CN113817956A - 700 MPa-level economical seamless gas cylinder steel pipe and manufacturing method thereof - Google Patents
700 MPa-level economical seamless gas cylinder steel pipe and manufacturing method thereof Download PDFInfo
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- CN113817956A CN113817956A CN202110882197.6A CN202110882197A CN113817956A CN 113817956 A CN113817956 A CN 113817956A CN 202110882197 A CN202110882197 A CN 202110882197A CN 113817956 A CN113817956 A CN 113817956A
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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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
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- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/28—Normalising
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- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/002—Heat treatment of ferrous alloys containing Cr
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- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
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- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
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- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
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- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
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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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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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
-
- 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
- C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium with copper
-
- 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
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
-
- 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
-
- 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
-
- 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
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
Abstract
The invention discloses a production method of a 700 MPa-level economical seamless gas cylinder steel pipe, belonging to the technical field of metallurgy and forming, wherein the pipe blank comprises the following chemical components in percentage by weight: c0.34-0.38; si0.17-0.30; mn1.55-1.70; p is less than or equal to 0.015; s is less than or equal to 0.010; 0.15 to 0.25 of Cr0; al0.020-0.045; ni is less than 0.10; cu is less than 0.10; the balance of matrix Fe and undetected trace impurity elements. The process flow comprises the following steps: round continuous casting blank → cut to length → tube blank heating → mushroom type perforation → continuous rolled tube of PQF unit → micro tension sizing → straightening with temperature → cooling bed cooling → cut to length sawing → hydrostatic test → ultrasonic wave + nondestructive inspection → normalizing heat treatment; the product of the invention has the characteristics of low production cost, less impurity content, high dimensional precision and good matching of toughness and toughness.
Description
Technical Field
The invention relates to the field of ferrous metal smelting and metal pressure processing, in particular to a 700 MPa-level economical seamless gas cylinder steel pipe and a manufacturing method thereof.
Background
In recent years, along with the development of economy, the design wall thickness of the high-pressure gas cylinder is greatly reduced, so that the light weight of the high-pressure gas cylinder is realized, the resources are saved, the loss in the transportation and carrying processes is reduced, the most important is that the gas loading capacity of a single high-pressure gas cylinder is greatly improved, and favorable conditions are provided for the use of gas.
Aiming at the change of the standard of the gas cylinder, the carbon chemical element component range of 37Mn steel related in the national standard GB/T18248-2008 can not meet the requirements of downstream users, the carbon element component range is adjusted to 0.34% -0.38% in the seamless steel tube for the gas cylinder (a request draft) of the new standard GB/T18248-2020, the upper limit of the carbon element range is reduced by 0.2% compared with the original range, the yield strength of the steel tube after normalizing heat treatment can hardly meet the requirements of users on 520MPa or above, and the tensile strength reaches above 730 MPa.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a method for manufacturing a 700 MPa-grade economical seamless gas cylinder steel tube, which has low production cost and high dimensional precision, and the product performance after normalizing heat treatment meets the requirements of users.
In order to solve the technical problems, the invention adopts the following technical scheme:
a700 MPa-level economical seamless gas cylinder steel pipe comprises the following chemical components in percentage by mass: 0.34 to 0.38 percent of C; si0.17-0.30%; 1.55 to 1.70 percent of Mn1; p is less than or equal to 0.015 percent; s is less than or equal to 0.010 percent; 0.15 to 0.25 percent of Cr0; al0.020-0.045%; ni is less than 0.10 percent; cu is less than 0.10 percent; the balance of Fe and inevitable impurities; the mechanical properties are as follows: yield strength: 530 to 560 MPa; tensile strength: 760 to 795 MPa; yield ratio: less than or equal to 0.75; elongation percentage: not less than 20 percent; -transverse impact value at 20 ℃: aKV is more than or equal to 20J/cm 2; grain size: not less than 8.0 grade.
A manufacturing method of a 700 MPa-level economical seamless gas cylinder steel pipe comprises the following steps:
the method comprises the steps of heating a continuous casting blank by using a round continuous casting blank, perforating and continuously rolling the heated blank to form a continuously rolled tube, sizing the rolled tube, straightening with temperature, cooling in a cooling bed, carrying out sizing and sawing, sequentially carrying out hydrostatic test and nondestructive inspection detection, and finally carrying out normalizing heat treatment.
Further, the process flow is briefly described as follows: round continuous casting blank → cut to length → heating of pipe blank → mushroom type perforation → PQF hot continuous rolling pipe → micro tension sizing → straightening with temperature → cooling bed cooling → cut to length sawing → hydrostatic test → nondestructive testing → normalizing heat treatment.
