CN102051530A - 48MnV nitrogenous steel and nitrogen adding process thereof - Google Patents
48MnV nitrogenous steel and nitrogen adding process thereof Download PDFInfo
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Abstract
The invention belongs to the field of metallurgy and relates to 48MnV nitrogenous steel and a nitrogen adding process thereof. The 48MnV nitrogenous steel comprises the following components: 0.45-0.51% of C, 0.17-0.37% of Si, 1.00-1.20% of Mn, 0.06-0.11% of V, 0.000-0.025% of Ti, 0.05-0.25% of Cr, 0.00-0.06% of Mo, 0.00-0.06% of Ni, 0.00-0.20% of Cu, 0.0080-0.0150% of N, at most 0.035% of P, at most 0.035% of S, at most 0.020% of O, 0.087-0.097% of Ceq and the balance of Fe and impurities; and the nitrogen adding process is carried out while the N content is controlled to be 0.0080-0.0150%, preferably 0.0090-0.0120%, wherein the target value is 0.0110%, and a manganese nitride iron wire is fed into the steel according to the calculated quantity in one step after a vacuum process is completed. By changing the pre-vacuum nitrogen adding and alloying into the post-vacuum nitrogen adding and alloying, the invention changes the technological process of pre-vacuum nitrogen alloying and post-vacuum slight nitrogen regulation in the metallurgy field, thereby enabling the 48MnV nitrogenous steel to obtain good comprehensive mechanical properties, and improving the strength and toughness.
Description
Technical field
The invention belongs to field of metallurgy, relate to a kind of nitrogenous steel and add nitrogen technology, a kind of specifically 48MnV nitrogenous steel and add nitrogen technology.
Background technology
The 48MnV nitrogenous steel is the forge hot non-hardened and tempered steel, is mainly used in the manufacturing crankshaft of diesel engine, and the 48MnV steel is that Mn-V is perlite+ferrite type non-hardened and tempered steel.The accurate control of the nitrogen content of the nitrogenous steel that 48mnV etc. are high-level is a difficult problem on metallurgical boundary always.Though it is multiple that the control method of the nitrogen content of steel has, nitrogen blowing can be described as the easiest most economical a kind of method in molten steel, and the prerequisite of this method is: the nitrogen killer that more amount is arranged in the molten steel.We have all carried out strict control to C, Mn, Cr, V, Nb, Ti, S, Al, O, N, H and residual element and Ceq this steel of 48MnV when composition designs, the steel very strict for this requirement of 48MnV and the composition requirement is very narrow, as take the way of nitrogen blowing, will bring the very great fluctuation process of composition, material, performance.
The current at present nitrogen pick-up way that adopts in the metallurgical boundary of the nitrogenous steel of 48MnV is to add nitrogenized manganese in stove; chromium nitride; iron alloys such as vanadium nitride; the back nitrogen pick-up but this way is tapped before vacuum; concrete technology be before the vacuum in the LF station toward steel in adding nitrogenized manganese and nitrogen flushing realize; yet after vacuum outgas; nitrogen is also still often got back to the nitrogen content level when not adding nitrogen before the vacuum; have to after VD stove vacuum, add again the nitrogenized manganese of equal amts; cause the waste of nitrogen-containing alloy; if manganese; chromium control is improper; then consequence is very serious; on the low side at N content; when Cr or Mn have reached target value; add alloy again, it is more then can to cause Cr or Mn to exceed target value, substantially all is narrow Composition Control steel and this class contains the N steel grade; generally all be strict by a Composition Control; contain the N alloy in case mend again, to be difficult to realize a some Composition Control target substantially, user's use is affected.Under this kind situation, cannot add nitrogen-containing alloy again, nitrogen will be transferred to enter.
Summary of the invention
Technical problem to be solved by this invention is: the shortcoming at above prior art exists, and propose a kind of 48MnV nitrogenous steel and add nitrogen technology,
The technical scheme that the present invention solves above technical problem is:
A kind of 48MnV nitrogenous steel comprises following composition: C:0.45～0.51% by weight percentage, Si:0.17～0.37%, Mn:1.00～1.20%, V:0.06～0.11%, Ti:0.000～0.025, Cr:0.05～0.25%, Mo:0.00～0.06%, Ni:0.00～0.06%, Cu:0.00～0.20%, N:0.080～0.0150%, P≤0.035%, S≤0.035%, O≤0.020%, Ceq:0.087～0.097%, surplus is Fe and inevitably is mingled with.
