CN112647025A - Manufacturing process of high-performance stainless steel pipe - Google Patents
Manufacturing process of high-performance stainless steel pipe Download PDFInfo
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- CN112647025A CN112647025A CN202011484579.5A CN202011484579A CN112647025A CN 112647025 A CN112647025 A CN 112647025A CN 202011484579 A CN202011484579 A CN 202011484579A CN 112647025 A CN112647025 A CN 112647025A
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- stainless steel
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- steel pipe
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/10—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
- C21D8/105—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies of ferrous alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention discloses a manufacturing process of a high-performance stainless steel pipe, which consists of the following components in percentage by mass: 0.025-0.028% of C, 0.020-0.030% of P, less than or equal to 0.020% of S, 9-10% of Ni, 18.5-20% of Cr, less than or equal to 0.30% of Cu, 0.05-0.10% of N, wherein the Cr adopts 304LD Cr or 316LD Cr and has the mass fraction of 16.5-18.5%, and the Cr adopts 304LD Ni or 316LD Ni and has the mass fraction of 11-14%. The manufacturing process of the high-performance stainless steel pipe strictly controls the chemical components, reasonably arranges the steel pipe production process and strictly controls the heat treatment system of the finished product, although the cost of the stainless steel pipe is increased by about 10 percent, the service life of heat exchanger equipment is theoretically prolonged, thereby improving the production efficiency, saving resources and further laying a good foundation for reducing the cost in the future.
Description
Technical Field
The invention relates to the technical field of stainless steel pipes, in particular to a manufacturing process of a high-performance stainless steel pipe.
Background
The stainless steel pipe is a hollow long-strip cylindrical steel, and the application range of the stainless steel pipe is used as a pipeline for conveying fluid, and the stainless steel pipe is mainly widely used for industrial conveying pipelines, mechanical structural parts and the like in petroleum, chemical engineering, medical treatment, food, light industry, mechanical instruments and the like. The stainless steel pipe is made of acid-resistant and heat-resistant steel billets through heating, perforating, sizing, hot rolling and cutting.
Classifying stainless steel pipes: stainless steel seamless steel pipes and stainless steel welded steel pipes (seamed steel pipes) are two basic categories. The steel pipe can be divided into round pipe and special pipe according to the external diameter shape of the steel pipe, and the steel pipe is widely used for round steel pipes, but also has special-shaped steel pipes such as square, rectangle, semicircle, hexagon, equilateral triangle, octagon and the like.
The steel pipes bearing fluid pressure are subjected to hydraulic tests and radiographic inspection to check the pressure resistance and quality, the steel pipes are qualified without leakage, wetting or expansion under specified pressure, and some steel pipes are subjected to a crimping test, a flaring test, a flattening test and the like according to standards or requirements.
Seamless stainless steel pipes, also known as seamless stainless steel pipes, are produced by piercing steel ingots or solid pipe blanks into tubular blanks, and then hot rolling, cold rolling or cold drawing. The specification of seamless steel pipes is expressed in external diameter x wall thickness mm.
In order to prolong the service life of stainless steel when heat exchanger equipment is used, improve production efficiency and save resources, a manufacturing process of a high-performance stainless steel pipe is provided.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a manufacturing process of a high-performance stainless steel pipe, and the invention provides the following technical scheme: a manufacturing process of a high-performance stainless steel pipe comprises the following components in parts by mass: 0.025 to 0.028 percent of C, 0.020 to 0.030 percent of P, less than or equal to 0.020 percent of S, 9 to 10 percent of Ni, 18.5 to 20 percent of Cr, less than or equal to 0.30 percent of Cu and 0.05 to 0.10 percent of N.
Preferably, the Cr is 304LD Cr or 316LD Cr, and the mass fraction of the Cr is 16.5-18.5%.
Preferably, Ni of 304LD or Ni of 316LD is used as Cr, and the mass fraction of the Ni is 11-14%.
The manufacturing process of the high-performance stainless steel pipe is characterized by comprising the following steps:
step one, processing a tube blank;
step two, heating the tube blank;
step three, perforating the tube blank;
step four, acid washing;
step five, checking and grinding;
step six, cold rolling;
seventhly, deoiling;
step eight, heat treatment;
step nine, straightening and pickling;
tenth, heading, lubricating and cold drawing;
eleven, secondary deoiling;
step twelve, secondary heat treatment;
thirteen, straightening, pipe cutting and acid washing;
and step fourteen, performing physical and chemical inspection, performing nondestructive detection, packaging and warehousing.
