CN101597724B - Alloy structural steel and production method thereof - Google Patents
Alloy structural steel and production method thereof Download PDFInfo
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- CN101597724B CN101597724B CN2009101002709A CN200910100270A CN101597724B CN 101597724 B CN101597724 B CN 101597724B CN 2009101002709 A CN2009101002709 A CN 2009101002709A CN 200910100270 A CN200910100270 A CN 200910100270A CN 101597724 B CN101597724 B CN 101597724B
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Abstract
The invention discloses alloy structural steel and a production method thereof; wherein the alloy structural steel is applied to large ship rudder stocks and wind generating set motor shaft under a low temperature. The structural steel has components as follows in percentage by weight: 0.38-0.41% of carbon, 0.17-0.37% of silicon, 0.68-0.80% of manganese, 0.012% or less than 0.012% of phosphorus, 0.012% or less than 0.012% of sulphur, 1.05-1.20% of chrome, 0.20-0.30% of molybdenum, 0.30-0.40% of nickel, 0.20% or less than 0.20% of copper, 0.025-0.065% of aluminium, 0.025-0.065% of niobium; 0.01% or less than 0.01% of any one of tungsten, arsenic, tin, lead and titanium; the balance iron. The production method is as follows: (1) adding scrap steel into an electric arc furnace to melt in smelting process, then adding iron alloy into the electric arc furnace after oxidizing period smelting and reducing period smelting; (2) refining in an LF furnace, fine adjusting the components, making slag and deoxidizing, while injecting argon and stirring in the whole process; (3) degassing by a vacuum degassing furnace; (4) molding die with the shield of argon; (5) preserving heat; and (6) forging, and thermal refining. The alloy structural steel has the advantages of high fatigue resistance strength, and higher low-temperature impact toughness.
Description
Technical field
The present invention relates to a kind of structural alloy steel, especially a kind of structural alloy steel and production method thereof that under cold condition, is used for large ship rudder stock and wind power generating set motor shaft.
Background technology
Existing 42CrMo structural alloy steel is produced according to GB GB/T3077-1999, its main moiety count by weight percentage for: carbon 0.38～0.45%, silicon 0.17～0.37%, manganese 0.50～0.80%, molybdenum 0.15～0.25%, chromium 0.90～1.20%, phosphorus≤0.035%, sulphur≤0.035%, copper≤0.30%, surplus are iron.Adopt the technological process of production of electric arc furnace smelting, the refining of LF stove, vacuum outgas, die casting, and the forging process that matches with it, this structural alloy steel impelling strength AKV 〉=20J at normal temperatures.
Above structural alloy steel fatigue resistance is lower, be processed into product after, work-ing life is short, tensile strength at low temperatures and impelling strength are all not enough.
Summary of the invention
Technical problem to be solved by this invention provides the structural alloy steel of a kind of higher fatigue resistance, higher low-temperature impact toughness, and the production method of this structural alloy steel.
The present invention addresses the above problem the technical scheme that is adopted: the components based on weight percentage of this structure iron is calculated and is carbon 0.38～0.41%, silicon 0.17～0.37%, manganese 0.68～0.80%, phosphorus≤0.012%, sulphur≤0.012%, chromium 1.05～1.20%, molybdenum 0.20～0.30%, nickel 0.30～0.40%, copper≤0.20%, aluminium 0.025～0.065%, niobium 0.025～0.065%; Any one element in tungsten, arsenic, tin, lead, the titanium all≤0.01%; All the other are iron.
The production method concrete steps of this structure iron are
(1) in arc furnace smelting procedure, add scrap melting, after smelting by oxidation period, reduction period, add following iron alloy, by weight percentage:
Ferrosilicon: carbon≤0.01%, manganese≤0.4%, silicon 70～75%, aluminium≤1.0%, iron surplus
Ferromanganese: carbon≤2.3%, manganese 60～65%, silicon≤1.0%, iron surplus
Ferrochrome: carbon≤8.0%, chromium 60～65%, silicon≤3.0%, iron surplus
Electrolytic nickel: nickel 99.99%, impurity surplus
Molybdenum-iron: carbon≤0.75%, molybdenum 55～65%, silicon≤0.05%, iron surplus
Ferro-niobium: carbon≤0.05%, niobium 58～65%, silicon≤2.0%, aluminium≤2.5%, iron surplus
Aluminum steel: aluminium 97.0%, impurity surplus
Silico-calcium: silicon 45～50%, calcium 25～30%, iron surplus
Ferrosilicoaluminum: silicon 42～48%, aluminium 45～50%, iron surplus
(2) through the refining of LF stove, refining temperature is 1570 ℃～1650 ℃, composition fine setting, slag making deoxidation, and refining time＞40 minute, omnidistance Argon stirs, and makes Chemical Composition reach the component requirement of this steel grade;
(3) outgas with vacuum degassing furnace, degassing temperature is 1630 ℃～1650 ℃, vacuum tightness≤67 handkerchiefs, time＞10 minute of bleeding;
(4) under 1545 ℃～1555 ℃ temperature, carry out the argon shield die casting;
(5) take the insulation measure behind the ingot solidification, soaking time＞72 hour;
(6) by forge, modifier treatment, low-temperature impact toughness AKV＞37J when making this structure iron-40 ℃.