The 48MnV nitrogenous steel add nitrogen technology, carry out according to the following steps: the supplementary material examination → batching → electrosmelting → LF refining → VD degassing → feeding nitrification gold thread → calcium processing → quiet stirring → continuous casting → strand cooling check → blank examination → heating → de-scaling → rolling → cooling in heap → aligning → pickling → reconditioning → chamfered edge → inside and outside flaw detection → inspection after construction → packing indicates → weighs → put in storage;
In the feeding nitro-alloy line procedures, press N 0.0080～0.0150% control, target value 0.0110%, press calculated amount after the vacuum flow process in steel disposable feeding nitrogenized manganese line.
The technical scheme that the present invention further limits:
Aforesaid 48MnV nitrogenous steel add nitrogen technology, the nitrogenized manganese cored-wire composition that feeding nitrogenized manganese iron wire adopts require be: C≤1.0%, S≤0.03%, N:4.5～6.0%, P≤0.30%, Mn:75.0～80.0%, Si≤2.5, surplus are Fe and and inevitably are mingled with.Nitrogenized manganese cored-wire iron sheet quality≤180g/m, core opaque amount 〉=500g/m, every km joint number≤2.
Aforesaid 48MnV nitrogenous steel add nitrogen technology, electrosmelting: eaf tapping point carbon 〉=0.10%, P≤0.010%, the freeboard of ladle 660mm is guaranteed in T 〉=1640 ℃; Add slag charge and steel alloy: Si-Mn:9～12Kg in the tapping process in the ladle, compound middle aluminium: 3～4Kg, V-Fe:1～1.5Kg, lime: 5～6Kg, modification refining slag: 3～4Kg.
Aforesaid 48MnV nitrogenous steel add nitrogen technology, LF refining: refining time 〉=40min, process is added CaO according to the slag condition, uses SiAlCa or calcium carbide deoxidation, guarantees white slag 〉=30 minute.
Aforesaid 48MnV nitrogenous steel add nitrogen technology, in order to ensure oxygen content in steel≤20ppm, hydrogen richness≤3ppm, molten steel must carry out vacuum outgas at the VD stove to be handled;
Advance the VD reference temperature: continuous casting first stove: 1675～1695 ℃, connect and water stove: 1675～1685 ℃, advance the VD reference temperature and can adjust composition or intensification as arranging to return LF according to the adjustment of organization of production situation, can suitably adjust temperature;
VD composition %:C:0.46, Mn:0.90, Cr:0.13, Si:0.21, Alt:0.020～0.030 are entered in control;
Vacuum tightness＜1 millibar maintenance down, hold-time 10～15min, vacuum breaker promptly keep the quiet state that stirs.
Aforesaid 48MnV nitrogenous steel add nitrogen technology, feed nitrification gold thread → calcium processing → quiet stirring: according to target be worth according to the sample result and finely tune, feed the C line after adding TiFe, fed and to have fed the Al line immediately, feed the MnN line then: according to N content, 100m=26ppm N, 100m=0.037%Mn, stir the above feeding of 2min CaFe line: 80～120m, the back that finishes keeps the above feeding of the quiet 3min of stirring SFe line: feed quantity: 1m/t, get two sample analyses more than the quiet 3min of stirring, continue to keep quiet stirring, according to waiting sample result to continue fine setting, finely tune qualified after, get behind the finished product sample continuous casting on the bull ladle; The quiet process of stirring adds heat preserving agent 100～150kg according to temperature.
The effect of each element:
(1) C carbon in all elements improves the ability maximum of intensity, carbon is approximately 5 times of silicon to the strengthening effect of steel, 9 times and 18 times of manganese of chromium, think and guarantee that the 48MnV steel has enough intensity, hardness, performances such as antifatigue, must contain quite high carbon content in the steel, so carbon content is controlled at 0.45～0.51%.
(2) Si solution strengthening, precipitation strength and refined crystalline strengthening can both make the dislocation moving difficulty, can effectively improve the intensity of steel, and silicon also easily reduces the plasticity and the toughness of steel, so Si content is controlled at 0.17～0.37%.
(3) Mn, Cr play strengthening effect to steel, so content is controlled at Mn 1.00～1.20%, and Cr0.05～0.25%.
(4) V, T all are strong carbide forming elements, and the effect of precipitation strength and refined crystalline strengthening is arranged in steel, so content is controlled at V 0.06～0.11%, Ti 0.000～0.025.
