CN102653834A - Circular chain steel and production method thereof - Google Patents
Circular chain steel and production method thereof Download PDFInfo
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- CN102653834A CN102653834A CN2012101351186A CN201210135118A CN102653834A CN 102653834 A CN102653834 A CN 102653834A CN 2012101351186 A CN2012101351186 A CN 2012101351186A CN 201210135118 A CN201210135118 A CN 201210135118A CN 102653834 A CN102653834 A CN 102653834A
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Abstract
The invention relates to a kind of circular chain steel and a production method thereof. The circular chain steel comprises the following compositions in percentage by weight: 0.20-0.25% of C, 0.42-0.55% of Si, 1.05-1.60% of Mn, less than or equal to 0.040% of P, less than or equal to 0.040% of S, less than or equal to 0.52% of Ceq, and the balance of Fe and inevitable impurities. The production method comprises the steps of smelting; continuous casting and heating; rolling; water-controlled cooling; piecewise cutting; air cooling; and cutting to length, and packaging for standby. According to the invention, the defect of welding cracks caused by high manganese content is eliminated; the circular chain steel is loose in P, S control, and easy to process and make; and because of adopting controlled cooling after rolling, the yield strength of the steel is increased to 380Mpa and above, and the tensile strength is greater than 580MPa.
Description
Technical field
The present invention relates to ferrous materials and working method thereof, specifically belong to the method for a kind of annular chains with steel and production thereof.
Background technology
Annular chains mainly is used in the binding object, and like handlings such as wood, shaped steel, it is had relatively high expectations with the ys of steel to annular chains, according to the development of technology and the requirement of security, requires its ys at present more than 380MPa.
In the prior art, annular chains is a kind of with steel to be to adopt by the 20Mn2 trade mark steel among the GB/T3077, and its technology is electricity/converter+LF refinery practice, does the thermal treatment check.The deficiency of its existence: the one, P, S require too strict; The 2nd, operational path is long, promptly adopt electricity/converter smelting after, also need increase the refining procedure cost through the LF refining furnace; The 3rd, because it is Mn content is higher, unfavorable to the welding property in the chain making.
The component of 20Mn2 trade mark steel and weight content tabulation
Technical process is: electricity/converter smelting → refining → continuous casting → heating → rolling → naturally cooling → shearing → packing (no controlled chilling).
Second kind is with the chain steel of among the round steel standard JIS G3105-2004 composition of chain steel, performance defined being produced according to Japanese chain.The deficiency of its existence makes: mechanical property is on the low side, promptly ys is not done requirement, and tensile strength only requires 490MPa, and it can not satisfy present requirement.
Japan's chain is tabulated with component and the weight content to chain steel among the round steel standard JIS G3105-2004
Technical process: electricity/converter smelting → continuous casting → heating → rolling → naturally cooling → shearing → packing (no controlled chilling).
Summary of the invention
The problem that the present invention will solve is: it is too strict to overcome present P with steel, S content; Tap to tap time is long; Because the higher and easy generation welding crack of Mn content, or mechanical property is low, the deficiency that can not meet the demands; Provide a kind of P, S control loose, can not produce welding crack and can guarantee its ys in 380MPa and above, tensile strength greater than the annular chains of 580MPa method with steel and production thereof.
Realize the measure of above-mentioned purpose:
A kind of annular chains is used steel, its component and weight percent content: C:0.20～0.25%, and Si:0.42～0.55%, Mn: 1.05～1.60%, P≤0.040%, S≤0.040%, Ceq≤0.52%, all the other are Fe and unavoidable impurities.
