature steel
Alloying element total content＞10% is austenitic stainless steel, has very good low-temperature flexibility, under-196～-296 ℃ of low temperature, still keeps quite high toughness.Contain chromium-nickel austenite type low-temperature steel and contain Cr18% and Ni9%, no chromium-nickel austenite type low-temperature steel contains M (martensite) 23-26%, A (austenite) 1-4%, the tough similar temperament of both low-temperature steels.Generally all after solution treatment, use.
3) low alloy steel
Alloying element content is general≤and 5%, generally use in interior warm area at-100 ℃, be used to make refrigerating apparatus, transportation equipment, ethene stowage space and petrochemical equipment etc. on the ground.Different with environment for use according to different intensity ranks, composition has than big-difference.
CN1718832A relates to a kind of low temperature high toughness weather corrosion resistant steel of 600MPa level; The technical purpose that its carbon content 0.05-0.09%, interpolation Ti, Nb, Ni, Cu, Cr reach low temperature resistant, corrosion-resistant, are prone to welding, on the low side but this patent does not indicate the TR, the intensity rank that are suitable for.CN101024870A relates to a kind of low-temperature high-strength, high-ductility steel and method of manufacture thereof, and its composition is a low-carbon (LC) Cr-Ni-Si-Mn-Mo-V steel alloy, can be used for being low to moderate-60 ℃ environment.CN1351189A relates to a kind of Ultra-low carbon H.T. anti-H 2 S with X65 level steel for gas delivering pipeline.
Existing low-temperature alloy structure iron is difficult to satisfy the working conditions that intensity rank is had relatively high expectations; Existing low-temperature alloy structure iron is applied to sheet material mostly, and the demand that then can not be satisfied with obdurability on the bar is used in the composition design of these steel grades; The use warm area of existing low-temperature alloy structure iron generally about-60 ℃, is difficult to satisfy-101 ℃ work condition environment.
Summary of the invention
The object of the present invention is to provide a kind of structural alloy steel of low-temperature impact-resistant.
Be the realization above-mentioned purpose, the structural alloy steel of low-temperature impact-resistant of the present invention, its chemical element composition by weight is: carbon: 0.30-0.42%, silicon: 0.10-0.35%; Manganese: 0.60-1.10%, chromium: 0.70-1.20%, nickel: 0.20-0.50%, molybdenum: 0.15-0.25%; Copper≤0.25%, sulphur≤0.015%, phosphorus≤0.010%; Niobium: 0.02-0.05%, titanium: 0.01-0.05%, aluminium: 0.030-0.060%; Nitrogen: 60-180ppm, manganese/carbon: 1.8-3.6, surplus is Fe and unavoidable impurities element.
The structural alloy steel of low-temperature impact-resistant of the present invention is the 900Mpa rank of perlite+ferritic structure.
Another object of the present invention is to provide the method for manufacture of the structural alloy steel of above-mentioned low-temperature impact-resistant.This method comprises:
In electric arc furnace, carrying out molten steel just refines; Ladle refining; The die casting cast; Produce the steel ingot of chemical ingredients certain size up to specification.
First furnace (electric arc furnace) melting waste steel, molten steel reaches: [P]≤0.035%, [C]>=0.05%, T>=1620 ℃;
The tapping later stage adds an amount of lime or synthetic slag; Ladle refining furnace adjustment chemical ingredients, ladle refining furnace deoxidation just adds Al to 0.05-0.10%, stirs >=5 minutes;
Vacuum oven is handled in the maintenance>=15 minutes down of≤66.7Pa pressure;
The cast steel ingot, the demoulding gets into next procedure after the cold 16-24 of mould hour.
Low-temperature impact-resistant steel of the present invention has good impact resistance under-101 ℃ of low-temperature working environment (ballistic work >=27J) is with the technical requirements of the low-temperature steel that satisfies extremely frigid zones or petrochemical industry.
Description of drawings
Fig. 1 is a rod iron sample (5# embodiment) in 860 ℃ of insulations water-cooled after 30 minutes, the grain fineness number picture after corroding, and rank is about 10 grades.
Fig. 2 is that (860 ℃ * 30 minutes oil coolings quench in rod iron sample (5# embodiment) thermal treatment in box heat treatment furnace; Tempering temperature 600 ℃ * 120 minutes; Air cooling) impact specimen of the 10mm * 10mm of post-treatment one-tenth; Open the dark V-type groove of 2mm, in subzero 101 ℃ of insulations 10 minutes, interrupting back employing scanning electron microscopic observation section was dimple columnar fracture.
