CN111872592B - Steel pipe longitudinal strength quality control method based on pipeline girth weld strength matching - Google Patents
Steel pipe longitudinal strength quality control method based on pipeline girth weld strength matching Download PDFInfo
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- CN111872592B CN111872592B CN202010549721.3A CN202010549721A CN111872592B CN 111872592 B CN111872592 B CN 111872592B CN 202010549721 A CN202010549721 A CN 202010549721A CN 111872592 B CN111872592 B CN 111872592B
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- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
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- B23K31/12—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to investigating the properties, e.g. the weldability, of materials
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Abstract
The invention discloses a steel pipe longitudinal strength quality control method based on pipeline circumferential weld strength matching, which comprises the steps of determining the strength grade of a steel pipe, collecting actual weld metal strength data of equal-strength welding materials, calculating the average value and standard deviation of weld metal strength normal distribution, calculating the minimum strength of weld metal, determining the average value of steel pipe longitudinal strength, determining steel pipe longitudinal minimum strength, calculating the standard deviation of steel pipe longitudinal strength normal distribution, calculating steel pipe longitudinal maximum strength, determining the control range of steel pipe longitudinal strength, and making and revising steel plate technical conditions and quality control schemes. By adopting the method, the control of the longitudinal strength of the steel pipe is realized from the source, so that the matching of the circumferential weld strength of the pipeline is ensured to be equal, the condition that the actual circumferential weld strength is lower than the longitudinal strength of the steel pipe due to the fact that the welding process and welding materials are selected by adopting the minimum circumferential tensile strength of the steel pipe specified by the original standard is avoided, the occurrence of the circumferential weld fracture accident of the pipeline is greatly reduced, and the safe operation of the pipeline is ensured.
Description
Technical Field
The invention belongs to the technical field of pipeline girth welding and steel pipe manufacturing, and relates to a steel pipe longitudinal strength quality control method based on pipeline girth welding strength matching.
Background
With the increasing demand for energy, large-scale construction of oil and gas transmission pipelines is beginning worldwide. However, long-distance oil and gas transmission pipelines often pass through complex regions such as deserts, plains, water areas, mountainous regions and the like and towns with dense population, the safe and reliable operation of the pipelines has important significance for the social and natural environments, and once the pipelines fail, catastrophic accidents are caused. Statistics shows that most of domestic and foreign long-distance pipeline failure accidents are represented by circumferential weld fracture, and the strength matching of the circumferential weld plays a crucial role in pipeline fracture failure.
At present, pipeline girth weld joints at home and abroad generally adopt an equal strength design or a high strength matching principle, and the selected welding materials for the evaluation of the welding process are determined according to the minimum circumferential strength (transverse strength) of a steel pipe body specified by a standard. However, the pipe connects two adjacent steel pipes through a girth weld, and therefore the circumferential strength of the pipe body of the steel pipe is not directly linked to the strength matching of the girth weld joint. Meanwhile, the steel pipes adopted by the long oil and gas transmission pipeline are made of steel plates of different steel mills from different steel mills, and the actual strength of the steel pipes is dispersed. In addition, most of the national pipeline designs still adopt more stress designs, design documents and manufacturing standards or technical conditions only specify the circumferential strength of the steel pipe, no specific control requirements are required on the longitudinal strength of the steel pipe, and no method for controlling the longitudinal strength of the steel pipe based on the pipeline girth weld strength matching requirements is provided. If the circumferential strength of the steel pipe body is still specified by standards to select welding materials and processes, the problem of strength matching of a circumferential weld joint cannot be solved fundamentally, and the rupture and failure of the circumferential weld joint of the pipeline are possibly caused, so that catastrophic accidents occur.
