CN100347326C - Alloy-steel seam-less steel-pipe and production method therefor - Google Patents
Alloy-steel seam-less steel-pipe and production method therefor Download PDFInfo
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- CN100347326C CN100347326C CNB2005100163870A CN200510016387A CN100347326C CN 100347326 C CN100347326 C CN 100347326C CN B2005100163870 A CNB2005100163870 A CN B2005100163870A CN 200510016387 A CN200510016387 A CN 200510016387A CN 100347326 C CN100347326 C CN 100347326C
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Abstract
The present invention provides an alloy steel seamless steel pipe which comprises the following chemical components: at most 0.12 wt% of C, at most 0.30 wt% of Si, 0.30 to 0.60 wt% of Mn, 4.00 to 6.00 wt% of Cr, at most 0.20 wt% of Cu, less than 0.025 wt% of P, less than 0.020 wt% of S and Fe as the rest. The present invention also provides a production method of the alloy steel seamless steel pipe. The present invention has the effect of good thermal stability of the alloy steel seamless steel pipe material, favorable impact toughness, stable lasting plasticity, high heat resistance and corrosion resistance. The yield stress of the alloy steel seamless steel pipe is not lower than 195MPa. The mechanical property, the creep strength, the high temperature strength and the corrosion resistance of the alloy steel seamless steel pipe body achieve a required level by adopting a specific heat treating and straightening technology, the alloy steel seamless steel pipe has sufficient safety margin in an operating pressure range and an operating temperature range, and meanwhile, the antioxidation and anticorrosion requirements of the pipe body are satisfied. The mechanical property, the high temperature resistance and the corrosion resistance of the pipe body can be ensured by controlling the geometric size, the residual stress, the shape deviation and the chemical components of the pipe body.
Description
Technical field
The present invention is the employed high-temperature mechanical property of pipeline and the good alloy steel seamless steel tube and the production method thereof of erosion resistance of a kind of chemical industry equipment and power boiler etc., this alloy steel pipe not only has high antioxidant property and high temperature resistance steam corrosion performance, but also has high and stable rupture ductility and the heat resistance energy of good impelling strength.
Background technology
Generally, alloy steel seamless steel tube is to use with the steam-pipe of steel pipe, Nuclear power plants heat exchanger, boiler tubing and high temperature collection case as cracking of oil device boiler tube, hyperthermia and superheating organ pipe, reheater.Particularly one of product of industries urgent needs such as power house, the energy and chemical industry also is the product of high added value, high economic benefit.In power boiler, be used as superheater, reheater and main steam pipe road and use, and in process units such as the cracking of petrochemical industry, anti-sulphur, hydrogenation, also obtain widespread use.
At present, the main dependence on import of the alloy steel seamless steel tube of China, the difficult point of its manufacturing is: low by the heat-resisting and corrosion resistance nature that the deviation of materials chemistry composition produces, and in perforation, continuous rolling, decide very easily to make in the manufacturing process such as reducing and rolling, thermal treatment and aligning alloy steel seamless steel tube defectives such as inequality, crackle, folding, absciss layer and surface oxidation to occur being out of shape.
Summary of the invention
The objective of the invention is to provide a kind of alloy steel seamless steel tube and production method thereof, the employed good high-temperature mechanical property of pipeline of adaptation construction equipment and power boiler etc. and the steel pipe of erosion resistance are with high temperature resistant, the high pressure and the corrosive needs of the vapour pipe that satisfies heat power station, nuclear energy power generation station, cracking of oil equipment and pressure vessels for the chemical industry etc., superheater tube, reheater tube.This alloy steel seamless steel tube is a T5 grade of steel weldless steel tube, produces and check the ASTM standard of carrying out the U.S..
For achieving the above object, the technical solution used in the present invention provides a kind of alloy steel seamless steel tube, the Chemical Composition of described alloy steel seamless steel tube (weight %) is: C≤0.12, Si≤0.30, Mn 0.30～0.60, Cr4.00～6.00, Cu≤0.20, P＜0.025, S＜0.020, surplus is Fe.