The present invention compared with prior art has following beneficial effect: 1, this steel grade has improved the content of phosphorus, sulphur, and the weight percent of phosphorus, sulphur≤0.012% has reduced the probability that inclusiones such as sulfide produce, and has improved the fatigue resistance of steel; 2, this steel grade has improved the content of chromium, helps improving the hardening capacity of steel in forging modulation process; 3, this steel grade has improved the content of molybdenum, helps improving the hardening capacity and the crystal grain thinning of steel; 4, in making processes, added ferro-niobium, the content of niobium is controlled at 0.025～0.06% (weight percent meter), can crystal grain thinning, improve the low-temperature impact toughness of steel; 5, in making processes, added electrolytic nickel, the content of nickel is controlled at 0.30～0.40% (weight percent meter), can improve the low-temperature impact toughness of steel; 6, this steel grade is controlled at 0.025～0.065% with the weight percent of aluminium, makes the autstenitic grain size of steel reach 5～8 grades.
To sum up, the present invention makes the low-temperature impact toughness AKV＞37J of this structural alloy steel in the time of-40 ℃ by preferred chemical ingredients, optimization production technology, is higher than existing structural alloy steel of the same race far away.
Embodiment
Sequence number 1～3 is the golden structure iron of three combinations of melting in the table, and its concrete composition is:
Concrete procedure of processing is
(1) in arc furnace smelting procedure, add scrap melting, after smelting by oxidation period, reduction period, add following iron alloy, by weight percentage:
Ferrosilicon: carbon≤0.01%, manganese≤0.4%, silicon 70～75%, aluminium≤1.0%, iron surplus
Ferromanganese: carbon≤2.3%, manganese 60～65%, silicon≤1.0%, iron surplus
Ferrochrome: carbon≤8.0%, chromium 60～65%, silicon≤3.0%, iron surplus
Electrolytic nickel: nickel 99.99%, impurity surplus
Molybdenum-iron: carbon≤0.75%, molybdenum 55～65%, silicon≤0.05%, iron surplus
Ferro-niobium: carbon≤0.05%, niobium 58～65%, silicon≤2.0%, aluminium≤2.5%, iron surplus
Aluminum steel: aluminium 97.0%, impurity surplus
Silico-calcium: silicon 45～50%, calcium 25～30%, iron surplus
Ferrosilicoaluminum: silicon 42～48%, aluminium 45～50%, iron surplus
Wherein present embodiment added at the reduction initial stage: ferrosilicon 1.5kg/ ton molten steel, ferromanganese 10kg/ ton molten steel, ferrochrome 20kg/ ton molten steel, electrolytic nickel 1.5kg/ ton molten steel, molybdenum-iron 3kg/ ton molten steel, silico-calcium 1kg/ ton molten steel, ferrosilicoaluminum 1kg/ ton molten steel.
(2) add ferro-niobium 0.5Kg/ ton molten steel, aluminum steel 1Kg/ ton molten steel then after, in the LF stove, carry out refining, refining temperature is 1570 ℃～1650 ℃, composition fine setting, slag making deoxidation, refining time＞40 minute,
Omnidistance Argon stirs, and makes Chemical Composition reach the component requirement of this steel grade;
(3) outgas with vacuum degassing furnace, degassing temperature is 1630 ℃～1650 ℃, vacuum tightness≤67 handkerchiefs, time＞10 minute of bleeding;
(4) under 1545 ℃～1555 ℃ temperature, carry out the argon shield die casting;
(5) take the insulation measure behind the ingot solidification, soaking time＞72 hour;
(6) by forge, modifier treatment, low-temperature impact toughness AKV＞37J when making this structure iron-40 ℃.
