CN101956128A - Control method for improving low-temperature impact property of ZG16Mn steel casting - Google Patents
Control method for improving low-temperature impact property of ZG16Mn steel casting Download PDFInfo
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- CN101956128A CN101956128A CN 201010527033 CN201010527033A CN101956128A CN 101956128 A CN101956128 A CN 101956128A CN 201010527033 CN201010527033 CN 201010527033 CN 201010527033 A CN201010527033 A CN 201010527033A CN 101956128 A CN101956128 A CN 101956128A
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Abstract
The invention relates to a control method for improving the low-temperature impact property of a ZG16Mn steel casting, which comprises the technical steps of: preparing furnace materials; selecting smelting technology; further purifying molten steel; statically boiling for more than 5 minutes before drossing; rapidly and clearly drossing; shortening the reduction time as much as possible and controlling the reduction time within 20 minutes; discharging from a steel tank, cleaning, drying, straightening and smoothening, and baking a steel ladle to cerise red; and simultaneously requiring no impurities on a steel ladle working layer so as to prepare the ZG16Mn steel finished product. By improving the low-temperature impact property of the ZG16Mn steel casting by combined arc furnace oxidation smelting, the control method has the advantages of reasonable and practicable technology, convenient and flexible operation, and capacities of effectively improving product performance and implementing high-efficiency, low-consumption, high-quality and environment-friendly production.
Description
Technical field
The invention belongs to technical field of smelting, relate to a kind of control method that adopts the raising ZG16Mn steel casting low temperature impact properties of built-up type electric arc stove oxidation style smelting.
Background technology
[ZG represents cast steel (prefix letter) to the ZG16Mn steel; 16/10000ths of among the 16Mn 16 expression carbon average content (massfraction); Mn represents the manganese element symbol] foundry goods is mainly container angle series product, and its special environment for use of container angle is the anti-atmosphere of requirement, sea-water corrosion etc., and low temperature impact properties is wanted high [40 ℃ of cold impact value Α simultaneously
Kv(J) 〉=and 21J], so require the container angle to have good anti-corrosion and low temperature impact properties.
Summary of the invention
In order to overcome the above-mentioned shortcoming of prior art, the invention provides a kind of can enhancing product performance, realize the control method of efficient, low consumption, the high-quality and raising ZG16Mn steel casting low temperature impact properties that environmental protection is produced.
The present invention solves the technological method that its technical problem adopts: a kind of control method of the ZG16Mn of raising steel casting low temperature impact properties, and its processing step is:
The first step, join and select furnace charge, furnace charge and proportioning thereof mainly are: steel scrap 40-45%, pig iron 8-12% and foundry returns 25-35%;
Second step, select smelting technology, further purify hot metal, melting period shifts to an earlier date the slag making dephosphorization, submerged arc heats up, the low temperature dephosphorization is carried out in oxidation in earlier stage, the thin slag decarburization oxidation work of high temperature, the oxygen pressure-controlled is between 0.6-0.8Mpa, guarantee more than the evenly fierce boiling 25min in molten bath, but forbid big boiling, control decarbonization rate well, guarantee that the speed of degassing is greater than air-breathing speed, temperature during greater than 1620 ℃ decarburized amount require greater than 0.25%, make the gas in the molten steel, inclusion fully floats, and guarantees carbon, phosphorus, temperature reaches the condition of skimming synchronously, the temperature of skimming 〉=1650 ℃, P≤0.010, C=0.08-0.11%;
The 3rd goes on foot, skims more than the preceding pool boiling 5min, it is clean fast to skim, add broken silicomanganese 2 Kg/t and the quick slagging of fritter shape lime immediately after taking 90% above oxidation sludge off, add the alloy deposition deoxidation then, bulk deoxidation and diffusive deoxidation are combined, after treating the slag flavescence, bleaching, fully stir molten steel, resampling is analyzed, and reduction period closes fire door and keeps malleation in the stove;
The 4th step, shorten the recovery time, the recovery time should be controlled within the 20min, reduces the air-breathing and opportunities for contamination of molten steel as far as possible;
The 5th step, tapping spout cleaning, dry, straight unimpeded, big mouthful of dell slag mixes and dashes during tapping, and Al 0.5Kg/t is inserted in the stokehold, and bag interpolation Al 0.5Kg/t towards composite deoxidant 0.6Kg/t, changes the form and the size of the inclusion that looses, for come-up creates conditions in the bag;
The 6th step, ladle baking is red to cherry required ladle working layer no-sundries simultaneously, in the molten steel after the 5th step handled is packed ladle into then, made ZG16Mn steel finished product.
