CN101709433A - Steel tube with low temperature resistance and high strength and production method thereof - Google Patents
Steel tube with low temperature resistance and high strength and production method thereof Download PDFInfo
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- CN101709433A CN101709433A CN200910185785A CN200910185785A CN101709433A CN 101709433 A CN101709433 A CN 101709433A CN 200910185785 A CN200910185785 A CN 200910185785A CN 200910185785 A CN200910185785 A CN 200910185785A CN 101709433 A CN101709433 A CN 101709433A
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Abstract
The invention discloses a steel tube with low temperature resistance and high strength and a production method thereof. The steel tube comprises the following alloy components in percentage by weight: C, 0.16-0.20; Si 0.40-0.50; Mn, 1.40-1.60; V, 0.02-0.15; Nb, 0.02-0.06; Ti, 0.02-0.025; Cr, not more than 0.20; Ni, not more than 0.20; P, not more than 0.025; S, not more than 0.015; Mo, not more than 0.10; and the balance of Fe. The components are used as raw materials and subject to steel bloom, perforation, tube rolling and hot sizing to obtain sulphur-resistant oil well pipes, wherein the heating temperature in the perforation working procedure is 1,100-1,300 DEG C and the heating time is 55 minutes; and in the hot sizing working procedure, steel tubes the steel outlet temperature of which is above 800 DEG C are ensured to be subject to air cooling. The invention solves the problems that No. 20 seamless steel tubes have low strength and 16Mn No.20 seamless steel tubes have low low-temperature and poor weather resistance.
Description
Technical field
The present invention relates to a kind of petroleum steel pipe and production method thereof, specifically is a kind of anti-low-temperature high-strength steel pipe and production method thereof.
Background technology
Along with a large amount of exploitations of the western oil-gas field of China, the pipeline network construction of transfering natural gas from the west to the east is more and more closeer, and the requirement of transport pipe is also constantly being improved.And domestic original 20
#Weldless steel tube exists intensity low, 16Mn20
#There are problems such as low temperature weather difference in weldless steel tube.
Summary of the invention
The purpose of this invention is to provide a kind of anti-low-temperature high-strength steel pipe and production method thereof, solved 20
#Weldless steel tube exists intensity low, 16Mn20
#There are problems such as low temperature weather difference in weldless steel tube.
Technical scheme of the present invention is as follows:
A kind of anti-low-temperature high-strength steel pipe is characterized in that the alloying constituent of steel pipe and percentage composition are: C0.16～0.20, Si0.40～0.50, Mn1.40～1.60, V0.02～0.15, Nb0.02～0.06, Ti0.02～0.025, Cr≤0.20, Ni≤0.20, P≤0.025, S≤0.015, Mo≤0.10, surplus is an iron.
Described a kind of anti-low-temperature high-strength steel tube producing method, it is characterized in that: the alloying constituent with steel pipe is that raw material obtains anti-sulphur oil well pipe after making steel billet, perforation, tube rolling, reaching hot size, wherein: Heating temperature is 1100～1300 ℃ in perforation process, and be 55 minutes heat-up time; In the hot size operation, guarantee tapping temperature air cooling more than 800 ℃ behind the sizing; Adopt hot rolling to become a useful person in the system steel billet, heat-up time is greater than 1.5 hours, and the male and female face temperature difference is less than 50 ℃, 1160～1200 ℃ of steel billet tapping temperatures, and finishing temperature is greater than 850 ℃.
As a further improvement on the present invention, adopt hot rolling to become a useful person in the system steel billet, heat-up time is greater than 1.5 hours, and the male and female face temperature difference is less than 50 ℃, 1160～1200 ℃ of steel billet tapping temperatures, and finishing temperature is greater than 850 ℃.
The present invention has adopted the chemical composition design after optimizing, and the further reduction of S, P composition is greatly improved the over-all properties of material; Strength Changes after its supply of material attitude and the differing temps SR thermal treatment is little, and ballistic work rises to some extent; Cold plasticity is fine, and also more than 60J, nil-ductility temperature is-15 ℃ to the impelling strength of supply of material attitude-40 ℃; Preheating does not all have cold crack and produces more than 200 ℃.Welding joint is through the thermal treatment of the SR of differing temps stress relieving, and the tensile strength of welding joint has decline slightly, and the ballistic work of weld metal and welded heat affecting zone is constant substantially, but the as-welded relatively raising that all has in various degree of impelling strength.As-welded-40 ℃ impelling strength in weld seam center still is higher than the standard code index.
Embodiment
The alloying constituent of anti-low-temperature high-strength steel pipe and percentage composition are: C0.16～0.20, Si0.40～0.50, Mn1.40～1.60, V0.02～0.15, Nb0.02～0.06, Ti0.02～0.025, Cr≤0.20, Ni≤0.20, P≤0.025, S≤0.015, Mo≤0.10 surplus is an iron, with the mentioned component is that raw material obtains anti-sulphur oil well pipe after making steel billet, perforation, tube rolling, reaching hot size, and wherein: Heating temperature is 1100～1300 ℃ in perforation process, and be 55 minutes heat-up time; In the hot size operation, guarantee tapping temperature air cooling more than 800 ℃ behind the sizing.
