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Inductive Bending TechnologyMachines and methods for the bending of steel pipes and sections using inductive heating
UNIWELD MaschinenbauGmbH & Co. KG
Werkstraße 2057299 Burbach
Tel.: +49 (0) 2736 415 - 0Fax: +49 (0) 2736 415 - 199
Reduction of the number of weld seams
With pipe lengths of up to 18 metres, the number of circumferential welds can be reduced. Straight legs and/or multiple bends on one pipe can be produced with 3D and multi-level bends.
Advantagesof inductively bent steel pipes
A comparison of isometry of a conventionally designed power
plant pipeline shows that 10 + 14 circ welds are required (upper pic-ture). Only 4 + 5 circ welds remain
to be produced when custom-made, inductively bent steel pipes
are used (lower picture).
All non-alloyed, alloyed, and high-alloyed steel pipes can be bent with our machines. With this bending method, even line pipes made of thermo-mechanically rolled steel can be produced, a steel which sets high standards with regard to modified material grades, bending technique, and heat treatment.
The following steel grades and steel grade groups are suitable for inductive bending:
Application-specific materials
Steels for long-distance pipelines, including TM steel grades Temperature-resistant and high-temperature resistant steels Corrosion-resistant and acid-proof steels Normal carbon steels Fine-grain structural steel Low-temperature steels
Case-hardening steels and Q&T steels Heat-resistant steels Clad pipes Duplex Super Duplex
Inductive pipe bending machinesSTENSKE-INDUSTRIES and UNIWELD MASCHINENBAU propose a new machine design
Bending radius and bending angle
Machine models UM/STRBMI
The companies, having 35 years of experience in building inductive pipe bending machines, used this knowledge for a new development of inductive bending machines. The new model offers an efficient production method by implementing an automatic bending mode.
These machines have been designed to bend ferritic and austenitic steel pipes. High productivity is achieved for all kinds of bendings, encompassing three-dimensional elbow structures (3D) as well as S-shaped structures (left/right bends) in one plane. These bending structures are characterized by achieving tight tolerances and a high re-peating accuracy through an automated bending process.
The inductive pipe bending machines come in various sizes and are suitable to bend pipes with diameters starting from 50 mm to 1,600 mm for all kinds of application.
The inductive pipe bending machines Type UM/STRBMI can be supplied in various designs and capacities for nearly all kinds of application. We offer the suitable machine design for each specific application.
Type UM/STRBMI 300 600 800 1000 1300 1600
max. diameter: 406 mm 610 mm 813 mm 1066 mm 1220 mm 1626 mm
16 inch 24 inch 32 inch 42 inch 48 inch 64 inch
wall Thickness S: 3 - 40 mm 3 - 80 mm 5 – 100 mm 6,3 – 120 mm 6,3 – 120 mm 6,3 – 120 mm
max. bending radius: 2100 mm 3100 mm 4100 mm 5500 mm 6100 mm 11500 mm
feasible bending radii R 1,4 – 10 x D
max. wall thickness reduction 1,4 x D 12%
ovality at 1,4 x D 4% tighter ovality tolerances (less than 4 % for 1,5 x D elbows) is achieved by utilizing an extra feature
max. bending angle 183° (+/- 0,5°)
These machines are distinguished from conventionally built inductive pipe bending machines by the following features:
Control systems (control desk): Input screen „Operation“
Simple insertion of the straight pipe into the clamping unit of the pipe feeding cart (suitable for all pipe diameters).
No crane is needed to insert the pipe.
Reduction of the machine base length [e. g. maximum 6,500 mm clamping length needed for a pipe diameter 32“ (812,8 mm) and 5D elbow for a bending angle of 183°].
The machine is able to process up to 18.0 m of pipe length.
It is no longer necessary to change the pipe clamping tool. It is possible to produce left-hand and right-hand bends to „S“ bends of 183° in one plane, and three- dimensional bends, too.
Simple handling of the bent pipes and multiple complicated 3D bends. A safe removal of the pipe from the machine is ensured.
Tighter ovality tolerances (< 4 % in case of 1.5 D bends) can be achieved by installing an additional feature.
During the bending process of thick-walled pipes (e. g. 120 mm), the temperature is controlled not only on the outside surface but also on the inner pipe wall. With this material-adapted warm-forming method, tight tolerances at high output rates can be guaranteed.
The machine, with its automatic operation and hand- ling during loading and unloading of the pipes, is particularly suitable for a cost-effective production of induction pipe bends.
The efficiency can be increased by up to 30 % for certain kinds of bends compared to conventional machines.
The two diagrams on the right show the bending range for seamless and welded steel pipes. The diagrams show a specific outer diameter and fixed bending radius. You can read out the ne-cessary minimum wall thickness. Vice versa, you can read out the necessary minimum bending radius if the outer diameter and the minimum wall thickness are specified.The bending radius can be infinitely adjusted between 20 mm and 10,000 mm (depending on machine size). Larger radii upon request.Bending angles up to 183° can be produced, depending on pipe dimension, material grade, and bending radius.Our machines of Type UM/STRBMI which belong to the most powerful machines of the world are designed to perform the inductive bending of steel pipes.