(5) N and V, Nb, Ti are compound, play the refined crystalline strengthening effect, so content is controlled at N 0.080～0.0150%.
Advantage of the present invention is: the present invention changes that to add nitrogen alloying before the vacuum be to add nitrogen alloying after the vacuum, changed the preceding nitrogen alloying of metallurgical boundary vacuum, finely tune the technical process of nitrogen after the vacuum again, can make the 48MnV nitrogenous steel obtain better comprehensive mechanical property, improve intensity and toughness.
Embodiment
Embodiment one
Present embodiment is a kind of 48MnV nitrogenous steel, comprises following composition: C:0.45% by weight percentage, Si:0.17%, Mn:1.00%, V:0.06%, Cr:0.05%, Mo:0.016%, Ni:0.01%, Cu:0.02%, N:0.080%, P:0.005%, S:0.015%, O:0.010%, Ceq:0.087%, surplus is Fe and inevitably is mingled with.
The 48MnV nitrogenous steel add nitrogen technology, carry out according to the following steps: the supplementary material examination → batching → electrosmelting → LF refining → VD degassing → feeding nitrification gold thread → calcium processing → quiet stirring → continuous casting → strand cooling check → blank examination → heating → de-scaling → rolling → cooling in heap → aligning → pickling → reconditioning → chamfered edge → inside and outside flaw detection → inspection after construction → packing indicates → weighs → put in storage;
In the feeding nitro-alloy line procedures, controlled target value 0.0110%, by calculated amount after the vacuum flow process in steel disposable feeding 239m nitrogenized manganese line.
The nitrogenized manganese cored-wire composition that feeding nitrogenized manganese iron wire adopts requires:
Table 1
The nitrogenized manganese cored wire technology requires:
Table 2
Actual contain Mn75% with the heavy 500g of the every ground rice of nitrogenized manganese line, nitrogenous 5%, reserve in the LF station and to add the nitrogenized manganese line and increase the Mn amount.
The actual production process major control is as follows:
EAF: tap is allocated molten iron 40t into for the 100t electric furnace, with addition of the high-quality steel scrap.New new three stoves of stove, newly build preceding 3 stoves of steel and must not produce this steel grade.Eaf tapping point carbon 〉=0.10%, P≤0.010%, the freeboard of ladle 660mm is guaranteed in T 〉=1640 ℃.Add slag charge and alloy Kg/t steel: Si-Mn:9Kg in the tapping process in the ladle, compound middle aluminium: 3Kg, V-Fe:1Kg, lime: 5Kg, modification refining slag: 3Kg.
LF: more than refining time 〉=40min, process is added CaO according to the slag condition, uses SiAlCa, calcium carbide deoxidation, guarantees white slag 〉=30 minute.
VD: advance the VD reference temperature, continuous casting first stove: 1675 ℃, connect and water stove: 1675 ℃.Annotate: advancing the VD reference temperature can adjust composition or intensification as arranging to return LF according to the adjustment of organization of production situation, can suitably adjust temperature; Guarantee the omnidistance Alt of refining 〉=more than 0.020%; VD composition %:C:0.46, Mn:0.90, Cr:0.13, Si:0.21, Alt:0.020 are advanced in control; Vacuum tightness＜1 millibar maintenance down, hold-time 10min, vacuum breaker promptly keep the quiet state that stirs; Vacuum breaker is got the full composition of lollipop sample analysis, uses the nitrogen pick-up of MnN line.
Line feeding is grasped: according to target be worth according to the sample result and finely tune, feed the C line after adding TiFe, fed and to have fed the Al line immediately, feed the MnN line then (according to N content, 100m=26ppm N, 100m=0.037%Mn), stir the above feeding of 2min CaFe line: 80m, finishing, (feed quantity: 1m/t according to molten steel reality [S], gets two sample analyses to the above feeding of the quiet 3min of stirring of back maintenance SFe line more than the quiet 3min of stirring, continue to keep quiet stirring, according to waiting sample result to continue fine setting, finely tune qualified after, get behind the finished product sample continuous casting on the bull ladle; The quiet process of stirring adds heat preserving agent 100kg according to temperature.
The vacuum out-station temperature: the bull ladle reference temperature (℃) continuous casting first stove: 1560, connect and water stove: 1550; VD fine setting composition can allow to return LF adjustment or intensification according to the organization of production situation; T liquid=1490 ℃, middle bag storing time meets the Technology rules requirement of electric furnace factory, best superheating temperature: 15 ℃; CC: continuous casting becomes the 320mm*480mm bloom.