Produce the method for a kind of annular chains, its step with steel:
1) smelt: P≤0.12% in the control molten steel, S≤0.04%, and stay slag operation, the basicity of control slag is 2.8～3.5; Argon blowing time was not less than 4 minutes;
2) carry out continuous casting and heating, heating and temperature control is being not less than 1280 ℃, and be 60～90 minutes heat-up time; The component of strand and weight percent content: C:0.20～0.25%, Si:0.42～0.55%, Mn: 1.05～1.60%, P≤0.040%, S≤0.040%, Ceq≤0.52%, all the other are Fe and unavoidable impurities;
3) be rolled, the control start rolling temperature is not higher than 1120 ℃, and finishing temperature is not higher than 1100 ℃, is rolled down to desired size;
4) water carries out controlled chilling, and temperature is at 850～900 ℃ behind the controlled chilling;
5) nibbling shear;
6) carry out air cooling, be cooled to temperature and be not higher than 400 ℃;
7) carry out cutting to length, and packed for standby use.
The effect of each element and mechanism among the present invention:
C: carbon is strengthening element the most basic in the steel.Carbon content increases in the steel, and yield-point and tensile strength raise, but plasticity and impact reduction, when carbon content surpassed 0.25%, the welding property of steel degenerated, the structural low that therefore is used to weld, and carbon content generally is no more than 0.25%.In addition, carbon can increase the cold shortness and the timeliness susceptibility of steel.
Si: silicon is the solution strengthening element, can significantly improve Yield Of Steel and tensile strength, so be widely used in the strengthening element of structural alloy steel.Silicone content then can cause ys to reduce, as be higher than 0.55% as being lower than 0.42%, can cause ys too high, makes annular chains cause processing difficulties with the plasticity reduction of steel.
Mn: manganese is the solution strengthening element, even if in carbon steel, add 0.80% when above " manganese steel ", enough toughness is not only arranged, and higher intensity and hardness are arranged, and the quenching property of raising steel is improved the comprehensive process performance of steel, and is higher by 40% than Q235 yield-point like the Q345 steel.The manganese amount increases, and reduces welding property.
P: generally speaking, phosphorus is harmful element in the steel.Be prone to produce segregation, increase the cold shortness of steel, welding property is degenerated; Reduce plasticity, cold-bending property is degenerated.For the structure iron that certain request for utilization is arranged, require in the steel phosphorus content less than 0.040%.
S: sulphur also is harmful element under normal conditions.Make steel produce red brittleness, reduce the ductility and the toughness of steel, when rolling, cause crackle.Sulphur is also unfavorable to welding property.So, require sulphur content less than 0.040% for the structure iron that has certain requirements.
Ceq:Ceq=C+Mn/6, the index that proposes when welding property is had requirement is to guarantee that welding material does not crack under certain condition.
The present invention and compared with techniques, it has eliminated the defective because of the higher welding crack that causes of manganese content, P, S control is loose, processing and fabricating is easy, through adopting cooling control after rolling, the ys that has improved steel to 380MPa and more than, draw intensity greater than 580MPa.
Embodiment
Describe in detail in the face of the present invention down:
Test conditions: smelt in the 35t converter.
Embodiment 1
The production ys is 415MPa, and the chain that nominal diameter is 11 millimeters is used round steel, and its component and weight percent are: C:0.23%, and Mn:1.06%, Si:0.42%, P:0.027%, S:0.025%, Ceq:0.41%, all the other are Fe and unavoidable impurities.
Its production stage:
1) smelt: P:0.115% in the control molten steel, S:0.037%, and stay slag operation, the basicity of slag is 2.8; Argon blowing time is 4.1 minutes;
2) carry out continuous casting and heating, heating and temperature control is at 1275～1280 ℃, and be 61 minutes heat-up time; The component of strand and weight percent content: C:0.23%, Mn:1.06%, Si:0.42%, P:0.027%, S:0.025%, Ceq:0.41%, all the other are Fe and unavoidable impurities;
3) be rolled, the control start rolling temperature is at 1110～1120 ℃, and finishing temperature is at 1090～1100 ℃, and rolling arriving needs size;
4) carry out water-cooled, temperature is at 850～860 ℃ behind the controlled chilling;
5) nibbling shear;
6) carry out air cooling, be cooled to 385 ℃ of temperature;
7) carry out cutting to length, and packed for standby use.
Embodiment 2
The production ys is 415MPa, and the chain that nominal diameter is 18 millimeters is used round steel, and its component and weight percent are: C:0.20%, and Mn:1.40%, Si:0.48%, P:0.026%, S:0.024%, Ceq:0.43%, all the other are Fe and unavoidable impurities.
