CN101956128B - 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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- CN101956128B CN101956128B CN2010105270333A CN201010527033A CN101956128B CN 101956128 B CN101956128 B CN 101956128B CN 2010105270333 A CN2010105270333 A CN 2010105270333A CN 201010527033 A CN201010527033 A CN 201010527033A CN 101956128 B CN101956128 B CN 101956128B
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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 representes cast steel (prefix letter) to the ZG16Mn steel; 16/10000ths of among the 16Mn 16 expression carbon average content (massfraction); Mn representes 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 present invention provides a kind of and can enhance product performance, and realizes 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 process 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, selection smelting technology, further purify hot metal, melting period shifts to an earlier date the slag making dephosphorization; Submerged arc heats up, and low temperature dephosphorization, the thin slag decarburization oxidation work of high temperature are carried out in oxidation in earlier stage, and 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 the speed of degassing greater than air-breathing speed, temperature during greater than 1620 ℃ decarburized amount require gas, inclusion in the molten steel fully to be floated greater than 0.25%; Guarantee that carbon, phosphorus, temperature reach the condition of skimming synchronously, the temperature of skimming>=1650 ℃, P≤0.010, C=0.08-0.11%;
The 3rd step, skim before more than the pool boiling 5min, it is clean fast to skim, and adds 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, inserts Al 0.5Kg/t in the bag, 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 to cherry is red 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 rationally is prone to row, flexible to operation, can effectively enhance product performance, and realizes efficient, low consumption, high-quality and environmental protection production.
Embodiment
Below in conjunction with embodiment the present invention is further specified.
A kind of control method that improves ZG16Mn steel casting low temperature impact properties, its process 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, selection smelting technology, further purify hot metal, melting period shifts to an earlier date the slag making dephosphorization; Submerged arc heats up, and low temperature dephosphorization, the thin slag decarburization oxidation work of high temperature are carried out in oxidation in earlier stage, and 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 the speed of degassing greater than air-breathing speed, temperature during greater than 1620 ℃ decarburized amount require gas, inclusion in the molten steel fully to be floated greater than 0.25%; Guarantee that carbon, phosphorus, temperature reach the condition of skimming synchronously, the temperature of skimming>=1650 ℃, P≤0.010, C=0.08-0.11%;
The 3rd step, skim before more than the pool boiling 5min, it is clean fast to skim, and adds 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, inserts Al 0.5Kg/t in the bag, 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 to cherry is red 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 rationally is prone to row, flexible to operation, 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 process 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, selection smelting technology, further purify hot metal, melting period shifts to an earlier date the slag making dephosphorization; Submerged arc heats up, and low temperature dephosphorization, the thin slag decarburization oxidation work of high temperature are carried out in oxidation in earlier stage, and 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 the speed of degassing greater than air-breathing speed, temperature during greater than 1620 ℃ decarburized amount require gas, inclusion in the molten steel fully to be floated greater than 0.25%; Guarantee that carbon, phosphorus, temperature reach the condition of skimming synchronously, the temperature of skimming>=1650 ℃, P≤0.010, C=0.08-0.11%;
The 3rd step, skim before more than the pool boiling 5min, it is clean fast to skim, and adds 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, inserts Al 0.5kg/t in the bag, towards composite deoxidant 0.6kg/t, improves the form and the size of inclusion, for come-up creates conditions in the bag;
The 6th step, ladle baking to cherry is red 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. the control method of raising ZG16Mn steel casting low temperature impact properties as claimed in claim 1, it is characterized in that: the chemical composition of prepared 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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| CN100432263C (en) * | 2006-05-18 | 2008-11-12 | 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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