Disclosure of Invention
The invention aims to provide a quality control method for longitudinal strength of a steel pipe based on strength matching of a pipeline circumferential weld aiming at the limitation of determining the strength matching of the pipeline circumferential weld by adopting the circumferential strength of the steel pipe.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
the quality control method of the longitudinal strength of the steel pipe based on the strength matching of the pipeline girth weld comprises the following steps:
s1, determining the strength level Rt of the steel pipe;
s2, collecting actual weld metal strength data of the equal-strength welding material;
s3, performing normal distribution statistics on the collected actual weld metal strength data of the equal-strength welding materials, and calculating the mean value mu and the standard deviation sigma of the weld metal strength by using the collected actual weld metal strength data of the equal-strength welding materials;
s4, calculating the minimum strength Rw of the weld metal by using the mean value and the standard deviation of the weld metal strength according to the 3 sigma criterion of normal distribution;
s5, determining the mean value omega of the longitudinal strength of the steel pipe according to the minimum strength Rw of the weld metal;
s6, determining the longitudinal minimum strength Ro of the steel pipe according to the strength grade Rt of the steel pipe and the acceptance standard or design file of the pipeline girth weld;
s7, calculating a standard deviation lambda of normal distribution of the longitudinal strength of the steel pipe according to the mean omega of the longitudinal strength of the steel pipe and the longitudinal minimum strength Ro of the steel pipe;
s8, calculating the longitudinal maximum strength Rp of the steel pipe according to the mean value omega of the longitudinal strength of the steel pipe and the standard deviation lambda of the normal distribution of the longitudinal strength of the steel pipe;
s9, determining the control range of the longitudinal strength of the steel pipe to be Ro-Rp;
and S10, revising the technical conditions and the quality control scheme of the steel plate according to the control range of the longitudinal strength of the steel pipe ranging from Ro to Rp.
Preferably, in S1, the strength grade of the steel pipe used is determined according to the pipe design file.
Preferably, in S2, the grade of the selected welding material is determined according to the design principle of strength of the welding joint and the like, and data of the actual weld metal strength is collected.
Preferably, in S3, the collected grade weld metal strength data is subjected to normal distribution statistical processing, and the mean and standard deviation of the weld metal strength are calculated.
Preferably, in S5, the average longitudinal strength of the steel pipe is equal to the minimum strength of the weld metal strength.
Preferably, in S6, the steel pipe longitudinal minimum strength Ro = (0.95-1.05) Rt, wherein Rt is the strength grade of the steel pipe.
Preferably, in S7, the normal distribution standard deviation λ = (ω -Ro)/3 of the longitudinal strength is calculated according to the normal distribution small probability event principle, where ω is the mean value of the longitudinal strength of the steel pipe.
Preferably, in S8, the maximum longitudinal strength Rp = ω +3 λ of the steel pipe is calculated according to the principle of normal distribution small probability event, where ω is the mean value of the longitudinal strength of the steel pipe, and λ is the normal distribution standard deviation of the longitudinal strength of the steel pipe.
Preferably, the strength level of the steel pipe is characterized by a minimum yield strength or a minimum tensile strength in the transverse direction of the steel pipe body (i.e., in the circumferential direction of the steel pipe body).
Compared with the prior art, the invention has the following beneficial effects:
the invention relates to a steel pipe longitudinal strength quality control method based on pipeline girth weld strength matching, which determines the steel pipe longitudinal strength range adopted by a pipeline by utilizing a normally distributed '3 sigma principle' and a girth weld acceptance standard or a design file, and realizes the control of the steel pipe longitudinal strength from the source by revising the technical conditions and the quality control scheme of a steel plate, thereby ensuring that the pipeline girth weld strength matching meets the equal-strength or high-strength matching requirement, avoiding that the actual girth weld strength caused by selecting a welding process and a welding material by adopting the steel pipe circumferential minimum tensile strength specified by the original standard is lower than the steel pipe longitudinal strength, greatly reducing the occurrence of pipeline girth weld fracture accidents, and ensuring the safe operation of the pipeline.
Drawings
FIG. 1 is a flow chart of a method for controlling the longitudinal strength quality of a steel pipe based on the strength matching of a pipeline circumferential weld according to the present invention.
FIG. 2 is an exemplary diagram of a method for controlling the longitudinal strength of an X80 steel pipe based on the strength matching of a pipeline girth weld in the embodiment of the invention.