Preferably, the pipe with the inner diameter less than or equal to 12mm, the length more than or equal to 5m and the inner diameter less than or equal to 20mm after cold drawing is subjected to head cutting and then deoiling.
Preferably, the control temperature of the 304L and 316L general austenitic steel tubes is as follows: 1070 ℃ and 1080 ℃.
Preferably, the RM of the high-performance stainless steel pipe is 560-630MPa, Rp0.2 is 290-350MPa, and the elongation is as follows: 45-55%, grain size: 7-7.5 grades.
Preferably, the high performance stainless steel pipe is positioned at 19(25) x 2 x 6000 mm.
Preferably, the tensile strengths of the N differ by 10-20 MPa.
Compared with the prior art, the invention has the following beneficial effects: according to the manufacturing process of the high-performance stainless steel pipe, through strictly controlling the chemical components, reasonably arranging the steel pipe production process and strictly controlling the heat treatment system of the finished product, although the cost of the stainless steel pipe is increased by about 10%, the service life of heat exchanger equipment is theoretically prolonged, so that the production efficiency is improved, resources are saved, and a good foundation is laid for further reducing the cost in the future.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention discloses a manufacturing process of a high-performance stainless steel pipe, which consists of the following components in percentage by mass: 0.025 to 0.028 percent of C, 0.020 to 0.030 percent of P, less than or equal to 0.020 percent of S, 9 to 10 percent of Ni, 18.5 to 20 percent of Cr, less than or equal to 0.30 percent of Cu and 0.05 to 0.10 percent of N.
The Cr is 304LD Cr or 316LD Cr, and the mass fraction of the Cr is 16.5-18.5%.
Ni of 304LD or Ni of 316LD is used as Cr, and the mass fraction of the Ni is 11-14%.
A manufacturing process of a high-performance stainless steel pipe comprises the following steps:
step one, processing a tube blank;
step two, heating the tube blank;
step three, perforating the tube blank;
step four, acid washing;
step five, checking and grinding;
step six, cold rolling;
seventhly, deoiling;
step eight, heat treatment;
step nine, straightening and pickling;
tenth, heading, lubricating and cold drawing;
eleven, secondary deoiling;
step twelve, secondary heat treatment;
thirteen, straightening, pipe cutting and acid washing;
and step fourteen, performing physical and chemical inspection, performing nondestructive detection, packaging and warehousing.
For the pipe with the inner diameter less than or equal to 12mm, the length more than or equal to 5m, the inner diameter less than or equal to 20mm and the length more than or equal to 10m after cold drawing, the end of the pipe is cut first and then deoiled.
The typical austenitic steel tube control temperatures of 304L and 316L were: 1070 ℃ and 1080 ℃.
The RM of the high-performance stainless steel pipe is 560-630MPa, Rp0.2 is 290-350MPa, and the elongation is as follows: 45-55%, grain size: 7-7.5 grades.
The high-performance stainless steel pipe has a positioning specification of 19(25) x 2 x 6000 mm.
The tensile strength difference of N is 10-20 MPa.
It is noted that the main properties of the stainless steel pipe are corrosion resistance and high medium temperature strength, and the popular expression is the comprehensive properties such as corrosion resistance of ultra-low carbon and high yield strength, therefore, the raw materials are firstly ensured, and the main element values are strictly controlled; such as C: 0.025% -0.028% by standard: less than or equal to 0.030%, with too low a C content, which has an effect on the tensile strength and the specified plastic elongation strength, we have previously made C: 0.017% of 304L, whose tensile strength and prescribed plastic elongation strength are 515MPa and 207MPa, respectively, so in order to secure the strength, C: 0.025-0.028%.
Wherein P is 0.020-0.030% S: less than or equal to 0.020%
The Cr: the Cr content of 304LD is increased by 0.5 percent to 18.5 percent, namely the Cr content of 304LD is 18.5 percent to 20 percent, the Cr content of 316LD is 16.5 percent to 18.5 percent, which is basically the same as the European Union standard EN10216-5, and the percent of pass of intergranular corrosion is ensured.