Further, the production process of the continuous casting round pipe blank is as follows:
chemical component assay is carried out on the tube blank, and the chemical components of the tube blank meet the following requirements: 0.34 to 0.38 percent of C; si0.17-0.30%; 1.55 to 1.70 percent of Mn1; p is less than or equal to 0.015 percent; s is less than or equal to 0.010 percent; 0.15 to 0.25 percent of Cr0; al0.020-0.045%; ni is less than 0.10 percent; cu is less than 0.10 percent; the balance of Fe and inevitable impurities;
and (3) making the continuous casting round pipe blank which is qualified in component test and has the sulfur mark not more than 1.5 grade into a pipe, wherein the pipe making process comprises the following steps:
putting the tube blank into a heating furnace for heating, continuously checking and controlling the temperature of a preheating section, a heating section and a soaking section of the heating furnace, wherein the control range of the temperature of each section is shown in the table:
the temperature of each section of the heating furnace is automatically controlled and recorded by a microcomputer;
and (3) after the heated tube blank is perforated, continuously rolling the tube blank in a corresponding PQF tube rolling unit, and then carrying out micro-tension sizing, straightening with temperature, cooling by a cooling bed and cutting to length to form the seamless steel tube with the specification required by a user. During rolling, each batch of steel pipes is subjected to at least one-time thermal sampling, the geometric dimension is checked, and the accurate forming of the steel pipes is guaranteed.
And then carrying out hydrostatic test and nondestructive inspection on the steel pipes one by one, and carrying out normalizing heat treatment on qualified steel pipes.
Further, the normalizing heat treatment comprises heating to 860 ℃ and keeping the temperature for 30 minutes, discharging from the furnace and air cooling.
Compared with the prior art, the invention has the beneficial technical effects that:
adopting a series of technical measures of scientific heating temperature, mature pipe rolling process, accurate forming of steel pipes, straightening of the steel pipes with temperature above 550 ℃ and the like; a series of technical measures such as continuous casting round pipe billet, bacterial type perforation, PQF continuous pipe rolling, micro-tension diameter reduction, steel pipe straightening with temperature and whole-process online detection are adopted, so that the size precision of the steel pipe is relatively high;
the steel pipe has the advantages that the steel pipe is excellent in various performances due to the unique component design of the element Cr, the mature pipe rolling process and the straightening with temperature, and the specific performance indexes are as follows:
yield strength: 530 to 560 MPa; tensile strength: 760 to 795 MPa; yield ratio: less than or equal to 0.75; elongation percentage: not less than 20 percent; -transverse impact value at 20 ℃: aKV is more than or equal to 20J/cm 2; grain size: not less than 8.0 grade.
Detailed Description
The present invention will be described in further detail with reference to examples 1 to 3.
The production process flow sequence is round continuous casting blank → fixed length cutting → pipe blank heating → mushroom type perforation → PQF hot continuous rolling pipe → micro-expansion force sizing → band temperature straightening → cooling bed cooling → fixed length sawing → hydrostatic test → nondestructive testing → heat treatment.
The specific production process flow is briefly described as follows:
to the specification of
The round tube blank is sampled and examined, and the chemical component test results (weight percentage content) are shown in table 1.
TABLE 1 chemical composition test results (wt%) of tube blanks
| C | Si | Mn | P | S | Cr | Al | Ni | Cu | |
| Example 1 | 0.36 | 0.20 | 1.66 | 0.013 | 0.005 | 0.17 | 0.038 | 0.005 | 0.005 |
| Example 2 | 0.35 | 0.23 | 1.57 | 0.012 | 0.006 | 0.20 | 0.025 | 0.005 | 0.005 |
| Example 3 | 0.37 | 0.25 | 1.60 | 0.016 | 0.005 | 0.18 | 0.022 | 0.005 | 0.005 |
And (4) sulfur printing: all the products do not exceed 1.0 grade, and the products are qualified through low-power inspection.
The standard of the will-be-verified and qualified is
The tube blank is made into a tube, and the tube making process is as follows:
will be specified as
The tube blank is put into an annular heating furnace for heating, the temperature of each section of a preheating section, a heating section, a soaking section and the like of the annular heating furnace is continuously checked and controlled, the thorough and uniform heating is ensured, and the temperature control range of each section is shown in a table 2;
TABLE 2 temperature control (. degree. C.) of each stage of the annular furnace
| Preheating I section | Preheating stage II | Heating stage I | Heating stage II | Soaking section I | Soaking II section |
| 800～1000 | 1000～1150 | 1150～1250 | 1220～1260 | 1240～1280 | 1240～1280 |
The temperature of each section of the annular heating furnace is automatically controlled and recorded by a microcomputer.
The hot tool must be measured before use, and the roller way must be checked and processed before rolling, so as to avoid scratching the pipe wall.