Embodiment two
Present embodiment is a kind of 48MnV nitrogenous steel, comprises following composition: C:0.49% by weight percentage, Si:0.25%, Mn:1.10%, V:0.09%, Ti:0.015%, Cr:0.15%, Mo:0.04%, Ni:0.04%, Cu:0.10%, N:0.010%, P:0.025%, S:0.020%, O:0.010%, Ceq:0.091%, surplus is Fe and inevitably is mingled with.
The 48MnV nitrogenous steel add nitrogen technology, carry out according to the following steps: the supplementary material examination → batching → electrosmelting → LF refining → VD degassing → feeding nitrification gold thread → calcium processing → quiet stirring → continuous casting → strand cooling check → blank examination → heating → de-scaling → rolling → cooling in heap → aligning → pickling → reconditioning → chamfered edge → inside and outside flaw detection → inspection after construction → packing indicates → weighs → put in storage;
In the feeding nitro-alloy line procedures, controlled target value 0.0110%, by calculated amount after the vacuum flow process in steel disposable feeding 239m nitrogenized manganese line.
The nitrogenized manganese cored-wire composition that feeding nitrogenized manganese iron wire adopts requires:
Table 3
The nitrogenized manganese cored wire technology requires:
Table 4
Actual contain Mn75% with the heavy 500g of the every ground rice of nitrogenized manganese line, nitrogenous 5%, reserve in the LF station and to add the nitrogenized manganese line and increase the Mn amount.
The actual production process major control is as follows:
EAF: tap is allocated molten iron 40t into for the 100t electric furnace, with addition of the high-quality steel scrap.New new three stoves of stove, newly build preceding 3 stoves of steel and must not produce this steel grade.Eaf tapping point carbon 〉=0.10%, P≤0.010%, the freeboard of ladle 660mm is guaranteed in T 〉=1640 ℃.Add slag charge and alloy Kg/t steel: Si-Mn:10Kg in the tapping process in the ladle, compound middle aluminium: 3.5Kg, V-Fe:1.2Kg, lime: 5.5Kg, modification refining slag: 3.5Kg.
LF: more than refining time 〉=40min, process is added CaO according to the slag condition, uses SiAlCa, calcium carbide deoxidation, guarantees white slag 〉=30 minute.
VD: advance the VD reference temperature, continuous casting first stove: 1680 ℃, connect and water stove: 1679 ℃.Annotate: advancing the VD reference temperature can adjust composition or intensification as arranging to return LF according to the adjustment of organization of production situation, can suitably adjust temperature; Guarantee the omnidistance Alt of refining 〉=more than 0.020%; VD composition %:C:0.46, Mn:0.90, Cr:0.13, Si:0.21, Alt:0.030 are advanced in control; Vacuum tightness＜1 millibar maintenance down, hold-time 12min, vacuum breaker promptly keep the quiet state that stirs; Vacuum breaker is got the full composition of lollipop sample analysis, uses the nitrogen pick-up of MnN line.
Line feeding is grasped: according to target be worth according to the sample result and finely tune, feed the C line after adding TiFe, fed and to have fed the Al line immediately, feed the MnN line then (according to N content, 100m=26ppm N, 100m=0.037%Mn), stir the above feeding of 2min CaFe line: 100m, finishing, (feed quantity: 1m/t according to molten steel reality [S], gets two sample analyses to the above feeding of the quiet 3min of stirring of back maintenance SFe line more than the quiet 3min of stirring, continue to keep quiet stirring, according to waiting sample result to continue fine setting, finely tune qualified after, get behind the finished product sample continuous casting on the bull ladle; The quiet process of stirring adds heat preserving agent 120kg according to temperature.
The vacuum out-station temperature: the bull ladle reference temperature (℃) continuous casting first stove: 1565, connect and water stove: 1555; VD fine setting composition can allow to return LF adjustment or intensification according to the organization of production situation; T liquid=1490 ℃, middle bag storing time meets the Technology rules requirement of electric furnace factory, best superheating temperature: 20 ℃; CC: continuous casting becomes the 320mm*480mm bloom.
