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Stainless steel pipe and preparation method thereof

A technology of stainless steel pipes and manufacturing methods, applied in the field of manufacturing stainless steel pipes, capable of solving problems such as obstacles

Inactive Publication Date: 2012-03-07
辛培兴
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Considering the restrictions on the transportation and storage of steel pipes, a wide storage space is required due to the limitation of stacking height. In addition, in order to perform heat treatment within a limited time after pipe production, it is necessary to adjust the process from pipe production to heat treatment. There are many obstacles in the whole manufacturing process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The chemical composition weight percentage of the steel pipe manufactured in this example is: C: 0.25%, Si: 0.40%, Co: 0.93%, P: 0.012% S: 0.0023% Cr: 13.9%, Zn: 0.43% Al: 0.0025%, N : 0.033%, Cu: 0.21% Zr: 0.040, and the balance is Fe and inevitable impurities.

[0015] The chemical composition of the steel pipe also includes Mo: 0.046%, Nb: 0.008%.

[0016] The Al content in the chemical composition of the steel pipe is Al: 0.043%, and the final temperature is 950°C.

[0017] A manufacturing method of stainless steel pipe:

[0018] (1) the raw material will be melted by continuous casting method according to the chemical composition of claim 1, and molten iron will be poured into the mold, and after the above-mentioned continuous casting billet is cooled, it will be heated in a high-frequency heating furnace, and the furnace temperature is 1290 ° C , Hot centering temperature 1230 ℃, hot piercing temperature 1223 ℃, continuous rolling temperature 1080 ℃, sizing temp...

Embodiment 2

[0021] The chemical composition weight percentage of the steel pipe manufactured in this example is C: 0.19%, Si: 0.21%, Co: 0.47%, P: 0.010% S: 0.0021% Cr: 11.85%, Zn: 0.23% Al: 0.0009%, N: 0.018%, Cu: 0.22% Zr: 0.043%, and the balance is Fe and inevitable impurities.

[0022] The chemical composition of the steel pipe further includes Mo: 0.02%, V: 0.06%.

[0023] The Al content in the chemical composition of the steel pipe is Al: 0.008%, and the final temperature is 865°C.

[0024] A manufacturing method of stainless steel pipe:

[0025] (1) the raw material will be melted by the continuous casting method according to the chemical composition of claim 1, and the molten iron will be poured into the mold, and after the above-mentioned continuous casting billet is cooled, it will be heated in a high-frequency heating furnace, and the furnace temperature is 1265 ° C. , Hot centering temperature 1200 ℃, hot piercing temperature 1210 ℃, continuous rolling temperature 1000 ℃, si...

Embodiment 3

[0028] The chemical composition weight percentage of the steel pipe manufactured in this example is C: 0.21%, Si: 0.29%, Co: 0.75%, P: 0.011% S: 0.0019% Cr: 12.2%, Zn: 0.33% Al: 0.0019%, N: 0.028%, Cu: 0.20% Zr: 0.037%, and the balance is Fe and inevitable impurities.

[0029] The chemical composition of the steel pipe also includes Nb: 0.005%, V: 0.09%.

[0030] The Al content in the chemical composition of the steel pipe is Al: 0.031%, and the final temperature is 885°C.

[0031] A manufacturing method of stainless steel pipe:

[0032] (1) the raw material will be melted by continuous casting method according to the chemical composition of claim 1, and molten iron will be poured into the mold, and after the above-mentioned continuous casting billet is cooled, it will be heated in an intermediate frequency heating furnace, and the furnace temperature is 1285 ℃, The hot centering temperature is 1233°C, the hot piercing temperature is 1219°C, the continuous rolling temperatur...

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Abstract

The invention discloses a preparation process of a stainless steel pipe. The preparation process comprises the following steps of: (1) casting to obtain a continuous casting billet; heating the continuous casting billet, performing thermal centering, performing thermal punching, performing continuous rolling, and sizing; performing air cooling to the steel pipe obtained through the working procedures to the room temperature, and then sawing; and (2) performing heat treatment, namely adopting the quenching-and-tempering heat treatment process, wherein the quenching medium is water and tempering adopts air cooling; and straightening after the heat treatment of the sleeve and finally performing flaw detection. Through inspections, the stainless steel pipe with the following good performances is selected: the yield strength is 1345MPa; the tensile strength is 1235MPa; in the aspect of the impact toughness, the longitudinal full-scale charpy impact energy is 150J and the transverse full-scale charpy impact energy is 125J; and the elongation rate is 19% and the grain size reaches the grade 9.5. The improved process basically solves the existing problems and ensures that the field related to the high standard steel pipe has an obvious leap, thus the stainless steel pipe and the preparation method thereof have better practical prospects.

Description

technical field [0001] The invention relates to a martensitic stainless steel pipe, in particular to a manufacturing method of the stainless steel pipe. Background technique [0002] Martensitic seamless stainless steel pipe has high processing hardness and good corrosion resistance. It is suitable for high-stress heat-resistant parts, as well as parts that require corrosion resistance in food processing machinery. It is also suitable for daily necessities such as heating pipes. It has a wide range of applications and has a good market prospect. However, the production of martensitic seamless stainless steel pipes is difficult. [0003] There are two production methods for martensitic seamless stainless steel pipes currently on the market. One of them is to drill the martensitic round steel directly without heating to produce martensitic stainless steel pipes. The martensitic stainless steel pipe produced in this way not only wastes a lot of materials, but also has poor s...

Claims

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Application Information

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IPC IPC(8): C22C38/30C21D8/10
Inventor 辛培兴
Owner 辛培兴
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