Its production stage:
1) smelt: P:0.11% in the control molten steel, S:0.032%, and stay slag operation, the basicity of slag is 3.0; Argon blowing time is 4.2 minutes;
2) carry out continuous casting and heating, heating and temperature control is at 1265～1270 ℃, and be 70 minutes heat-up time; The component of strand and weight percent content: C:0.20%, Mn:1.40%, Si:0.48%, P:0.026%, S:0.024%, Ceq:0.43%, all the other are Fe and unavoidable impurities;
3) be rolled, the control start rolling temperature is at 1105～1110 ℃, and finishing temperature is at 1080～1085 ℃, and rolling arriving needs size;
4) carry out water-cooled, temperature is at 870～875 ℃ behind the controlled chilling;
5) nibbling shear;
6) carry out air cooling, be cooled to 395 ℃ of temperature;
7) carry out cutting to length, and packed for standby use.
Embodiment 3
The production ys is 420MPa, and the chain that nominal diameter is 30 millimeters is used round steel, and its component and weight percent are: C:0.22%, and Mn:1.56%, Si:0.55%, P:0.031%, S:0.019%, Ceq:0.48%, all the other are Fe and unavoidable impurities.
Its production stage:
1) smelt: P:0.118% in the control molten steel, S:0.03%, and stay slag operation, the basicity of slag is 3.3; Argon blowing time is 4.5 minutes;
2) carry out continuous casting and heating, heating and temperature control is at 1260～1265 ℃, and be 90 minutes heat-up time; The component of strand and weight percent content: C:0.22%, Mn:1.56%, Si:0.55%, P:0.031%, S:0.019%, Ceq:0.48%, all the other are Fe and unavoidable impurities;
3) be rolled, the control start rolling temperature is at 1085～1090 ℃, and finishing temperature is at 1070～1075 ℃, and rolling arriving needs size;
4) carry out water-cooled, temperature is at 895～900 ℃ behind the controlled chilling;
5) nibbling shear;
6) carry out air cooling, be cooled to 380 ℃ of temperature;
7) carry out cutting to length, and packed for standby use.
Embodiment 4
The production ys is 425MPa, and the chain that nominal diameter is 32 millimeters is used round steel, and its component and weight percent are: C:0.25%, and Mn:1.60%, Si:0.52%, P:0.029%, S:0.016%, Ceq:0.52%, all the other are Fe and unavoidable impurities.
Its production stage:
1) smelt: P:0.115% in the control molten steel, S:0.025%, and stay slag operation, the basicity of slag is 3.5; Argon blowing time is 4.7 minutes;
2) carry out continuous casting and heating, heating and temperature control is at 1265～1275 ℃, and be 85 minutes heat-up time; The component of strand and weight percent content: C:0.25%, Mn:1.60%, Si:0.52%, P:0.029%, S:0.016%, Ceq:0.52%, all the other are Fe and unavoidable impurities;
3) be rolled, the control start rolling temperature is at 1065～1070 ℃, and finishing temperature is at 1055～1060 ℃, and rolling arriving needs size;
4) carry out water-cooled, temperature is at 885～890 ℃ behind the controlled chilling;
5) nibbling shear;
6) carry out air cooling, be cooled to 385 ℃ of temperature;
7) carry out cutting to length, and packed for standby use.
Above-mentioned each embodiment steel is through detecting, and its result sees table 1.
Each embodiment steel of table 1 is through detecting its performance tabulation
| Embodiment | R el/MPa | R m/MPa | Unit elongation A/% | Clod wash |
| 1 | 420 | 620 | 33.5 | Well |
| 2 | 415 | 620 | 31.5 | Well |
| 3 | 420 | 650 | 26.0 | Well |
| 4 | 425 | 660 | 26.0 | Well |
Claims (2)
1. an annular chains is used steel, its component and weight percent content: C:0.20～0.25%, and Si:0.42～0.55%, Mn: 1.05～1.60%, P≤0.040%, S≤0.040%, Ceq≤0.52%, all the other are Fe and unavoidable impurities.
