CN104480409A - 06Cr17Ni12Mo2Ti austenitic stainless steel pipe and production process thereof - Google Patents
06Cr17Ni12Mo2Ti austenitic stainless steel pipe and production process thereof Download PDFInfo
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Abstract
The invention discloses a 06Cr17Ni12Mo2Ti austenitic stainless steel pipe comprising the following chemical components in percentage by mass: 0.021-0.023% of C, 0.62-0.64% of Si, 1.88-1.90% of Mn, 17.1-17.3% of Cr, 11.9-12.1% of Ni, 2.43-2.45% of Mo, 0.7-0.9% of Cu, 0.22-0.24% of Al, 0.07-0.09% of N, 0.11-0.13% of Ca, 0.055-0.057% of Se, 0.016-0.018% of Te, 0.13-0.7% of Ti, 0.013-0.015% of S, 0.008-0.010% of P, 0.15-0.17% of rare-earth elements, and the balance of Fe and inevitable impurities, wherein the rare-earth elements comprise 15-17% of europium, 9-11% of samarium, 25-27% of praseodymium, 12-14% of neodymium, 5-7% of samarium and the balance of lanthanum. The invention also provides a production process of the 06Cr17Ni12Mo2Ti austenitic stainless steel pipe. The 06Cr17Ni12Mo2Ti austenitic stainless steel pipe disclosed by the invention has a stable austenitic structure, does not have magnesium, has high toughness and plasticity, good free-cutting machinability, oxidizing acid medium resistance, sulfuric acid corrosion resistance, phosphoric acid corrosion resistance, formic acid corrosion resistance, acetic acid corrosion resistance, urea corrosion resistance and the like, is resistant to inter-crystalline corrosion at the same time, and has overall and good comprehensive properties.
Description
Technical field
The invention belongs to technical field of metal, relate to a kind of stainless steel tube production technique, specifically a kind of 06Cr17Ni12Mo2Ti austenitic stainless steel pipe and production technique.
Background technology
Along with high speed development and the scientific and technological progress of national economy, the range of application of stainless steel tube is increasingly extensive, also more and more higher to the requirement of stainless steel tube, in order to the service requirements making stainless steel tube meet every field on quality and quantity, in the exploitation of new steel grade, there is fast development both at home and abroad; China's stainless steel still has larger gap with international most advanced level in Technology, equipment, quality product etc., needs constantly to research and develop, technological transformation and raising, to adapt to the requirement of the national economic development; Current stainless steel tube is widely used in every field: the industry of automotive industry, water and wastewater industry, environment-protecting industrial, industrial plants, household electrical appliances, the mainly austenitic stainless steel that amount ratio is larger, along with the progress of technology and production needs, all need constantly to develop new type stainless steel. corrosion resistance from raw material resources and material cost and the angle that reaches physics and chemistry and mechanical property requirements.
Corrosionproof heatproof has Φ 6-508 without the specification that magnetic austenite stainless steel seamless steel tube is common, before production domesticization, and whole dependence on import.Current company intends exploitation corrosionproof heatproof without magnetic austenite stainless steel seamless steel tube 06Cr17Ni12Mo2Ti etc., properties is made to reach same kind of products at abroad level, complete alternative similar ASTM/ASME product is also widely used in most and corrodes in serious industry or ocean environment, as the flyer of the production units such as extra large water equipment, chemistry, dyestuff, papermaking, oxalic acid, fertilizer, foodstuffs industry, coastal installation, anti-grain boundary corrosion, boiler-steam dome and steam discharge pipe.
Summary of the invention
Technical problem to be solved by this invention is, overcome the shortcoming of prior art, a kind of 06Cr17Ni12Mo2Ti austenitic stainless steel pipe and production technique are provided, product of the present invention has stable austenite structure, nonmagnetic and there is high tenacity and plasticity, there is good free-cutting machinability, the corrosion of scale resistance acid medium and sulfuric acid, phosphoric acid and formic acid, acetic acid, urea etc., and simultaneously intergranular corrosion resistance, there is comprehensive and good over-all properties.
In order to solve above technical problem, the invention provides a kind of 06Cr17Ni12Mo2Ti austenitic stainless steel pipe, its chemical composition and mass percent are: C:0.021-0.023%, Si:0.62-0.64%, Mn:1.88-1.90%, Cr:17.1-17.3%, Ni:11.9-12.1%, Mo:2.43-2.45%, Cu:0.7-0.9%, Al:0.22-0.24%, N:0.07-0.09%, Ca:0.11-0.13%, Se:0.055-0.057%, Te:0.016-0.018%, Ti:0.13-0.7%, S:0.013-0.015%, P:0.008-0.010%, rare earth element: 0.15-0.17%, all the other are Fe and inevitable impurity,
Described rare earth element comprises: the praseodymium of the europium of 15-17%, the samarium of 9-11%, 25-27%, the neodymium of 12-14%, the samarium of 5-7%, and all the other are lanthanum.