The chemical composition of the ZG16Mn steel that makes through the present invention is: C:0.12-0.16, Mn:1.28-1.40, Si:0.25-0.45, Al:0.020-0.060, P≤0.025, S≤0.025, Cr≤0.20, Ni≤0.30, As≤0.10, Ce≤0.42.
The invention has the beneficial effects as follows: adopt built-up type electric arc stove oxidation style to smelt and improve ZG16Mn steel casting low temperature impact properties, its technology is easy row, flexible to operation rationally, can effectively enhance product performance, and realizes efficient, low consumption, high-quality and environmental protection production.
Embodiment
The present invention is further described below in conjunction with embodiment.
A kind of control method that improves ZG16Mn steel casting low temperature impact properties, its processing step is:
The first step, join and select furnace charge, furnace charge and proportioning thereof mainly are: steel scrap 40-45%, pig iron 8-12% and foundry returns 25-35%;
Second step, select smelting technology, further purify hot metal, melting period shifts to an earlier date the slag making dephosphorization, submerged arc heats up, the low temperature dephosphorization is carried out in oxidation in earlier stage, the thin slag decarburization oxidation work of high temperature, the oxygen pressure-controlled is between 0.6-0.8Mpa, guarantee more than the evenly fierce boiling 25min in molten bath, but forbid big boiling, control decarbonization rate well, guarantee that the speed of degassing is greater than air-breathing speed, temperature during greater than 1620 ℃ decarburized amount require greater than 0.25%, make the gas in the molten steel, inclusion fully floats, and guarantees carbon, phosphorus, temperature reaches the condition of skimming synchronously, the temperature of skimming 〉=1650 ℃, P≤0.010, C=0.08-0.11%;
The 3rd goes on foot, skims more than the preceding pool boiling 5min, it is clean fast to skim, add broken silicomanganese 2 Kg/t and the quick slagging of fritter shape lime immediately after taking 90% above oxidation sludge off, add the alloy deposition deoxidation then, bulk deoxidation and diffusive deoxidation are combined, after treating the slag flavescence, bleaching, fully stir molten steel, resampling is analyzed, and reduction period closes fire door and keeps malleation in the stove;
The 4th step, shorten the recovery time, the recovery time should be controlled within the 20min, reduces the air-breathing and opportunities for contamination of molten steel as far as possible;
The 5th step, tapping spout cleaning, dry, straight unimpeded, big mouthful of dell slag mixes and dashes during tapping, and Al 0.5Kg/t is inserted in the stokehold, and bag interpolation Al 0.5Kg/t towards composite deoxidant 0.6Kg/t, changes the form and the size of the inclusion that looses, for come-up creates conditions in the bag;
The 6th step, ladle baking is red to cherry required ladle working layer no-sundries simultaneously, in the molten steel after the 5th step handled is packed ladle into then, made ZG16Mn steel finished product.
The chemical composition of the ZG16Mn steel that makes through the present invention is: C:0.12-0.16, Mn:1.28-1.40, Si:0.25-0.45, Al:0.020-0.060, P≤0.025, S≤0.025, Cr≤0.20, Ni≤0.30, As≤0.10, Ce≤0.42.
The present invention adopts built-up type electric arc stove oxidation style to smelt to improve ZG16Mn steel casting low temperature impact properties, and its technology is easy row, flexible to operation rationally, can effectively enhance product performance, and realizes efficient, low consumption, high-quality and environmental protection production.