The Ni: and the Ni content of 304LD is increased by 1 percent on the basis of the original Ni: 9% -10% Ni of 316 LD: the toughness and the plasticity of the product are further improved by 11% -14%.
The trace elements are controlled correspondingly, such as Cu: less than or equal to 0.30 percent N: 0.05-0.10%, N if below 0.05% has an effect on the mechanical properties, we tested N.ltoreq.0.05% and N: 0.05-0.10%, the tensile strength difference is 10-20MPa, so we control N: 0.05-0.10%
Then controlling non-metal inclusions in the steel:
after the pipe blank is manufactured, the test is repeated, the result accords with the requirement of manufacturing the stainless steel seamless steel pipe, the finished product is phi 19(25) multiplied by 2 multiplied by 6000 in the manufacturing process according to the strict process control, the finished product is directly manufactured by cold rolling, the extension of the cold rolled finished product is properly improved, the foundation is laid for improving the strength and the surface quality, slightly different heat treatment measures are also adopted during heat treatment of the finished product, and the stainless steel seamless steel pipe is rapidly cooled at 1090 ℃. The heat treatment system is specified according to the national standard: 1010 ℃ 1150 ℃, and the control temperature of the general austenitic steel tubes of 304L and 316L is as follows: 1070-: 560-: 45-55% grain size: 7-7.5 grades. Later we tested again the heat treatment at 1100 ℃ and the results: rm: elongation at 510-580MPaRp0.2:210-300 MPa: 50-60% grain size: the surface oxidation is severe after heat treatment at such high temperature of 6-7 grades, and the surface is not smooth after acid cleaning. Therefore, we adopt quick cooling after 1090 ℃, and the performance index data is as follows:
sampling after heat treatment of the finished product: flaring, flattening, room temperature mechanical property, high temperature mechanical property, bending, hardness, intergranular corrosion and the like, wherein more than double of samples are taken from more than 100 steel pipes, and the result is that the room temperature performance Rm: 594MPa598MPa623MPa634MPa642MPa648MPa
Rp0.2:306MPa310MPa340MPa343MPa335MPa345MPa
A：58％58％52％53％54％53％
Flaring, flattening and bending are all qualified; hardness HRB: 78-81
Sensitizing intercrystalline corrosion at 650 ℃ for 2 hours according to GB/T4334E samples, slightly boiling in sulfuric acid-copper sulfate solution for 16 hours, and detecting that the inner and outer curved surfaces are all qualified in a bent 10-time magnifying lens;
the medium and high temperature performance shown in table 1 completely meets the requirements of the enterprise standards and also far exceeds the requirements of the european union standards, further showing that the performance at medium and high temperatures is good and is substantially twice the requirements of the standards.
The ratio of the measured medium-high temperature performance and the domestic and foreign standard data is shown in Table 1;
in conclusion, by strictly controlling the chemical components, reasonably arranging the steel pipe production process and strictly controlling the heat treatment system of the finished product, although the cost of the double-mark steel pipe is increased by about 10 percent, the service life of heat exchanger equipment is theoretically prolonged, so that the production efficiency is improved, the resources are saved, and a good foundation is laid for further reducing the cost in the future.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. A high performance stainless steel pipe which characterized in that: the stainless steel pipe comprises the following components in percentage by mass: 0.025 to 0.028 percent of C, 0.020 to 0.030 percent of P, less than or equal to 0.020 percent of S, 9 to 10 percent of Ni, 18.5 to 20 percent of Cr, less than or equal to 0.30 percent of Cu and 0.05 to 0.10 percent of N.
2. A high performance stainless steel tube according to claim 1, characterized in that: the Cr is 304LD Cr or 316LD Cr, and the mass fraction of the Cr is 16.5-18.5%.
3. A high performance stainless steel tube according to claim 1, characterized in that: ni of 304LD or Ni of 316LD is used as Cr, and the mass fraction of the Ni is 11-14%.
4. A process for manufacturing a high performance stainless steel tube according to claim 1, characterized in that it comprises the following steps:
step one, processing a tube blank;
step two, heating the tube blank;
step three, perforating the tube blank;
step four, acid washing;
step five, checking and grinding;
step six, cold rolling;
seventhly, deoiling;
step eight, heat treatment;
step nine, straightening and pickling;
tenth, heading, lubricating and cold drawing;
eleven, secondary deoiling;
step twelve, secondary heat treatment;
thirteen, straightening, pipe cutting and acid washing;
and step fourteen, performing physical and chemical inspection, performing nondestructive detection, packaging and warehousing.