Embodiment
Below the present invention is carried out comparatively detailed explanation.
Among the present invention, unless otherwise, content all refers to weight percent content.
For realizing the purpose that a kind of structural alloy steel of low-temperature impact-resistant is provided of the present invention, be not subject to any theory, the selection and the control of the main chemical elements of steel of the present invention the reasons are as follows:
Carbon: it is generally acknowledged that carbon worsens low-temperature flexibility.Yet carbon is the principal element that improves hardness of steel, guarantees that the certain intensity rank must certain carbon content.The carbon content of control 0.30-0.42% can reach the intensity rank of 900Mpa, makes steel have good low-temperature flexibility simultaneously.Preferably, carbon content is 0.30-0.41%.
Silicon: element silicon also has disadvantageous effect to low-temperature performance, but silicon can improve intensity, still is good reductive agent and reductor in smelting process.Silicon is controlled at 0.10-0.35% and can cooperates with other elements and satisfy the obdurability requirement in the steel of the present invention.Preferably, silicone content is 0.16-0.35%.
Manganese: manganese is to improve the low temperature impact properties element, and an amount of formed carbide plays the effect of dispersion-strengthened.Adding manganese content in the invention steel is 0.60-1.10%, and control Mn/C is 1.8-3.6.Preferably, manganese content is 0.7-1.0%.
Nickel: the nickel content of every increase by 1%, the fragility critical transition temperature can reduce about 20 ℃ approximately.But the nickel of every increase by 1% can cause the significantly increase of cost.From the consideration of economy, control nickel 0.20-0.50% is an ideal addition comparatively in the invention steel.Preferably, nickel content is 0.21-0.49%.
Chromium: chromium can significantly improve intensity and toughness, and chromium is good anti-oxidant and corrosive element, considers in the steel of the present invention and the compound action of other elements that chromium is controlled 0.70-1.20%.Preferably, chromium content is 0.75-1.15%.
Molybdenum: molybdenum ability crystal grain thinning, improve hardening capacity, can guarantee that steel have the certain intensity rank, can reduce temper brittleness in addition, avoid steel in the low temperature use, brittle rupture to occur.In the steel of the present invention, control Mo:0.15-0.25%.Preferably, molybdenum content is 0.16-0.24%.
Phosphorus, sulphur, copper: the impurity element in the steel, the significantly plasticity and the toughness of reduction steel.Particularly phosphorus harm is maximum, copper≤0.25% (being preferably 0.08-0.20%), and sulphur≤0.015%, phosphorus≤0.010% (be preferably≤0.009%).
Niobium, titanium: niobium, titanium are important micro alloying elements; Can play the effect of solution strengthening, refined crystalline strengthening, add the niobium of 0.02-0.05% (being preferably 0.019-0.049%) and the titanium of 0.01-0.05% (being preferably 0.011-0.049%) and can improve intensity and toughness simultaneously.
Aluminium and nitrogen: aluminium is reductor and alloying element important in the steel, and aluminium can crystal grain thinning.Research shows: the nitrogen element can form chromium nitride with the chromium element, and chromium nitride is a kind of small particle, and ability part replacement nickel element improves low-temperature performance.In addition, nitrogen can also combine to form titanium nitride with titanium, plays dispersion-strengthened action.Control aluminium content is 0.030-0.060% (being preferably 0.029-0.059%) among the present invention, and nitrogen content is 60-180ppm (being preferably 70-170ppm).
Lead, antimony, bismuth are the impurity elements in the steel simultaneously, under technical qualification permission situation, should reduce its content as far as possible.
The structural alloy steel preparation method of above-mentioned low-temperature impact-resistant, adopt the two-step process flow process: the first step: electric arc furnace just refines → ladle furnace vacuum refinement → cast steel ingot; Second step: rolling mill hot-work is rolling becomes a useful person.
The first step, electric arc furnace smelting-ladle refining-die casting cast
In the electric arc furnace of 20-250 ton, carrying out molten steel just refines; The ladle refining of corresponding tonnage; The die casting cast; Produce the steel ingot of chemical ingredients certain size up to specification.
Just furnace (electric arc furnace) adopts certain voltage and current melting waste steel, and molten steel reaches: [P]≤0.035%, [C]>=0.05%, T>=1620 ℃.The tapping later stage adds an amount of lime or synthetic slag.Ladle refining furnace adjustment chemical ingredients is advanced internal control, and ladle refining furnace deoxidation just adds Al to 0.05-0.10%, stirs >=5 minutes.Vacuum oven is handled under 66.7Pa pressure and was kept >=15 minutes.