The production method of described weldless steel tube may further comprise the steps:
At first, described alloy steel seamless steel tube selects for use sponge iron and steel scrap as steelmaking feed, is fused into molten steel with electric arc furnace, after external refining and vacuum outgas, obtains the Chemical Composition of described alloy steel seamless steel tube;
Then, through the circular pipe of continuous caster continuous casting, with cooled continuously cast billet for pipe-making at the process furnace internal heating, furnace temperature is 1260～1280 ℃, after described continuously cast billet for pipe-making is rolled into alloy steel seamless steel tube, heat-treat: temperature be 920～960 ℃ with bright normalizing furnace normalizing, be 680～690 ℃ of tempering in temperature;
Then, be 500 ℃-550 ℃ in temperature and carry out hot straightening.
After heat treatment, the mechanical property of described alloy steel seamless steel tube is by the sampling of ASTM standard-required and the sample preparation of the U.S., and the index that its mechanical property reaches is as follows:
Yield strength (σ S) 〉=195MPa;
Tensile strength (σ b) 〉=390MPa;
Unit elongation A% 〉=22%;
Hardness≤187HB;
Ballistic work: minimum value is calculated 〉=92J by the ASTM standard of the U.S.;
Wall thickness deviation :≤± 12.0t% (t is the wall thickness of weldless steel tube);
Outside diameter tolerance :≤± 1.0d% (d is the diameter of weldless steel tube).
Effect of the present invention is the Heat stability is good of described alloy steel seamless steel tube material, has good impelling strength, stable rupture ductility, high heat resistance energy and corrosion resistance nature, and its yield strength is not less than 195MPa.By adopting special thermal treatment and straightening process, make mechanical property, creep strength, hot strength and the corrosion resistance nature of described alloy steel seamless steel tube body reach the desired level of standard, in the pressure and temperature range of its operation, competent safety margin is arranged, can satisfy the anti-oxidant and erosion-resisting requirement of body simultaneously.Geometrical dimension, unrelieved stress, form variations and Chemical Composition by the control body can guarantee the mechanical property of body, high temperature resistant and corrosion resistance nature.
Embodiment
In conjunction with the embodiments a kind of alloy steel seamless steel tube of the present invention and production method thereof are illustrated.
A kind of have high temperature resistant and the corrosive alloy steel seamless steel tube, and the Chemical Composition of described alloy steel seamless steel tube (weight %) is: C≤0.12, and Si≤0.30, Mn0.30～0.60, Cr4.00～6.00, Cu≤0.20, P＜0.025, S＜0.020, surplus is Fe.
The mechanical property of described alloy steel seamless steel tube by the technical indicator that the ASTM standard-required is taken a sample and sample preparation is reached of the U.S. is:
Yield strength (σ S) 195MPa;
Tensile strength (σ b) 〉=390MPa;
Unit elongation A% 〉=22%;
Hardness≤187HB
Ballistic work: minimum value is calculated 〉=92J by the ASTM standard of the U.S.;
Wall thickness deviation :≤± 12.0t% (t is the wall thickness of weldless steel tube);
Outside diameter tolerance :≤± 1.0d% (d is the diameter of weldless steel tube).
The production method of the above-mentioned weldless steel tube that is provided may further comprise the steps:
At first, described alloy steel seamless steel tube selects for use sponge iron and steel scrap as steelmaking feed, is fused into molten steel with electric arc furnace, after external refining and vacuum outgas, obtains the described Chemical Composition of described alloy steel seamless steel tube, the circular pipe of continuous casting.
Then, through the circular pipe of continuous caster continuous casting, with cooled continuously cast billet for pipe-making at the rotary heating furnace internal heating, furnace temperature is 1260～1280 ℃, in temperature is 1250～1260 ℃ of heat centering, in temperature is 1200～1240 ℃ of hot piercings, being 1000～1150 ℃ in temperature extends rolling continuously, through deciding reducing and rolling, cooling, the fixed length sawing, aligning, flaw detection, after the check, after described continuously cast billet for pipe-making is rolled into alloy steel seamless steel tube, heat-treat: temperature be 920～960 ℃ with bright normalizing furnace normalizing (preventing the steel tube surface oxidation), be 680～690 ℃ of tempering in temperature.
