CN103266219A - Ni-Cr alloy-containing steel ingot heating control process - Google Patents
Ni-Cr alloy-containing steel ingot heating control process Download PDFInfo
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- CN103266219A CN103266219A CN201310164281XA CN201310164281A CN103266219A CN 103266219 A CN103266219 A CN 103266219A CN 201310164281X A CN201310164281X A CN 201310164281XA CN 201310164281 A CN201310164281 A CN 201310164281A CN 103266219 A CN103266219 A CN 103266219A
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- steel ingot
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 54
- 239000010959 steel Substances 0.000 title claims abstract description 54
- 229910018487 Ni—Cr Inorganic materials 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 title claims abstract description 7
- 238000010438 heat treatment Methods 0.000 title abstract description 30
- 229910045601 alloy Inorganic materials 0.000 title abstract description 6
- 239000000956 alloy Substances 0.000 title abstract description 6
- 238000009413 insulation Methods 0.000 claims abstract description 21
- 238000002791 soaking Methods 0.000 claims abstract description 20
- 238000005516 engineering process Methods 0.000 claims description 12
- 229910000851 Alloy steel Inorganic materials 0.000 claims description 11
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 238000002485 combustion reaction Methods 0.000 claims description 3
- 230000001590 oxidative effect Effects 0.000 claims description 3
- 230000009466 transformation Effects 0.000 claims description 3
- 238000010079 rubber tapping Methods 0.000 claims description 2
- 230000007704 transition Effects 0.000 claims description 2
- 238000005096 rolling process Methods 0.000 abstract description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 238000001514 detection method Methods 0.000 abstract description 3
- 238000012797 qualification Methods 0.000 abstract description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 17
- 229910052742 iron Inorganic materials 0.000 description 7
- 230000035882 stress Effects 0.000 description 6
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 230000003647 oxidation Effects 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 3
- 208000037656 Respiratory Sounds Diseases 0.000 description 3
- 230000008646 thermal stress Effects 0.000 description 3
- 235000009508 confectionery Nutrition 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 229910000599 Cr alloy Inorganic materials 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
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Abstract
The invention relates to a Ni-Cr alloy-containing steel ingot heating control process, and belongs to the technical field of Ni-Cr alloy-containing steel ingot heating control. According to the present invention, the technical scheme is that a heating process is divided into a heating section and a thermal insulation soaking section; during the heating section, a heating rate is less than 100 DEG C/h when a temperature is less than 950 DEG C, and a heating rate is not limited when a temperature is more than 950 DEG C; if a steel ingot is a cold steel ingot, a steel original temperature is less than 100 DEG C, a heating rate is less than 50 DEG C/h when a temperature is less than 700 DEG C, and a heating rate is less than 100 DEG C/h when a temperature is 700-950 DEG C; the heating section adopts negative pressure operation, and a furnace pressure is -15 to -20 Pa; and the thermal insulation soaking section adopts micro positive pressure. The Ni-Cr alloy-containing steel ingot heating control process has the following beneficial effects that: quality of the internal of the steel plate is good; the steel ingot thermal breakage condition is substantially reduced; the flaw detection qualification rate is substantially increased; the steel plate surface quality is good; grinding scalping is substantially reduced; the reservation rolling thickness is reduced, and a finished product rate of the Ni-Cr alloy-containing steel ingot heating control process is increased by about 1-2% compared with a finished product rate of the ordinary steel ingot heating; and grinding scalping is reduced so as to reduce labor cost and shorten a production period.
Description
Technical field
What the present invention relates to a kind of Ni-Cr of containing alloy steel ingot adds thermal control technology, belongs to the heating control technology field that contains the Ni-Cr alloy steel ingot.
Background technology
Contain the Ni-Cr alloy steel ingot, Ni-Cr alloy content height, the scope single-element of Ni, Cr alloy content are generally all greater than more than 1%, and two kinds of alloying element additions are greater than more than 2.5%; Poor thermal conductivity, residual stress is big in the steel ingot, plasticity and intensity sharply descend under the high temperature, heat and improperly burst easily, in addition owing to contain the Ni height, the once oxidation iron sheet densification that steel ingot when heating surface forms, difficult drop-off when rolling, surface of steel plate are easy to generate defectives such as load mould, iron sheet are pressed into, for guaranteeing surface quality, have to stay certain thickness surplus when rolling, carry out the surface of steel plate reconditioning or the processing that strips off the skin for follow-up, because the steel plate reconditioning quality is big, production cycle is long, production cost increases, and is difficult to delivery date guarantee etc., has influenced the production of such steel.The stress of steel ingot inside mainly comprises two aspects, and one is the thermal stresses that expanding with heat and contract with cold in the heating and cooling process causes, when the steel ingot ingot shape is bigger, when the cross section is thicker, if it is improper to heat up, poor thermal conductivity will be aggravated this thermal stresses.Another is the structural stress in steel ingot heating process austenite phase transformation district, and these two kinds of stress are stack mutually often, makes surface of steel ingot and the inner stress field that produces complexity.The iron scale main component that the steel ingot heating surface produces is wustite (FeO), magnetite (Fe
3O
4) and rhombohedral iron ore (Fe
2O
3) different and different along with the type of steel and heating condition of the relative proportion of these phases.And a distinguishing feature that contains the Ni-Cr steel is exactly, the oxide film that Ni forms is comparatively fine and close, difficult drop-off, in addition, when high temperature, S in Ni and the furnace gas reacts and forms the lower NiS reticulattion of fusing point, melt and destroyed the protective membrane that steel ingot forms at a lower temperature, thereby aggravated the diffusion of oxygen in steel, the oxidation aggravation, iron sheet viscosity increases, and this is that it and other ordinary steel are distinguished significantly; How controlling the heating that contains the Ni-Cr alloy steel ingot, guarantee steel ingot internal soundness and surface quality, is this area problem demanding prompt solution.