After moving back pump, add the carbonization rice husk heat preserving agent, ladle bottom is blown into nitrogen (nitrogen flow 20-50Nm
3/ h, pressure 0.15-0.35Mpa, time 10-45min), bull ladle was poured into a mould after molten steel component met target.
Cast 2.3-25 ton steel ingot, the demoulding gets into next procedure after the cold 16-24 of mould hour.
Second step: rolling bar
Adopt rolling mill (blooming mill) hot-work rolling method, earlier qualified steel ingot rolling-cogging become billet, again billet hot-work is rolling to the finished product bar, technology point:
Blooming mill hot-work rolling-cogging, Rolling from Ingot is processed billet:
Process furnace heating process: 700-900 ℃ of insulation of steel ingot charging temperature 20-40 minute; Be warming up to 1220-1290 ℃ through 120-200 minute; Be incubated 60-180 minute; This soaking temperature is than the high 30-40 of common process ℃, with the abundant dissolving that guarantees microalloy with separate out.
The blooming mill rolling technology: press pair rolling technology, blooming mill becomes billet with qualified steel ingot rolling-cogging; Carry out the ingot head management, billet yield is not more than 86%.
Steel billet advances 24-48 hour (according to the specification of blank) of burial pit cooling, and cold blank carries out sand stripping finishing.Conventional structural alloy steel rolls the general annealing process that adopts in back, and the present invention stipulates the laggard burial pit slow cooling of steel billet whole stake cooling in heap, and main purpose is to prevent to ftracture and reduce the content of hydrogen in the steel.
Rolling mill hot-work is with billet rolling to bar:
Rolling mill process furnace heating process: Heating temperature 1050-1220 ℃, 80-120 minute heat-up time, the square billet male and female face temperature difference≤40 ℃ of steel billets are come out of the stove.
Common process is rolling, finishing temperature 800-900 ℃.
Steel Alloy element of the present invention≤3% that obtains, low cost, ME is brief.Steel of the present invention can be made into refrigerating apparatus, transportation equipment, ethene stowage space and petrochemical equipment on the ground after being rolled into bar or wire rod, can use in interior warm area at-100 ℃.Part under heat-treat condition, tensile strength Rm >=900MPa, ballistic work Akv >=27J (subzero 101 ℃) has good plasticity and toughness proportioning.Steel of the present invention after being rolled into bar or wire rod, original grain degree 8-11 level.Steel high purity of the present invention: inclusion rank low (detect and to satisfy according to GB/T 10561: A≤2, B≤2, C≤1, D≤1); Gas content (oxygen≤10ppm, hydrogen≤1.0ppm).
Embodiment
Embodiment of the present invention, its preparation method are to adopt the two-step process flow process: the first step: electric arc furnace just refines → ladle furnace vacuum refinement → cast steel ingot; Second step: rolling mill hot-work is rolling becomes a useful person.
The first step is carried out molten steel and is just refined in 40 tons electric arc furnace; The ladle refining of corresponding tonnage; The die casting method of making a bet is poured into a mould; Produce chemical ingredients 3.7 tons of steel ingot (steel ingot sizes: 460 * 564 * 1790) up to specification.
Second step: steel ingot advances 880 ℃ of insulations of process furnace charging temperature 35 minutes; Be warming up to 1260-1280 ℃ through 160 minutes; Be incubated 160 minutes; Blooming mill is pressed pair rolling technology, and blooming mill becomes 140mm * 140mm billet with qualified steel ingot rolling-cogging; Control billet yield 84%; Steel billet advances burial pit cooling 28 hours, and cold blank carries out sand stripping finishing; 140mm * 140mm billet advances 1140 ℃ of rolling mill process furnace Heating temperatures, and 130 minutes heat-up times, the square billet male and female face temperature difference≤40 ℃ of steel billets are come out of the stove; 850 ℃ of finishing temperatures.
Test Example 1: mechanical property
Measure the ys, tensile strength, elongation, relative reduction in area of steel of the present invention and according to the ballistic work under subzero 101 ℃ of the GB/T229 (the metal summer is than test with notched test piece method), its result sees table 2 according to GB/T228 (metallic substance tensile test at room temperature method) method.
The mechanical property of table 2 embodiment rod iron
Annotate: thermal treatment process: 860 ℃ * 30min oil cooling quenches; Tempering insulation time 120min, air cooling.