The powerful layout of our machines and the ef-ficiency of the complete inductive bending ma-chinery create additional room to move to solve special problems, as for example when it comes to bending of forgings and forged sections.
A) pipes made of ferritic steels
B) pipes made of austenitic steels
Inductive pipe bending machinesSTENSKE-INDUSTRIES and UNIWELD MASCHINENBAU propose a new machine design
Bending radius and bending angle
Machine models UM/STRBMI
The companies, having 35 years of experience in building inductive pipe bending machines, used this knowledge for a new development of inductive bending machines. The new model offers an efficient production method by implementing an automatic bending mode.
These machines have been designed to bend ferritic and austenitic steel pipes. High productivity is achieved for all kinds of bendings, encompassing three-dimensional elbow structures (3D) as well as S-shaped structures (left/right bends) in one plane. These bending structures are characterized by achieving tight tolerances and a high re-peating accuracy through an automated bending process.
The inductive pipe bending machines come in various sizes and are suitable to bend pipes with diameters starting from 50 mm to 1,600 mm for all kinds of application.
The inductive pipe bending machines Type UM/STRBMI can be supplied in various designs and capacities for nearly all kinds of application. We offer the suitable machine design for each specific application.
Type UM/STRBMI 300 600 800 1000 1300 1600
max. diameter: 406 mm 610 mm 813 mm 1066 mm 1220 mm 1626 mm
16 inch 24 inch 32 inch 42 inch 48 inch 64 inch
wall Thickness S: 3 - 40 mm 3 - 80 mm 5 – 100 mm 6,3 – 120 mm 6,3 – 120 mm 6,3 – 120 mm
max. bending radius: 2100 mm 3100 mm 4100 mm 5500 mm 6100 mm 11500 mm
feasible bending radii R 1,4 – 10 x D
max. wall thickness reduction 1,4 x D 12%
ovality at 1,4 x D 4% tighter ovality tolerances (less than 4 % for 1,5 x D elbows) is achieved by utilizing an extra feature
max. bending angle 183° (+/- 0,5°)
These machines are distinguished from conventionally built inductive pipe bending machines by the following features:
Control systems (control desk): Input screen „Operation“
Simple insertion of the straight pipe into the clamping unit of the pipe feeding cart (suitable for all pipe diameters).
No crane is needed to insert the pipe.
Reduction of the machine base length [e. g. maximum 6,500 mm clamping length needed for a pipe diameter 32“ (812,8 mm) and 5D elbow for a bending angle of 183°].
The machine is able to process up to 18.0 m of pipe length.
It is no longer necessary to change the pipe clamping tool. It is possible to produce left-hand and right-hand bends to „S“ bends of 183° in one plane, and three- dimensional bends, too.
Simple handling of the bent pipes and multiple complicated 3D bends. A safe removal of the pipe from the machine is ensured.
Tighter ovality tolerances (< 4 % in case of 1.5 D bends) can be achieved by installing an additional feature.
During the bending process of thick-walled pipes (e. g. 120 mm), the temperature is controlled not only on the outside surface but also on the inner pipe wall. With this material-adapted warm-forming method, tight tolerances at high output rates can be guaranteed.
The machine, with its automatic operation and hand- ling during loading and unloading of the pipes, is particularly suitable for a cost-effective production of induction pipe bends.
The efficiency can be increased by up to 30 % for certain kinds of bends compared to conventional machines.
The two diagrams on the right show the bending range for seamless and welded steel pipes. The diagrams show a specific outer diameter and fixed bending radius. You can read out the ne-cessary minimum wall thickness. Vice versa, you can read out the necessary minimum bending radius if the outer diameter and the minimum wall thickness are specified.The bending radius can be infinitely adjusted between 20 mm and 10,000 mm (depending on machine size). Larger radii upon request.Bending angles up to 183° can be produced, depending on pipe dimension, material grade, and bending radius.Our machines of Type UM/STRBMI which belong to the most powerful machines of the world are designed to perform the inductive bending of steel pipes.
The powerful layout of our machines and the ef-ficiency of the complete inductive bending ma-chinery create additional room to move to solve special problems, as for example when it comes to bending of forgings and forged sections.
A) pipes made of ferritic steels
B) pipes made of austenitic steels
Inductive pipe bending machinesSTENSKE-INDUSTRIES and UNIWELD MASCHINENBAU propose a new machine design
Bending radius and bending angle
Machine models UM/STRBMI
The companies, having 35 years of experience in building inductive pipe bending machines, used this knowledge for a new development of inductive bending machines. The new model offers an efficient production method by implementing an automatic bending mode.
These machines have been designed to bend ferritic and austenitic steel pipes. High productivity is achieved for all kinds of bendings, encompassing three-dimensional elbow structures (3D) as well as S-shaped structures (left/right bends) in one plane. These bending structures are characterized by achieving tight tolerances and a high re-peating accuracy through an automated bending process.