Detailed Description
The invention is described in further detail below with reference to the following figures and examples:
referring to fig. 1, the method for controlling the longitudinal strength quality of the steel pipe based on the strength matching of the circumferential weld of the pipeline comprises the following steps:
firstly, determining the strength grade of a steel pipe: determining the strength level Rt of the adopted steel pipe according to the pipeline design file;
and secondly, collecting actual weld metal strength data of the equal-strength welding material: determining the grade of the selected welding material and collecting data of the actual welding seam metal strength according to the principle of equal strength design of a welding joint;
thirdly, normal distribution statistics is carried out, and the mean value mu and the standard deviation sigma of the weld metal strength are calculated: carrying out normal distribution statistical processing on the collected grade welding seam metal strength data, and calculating the mean value mu and the standard deviation sigma of the welding seam metal strength;
fourthly, calculating the minimum strength Rw of the weld metal: according to the '3 sigma' principle of normal distribution, calculating the minimum strength of the weld metal as Rw = mu-3 sigma;
and fifthly, determining the average value omega of the longitudinal strength of the steel pipe: in order to ensure that the strength matching of the pipeline girth weld is equal strength or high strength matching, the longitudinal strength mean value of the steel pipe is consistent with the minimum strength of the weld metal strength, namely omega = Rw;
sixthly, determining the longitudinal minimum strength Ro of the steel pipe: determining the longitudinal minimum strength Ro of the steel pipe according to the acceptance standard or design file of the pipeline girth weld, wherein the Ro is generally not (0.95-1.05) Rt;
and seventhly, calculating the standard deviation lambda of the normal distribution of the longitudinal strength of the steel pipe: the longitudinal strength of the steel pipe is normally distributed, and the standard deviation lambda = (omega-Ro)/3 of the normal distribution of the longitudinal strength is calculated according to the principle of normal distribution 'small probability event';
and eighthly, calculating the longitudinal maximum strength Rp of the steel pipe: similarly, according to the principle of normal distribution 'small probability event', calculating the longitudinal maximum strength Rp = omega +3 lambda of the steel pipe;
ninth, determining the control range of the longitudinal strength of the steel pipe to be Ro-Rp;
tenth step, revising the technical conditions and quality control scheme of the steel plate: and revising the technical conditions and the quality control scheme of the steel plate according to the control range Ro-Rp of the longitudinal strength of the steel pipe determined in the ninth step.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. 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.
Examples
Referring to fig. 2, an example of a method for controlling the longitudinal strength of an X80 steel pipe based on strength matching of a pipe girth weld is given.
The X80 steel tube longitudinal strength control method based on pipeline girth weld strength matching comprises the following steps:
firstly, determining the strength grade of a steel pipe: determining the adopted strength to be X80 steel grade steel pipe according to the pipeline design file, and the minimum tensile strength Rt =625 MPa;
and secondly, collecting actual weld metal strength data of the equal-strength welding material: according to the principle of 'equal-strength design' of a welding joint, determining the selected welding wire to be ER80S-G, and collecting data of actual weld metal strength of ER 80S-G;
thirdly, normal distribution statistics is carried out, and the mean value mu and the standard deviation sigma of the weld metal strength are calculated: carrying out normal distribution statistical treatment on the collected grade welding seam metal strength data, and calculating the mean value mu =700MPa and the standard deviation sigma =20MPa of the welding seam metal strength;
fourthly, calculating the minimum strength Rw of the weld metal: according to the '3 sigma' principle of normal distribution, calculating the minimum strength of the weld metal to be Rw = mu-3 sigma =640 MPa;
and fifthly, determining the average value omega of the longitudinal strength of the steel pipe: in order to ensure that the strength matching of the pipeline girth weld is equal strength or high strength matching, the longitudinal strength mean value of the steel pipe is consistent with the minimum strength of the weld metal strength, namely omega = Rw =640 MPa;
sixthly, determining the longitudinal minimum strength Ro of the steel pipe: determining the minimum strength Ro in the longitudinal direction of the steel pipe according to the acceptance standard or the design file of the pipeline girth weld, wherein the Ro is generally =0.95Rt =594 MPa;
and seventhly, calculating the standard deviation lambda of the normal distribution of the longitudinal strength of the steel pipe: the longitudinal strength of the steel pipe is normally distributed, and the standard deviation lambda = (omega-Ro)/3 =46/3MPa of the normal distribution of the longitudinal strength is calculated according to the principle of normal distribution 'small probability event';
and eighthly, calculating the longitudinal maximum strength Rp of the steel pipe: similarly, according to the principle of normal distribution 'small probability event', calculating the longitudinal maximum strength Rp = omega +3 lambda =686MPa of the steel pipe;
ninthly, determining that the control range of the longitudinal strength of the steel pipe is 594-686 MPa;
tenth step, revising the technical conditions and quality control scheme of the steel plate: and revising the technical conditions and the quality control scheme of the steel plate according to the control range of the longitudinal strength of the steel pipe determined in the ninth step, which is 594-686 MPa.