Fig. 1 is a rod iron sample (5# embodiment) in 860 ℃ of insulations water-cooled after 30 minutes, the grain fineness number picture after corroding, and rank is about 10 grades.
Fig. 2 is that (860 ℃ * 30 minutes oil coolings quench in rod iron sample (5# embodiment) thermal treatment in box heat treatment furnace; Tempering temperature 600 ℃ * 120 minutes; Air cooling) impact specimen of the 10mm * 10mm of post-treatment one-tenth; Open the dark V-type groove of 2mm, in subzero 101 ℃ of insulations 10 minutes, interrupting back employing scanning electron microscopic observation section was dimple columnar fracture.
The low-temperature impact-resistant alloy structure Steel Bar During that embodiment of the present invention is produced is processed component such as petrochemical industry fastening piece, safety member, all meets request for utilization through test each item performance, and special low-temperature performance obviously is superior to the structural alloy steel of similar intensity rank.
Claims (19)
1. the structural alloy steel of a low-temperature impact-resistant, its chemical element composition by weight is: carbon: 0.30-0.42%, silicon: 0.10-0.35%, manganese: 0.60-1.10%; Chromium: 0.70-1.20%, nickel: 0.20-0.50%, molybdenum: 0.15-0.25%, copper≤0.25%; Sulphur≤0.015%, phosphorus≤0.010%, niobium: 0.02-0.05%, titanium: 0.01-0.05%; Aluminium: 0.030-0.060%, nitrogen: 60-180ppm, manganese/carbon: 1.8-3.6, surplus is Fe and unavoidable impurities element.
2. the structural alloy steel of low-temperature impact-resistant as claimed in claim 1 is characterized in that, said steel is perlite+ferritic structure.
3. according to claim 1 or claim 2 the structural alloy steel of low-temperature impact-resistant is characterized in that said steel is the 900MPa rank.
4. like the structural alloy steel of the arbitrary described low-temperature impact-resistant of claim 1-3, it is characterized in that carbon: 0.30-0.41%.
5. like the structural alloy steel of the arbitrary described low-temperature impact-resistant of claim 1-4, it is characterized in that silicon: 0.16-0.35%.
6. like the structural alloy steel of the arbitrary described low-temperature impact-resistant of claim 1-5, it is characterized in that manganese: 0.7-1.0%.
7. like the structural alloy steel of the arbitrary described low-temperature impact-resistant of claim 1-6, it is characterized in that chromium: 0.75-1.15%.
8. like the structural alloy steel of the arbitrary described low-temperature impact-resistant of claim 1-7, it is characterized in that nickel: 0.21-0.49%.
9. like the structural alloy steel of the arbitrary described low-temperature impact-resistant of claim 1-8, it is characterized in that copper: 0.08-0.20%.
10. like the structural alloy steel of the arbitrary described low-temperature impact-resistant of claim 1-9, it is characterized in that molybdenum: 0.16-0.24%.
11. the structural alloy steel like the arbitrary described low-temperature impact-resistant of claim 1-10 is characterized in that, niobium: 0.019-0.049%.
12. the structural alloy steel like the arbitrary described low-temperature impact-resistant of claim 1-11 is characterized in that, titanium: 0.011-0.049%.
13. the structural alloy steel like the arbitrary described low-temperature impact-resistant of claim 1-12 is characterized in that, phosphorus≤0.009%.
14. the structural alloy steel like the arbitrary described low-temperature impact-resistant of claim 1-13 is characterized in that, nitrogen: 80-170ppm.
15. the method for manufacture like the structural alloy steel of the arbitrary described low-temperature impact-resistant of claim 1-14 comprises:
Melting waste steel in the electric arc furnace, molten steel reaches: [P]≤0.035%, [C]>=0.05%, T>=1620 ℃;
The tapping later stage adds an amount of lime or synthetic slag; Ladle refining furnace adjustment chemical ingredients, ladle refining furnace deoxidation just adds Al to 0.05-0.10%, stirs >=5 minutes;
Vacuum oven is handled in the maintenance>=15 minutes down of≤66.7Pa pressure;
The cast steel ingot, the demoulding gets into next procedure after the cold 16-24 of mould hour.
16. method as claimed in claim 15 is characterized in that, also comprises:
Steel ingot was 700-900 ℃ of insulation 20-40 minute; Be warming up to 1220-1290 ℃ through 120-200 minute; Be incubated 60-180 minute;
Blooming mill is rolling, and billet yield is not more than 86%;
Steel billet advances burial pit cooling 24-48 hour;
With billet rolling to bar.