Then, be 500 ℃-550 ℃ in temperature and carry out hot straightening.Then temperature be 500 ℃-? temperature is carried out hot straightening more than ℃, at last flaw detection.
The bright normalizing stove is adopted in described normalizing, and air cooling is adopted in tempering.
Below by embodiment implementation procedure of the present invention is described.
Embodiment:
By the composition of described alloy steel seamless steel tube and method produce alloy steel seamless steel tube (Φ 114.3 * 13.49mm), and its Chemical Composition and processing parameter are as follows:
The Chemical Composition of described alloy steel seamless steel tube (weight %) is: C≤0.12, and Si≤0.30, Mn0.30～0.60, Cr 4.00～6.00, Cu≤0.20, P＜0.025, S＜0.020, surplus is Fe.
Adopt sponge iron and steel scrap to do steelmaking feed, with being fused into molten steel in the electric arc furnace, after external refining and vacuum outgas, obtain Chemical Composition as mentioned above, continuous casting becomes the circle base.With cooled continuously cast bloom at the rotary heating furnace internal heating, furnace temperature is 1260～1280 ℃, in temperature is 1250～1260 ℃ of heat centering, in temperature is 1200～1240 ℃ of hot piercings, being 1000～1150 ℃ in temperature extends rolling continuously, through deciding reducing and rolling, cooling, the fixed length sawing, aligning, after the flaw detection, heat-treat: temperature be 920～960 ℃ with bright heat treatment furnace normalizing (preventing the steel tube surface oxidation), in temperature is 680～690 ℃ of tempering, be 580～610 ℃ of hot sizes in temperature then, when being 500 ℃-550 ℃, temperature carries out hot straightening, at last flaw detection.
After heat treatment, the index that reaches of the mechanical property of described alloy steel seamless steel tube is as follows:
Yield strength (σ S) 425MPa;
Tensile strength (σ b) 〉=550MPa;
Unit elongation A% 〉=23%;
Hardness≤185HB
Ballistic work: minimum value is calculated 〉=107J by the ASTM standard of the U.S.;
Wall thickness deviation :≤± (3.5～6) % (d is the diameter of weldless steel tube);
Outside diameter tolerance :≤± 0.50% (t is the wall thickness of weldless steel tube).
Success is in boiler factory, Heilongjiang Province experimental applications for described alloy steel seamless steel tube, and result of use is fine.
The present invention is the employed high-temperature mechanical property of pipeline and the good alloy steel seamless steel tube and the production method thereof of erosion resistance of a kind of chemical industry equipment and power boiler etc., this alloy steel pipe not only has high antioxidant property and high temperature resistance steam corrosion performance, but also has high and stable rupture ductility and the heat resistance energy of good impelling strength.Generally, use with the steam-pipe of steel pipe, Nuclear power plants heat exchanger, boiler tubing and high temperature collection case as cracking of oil device boiler tube, hyperthermia and superheating organ pipe, reheater.
Claims (4)
1, a kind of have high temperature resistant and the corrosive alloy steel seamless steel tube, and it is characterized in that: the Chemical Composition of described alloy steel seamless steel tube (weight %) is: C≤0.12, Si≤0.30, Mn 0.30～0.60, and Cr 4.00～6.00, Cu≤0.20, P＜0.025, S＜0.020, surplus is Fe.
2, according to claim 1 have high temperature resistant and the corrosive alloy steel seamless steel tube, it is characterized in that: the mechanical property of described alloy steel seamless steel tube by the technical indicator that the ASTM standard-required is taken a sample and sample preparation is reached of the U.S. is:
Yield strength (σ S) 195MPa;
Tensile strength (σ b) 〉=390MPa;
Unit elongation A% 〉=22%;
Hardness≤187HB;
Ballistic work: minimum value is calculated 〉=92J by the ASTM standard of the U.S.;
Wall thickness deviation :≤± 12.0t%, wherein t is the wall thickness of weldless steel tube;
Outside diameter tolerance :≤± 1.0d%, wherein d is the diameter of weldless steel tube.