The heated specification is
The tube blank is subjected to bacterial perforation and then to
Continuously rolling on a tube rolling mill set, and then sizing and making into a tube with a specification
The seamless steel pipe of (1) is subjected to thermal sampling once per batch, and the geometric dimension is checked.
And when the temperature of the seamless steel pipe is reduced to 517 ℃, straightening is carried out.
The specification of the production process is
The seamless steel pipe is subjected to nondestructive flaw detection and hydrostatic test in sequence, and the qualified seamless steel pipe is subjected to normalizing heat treatment, namely heated to 860 ℃ and kept warm for 30 minutes and then taken out of the furnace for air cooling. The prepared sample is used for testing the mechanical property and the metallographic property.
The specifications of the products produced in the examples 1 to 3 are verified to be
The results of the mechanical property test and the metallographic property test of the seamless steel tube are shown in Table 3 and Table 4.
TABLE 3 mechanical Property test results of seamless steel pipes
| Rt0.5(MPa) | Rm(MPa) | Rt0.5/Rm | A(％) | aKV(-20 ℃, transverse, J/cm)2) | |
| Example 1 | 542 | 754 | 0.71 | 25.0 | 36 |
| Example 2 | 550 | 761 | 0.72 | 24.0 | 40 |
| Example 3 | 559 | 780 | 0.71 | 22.0 | 32 |
TABLE 4 metallographic examination of the seamless steel tubes (grade)
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (5)
1. The utility model provides a 700MPa level economical seamless gas cylinder steel pipe which characterized in that: the chemical components of the material comprise the following components in percentage by mass: 0.34 to 0.38 percent of C; si 0.17-0.30%; 1.55 to 1.70 percent of Mn; p is less than or equal to 0.015 percent; s is less than or equal to 0.010 percent; 0.15 to 0.25 percent of Cr; 0.020-0.045% of Al; ni is less than 0.10 percent; cu is less than 0.10 percent; the balance of Fe and inevitable impurities; the mechanical properties are as follows: yield strength: 530 to 560 MPa; tensile strength: 760 to 795 MPa; yield ratio: less than or equal to 0.75; elongation percentage: not less than 20 percent; -transverse impact value at 20 ℃: aKV is more than or equal to 20J/cm 2; grain size: not less than 8.0 grade.
2. The manufacturing method of the 700 MPa-level economical seamless gas cylinder steel tube according to claim 1, characterized in that: the method comprises the following steps:
the method comprises the steps of heating a continuous casting blank by using a round continuous casting blank, perforating and continuously rolling the heated blank to form a continuously rolled tube, sizing the rolled tube, straightening with temperature, cooling in a cooling bed, carrying out sizing and sawing, sequentially carrying out hydrostatic test and nondestructive inspection detection, and finally carrying out normalizing heat treatment.
3. The manufacturing method according to claim 2, characterized in that: the process flow is briefly described as follows: round continuous casting blank → cut to length → heating of pipe blank → mushroom type perforation → PQF hot continuous rolling pipe → micro tension sizing → straightening with temperature → cooling bed cooling → cut to length sawing → hydrostatic test → nondestructive testing → normalizing heat treatment.
4. The manufacturing method according to claim 3, characterized in that: the production process of the continuous casting round pipe blank is as follows:
chemical component assay is carried out on the tube blank, and the chemical components of the tube blank meet the following requirements: 0.34 to 0.38 percent of C; si 0.17-0.30%; 1.55 to 1.70 percent of Mn; p is less than or equal to 0.015 percent; s is less than or equal to 0.010 percent; 0.15 to 0.25 percent of Cr; al0.020-0.045%; ni is less than 0.10 percent; cu is less than 0.10 percent; the balance of Fe and inevitable impurities;
and (3) making the continuous casting round pipe blank which is qualified in component test and has the sulfur mark not more than 1.5 grade into a pipe, wherein the pipe making process comprises the following steps:
putting the tube blank into a heating furnace for heating, continuously checking and controlling the temperature of a preheating section, a heating section and a soaking section of the heating furnace, wherein the control range of the temperature of each section is shown in the table:
The temperature of each section of the heating furnace is automatically controlled and recorded by a microcomputer;
after punching the heated tube blank, continuously rolling the tube blank in a corresponding PQF tube rolling unit, and then carrying out micro-tension sizing, straightening with temperature, cooling by a cooling bed and cutting to length to form a seamless steel tube with the specification required by a user; during rolling, at least once thermal sampling is carried out on each batch, the geometric dimension is checked, and the accurate forming of the steel pipe is ensured;
and then carrying out hydrostatic test and nondestructive inspection on the steel pipes one by one, and carrying out normalizing heat treatment on qualified steel pipes.
5. The manufacturing method according to claim 4, characterized in that: the normalizing heat treatment comprises heating to 860 ℃ and keeping the temperature for 30 minutes, discharging from the furnace and air cooling.
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