Embodiment:
1. metallurgical basic technology is EAF white slag+LFV vacuum outgas
1) EAF white slag:
Furnace charge is selected low S, P machine steel, crop and high duty pig iron for use; Alloy need be prepared low-carbon (LC) chromium, low Carbon Manganese, molybdenum-iron, aluminium ingot etc.; Reductive agent employing calcium carbide 2-3kg/t, carbon dust also must be grilled thoroughly in right amount, the aluminium powder deoxidation keeps white slag; Decarburized amount 〉=0.30% goes out the quantity of slag [C]≤0.04%, but can not peroxidation; Mn is adjusted with low-carbon (LC) Fe-Mn in tapping temperature 〉=1650 ℃: slag tap [C], [P], T ℃ meets the requirements to add and adjusts Mn to 0.30%; Clean boiling time 〉=5 minutes; Slag tap to finish and insert Al0.8kg/t, must insert molten steel with iron staff; Press analytical results with addition of alloy to specialized range; 1650 ± 10 ℃ of tapping temperatures; Al is assigned to 0.75%, and aluminium ingot adds in the ladle with steel stream.
2) LFV vacuum outgas:
Ladle is taken a seat, thermometric, analysis, according to circumstances adjusts the Ar atmospheric pressure.Adjust composition to the internal control scope according to analytical results; When molten steel thermometric 〉=1620 ℃, can advance the vacuum degassing, observe situation during the degassing at any time, by gradient pump, 66.7Pa vacuum tightness keeps more than 10 minutes.The bull ladle pouring condition is to strive that all compositions enter enterprise's internal control scope; 1575～1585 ℃ of temperature.
2. cast
Use " 7030 " covering slag, and dry, water and finish the lifting of raising one's hat in 80 minutes, heat is delivered to the breaking down operation in 3.5 hours
3. breaking down cogging
Thermal process is carried out by " 5-first group ", and blank must C portion be managed, and billet yield≤80% is more than the cold 36h in hole, back.Cogged ingot must be cut to after full peeling.Every stove is got the molten one section Φ 35 * 200mm of sample that inspects, the censorship oxygen level.Get one section 140 side, 1.0～1.5 stub bars, the two ends cold saw is flat, strikes " grade of steel and heat (batch) number " and send the structure iron research department.
4. hot rolling is become a useful person
Hot-work heating cycle: heat-up time 〉=1.5 hour; The male and female face temperature difference≤50 ℃; 1160～1200 ℃ of steel billet tapping temperatures; Finishing temperature 〉=850 ℃; Cooling in heap.Finished steel should grind straightening processing through acid, check etc.
5. perforation
Rod iron carries out blanking after seamless steel tubing mill; Rod iron adds hot piercing: 1210 ± 10 ℃ of Heating temperatures; 55 minutes heat-up times.The heating of pipe blank end temperature difference is not more than ± and 10 ℃.
6. tube rolling-hot size
Directly advance ACCU-ROLL tube rolling mill tube rolling after the perforation, milling train is adjusted to the wall thickness of hollow forging regulation, the into sizing mill of ining succession is again produced the steel pipe sizes of regulation, will guarantee tapping temperature air cooling more than 850 ± 10 ℃ behind the sizing; The test of pilot scale chamber is sent in sampling.
7. aligning, cutting
Recessed, defectives such as aligning is oval, aligning decorative pattern must not appear in the steel pipe aligning process rectifying; Steel pipe crop end, pipe end must be cut into vertically, and fin cutting.
Claims (2)
1. an anti-low-temperature high-strength steel pipe is characterized in that the alloying constituent of steel pipe and percentage composition are: C0.16～0.20, Si0.40～0.50, Mn1.40～1.60, V0.02～0.15, Nb0.02～0.06, Ti0.02～0.025, Cr≤0.20, Ni≤0.20, P≤0.025, S≤0.015, Mo≤0.10, surplus is an iron.
2. a kind of anti-low-temperature high-strength steel tube producing method according to claim 1, it is characterized in that: the alloying constituent with steel pipe is that raw material obtains anti-sulphur oil well pipe after making steel billet, perforation, tube rolling, reaching hot size, wherein: Heating temperature is 1100～1300 ℃ in perforation process, and be 55 minutes heat-up time; In the hot size operation, guarantee tapping temperature air cooling more than 800 ℃ behind the sizing; Adopt hot rolling to become a useful person in the system steel billet, heat-up time is greater than 1.5 hours, and the male and female face temperature difference is less than 50 ℃, 1160～1200 ℃ of steel billet tapping temperatures, and finishing temperature is greater than 850 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910185785A CN101709433A (en) | 2009-12-03 | 2009-12-03 | Steel tube with low temperature resistance and high strength and production method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910185785A CN101709433A (en) | 2009-12-03 | 2009-12-03 | Steel tube with low temperature resistance and high strength and production method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN101709433A true CN101709433A (en) | 2010-05-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN200910185785A Pending CN101709433A (en) | 2009-12-03 | 2009-12-03 | Steel tube with low temperature resistance and high strength and production method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101942615A (en) * | 2010-08-26 | 2011-01-12 | 姚圣法 | Machining method of high-strength and ultra high-strength steel tubes |
| CN102212751A (en) * | 2011-06-03 | 2011-10-12 | 首钢总公司 | Steel for high-strength petroleum casing pipe used in heavy oil thermal recovery well and manufacturing method thereof |
| CN112575243A (en) * | 2019-09-27 | 2021-03-30 | 宝山钢铁股份有限公司 | High-strength anti-fatigue seamless steel tube and manufacturing method thereof |
-
2009
- 2009-12-03 CN CN200910185785A patent/CN101709433A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101942615A (en) * | 2010-08-26 | 2011-01-12 | 姚圣法 | Machining method of high-strength and ultra high-strength steel tubes |
| CN102212751A (en) * | 2011-06-03 | 2011-10-12 | 首钢总公司 | Steel for high-strength petroleum casing pipe used in heavy oil thermal recovery well and manufacturing method thereof |
| CN112575243A (en) * | 2019-09-27 | 2021-03-30 | 宝山钢铁股份有限公司 | High-strength anti-fatigue seamless steel tube and manufacturing method thereof |
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Open date: 20100519 |