3, a kind of production method by the described alloy steel seamless steel tube of claim 1, described production method may further comprise the steps:
At first, described alloy steel seamless steel tube selects for use sponge iron and steel scrap as steelmaking feed, is fused into molten steel with electric arc furnace, after external refining and vacuum outgas, obtains the Chemical Composition of described alloy steel seamless steel tube;
Then, through the circular pipe of continuous caster continuous casting, with cooled continuously cast billet for pipe-making at the process furnace internal heating, furnace temperature is 1260～1280 ℃, after described continuously cast billet for pipe-making is rolled into alloy steel seamless steel tube, heat-treat: temperature be 920～960 ℃ with bright normalizing furnace normalizing, be 680～690 ℃ of tempering in temperature;
Then, be 500 ℃-550 ℃ in temperature and carry out hot straightening.
4, method according to claim 3 is characterized in that: the bright normalizing stove is adopted in described normalizing, and air cooling is adopted in tempering.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CNB2005100163870A CN100347326C (en) | 2005-11-24 | 2005-11-24 | Alloy-steel seam-less steel-pipe and production method therefor |
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| CNB2005100163870A CN100347326C (en) | 2005-11-24 | 2005-11-24 | Alloy-steel seam-less steel-pipe and production method therefor |
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| CN1775982A CN1775982A (en) | 2006-05-24 |
| CN100347326C true CN100347326C (en) | 2007-11-07 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101440428B (en) * | 2008-12-19 | 2010-06-16 | 常州市新亚不锈钢管有限公司 | Production method of seamless stainless steel tube for high-pressure boiler |
| CN103801920B (en) * | 2012-11-13 | 2016-03-02 | 中国广核集团有限公司 | The replacing options of nuclear power station unit primary Ioops pressure boundary pipeline |
| CN106011666A (en) * | 2016-06-03 | 2016-10-12 | 深圳市樊溪电子有限公司 | Low alloy steel, steel pipe and manufacturing method of steel pipe |
| CN111889523B (en) * | 2019-05-05 | 2022-07-08 | 中冶赛迪重庆信息技术有限公司 | Seamless steel tube wall thickness control method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1288071A (en) * | 2000-01-25 | 2001-03-21 | 天津钢管公司 | High strength petroleum annular tubes for prodn. of super visous crude thermal prodn. well |
| US6217676B1 (en) * | 1997-09-29 | 2001-04-17 | Sumitomo Metal Industries, Ltd. | Steel for oil well pipe with high corrosion resistance to wet carbon dioxide and seawater, and a seamless oil well pipe |
| CN1361303A (en) * | 2000-12-29 | 2002-07-31 | 天津钢管公司 | TP65 steel level petroleum casing and its manufacture |
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- 2005-11-24 CN CNB2005100163870A patent/CN100347326C/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6217676B1 (en) * | 1997-09-29 | 2001-04-17 | Sumitomo Metal Industries, Ltd. | Steel for oil well pipe with high corrosion resistance to wet carbon dioxide and seawater, and a seamless oil well pipe |
| CN1288071A (en) * | 2000-01-25 | 2001-03-21 | 天津钢管公司 | High strength petroleum annular tubes for prodn. of super visous crude thermal prodn. well |
| CN1361303A (en) * | 2000-12-29 | 2002-07-31 | 天津钢管公司 | TP65 steel level petroleum casing and its manufacture |
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Owner name: TIANJIN STEEL TUBE GROUP CO., LTD. Free format text: FORMER NAME OR ADDRESS: TIANJIN STEEL PIPE GROUP CO., LTD. |
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| CP01 | Change in the name or title of a patent holder |
Address after: 300301 Jintang Road, Dongli District, Tianjin Patentee after: Tianjin Steel Pipe Group Co., Ltd. Address before: 300301 Jintang Road, Dongli District, Tianjin Patentee before: Tianjin Pipe (Group) Corp. |
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Effective date of registration: 20190627 Address after: No. 396 Jintang Highway, Dongli District, Tianjin 300301 Patentee after: Tianjin Steel Tube Manufacturing Co., Ltd. Address before: 300301 Jintang Road, Dongli District, Tianjin Patentee before: Tianjin Steel Pipe Group Co., Ltd. |