Summary of the invention
What the object of the invention provided a kind of Ni-Cr of containing alloy steel ingot adds thermal control technology, according to steel ingot specification difference, adopt different heating cycles, when making it to satisfy the steel ingot internal soundness and require and help the improvement of surface quality, solve the problems referred to above that exist in the background technology.
Technical scheme of the present invention is: a kind of Ni-Cr of containing alloy steel ingot add thermal control technology, heat-processed is divided into heat up section and insulation soaking zone, in the section that heats up, below 950 ℃, heat-up rate＜100 ℃/h; Heat-up rate is not limit more than 950 ℃; If cold steel ingot, steel ingot original temperature＜100 ℃, heat-up rate below 700 ℃＜50 ℃/h, heat-up rate between 700-950 ℃＜100 ℃/h; The section that heats up adopts negative-pressure operation, and furnace pressure adopts pressure-fired for negative 15-20Pa, insulation soaking zone; In the time of 600-700 ℃, be incubated 2-3 hour, reduce thermal stresses; In the heat temperature raising process, at steel grade phase transition temperature point one insulation platform is set, make it to take place abundant phase transformation, reduce the structural stress that produces in the heat-processed, prevent crackle.
Described insulation platform is 900-950 ℃.
Air and combustion medium (Sweet natural gas, the heavy oil) ratio of heating are: the section that heats up is 10:1, and the insulation soaking zone is 7.5-8:1; The section that heats up adopts oxidizing atmosphere, and the insulation soaking zone adopts weak reducing atmosphere.
Utilize principle of expanding with heat and contracting with cold, simultaneously for the follow-up rolling easier iron sheet that comes off, before the tapping of insulation soaking zone 1-2 hour intensification 20-30 ℃.
The control burner length of flame does not allow to be sprayed onto on the steel ingot, in order to avoid the aggravation oxidation.
Beneficial effect of the present invention: the steel plate internal soundness is good, and the steel ingot heating bursts situation and descends significantly, and flaw detection qualification rate increases substantially, and plate surface quality is good, and the reconditioning amount of stripping off the skin significantly reduces; Because rolling reservation thickness reduces, lumber recovery improves about 1%-2% than common heating steel ingot; Because the reconditioning amount of stripping off the skin reduces, and has reduced labor cost, has shortened the production cycle.
Description of drawings
Accompanying drawing 1 is Ni-Cr steel ingot heating curve of the present invention;
Accompanying drawing 2 is the Ni-Cr steel ingot heating curve of a specific embodiment of the present invention.
Embodiment
The present invention will be further described by the following examples.
With reference to accompanying drawing 1, according to steel ingot ingot shape specification, heating curve is: 600-700 ℃, i.e. and h1 hour (1.5min/cm) of soaking insulation during the T1 temperature, 900-950 ℃ is h3 hour (2min/cm) of T2 soaking insulation, heat-up rate below 950 ℃＜100 ℃/h, heat-up rate is not limit more than 950 ℃, if cold steel ingot (steel ingot original temperature＜100 ℃), and heat-up rate below 700 ℃＜50 ℃/h, heat-up rate＜100 ℃ (700-950) ℃/h
In an embodiment, steel grade NVE690/Z35, chemical ingredients C:0.14%, Si:0.35%, Mn:1.10%, P:0.012%, S:0.002%, Ni:1.55%, Cr:1.45%, Mo:0.53%, Nb:0.020%, V:0.045%, the full aluminium of TAl(): 0.045%, surplus is Fe and unavoidable impurities.Steel ingot is 35 tons of ingot shapes, heats at soaking pit, and is specific as follows:
1. about 700 ℃, soaking is incubated 1 hour, and 950 ℃ of soaking are incubated 2 hours, 40 ℃/h of heat-up rate below 950 ℃, and 100 ℃/h of heat-up rate specifically sees accompanying drawing 2 more than 950 ℃;
2. the section that heats up adopts a negative pressure to burn a steel, and furnace pressure be-20Pa, insulation soaking zone employing pressure-fired, and furnace pressure is 5Pa;
3. the section that heats up adopts oxidizing atmosphere, and air and combustion medium Sweet natural gas ratio intensification section are 10:1, and the insulation soaking zone adopts weak reducing atmosphere, and the insulation soaking zone is 7.5:1.