It can be seen from the above that the control method for determining the longitudinal strength of the steel pipe is determined according to the principle of normal distribution of the actual weld metal strength of the welding materials matched with the strength grade of the steel pipe and the 3 sigma principle according to the equal-strength design principle of the circumferential weld joint. The method comprises the steps of determining the strength grade of the steel pipe, collecting actual weld metal strength data of the equal-strength welding materials, calculating the average value mu and the standard deviation sigma of normal distribution of the weld metal strength, calculating the minimum strength Rw of the weld metal, determining the average value omega of longitudinal strength of the steel pipe, determining the longitudinal minimum strength Ro of the steel pipe, calculating the standard deviation lambda of normal distribution of the longitudinal strength of the steel pipe, calculating the longitudinal maximum strength Rp of the steel pipe, determining the control range of the longitudinal strength of the steel pipe to be Ro-Rp, and revising the technical conditions and the quality control scheme of the steel plate. By adopting the method, the control of the longitudinal strength of the steel pipe is realized from the source, so that the matching of the circumferential weld strength of the pipeline is ensured to be equal, the condition that the actual circumferential weld strength is lower than the longitudinal strength of the steel pipe due to the fact that the welding process and welding materials are selected by adopting the minimum circumferential tensile strength of the steel pipe specified by the original standard is avoided, the occurrence of the circumferential weld fracture accident of the pipeline is greatly reduced, and the safe operation of the pipeline is ensured.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (6)
1. The quality control method for the longitudinal strength of the steel pipe based on the strength matching of the pipeline girth weld is characterized by comprising the following steps of:
s1, determining the strength level of the steel pipe;
s2, collecting actual weld metal strength data of the equal-strength welding material;
s3, carrying out normal distribution statistics on the collected actual weld metal strength data of the equal-strength welding material, and calculating the mean value and standard deviation of the weld metal strength by using the collected actual weld metal strength data of the equal-strength welding material;
s4, calculating the minimum strength of the weld metal by using the mean value and the standard deviation of the weld metal strength according to the 3 sigma criterion of normal distribution;
s5, determining the average value of the longitudinal strength of the steel pipe according to the minimum strength of the weld metal;
s6, determining the longitudinal minimum strength Ro of the steel pipe according to the strength grade of the steel pipe and the acceptance standard or design file of the pipeline girth weld;
s7, calculating the standard deviation of normal distribution of the longitudinal strength of the steel pipe according to the mean value of the longitudinal strength of the steel pipe and the longitudinal minimum strength Ro of the steel pipe;
s8, calculating the longitudinal maximum strength Rp of the steel pipe according to the average value of the longitudinal strength of the steel pipe and the standard deviation of the normal distribution of the longitudinal strength of the steel pipe;
s9, determining the control range of the longitudinal strength of the steel pipe to be Ro-Rp;
s10, revising the technical conditions and quality control scheme of the steel plate according to the control range of the longitudinal strength of the steel pipe ranging from Ro to Rp;
in S5, the average longitudinal strength of the steel pipe is equal to the minimum strength of the weld metal strength;
in S6, the steel pipe longitudinal minimum strength Ro = (0.95-1.05) Rt, wherein Rt is the strength grade of the steel pipe.
2. The method for controlling the longitudinal strength of the steel pipe based on the strength matching of the pipe girth weld according to claim 1, wherein in the step S1, the strength grade of the adopted steel pipe is determined according to a pipe design file.
3. The method for controlling the longitudinal strength and the quality of the steel pipe based on the strength matching of the circumferential weld of the pipeline as claimed in claim 1, wherein in S2, the selected welding material grade is determined and the data of the actual weld metal strength is collected according to the strong design principle of a welding joint and the like.
4. The method for controlling the longitudinal strength of the steel pipe based on the strength matching of the pipe circumferential weld according to claim 1, wherein in S7, the normal distribution standard deviation λ = (ω -Ro)/3 of the longitudinal strength is calculated according to the normal distribution small probability event principle, wherein ω is the mean value of the longitudinal strength of the steel pipe.
5. The quality control method for the longitudinal strength of the steel pipe based on the strength matching of the pipe circumferential weld according to claim 1, wherein in S8, the maximum longitudinal strength Rp = ω +3 λ of the steel pipe is calculated according to the principle of normal distribution small probability event, wherein ω is the mean value of the longitudinal strength of the steel pipe, and λ is the normal distribution standard deviation of the longitudinal strength of the steel pipe.
6. The method for controlling the longitudinal strength of the steel pipe based on the strength matching of the pipe circumferential weld according to claim 1, wherein the strength grade of the steel pipe is characterized by the minimum yield strength or the minimum tensile strength of the steel pipe body in the transverse direction.
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| JP5197496B2 (en) * | 2009-06-03 | 2013-05-15 | 株式会社神戸製鋼所 | Quality control method for brittle crack propagation stopping performance of T-shaped full penetration welded structure |
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