The Mo element added in product of the present invention can improve spot corrosion and slit and corrosion resistant, improves stainless hot strength and welding property, durable creeping performance and heat-proof corrosion-resistant and work hardening without magnetic dominance; Add the corrosion that Cu element can also prevent sulfuric acid, phosphoric acid and formic acid, acetic acid, urea etc. simultaneously; In product, C content is 0.021-0.023%, and adds Ti, Ni simultaneously, then can significantly improve its intergranular corrosion resistance performance and resistance to stress ability, reduces the risk of weld seam corrosion; Austenitic stainless steel containing Si has good solidity to corrosion to concentrated nitric acid; Ni element and the mating reaction of Cr element can improve high-temperature oxidation resistance and intensity; The S element added, Se element then can improve machinability and component surface precision.
The technical scheme that the present invention limits further is:
The present invention also provides a kind of production technique of 06Cr17Ni12Mo2Ti austenitic stainless steel pipe, and its operational path is: refining pipe → inspection → peeling sawing → heating → perforation → the first pickling → hollow forging inspection → cold rolling/first cold-drawn → the first degreasing → the first thermal treatment → the first aligning Pipe Cutting → the second pickling → the second cold-drawn → the second degreasing → the second thermal treatment → the second aligns Pipe Cutting → the 3rd pickling → three degreasing → intermediate survey → assembled watch inspection → hydraulic pressure → UT (Ultrasonic Testing) → eddy current test → size/surface examination → spray mark → clean → packaging → transport;
Heating steps: Heating temperature is 1150-1170 DEG C, heat-up time is 16-18 hour;
Cold rolling/first cold-drawn step: adopt three roller finishing mill sizes of pipe and tubing to control, the deviation control of production tube external diameter, wall thickness dimension ± 0.03mm, surfaces externally and internally roughness≤0.8um;
First heat treatment step: preheating temperature is: 845-865 DEG C, Heating temperature is: 1180-1190 DEG C, and soaking temperature is: 1030-1050 DEG C;
Second heat treatment step: for the thermal treatment of bend pipe and elbow, the ratio R/D=1.2-1.8 of the minimum bending radius of bend pipe and tube outer diameter, bend pipe ovality is 5.3-7%, and pipe leg spacing minimum deviation controls at ± 1.5mm, elbow subtracts wall 11-15%, and Heating temperature is 950-1050 DEG C.
Further,
Aforementioned heating steps and the first heat treatment step adopt stove at the bottom of Sweet natural gas Continuous Roller or the solid smelting furnace of continous way light, with the water cooling rapidly of the speed of 11-15 DEG C/s after the first heat treatment step heating; Second heat treatment step adopts intermediate frequency contact heating bend pipe and elbow, and adopts infrared measurement of temperature control temperature.
The invention has the beneficial effects as follows:
The Mo element added in product of the present invention can improve spot corrosion and slit and corrosion resistant, improves stainless hot strength and welding property, durable creeping performance and heat-proof corrosion-resistant and work hardening without magnetic dominance; Add the corrosion that Cu element can also prevent sulfuric acid, phosphoric acid and formic acid, acetic acid, urea etc. simultaneously; In product, C content is 0.021-0.023%, and adds Ti, Ni simultaneously, then can significantly improve its intergranular corrosion resistance performance and resistance to stress ability, reduces the risk of weld seam corrosion; Austenitic stainless steel containing Si has good solidity to corrosion to concentrated nitric acid; Ni element and the mating reaction of Cr element can improve high-temperature oxidation resistance and intensity; The S element added, Se element then can improve machinability and component surface precision.
In present invention process, relate to once heating and twice thermal treatment, Heating temperature during heating process is 1150-1170 DEG C, heat-up time is 16-18 hour, can make variously in alloy fully to dissolve mutually, grain refining, internal carbides distribution uniformity, Intensive intervention body also improves toughness and etch resistant properties, removes internal stress and the softener material of material, to continue machine-shaping;
First thermal treatment adopts progressive solution, comprise: preheating temperature 845-865 DEG C, Heating temperature 1180-1190 DEG C, soaking temperature 1030-1050 DEG C, the residual stress that this step produces when eliminating workpiece quenching, prevent distortion and cracking, adjust the hardness of workpiece, intensity, plasticity and toughness, reach use properties requirement;
Second thermal treatment is used for the thermal treatment of bend pipe and elbow, can remove the internal stress of bend pipe and bend part, adjusts the hardness of workpiece, intensity, plasticity and toughness, to reach with the consistent mechanical property of straight length.