5. The process of manufacturing a high performance stainless steel tube according to claim 1, wherein: for the pipe with the inner diameter less than or equal to 12mm, the length more than or equal to 5m, the inner diameter less than or equal to 20mm and the length more than or equal to 10m after cold drawing, the end of the pipe is cut first and then deoiled.
6. The process of manufacturing a high performance stainless steel tube according to claim 1, wherein: the typical austenitic steel tube control temperatures of 304L and 316L were: 1070 ℃ and 1080 ℃.
7. The process of manufacturing a high performance stainless steel tube according to claim 1, wherein: the RM of the high-performance stainless steel pipe is 560-630MPa, Rp0.2 is 290-350MPa, and the elongation is as follows: 45-55%, grain size: 7-7.5 grades.
8. The process of manufacturing a high performance stainless steel tube according to claim 1, wherein: the high-performance stainless steel pipe has a positioning specification of 19(25) x 2 x 6000 mm.
9. The process of manufacturing a high performance stainless steel tube according to claim 1, wherein: the tensile strength difference of the N is 10-20 MPa.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011484579.5A CN112647025A (en) | 2020-12-16 | 2020-12-16 | Manufacturing process of high-performance stainless steel pipe |
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| CN202011484579.5A CN112647025A (en) | 2020-12-16 | 2020-12-16 | Manufacturing process of high-performance stainless steel pipe |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09279313A (en) * | 1996-04-15 | 1997-10-28 | Sumitomo Metal Ind Ltd | Stainless steel for exhaust gas system of city waste incineration equipment |
| CN104611624A (en) * | 2007-10-04 | 2015-05-13 | 新日铁住金株式会社 | Austenitic stainless steel |
| CN107779787A (en) * | 2016-08-30 | 2018-03-09 | 浙江大隆合金钢有限公司 | Z2CN19 10NS Nuclear pipings austenitic stainless steels and steel ingot production method |
| JP2018075609A (en) * | 2016-11-09 | 2018-05-17 | コベルコ鋼管株式会社 | Method for thermally processing two-phase stainless steel pipe |
| CN109731943A (en) * | 2018-12-14 | 2019-05-10 | 无锡鑫常钢管有限责任公司 | A kind of large heat exchanger over-long U-shaped stainless steel tube and its manufacturing method |
| WO2020054999A1 (en) * | 2018-09-13 | 2020-03-19 | 주식회사 포스코 | Austenitic stainless steel having excellent pipe-expandability and age cracking resistance |
| CN111963805A (en) * | 2020-08-17 | 2020-11-20 | 无锡鑫常钢管有限责任公司 | High-strength anti-corrosion U-shaped stainless steel pipe for heat exchanger and preparation method |
-
2020
- 2020-12-16 CN CN202011484579.5A patent/CN112647025A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09279313A (en) * | 1996-04-15 | 1997-10-28 | Sumitomo Metal Ind Ltd | Stainless steel for exhaust gas system of city waste incineration equipment |
| CN104611624A (en) * | 2007-10-04 | 2015-05-13 | 新日铁住金株式会社 | Austenitic stainless steel |
| CN107779787A (en) * | 2016-08-30 | 2018-03-09 | 浙江大隆合金钢有限公司 | Z2CN19 10NS Nuclear pipings austenitic stainless steels and steel ingot production method |
| JP2018075609A (en) * | 2016-11-09 | 2018-05-17 | コベルコ鋼管株式会社 | Method for thermally processing two-phase stainless steel pipe |
| WO2020054999A1 (en) * | 2018-09-13 | 2020-03-19 | 주식회사 포스코 | Austenitic stainless steel having excellent pipe-expandability and age cracking resistance |
| CN109731943A (en) * | 2018-12-14 | 2019-05-10 | 无锡鑫常钢管有限责任公司 | A kind of large heat exchanger over-long U-shaped stainless steel tube and its manufacturing method |
| CN111963805A (en) * | 2020-08-17 | 2020-11-20 | 无锡鑫常钢管有限责任公司 | High-strength anti-corrosion U-shaped stainless steel pipe for heat exchanger and preparation method |
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Application publication date: 20210413 |
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