2. produce the method for a kind of annular chains, its step with steel:
1) smelt: P≤0.12% in the control molten steel, S≤0.04%, and stay slag operation, the basicity of control slag is 2.8～3.5; Argon blowing time was not less than 4 minutes;
2) carry out continuous casting and heating, heating and temperature control be not higher than 1280 ℃, and be 60～90 minutes heat-up time; The component of strand and weight percent content: C:0.20～0.25%, Si:0.42～0.55%, Mn: 1.05～1.60%, P≤0.040%, S≤0.040%, Ceq≤0.52%, all the other are Fe and unavoidable impurities;
3) be rolled, the control start rolling temperature is not higher than 1120 ℃, and finishing temperature is not higher than 1100 ℃, and rolling arriving needs size;
4) water carries out controlled chilling, and temperature is at 850～900 ℃ behind the controlled chilling;
5) nibbling shear;
6) carry out air cooling, be cooled to temperature and be not higher than 400 ℃;
7) carry out cutting to length, and packed for standby use.
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Citations (5)
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|---|---|---|---|---|
| JPS5792163A (en) * | 1980-11-28 | 1982-06-08 | Nippon Steel Corp | Chain with superior toughness over 70kg/mm2 tensile strength and its manufacture |
| JPH0598388A (en) * | 1991-10-04 | 1993-04-20 | Sumitomo Metal Ind Ltd | High toughness and high carbon thin steel sheet and its manufacture |
| CN1952198A (en) * | 2005-10-17 | 2007-04-25 | 马鞍山钢铁股份有限公司 | Trace niobium -containing steel for cooling-control reinforced bar and method for producing same |
| CN101519751A (en) * | 2008-02-27 | 2009-09-02 | 宝山钢铁股份有限公司 | High-performance marine mooring chain steel and manufacturing method thereof |
| CN102383031A (en) * | 2011-10-28 | 2012-03-21 | 武汉钢铁(集团)公司 | High-strength binding band and production method thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5098388B2 (en) * | 2007-03-20 | 2012-12-12 | 日本電気株式会社 | Clock correction circuit and method and system |
-
2012
- 2012-05-04 CN CN201210135118.6A patent/CN102653834B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5792163A (en) * | 1980-11-28 | 1982-06-08 | Nippon Steel Corp | Chain with superior toughness over 70kg/mm2 tensile strength and its manufacture |
| JPH0598388A (en) * | 1991-10-04 | 1993-04-20 | Sumitomo Metal Ind Ltd | High toughness and high carbon thin steel sheet and its manufacture |
| CN1952198A (en) * | 2005-10-17 | 2007-04-25 | 马鞍山钢铁股份有限公司 | Trace niobium -containing steel for cooling-control reinforced bar and method for producing same |
| CN101519751A (en) * | 2008-02-27 | 2009-09-02 | 宝山钢铁股份有限公司 | High-performance marine mooring chain steel and manufacturing method thereof |
| CN102383031A (en) * | 2011-10-28 | 2012-03-21 | 武汉钢铁(集团)公司 | High-strength binding band and production method thereof |
Non-Patent Citations (1)
| Title |
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| 朱中平: "《中外钢号对照手册》", 30 June 2007, 化学工业出版社 * |
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Effective date of registration: 20180322 Address after: No. 215, Wuchang Avenue, Hubei, Ezhou, Hubei Patentee after: Echeng Iron and Steel Co., Ltd., of Wuhan Iron and Steel Group Address before: 430080 Wuhan, Hubei Friendship Road, No. 999, Wuchang Patentee before: Wuhan Iron & Steel (Group) Corp. |
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Address after: No. 215, Wuchang Avenue, Hubei, Ezhou, Hubei Patentee after: Baowu group Echeng Iron and Steel Co., Ltd Address before: No. 215, Wuchang Avenue, Hubei, Ezhou, Hubei Patentee before: WUHAN IRON AND STEEL GROUP ECHENG IRON AND STEEL Co.,Ltd. |
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