Product of the present invention has stable austenite structure, nonmagnetic and there is high tenacity and plasticity, there is good free-cutting machinability, the corrosion of scale resistance acid medium and sulfuric acid, phosphoric acid and formic acid, acetic acid, urea etc., and simultaneously intergranular corrosion resistance, there is comprehensive and good over-all properties.
Embodiment
embodiment 1
The present embodiment provides a kind of 06Cr17Ni12Mo2Ti austenitic stainless steel pipe, and its chemical composition and mass percent are: C:0.021%, Si:0.62%, Mn:1.88%, Cr:17.1%, Ni:11.9%, Mo:2.43%, Cu:0.7%, Al:0.22%, N:0.07%, Ca:0.11%, Se:0.055%, Te:0.016%, Ti:0.13%, S:0.013%, P:0.008%, rare earth element: 0.15%, all the other are Fe and inevitable impurity; Rare earth element comprises: the europium of 15%, the samarium of 9%, 25% praseodymium, the neodymium of 12%, the samarium of 5%, all the other are lanthanum.
The present embodiment also provides a kind of production technique of 06Cr17Ni12Mo2Ti austenitic stainless steel pipe, and its operational path is: refining pipe → inspection → peeling sawing → heating → perforation → the first pickling → hollow forging inspection → cold rolling/first cold-drawn → the first degreasing → the first thermal treatment → the first aligning Pipe Cutting → the second pickling → the second cold-drawn → the second degreasing → the second thermal treatment → the second aligns Pipe Cutting → the 3rd pickling → three degreasing → intermediate survey → assembled watch inspection → hydraulic pressure → UT (Ultrasonic Testing) → eddy current test → size/surface examination → spray mark → clean → packaging → transport;
Heating steps: Heating temperature is 1150 DEG C, heat-up time is 18 hours;
Cold rolling/first cold-drawn step: adopt three roller finishing mill sizes of pipe and tubing to control, the deviation control of production tube external diameter, wall thickness dimension ± 0.03mm, surfaces externally and internally roughness≤0.8um;
First heat treatment step: preheating temperature is: 845 DEG C, Heating temperature is: 1180 DEG C, and soaking temperature is: 1030 DEG C;
Second heat treatment step: for the thermal treatment of bend pipe and elbow, the ratio R/D=1.2 of the minimum bending radius of bend pipe and tube outer diameter, bend pipe ovality is 7%, and pipe leg spacing minimum deviation controls at ± 1.5mm, and elbow subtracts wall 11%, and Heating temperature is 1050 DEG C.
Wherein, heating steps and the first heat treatment step adopt stove at the bottom of Sweet natural gas Continuous Roller or the solid smelting furnace of continous way light, with the water cooling rapidly of the speed of 11 DEG C/s after the first heat treatment step heating; Second heat treatment step adopts intermediate frequency contact heating bend pipe and elbow, and adopts infrared measurement of temperature control temperature.
embodiment 2
The present embodiment provides a kind of 06Cr17Ni12Mo2Ti austenitic stainless steel pipe, and its chemical composition and mass percent are: C:0.023%, Si:0.64%, Mn:1.90%, Cr:17.3%, Ni:12.1%, Mo:2.45%, Cu:0.9%, Al:0.24%, N:0.09%, Ca:0.13%, Se:0.057%, Te:0.018%, Ti:0.7%, S:0.015%, P:0.010%, rare earth element: 0.17%, all the other are Fe and inevitable impurity; Rare earth element comprises: the europium of 17%, the samarium of 11%, 27% praseodymium, the neodymium of 14%, the samarium of 7%, all the other are lanthanum.