Embodiment three
Present embodiment is a kind of 48MnV nitrogenous steel, comprises following composition: C:0.51% by weight percentage, Si:0.37%, Mn:1.20%, V:0.11%, Ti:0.025, Cr:0.25%, Mo:0.06%, Ni:0.06%, Cu:0.20%, N:0.0150%, P:0.035%, S:0.035%, O:0.020%, Ceq:0.097%, surplus is Fe and inevitably is mingled with.
The 48MnV nitrogenous steel add nitrogen technology, carry out according to the following steps: the supplementary material examination → batching → electrosmelting → LF refining → VD degassing → feeding nitrification gold thread → calcium processing → quiet stirring → continuous casting → strand cooling check → blank examination → heating → de-scaling → rolling → cooling in heap → aligning → pickling → reconditioning → chamfered edge → inside and outside flaw detection → inspection after construction → packing indicates → weighs → put in storage;
In the feeding nitro-alloy line procedures, controlled target value 0.0110%, by calculated amount after the vacuum flow process in steel disposable feeding 239m nitrogenized manganese line.
The nitrogenized manganese cored-wire composition that feeding nitrogenized manganese iron wire adopts requires:
Table 5
The nitrogenized manganese cored wire technology requires:
Table 6
Actual contain Mn75% with the heavy 500g of the every ground rice of nitrogenized manganese line, nitrogenous 5%, reserve in the LF station and to add the nitrogenized manganese line and increase the Mn amount.
The actual production process major control is as follows:
EAF: tap is allocated molten iron 40t into for the 100t electric furnace, with addition of the high-quality steel scrap.New new three stoves of stove, newly build preceding 3 stoves of steel and must not produce this steel grade.Eaf tapping point carbon 0.10%, P≤0.010%, the freeboard of ladle 660mm is guaranteed in T 〉=1640 ℃.Add slag charge and alloy Kg/t steel: Si-Mn:12Kg in the tapping process in the ladle, compound middle aluminium: 4Kg, V-Fe:1.5Kg, lime: 6Kg, modification refining slag: 4Kg.
LF: more than refining time 〉=40min, process is added CaO according to the slag condition, uses SiAlCa, calcium carbide deoxidation, guarantees white slag 〉=30 minute.
VD: advance the VD reference temperature, continuous casting first stove: 1695 ℃, connect and water stove: 1685 ℃.Annotate: advancing the VD reference temperature can adjust composition or intensification as arranging to return LF according to the adjustment of organization of production situation, can suitably adjust temperature; Guarantee the omnidistance Alt of refining 〉=more than 0.020%; VD composition %:C:0.46, Mn:0.90, Cr:0.13, Si:0.21, Alt:0.020-0.030 are advanced in control; Vacuum tightness＜1 millibar maintenance down, hold-time 15min, vacuum breaker promptly keep the quiet state that stirs; Vacuum breaker is got the full composition of lollipop sample analysis, uses the nitrogen pick-up of MnN line.
Line feeding is grasped: according to target be worth according to the sample result and finely tune, feed the C line after adding TiFe, fed and to have fed the Al line immediately, feed the MnN line then (according to N content, 100m=26ppm N, 100m=0.037%Mn), stir the above feeding of 2min CaFe line: 120m, finishing, (feed quantity: 1m/t according to molten steel reality [S], gets two sample analyses to the above feeding of the quiet 3min of stirring of back maintenance SFe line more than the quiet 3min of stirring, continue to keep quiet stirring, according to waiting sample result to continue fine setting, finely tune qualified after, get behind the finished product sample continuous casting on the bull ladle; The quiet process of stirring adds heat preserving agent 150kg according to temperature.
The vacuum out-station temperature: the bull ladle reference temperature (℃) continuous casting first stove: 1570, connect and water stove: 1560; VD fine setting composition can allow to return LF adjustment or intensification according to the organization of production situation; T liquid=1490 ℃, middle bag storing time meets the Technology rules requirement of electric furnace factory, best superheating temperature: 25 ℃; CC: continuous casting becomes the 320mm*480mm bloom.
The present invention can also have other embodiment, and the technical scheme that equal replacement of all employings or equivalent transformation form all drops within the scope of protection of present invention.
Claims (8)
1. 48MnV nitrogenous steel is characterized in that: comprise following composition by weight percentage:
C:0.45～0.51%, Si:0.17～0.37%, Mn:1.00～1.20%, V:0.06～0.11%, Ti:0.000～0.025, Cr:0.05～0.25%, Mo:0.00～0.06%, Ni:0.00～0.06%, Cu:0.00～0.20%, N:0.080～0.0150%, P≤0.035%, S≤0.035%, O≤0.020%, Ceq:0.087～0.097%, surplus are Fe and inevitably are mingled with.