4. control the burner length of flame, do not allow to be sprayed onto on the steel ingot, in order to avoid the aggravation oxidation.
5. steel ingot is tapped and was improved 20 ℃ of Heating temperatures in preceding 1 hour, be beneficial to steel plate follow-up when rolling iron scale come off.
Steel plate rolling thickness is 152.4mm, adopt above-mentioned technology heating, plate surface quality is good, only have under the artificial reconditioning of small number of regions and get final product, do not see defectives such as crackle, load mould, the control of thickness surplus is reduced to 3-4mm by original 7-8mm, and lumber recovery improves 2%, steel plate inspection shows that inside do not see crackle, and the flaw detection rank can be closed GB4730 I level.
Claims (4)
- One kind contain the Ni-Cr alloy steel ingot add thermal control technology, it is characterized in that: heat-processed is divided into heat up section and insulation soaking zone, in the section that heats up, below 950 ℃, heat-up rate＜100 ℃/h; Heat-up rate is not limit more than 950 ℃; If cold steel ingot, steel ingot original temperature＜100 ℃, heat-up rate below 700 ℃＜50 ℃/h, heat-up rate between 700-950 ℃＜100 ℃/h; The section that heats up adopts negative-pressure operation, and furnace pressure adopts pressure-fired for negative 15-20Pa, insulation soaking zone; In the time of 600-700 ℃, be incubated 2-3 hour in the heat temperature raising process, at steel grade phase transition temperature point one insulation platform is set, make it to take place abundant phase transformation, reduce the structural stress that produces in the heat-processed.
- A kind of Ni-Cr of containing alloy steel ingot according to claim 1 add thermal control technology, it is characterized in that: described insulation platform is 900-950 ℃.
- A kind of Ni-Cr of containing alloy steel ingot according to claim 1 and 2 add thermal control technology, it is characterized in that the air and the combustion medium ratio that heat are:The section that heats up is 10:1, and the insulation soaking zone is 7.5-8:1; The section that heats up adopts oxidizing atmosphere, and the insulation soaking zone adopts weak reducing atmosphere.
- A kind of Ni-Cr of containing alloy steel ingot according to claim 1 and 2 add thermal control technology, it is characterized in that: before the tapping of insulation soaking zone 1-2 hour intensification 20-30 ℃.
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| CN201310164281.XA CN103266219B (en) | 2013-05-07 | 2013-05-07 | Ni-Cr alloy-containing steel ingot heating control process |
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| CN201310164281.XA CN103266219B (en) | 2013-05-07 | 2013-05-07 | Ni-Cr alloy-containing steel ingot heating control process |
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| CN103266219A true CN103266219A (en) | 2013-08-28 |
| CN103266219B CN103266219B (en) | 2015-04-15 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105803173A (en) * | 2016-03-31 | 2016-07-27 | 舞阳钢铁有限责任公司 | Production method for removing scale on surface of Ni-containing steel |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108396133A (en) * | 2017-02-05 | 2018-08-14 | 鞍钢股份有限公司 | A kind of heating means of nickelic steel ingot |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07238343A (en) * | 1994-02-25 | 1995-09-12 | Kobe Steel Ltd | Free cutting carburizing steel and heat treatment therefor before machining |
| CN1827796A (en) * | 2005-02-28 | 2006-09-06 | 宝山钢铁股份有限公司 | Soaking method for low-carbon high-chromium alloy steel ingot |
| CN1986090A (en) * | 2006-12-15 | 2007-06-27 | 鞍山市第三轧钢有限公司 | Rolling process of brake steel splint for speed reducer in large railway vehicle |
| CN102676766A (en) * | 2012-06-05 | 2012-09-19 | 米云霞 | Thermal treatment method for improving low-temperature impact toughness of austenite-ferrite stainless steel |
| CN202482359U (en) * | 2012-01-29 | 2012-10-10 | 湘潭华宇电炉制造有限公司 | Tempering furnace with fume exhausting function |
-
2013
- 2013-05-07 CN CN201310164281.XA patent/CN103266219B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07238343A (en) * | 1994-02-25 | 1995-09-12 | Kobe Steel Ltd | Free cutting carburizing steel and heat treatment therefor before machining |
| CN1827796A (en) * | 2005-02-28 | 2006-09-06 | 宝山钢铁股份有限公司 | Soaking method for low-carbon high-chromium alloy steel ingot |
| CN1986090A (en) * | 2006-12-15 | 2007-06-27 | 鞍山市第三轧钢有限公司 | Rolling process of brake steel splint for speed reducer in large railway vehicle |
| CN202482359U (en) * | 2012-01-29 | 2012-10-10 | 湘潭华宇电炉制造有限公司 | Tempering furnace with fume exhausting function |
| CN102676766A (en) * | 2012-06-05 | 2012-09-19 | 米云霞 | Thermal treatment method for improving low-temperature impact toughness of austenite-ferrite stainless steel |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105803173A (en) * | 2016-03-31 | 2016-07-27 | 舞阳钢铁有限责任公司 | Production method for removing scale on surface of Ni-containing steel |
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