Claims (2)
1. control method that improves ZG16Mn steel casting low temperature impact properties is characterized in that processing step is:
The first step, join and select furnace charge, furnace charge and proportioning thereof mainly are: steel scrap 40-45%, pig iron 8-12% and foundry returns 25-35%;
Second step, select smelting technology, further purify hot metal, melting period shifts to an earlier date the slag making dephosphorization, submerged arc heats up, the low temperature dephosphorization is carried out in oxidation in earlier stage, the thin slag decarburization oxidation work of high temperature, the oxygen pressure-controlled is between 0.6-0.8Mpa, guarantee more than the evenly fierce boiling 25min in molten bath, but forbid big boiling, control decarbonization rate well, guarantee that the speed of degassing is greater than air-breathing speed, temperature during greater than 1620 ℃ decarburized amount require greater than 0.25%, make the gas in the molten steel, inclusion fully floats, and guarantees carbon, phosphorus, temperature reaches the condition of skimming synchronously, the temperature of skimming 〉=1650 ℃, P≤0.010, C=0.08-0.11%;
The 3rd goes on foot, skims more than the preceding pool boiling 5min, it is clean fast to skim, add broken silicomanganese 2 Kg/t and the quick slagging of fritter shape lime immediately after taking 90% above oxidation sludge off, add the alloy deposition deoxidation then, bulk deoxidation and diffusive deoxidation are combined, after treating the slag flavescence, bleaching, fully stir molten steel, resampling is analyzed, and reduction period closes fire door and keeps malleation in the stove;
The 4th step, shorten the recovery time, the recovery time should be controlled within the 20min, reduces the air-breathing and opportunities for contamination of molten steel as far as possible;
The 5th step, tapping spout cleaning, dry, straight unimpeded, big mouthful of dell slag mixes and dashes during tapping, and Al 0.5Kg/t is inserted in the stokehold, and bag interpolation Al 0.5Kg/t towards composite deoxidant 0.6Kg/t, changes the form and the size of the inclusion that looses, for come-up creates conditions in the bag;
The 6th step, ladle baking is red to cherry required ladle working layer no-sundries simultaneously, in the molten steel after the 5th step handled is packed ladle into then, made ZG16Mn steel finished product.
2. ZG16Mn steel casting as claimed in claim 1 is characterized in that: the chemical composition of ZG16Mn steel is: C:0.12-0.16, Mn:1.28-1.40, Si:0.25-0.45, Al:0.020-0.060, P≤0.025, S≤0.025, Cr≤0.20, Ni≤0.30, As≤0.10, Ce≤0.42.
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| CN2010105270333A CN101956128B (en) | 2010-11-01 | 2010-11-01 | Control method for improving low-temperature impact property of ZG16Mn steel casting |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105087856A (en) * | 2014-05-07 | 2015-11-25 | 镇江忆诺唯记忆合金有限公司 | Method for reducing oxygen content of molten steel smelted in acidic electric arc furnace through controlling static boiling time |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1038840A (en) * | 1988-06-18 | 1990-01-17 | 重庆大学 | Infrared process of smelting of low carbon, low-alloy steel by electric furnace |
| CN101074472A (en) * | 2006-05-18 | 2007-11-21 | 中国船舶重工集团公司第七二五研究所 | Ultrahigh-strength and high-toughness welded cast steel |
| CN101701276A (en) * | 2009-11-25 | 2010-05-05 | 天津钢铁集团有限公司 | Method for smelting steel round blank of pipeline with hydrogen sulfide corrosion resistance by convertor process |
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2010
- 2010-11-01 CN CN2010105270333A patent/CN101956128B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1038840A (en) * | 1988-06-18 | 1990-01-17 | 重庆大学 | Infrared process of smelting of low carbon, low-alloy steel by electric furnace |
| CN101074472A (en) * | 2006-05-18 | 2007-11-21 | 中国船舶重工集团公司第七二五研究所 | Ultrahigh-strength and high-toughness welded cast steel |
| CN101701276A (en) * | 2009-11-25 | 2010-05-05 | 天津钢铁集团有限公司 | Method for smelting steel round blank of pipeline with hydrogen sulfide corrosion resistance by convertor process |
Non-Patent Citations (1)
| Title |
|---|
| 《铸造技术》 20030731 余荣有等 集装箱角件用铸钢的低温冲击韧性探讨 第298页表3 1-2 第24卷, 第4期 2 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105087856A (en) * | 2014-05-07 | 2015-11-25 | 镇江忆诺唯记忆合金有限公司 | Method for reducing oxygen content of molten steel smelted in acidic electric arc furnace through controlling static boiling time |
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