Claims (2)
1. structural alloy steel is characterized in that: the components based on weight percentage of this structure iron is calculated and is carbon 0.38～0.41%, silicon 0.17～0.37%, manganese 0.68～0.80%, phosphorus≤0.012%, sulphur≤0.012%, chromium 1.05～1.20%, molybdenum 0.20～0.30%, nickel 0.30～0.40%, copper≤0.20%, aluminium 0.025～0.065%, niobium 0.025～0.065%; Any one element in tungsten, arsenic, tin, lead, the titanium all≤0.01%; All the other are iron, low-temperature impact toughness AKV＞37J during this structure iron-40 ℃.
2. the production method of the described structural alloy steel of claim 1, it is characterized in that: concrete steps are
(1) in arc furnace smelting procedure, add scrap melting, after smelting by oxidation period, reduction period, add following iron alloy, by weight percentage:
Ferrosilicon: carbon≤0.01%, manganese≤0.4%, silicon 70～75%, aluminium≤1.0%, iron surplus
Ferromanganese: carbon≤2.3%, manganese 60～65%, silicon≤1.0%, iron surplus
Ferrochrome: carbon≤8.0%, chromium 60～65%, silicon≤3.0%, iron surplus
Electrolytic nickel: nickel 99.99%, impurity surplus
Molybdenum-iron: carbon≤0.75%, molybdenum 55～65%, silicon≤0.05%, iron surplus
Ferro-niobium: carbon≤0.05%, niobium 58～65%, silicon≤2.0%, aluminium≤2.5%, iron surplus
Aluminum steel: aluminium 97.0%, impurity surplus
Silico-calcium: silicon 45～50%, calcium 25～30%, iron surplus
Ferrosilicoaluminum: silicon 42～48%, aluminium 45～50%, iron surplus
(2) through the refining of LF stove, refining temperature is 1570 ℃～1650 ℃, composition fine setting, slag making deoxidation, and refining time＞40 minute, omnidistance Argon stirs, and makes Chemical Composition reach the component requirement of this steel grade;
(3) outgas with vacuum degassing furnace, degassing temperature is 1630 ℃～1650 ℃, vacuum tightness≤67 handkerchiefs, time＞10 minute of bleeding;
(4) under 1545 ℃～1555 ℃ temperature, carry out the argon shield die casting;
(5) take the insulation measure behind the ingot solidification, soaking time＞72 hour;
(6) by forge, modifier treatment, low-temperature impact toughness AKV＞37J when making this structure iron-40 ℃.
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| CN2009101002709A CN101597724B (en) | 2009-07-02 | 2009-07-02 | Alloy structural steel and production method thereof |
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| CN2009101002709A CN101597724B (en) | 2009-07-02 | 2009-07-02 | Alloy structural steel and production method thereof |
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| CN101597724B true CN101597724B (en) | 2011-01-05 |
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102029347B (en) * | 2010-12-29 | 2012-07-04 | 中原特钢股份有限公司 | Manufacturing method of gear shaft forge piece for offshore drilling platform |
| CN103614610B (en) * | 2013-11-28 | 2015-06-17 | 太原理工大学 | Method for preparing weather-resisting steel ingot |
| CN103741074B (en) * | 2013-12-23 | 2015-12-09 | 马鞍山市盈天钢业有限公司 | Effective weldless steel tube material of a kind of automobile half shaft and preparation method thereof |
| CN104726782A (en) * | 2013-12-23 | 2015-06-24 | 上海申江锻造有限公司 | Ultrahigh-strength low-alloy steel and manufacturing method thereof |
| CN104313485A (en) * | 2014-11-08 | 2015-01-28 | 江苏天舜金属材料集团有限公司 | Corrosion-resistant alloy material for prestressed steel strand and processing process of corrosion-resistant alloy material |
| CN104294170A (en) * | 2014-11-08 | 2015-01-21 | 江苏天舜金属材料集团有限公司 | Alloy material for high-strength steel pull rod and treatment technology thereof |
| CN105886943A (en) * | 2016-06-27 | 2016-08-24 | 肥西县碧涛建材有限公司 | Constructional steel and production process |
| CN106801199B (en) * | 2017-02-07 | 2018-07-24 | 和县隆盛精密机械有限公司 | A kind of mechanical arm high-strength alloy and preparation method thereof |
| CN107043896A (en) * | 2017-03-04 | 2017-08-15 | 蒋培丽 | Anticorrosion steel and its forging technology |
| CN106964693A (en) * | 2017-05-19 | 2017-07-21 | 江苏道勤新材料科技有限公司 | A kind of high intensity diel steel alloy |
| CN110387499A (en) * | 2019-06-27 | 2019-10-29 | 扬州市海纳源科技服务有限责任公司 | It is a kind of to mix low-alloyed metal material and preparation method |
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