The present embodiment also provides a kind of production technique of 06Cr17Ni12Mo2Ti austenitic stainless steel pipe, and its operational path is: refining pipe → inspection → peeling sawing → heating → perforation → the first pickling → hollow forging inspection → cold rolling/first cold-drawn → the first degreasing → the first thermal treatment → the first aligning Pipe Cutting → the second pickling → the second cold-drawn → the second degreasing → the second thermal treatment → the second aligns Pipe Cutting → the 3rd pickling → three degreasing → intermediate survey → assembled watch inspection → hydraulic pressure → UT (Ultrasonic Testing) → eddy current test → size/surface examination → spray mark → clean → packaging → transport;
Heating steps: Heating temperature is 1170 DEG C, heat-up time is 16 hours;
Cold rolling/first cold-drawn step: adopt three roller finishing mill sizes of pipe and tubing to control, the deviation control of production tube external diameter, wall thickness dimension ± 0.03mm, surfaces externally and internally roughness≤0.8um;
First heat treatment step: preheating temperature is: 865 DEG C, Heating temperature is: 1190 DEG C, and soaking temperature is: 1050 DEG C;
Second heat treatment step: for the thermal treatment of bend pipe and elbow, the ratio R/D=1.8 of the minimum bending radius of bend pipe and tube outer diameter, bend pipe ovality is 5.3%, and pipe leg spacing minimum deviation controls at ± 1.5mm, and elbow subtracts wall 15%, and Heating temperature is 950 DEG C.
Wherein, heating steps and the first heat treatment step adopt stove at the bottom of Sweet natural gas Continuous Roller or the solid smelting furnace of continous way light, with the water cooling rapidly of the speed of 15 DEG C/s after the first heat treatment step heating; Second heat treatment step adopts intermediate frequency contact heating bend pipe and elbow, and adopts infrared measurement of temperature control temperature.
embodiment 3
The present embodiment provides a kind of 06Cr17Ni12Mo2Ti austenitic stainless steel pipe, and its chemical composition and mass percent are: C:0.022%, Si:0.63%, Mn:1.89%, Cr:17.2%, Ni:12.0%, Mo:2.44%, Cu:0.8%, Al:0.23%, N:0.08%, Ca:0.12%, Se:0.056%, Te:0.017%, Ti:0.53%, S:0.014%, P:0.009%, rare earth element: 0.16%, all the other are Fe and inevitable impurity; Rare earth element comprises: the europium of 16%, the samarium of 10%, 26% praseodymium, the neodymium of 13%, the samarium of 6%, all the other are lanthanum.
The present embodiment also provides a kind of production technique of 06Cr17Ni12Mo2Ti austenitic stainless steel pipe, and its operational path is: refining pipe → inspection → peeling sawing → heating → perforation → the first pickling → hollow forging inspection → cold rolling/first cold-drawn → the first degreasing → the first thermal treatment → the first aligning Pipe Cutting → the second pickling → the second cold-drawn → the second degreasing → the second thermal treatment → the second aligns Pipe Cutting → the 3rd pickling → three degreasing → intermediate survey → assembled watch inspection → hydraulic pressure → UT (Ultrasonic Testing) → eddy current test → size/surface examination → spray mark → clean → packaging → transport;
Heating steps: Heating temperature is 1160 DEG C, heat-up time is 17 hours;
Cold rolling/first cold-drawn step: adopt three roller finishing mill sizes of pipe and tubing to control, the deviation control of production tube external diameter, wall thickness dimension ± 0.03mm, surfaces externally and internally roughness≤0.8um;
First heat treatment step: preheating temperature is: 855 DEG C, Heating temperature is: 1185 DEG C, and soaking temperature is: 1040 DEG C;
Second heat treatment step: for the thermal treatment of bend pipe and elbow, the ratio R/D=1.5 of the minimum bending radius of bend pipe and tube outer diameter, bend pipe ovality is 6.2%, and pipe leg spacing minimum deviation controls at ± 1.5mm, and elbow subtracts wall 13%, and Heating temperature is 1000 DEG C.
Wherein, heating steps and the first heat treatment step adopt stove at the bottom of Sweet natural gas Continuous Roller or the solid smelting furnace of continous way light, with the water cooling rapidly of the speed of 13 DEG C/s after the first heat treatment step heating; Second heat treatment step adopts intermediate frequency contact heating bend pipe and elbow, and adopts infrared measurement of temperature control temperature.
Above embodiment is only and technological thought of the present invention is described, can not limit protection scope of the present invention with this, and every technological thought proposed according to the present invention, any change that technical scheme basis is done, all falls within scope.
Claims (7)
1. a 06Cr17Ni12Mo2Ti austenitic stainless steel pipe, it is characterized in that, its chemical composition and mass percent are: C:0.021-0.023%, Si:0.62-0.64%, Mn:1.88-1.90%, Cr:17.1-17.3%, Ni:11.9-12.1%, Mo:2.43-2.45%, Cu:0.7-0.9%, Al:0.22-0.24%, N:0.07-0.09%, Ca:0.11-0.13%, Se:0.055-0.057%, Te:0.016-0.018%, Ti:0.13-0.7%, S:0.013-0.015%, P:0.008-0.010%, rare earth element: 0.15-0.17%, all the other are Fe and inevitable impurity,
Described rare earth element comprises: the praseodymium of the europium of 15-17%, the samarium of 9-11%, 25-27%, the neodymium of 12-14%, the samarium of 5-7%, and all the other are lanthanum.