According to claim 1 the 48MnV nitrogenous steel add nitrogen technology, it is characterized in that: carry out according to the following steps:
Supplementary material examination → batching → electrosmelting → LF refining → VD the degassing → feeding nitrification gold thread → calcium processing → quiet stirring → continuous casting → strand cooling check → blank examination → heating → de-scaling → rolling → cooling in heap → aligning → pickling → reconditioning → chamfered edge → inside and outside flaw detection → inspection after construction → packing indicates → weighs → puts in storage;
In the described feeding nitro-alloy line procedures, press N 0.0080～0.0150% control, target value 0.0110%, by calculated amount after the vacuum flow process in steel disposable feeding nitrogenized manganese iron wire.
3. 48MnV nitrogenous steel as claimed in claim 2 add nitrogen technology, it is characterized in that: the nitrogenized manganese cored-wire composition requirement that feeding nitrogenized manganese iron wire adopts is: C≤1.0%, S≤0.03%, N:4.5～6.0%, P≤0.30%, Mn:75.0～80.0%, Si≤2.5, surplus is Fe and and inevitably is mingled with.
4. 48MnV nitrogenous steel as claimed in claim 3 add nitrogen technology, it is characterized in that: described nitrogenized manganese cored-wire iron sheet quality≤180g/m, core opaque amount 〉=500g/m, every km joint number≤2.
5. 48MnV nitrogenous steel as claimed in claim 2 add nitrogen technology, it is characterized in that: electrosmelting: eaf tapping point carbon 〉=0.10%, P≤0.010%, the freeboard of ladle 660mm is guaranteed in T 〉=1640 ℃; Add slag charge and steel alloy: Si-Mn:9～12Kg in the tapping process in the ladle, compound middle aluminium: 3～4Kg, V-Fe:1～1.5Kg, lime: 5～6Kg, modification refining slag: 3～4Kg.
6. 48MnV nitrogenous steel as claimed in claim 2 add nitrogen technology, it is characterized in that: LF refining: refining time 〉=40min, process is added CaO according to the slag condition, uses SiAlCa or calcium carbide deoxidation, guarantees white slag 〉=30 minute.
7. 48MnV nitrogenous steel as claimed in claim 2 add nitrogen technology, it is characterized in that: the VD degassing:
Advance the VD reference temperature: continuous casting first stove: 1675～1695 ℃, connect and water stove: 1675～1685 ℃; VD composition %:C:0.46, Mn:0.90, Cr:0.13, Si:0.21, Alt:0.020～0.030 are entered in control;
Vacuum tightness＜1 millibar maintenance down, hold-time 10～15min, vacuum breaker promptly keep the quiet state that stirs.
8. 48MnV nitrogenous steel as claimed in claim 2 add nitrogen technology, it is characterized in that: feeding nitrification gold thread → calcium processing → quiet stirring:
According to target be worth according to the sample result and finely tune, feed the C line after adding TiFe, fed and to have fed the Al line immediately, feed the MnN line then: according to N content, 100m=26ppm N, 100m=0.037%Mn stirs the above feeding of 2min CaFe line: 80～120m, the above feeding of the quiet 3min of stirring of back maintenance SFe line finishes: feed quantity: 1m/t, get two sample analyses more than the quiet 3min of stirring, continue to keep quiet stirring, according to waiting sample result to continue fine setting, finely tune qualified after, get behind the finished product sample continuous casting on the bull ladle; The quiet process of stirring adds heat preserving agent 100～150kg according to temperature.
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| CN114150217A (en) * | 2021-11-18 | 2022-03-08 | 南京钢铁股份有限公司 | High-purity non-quenched and tempered round steel and preparation method thereof |
| CN114875317A (en) * | 2022-04-28 | 2022-08-09 | 湖南华菱湘潭钢铁有限公司 | Production method of non-quenched and tempered steel for motor rotating shaft |
| CN115522118A (en) * | 2021-06-25 | 2022-12-27 | 宝山钢铁股份有限公司 | Medium-carbon nitrogen-containing steel and slab continuous casting production method thereof |
| CN116005070A (en) * | 2022-12-23 | 2023-04-25 | 建龙北满特殊钢有限责任公司 | Production method of non-quenched and tempered steel with nitrogen content adjusted after vacuum |
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