17., it is characterized in that to bar, Heating temperature 1050-1220 ℃, 80-120 minute heat-up time, the square billet male and female face temperature difference≤40 ℃ of steel billets are come out of the stove with billet rolling like claim 15 or 16 described methods; Finishing temperature 800-900 ℃.
18. like the arbitrary described method of claim 15-17, it is characterized in that, after the vacuum-treat, also comprise: after moving back pump, add the carbonization rice husk heat preserving agent, ladle bottom is blown into nitrogen, bull ladle was poured into a mould after molten steel component met target.
19. method as claimed in claim 18 is characterized in that, nitrogen flow is 20-50Nm
3/ h, pressure 0.15-0.35MPa and time 10-45min.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107815613A (en) * | 2017-11-22 | 2018-03-20 | 五河县黄淮粮油机械有限公司 | It is a kind of to improve the stable processing method of dried noodle machine roller performance |
| CN110157980A (en) * | 2019-05-09 | 2019-08-23 | 南京钢铁股份有限公司 | A kind of tool joint steel with superior low temperature impact property |
| CN110438390A (en) * | 2019-09-03 | 2019-11-12 | 山东钢铁股份有限公司 | A kind of the petroleum pipeline valve body steel and its production method of the big specification pole material of Φ 280mm |
| CN110923545A (en) * | 2019-12-09 | 2020-03-27 | 马鞍山钢铁股份有限公司 | High-weather-resistance cold forging steel for 12.9-grade fastener and production method thereof |
| CN113025901A (en) * | 2021-03-03 | 2021-06-25 | 江苏联峰能源装备有限公司 | Steel for petroleum valve body and preparation method thereof |
| CN113106343A (en) * | 2021-04-02 | 2021-07-13 | 大冶特殊钢有限公司 | Bolted steel for ocean platform and manufacturing method thereof |
| CN110643881B (en) * | 2019-09-09 | 2021-08-10 | 南京钢铁股份有限公司 | Steel for large-specification wind power fastener and manufacturing method thereof |
| CN114134402A (en) * | 2021-05-18 | 2022-03-04 | 江阴兴澄特种钢铁有限公司 | Large-specification high-strength wind power fastener steel for offshore and rock and manufacturing method thereof |
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| JPH10121200A (en) * | 1996-08-26 | 1998-05-12 | Sumitomo Metal Ind Ltd | High strength steel material for shear reinforcing bar, and its production |
| CN102021485A (en) * | 2009-09-18 | 2011-04-20 | 宝山钢铁股份有限公司 | Medium carbon alloy steel |
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| JPH10121200A (en) * | 1996-08-26 | 1998-05-12 | Sumitomo Metal Ind Ltd | High strength steel material for shear reinforcing bar, and its production |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107815613A (en) * | 2017-11-22 | 2018-03-20 | 五河县黄淮粮油机械有限公司 | It is a kind of to improve the stable processing method of dried noodle machine roller performance |
| CN110157980A (en) * | 2019-05-09 | 2019-08-23 | 南京钢铁股份有限公司 | A kind of tool joint steel with superior low temperature impact property |
| CN110438390A (en) * | 2019-09-03 | 2019-11-12 | 山东钢铁股份有限公司 | A kind of the petroleum pipeline valve body steel and its production method of the big specification pole material of Φ 280mm |
| CN110643881B (en) * | 2019-09-09 | 2021-08-10 | 南京钢铁股份有限公司 | Steel for large-specification wind power fastener and manufacturing method thereof |
| CN110923545A (en) * | 2019-12-09 | 2020-03-27 | 马鞍山钢铁股份有限公司 | High-weather-resistance cold forging steel for 12.9-grade fastener and production method thereof |
| CN113025901A (en) * | 2021-03-03 | 2021-06-25 | 江苏联峰能源装备有限公司 | Steel for petroleum valve body and preparation method thereof |
| CN113106343A (en) * | 2021-04-02 | 2021-07-13 | 大冶特殊钢有限公司 | Bolted steel for ocean platform and manufacturing method thereof |
| CN114134402A (en) * | 2021-05-18 | 2022-03-04 | 江阴兴澄特种钢铁有限公司 | Large-specification high-strength wind power fastener steel for offshore and rock and manufacturing method thereof |
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Application publication date: 20120425 |