2. 06Cr17Ni12Mo2Ti austenitic stainless steel pipe according to claim 1, is characterized in that, its chemical composition and mass percent are: C:0.021%, Si:0.62%, Mn:1.88%, Cr:17.1%, Ni:11.9%, Mo:2.43%, Cu:0.7%, Al:0.22%, N:0.07%, Ca:0.11%, Se:0.055%, Te:0.016%, Ti:0.13%, S:0.013%, P:0.008%, rare earth element: 0.15%, all the other are Fe and inevitable impurity;
Described rare earth element comprises: the europium of 15%, the samarium of 9%, 25% praseodymium, the neodymium of 12%, the samarium of 5%, all the other are lanthanum.
3. 06Cr17Ni12Mo2Ti austenitic stainless steel pipe according to claim 1, is characterized in that, its chemical composition and mass percent are: C:0.023%, Si:0.64%, Mn:1.90%, Cr:17.3%, Ni:12.1%, Mo:2.45%, Cu:0.9%, Al:0.24%, N:0.09%, Ca:0.13%, Se:0.057%, Te:0.018%, Ti:0.7%, S:0.015%, P:0.010%, rare earth element: 0.17%, all the other are Fe and inevitable impurity;
Described rare earth element comprises: the europium of 17%, the samarium of 11%, 27% praseodymium, the neodymium of 14%, the samarium of 7%, all the other are lanthanum.
4. 06Cr17Ni12Mo2Ti austenitic stainless steel pipe according to claim 1, is characterized in that, its chemical composition and mass percent are: C:0.022%, Si:0.63%, Mn:1.89%, Cr:17.2%, Ni:12.0%, Mo:2.44%, Cu:0.8%, Al:0.23%, N:0.08%, Ca:0.12%, Se:0.056%, Te:0.017%, Ti:0.53%, S:0.014%, P:0.009%, rare earth element: 0.16%, all the other are Fe and inevitable impurity;
Described rare earth element comprises: the europium of 16%, the samarium of 10%, 26% praseodymium, the neodymium of 13%, the samarium of 6%, all the other are lanthanum.
5. based on the production technique of the 06Cr17Ni12Mo2Ti austenitic stainless steel pipe described in claim 1-4, its operational path is: refining pipe → inspection → peeling sawing → heating → perforation → the first pickling → hollow forging inspection → cold rolling/first cold-drawn → the first degreasing → the first thermal treatment → the first aligning Pipe Cutting → the second pickling → the second cold-drawn → the second degreasing → the second thermal treatment → the second aligns Pipe Cutting → the 3rd pickling → three degreasing → intermediate survey → assembled watch inspection → hydraulic pressure → UT (Ultrasonic Testing) → eddy current test → size/surface examination → spray mark → clean → packaging → transport,
It is characterized in that:
Described heating steps: Heating temperature is 1150-1170 DEG C, heat-up time is 16-18 hour;
Described cold rolling/the first cold-drawn step: adopt three roller finishing mill sizes of pipe and tubing to control, the deviation control of production tube external diameter, wall thickness dimension ± 0.03mm, surfaces externally and internally roughness≤0.8um;
Described first heat treatment step: preheating temperature is: 845-865 DEG C, Heating temperature is: 1180-1190 DEG C, and soaking temperature is: 1030-1050 DEG C;
Described second heat treatment step: for the thermal treatment of bend pipe and elbow, the ratio R/D=1.2-1.8 of the minimum bending radius of bend pipe and tube outer diameter, bend pipe ovality is 5.3-7%, and pipe leg spacing minimum deviation controls at ± 1.5mm, elbow subtracts wall 11-15%, and Heating temperature is 950-1050 DEG C.
6. the production technique of 06Cr17Ni12Mo2Ti austenitic stainless steel pipe according to claim 5, it is characterized in that, described heating steps and the first heat treatment step adopt stove at the bottom of Sweet natural gas Continuous Roller or the solid smelting furnace of continous way light, with the water cooling rapidly of the speed of 11-15 DEG C/s after the first heat treatment step heating.
7. the production technique of 06Cr17Ni12Mo2Ti austenitic stainless steel pipe according to claim 5, is characterized in that, described second heat treatment step adopts intermediate frequency contact heating bend pipe and elbow, and adopts infrared measurement of temperature control temperature.
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