CN113817956B - 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 PDF

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CN113817956B
CN113817956B CN202110882197.6A CN202110882197A CN113817956B CN 113817956 B CN113817956 B CN 113817956B CN 202110882197 A CN202110882197 A CN 202110882197A CN 113817956 B CN113817956 B CN 113817956B
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CN113817956A (en
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余泽金
张昭
姜海龙
郭志文
张行刚
许占海
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Baotou Iron and Steel Group Co Ltd
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    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/02Ferrous alloys, e.g. steel alloys containing silicon
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21CMANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06Manufacture 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
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D1/00General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/26Methods of annealing
    • C21D1/28Normalising
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D6/00Heat treatment of ferrous alloys
    • C21D6/002Heat treatment of ferrous alloys containing Cr
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D6/00Heat treatment of ferrous alloys
    • C21D6/004Heat treatment of ferrous alloys containing Cr and Ni
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D6/00Heat treatment of ferrous alloys
    • C21D6/005Heat treatment of ferrous alloys containing Mn
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D6/00Heat treatment of ferrous alloys
    • C21D6/008Heat treatment of ferrous alloys containing Si
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D9/00Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/08Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/06Ferrous alloys, e.g. steel alloys containing aluminium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/20Ferrous alloys, e.g. steel alloys containing chromium with copper
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/38Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/42Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/58Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
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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

700 MPa-level economical seamless gas cylinder steel pipe and manufacturing method thereof
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%; 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:
Figure BDA0003192774750000021
Figure BDA0003192774750000031
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, 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.
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
Figure BDA0003192774750000041
The round tube blank is sampled and examined, and the chemical composition 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
Figure BDA0003192774750000042
The tube blank is made into a tube, and the tube making process is as follows:
will be specified as
Figure BDA0003192774750000043
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
Figure BDA0003192774750000044
The tube blank is subjected to bacterial perforation and then to
Figure BDA0003192774750000045
Continuously rolling on a tube rolling mill set, and then sizing and making into a tube with a specification
Figure BDA0003192774750000046
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
Figure BDA0003192774750000047
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
Figure BDA0003192774750000048
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
R t0.5 (MPa) R m (MPa) R t0.5 /R m A(%) a KV (-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)
Figure BDA0003192774750000051
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 (2)

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<0.10%;Cu<0.10 percent; the balance of Fe and inevitable impurities; has the mechanical properties of: yield strength: 530 to 560 MPa; tensile strength: 760 to 795 MPa; yield ratio: less than or equal to 0.75; elongation percentage: more than or equal to 20 percent; -transverse impact value at 20 ℃: aKV is more than or equal to 20J/cm 2 (ii) a Grain size: grade 8.0 or more;
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;
the production process of the continuous casting round pipe blank is as follows:
the chemical composition assay is carried out on the tube blank, and the chemical composition of the tube blank meets 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; 0.020-0.045% of Al; ni < 0.10%; cu < 0.10%; 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 as follows: preheating a section I: 800-1050 ℃; preheating a section II: 1000-1120 ℃; heating the I section: 1150-1230 ℃; heating in a second stage: 1220-1250 ℃; soaking I section: 1240-1260 ℃; soaking II: 1240-1270 ℃;
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;
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;
the normalizing heat treatment comprises heating to 860 ℃ and keeping the temperature for 30 minutes, discharging from the furnace and air cooling.
2. The manufacturing method of the 700 MPa-level economical seamless gas cylinder steel tube according to claim 1, 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;
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; 0.020-0.045% of Al; ni < 0.10%; cu < 0.10%; 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 as follows: preheating a section I: 800-1050 ℃; preheating a section II: 1000-1120 ℃; heating the I section: 1150-1230 ℃; heating in a second stage: 1220-1250 ℃; soaking section I: 1240-1260 ℃; soaking II: 1240-1270 ℃;
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;
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;
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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