The inductive pipe bending machines come in various sizes and are suitable to bend pipes with diameters starting from 50 mm to 1,600 mm for all kinds of application.
The inductive pipe bending machines Type UM/STRBMI can be supplied in various designs and capacities for nearly all kinds of application. We offer the suitable machine design for each specific application.
Type UM/STRBMI 300 600 800 1000 1300 1600
max. diameter: 406 mm 610 mm 813 mm 1066 mm 1220 mm 1626 mm
16 inch 24 inch 32 inch 42 inch 48 inch 64 inch
wall Thickness S: 3 - 40 mm 3 - 80 mm 5 – 100 mm 6,3 – 120 mm 6,3 – 120 mm 6,3 – 120 mm
max. bending radius: 2100 mm 3100 mm 4100 mm 5500 mm 6100 mm 11500 mm
feasible bending radii R 1,4 – 10 x D
max. wall thickness reduction 1,4 x D 12%
ovality at 1,4 x D 4% tighter ovality tolerances (less than 4 % for 1,5 x D elbows) is achieved by utilizing an extra feature
max. bending angle 183° (+/- 0,5°)
These machines are distinguished from conventionally built inductive pipe bending machines by the following features:
Control systems (control desk): Input screen „Operation“
Simple insertion of the straight pipe into the clamping unit of the pipe feeding cart (suitable for all pipe diameters).
No crane is needed to insert the pipe.
Reduction of the machine base length [e. g. maximum 6,500 mm clamping length needed for a pipe diameter 32“ (812,8 mm) and 5D elbow for a bending angle of 183°].
The machine is able to process up to 18.0 m of pipe length.
It is no longer necessary to change the pipe clamping tool. It is possible to produce left-hand and right-hand bends to „S“ bends of 183° in one plane, and three- dimensional bends, too.
Simple handling of the bent pipes and multiple complicated 3D bends. A safe removal of the pipe from the machine is ensured.
Tighter ovality tolerances (< 4 % in case of 1.5 D bends) can be achieved by installing an additional feature.
During the bending process of thick-walled pipes (e. g. 120 mm), the temperature is controlled not only on the outside surface but also on the inner pipe wall. With this material-adapted warm-forming method, tight tolerances at high output rates can be guaranteed.
The machine, with its automatic operation and hand- ling during loading and unloading of the pipes, is particularly suitable for a cost-effective production of induction pipe bends.
The efficiency can be increased by up to 30 % for certain kinds of bends compared to conventional machines.
The two diagrams on the right show the bending range for seamless and welded steel pipes. The diagrams show a specific outer diameter and fixed bending radius. You can read out the ne-cessary minimum wall thickness. Vice versa, you can read out the necessary minimum bending radius if the outer diameter and the minimum wall thickness are specified.The bending radius can be infinitely adjusted between 20 mm and 10,000 mm (depending on machine size). Larger radii upon request.Bending angles up to 183° can be produced, depending on pipe dimension, material grade, and bending radius.Our machines of Type UM/STRBMI which belong to the most powerful machines of the world are designed to perform the inductive bending of steel pipes.
The powerful layout of our machines and the ef-ficiency of the complete inductive bending ma-chinery create additional room to move to solve special problems, as for example when it comes to bending of forgings and forged sections.
A) pipes made of ferritic steels
B) pipes made of austenitic steels
Inductive Bending TechnologyMachines and methods for the bending of steel pipes and sections using inductive heating
UNIWELD MaschinenbauGmbH & Co. KG
Werkstraße 2057299 Burbach
Tel.: +49 (0) 2736 415 - 0Fax: +49 (0) 2736 415 - 199
Reduction of the number of weld seams
With pipe lengths of up to 18 metres, the number of circumferential welds can be reduced. Straight legs and/or multiple bends on one pipe can be produced with 3D and multi-level bends.
Advantagesof inductively bent steel pipes
A comparison of isometry of a conventionally designed power
plant pipeline shows that 10 + 14 circ welds are required (upper pic-ture). Only 4 + 5 circ welds remain
to be produced when custom-made, inductively bent steel pipes
are used (lower picture).
All non-alloyed, alloyed, and high-alloyed steel pipes can be bent with our machines. With this bending method, even line pipes made of thermo-mechanically rolled steel can be produced, a steel which sets high standards with regard to modified material grades, bending technique, and heat treatment.
The following steel grades and steel grade groups are suitable for inductive bending:
Application-specific materials
Steels for long-distance pipelines, including TM steel grades Temperature-resistant and high-temperature resistant steels Corrosion-resistant and acid-proof steels Normal carbon steels Fine-grain structural steel Low-temperature steels
Case-hardening steels and Q&T steels Heat-resistant steels Clad pipes Duplex Super Duplex
Inductive Bending TechnologyMachines and methods for the bending of steel pipes and sections using inductive heating
UNIWELD MaschinenbauGmbH & Co. KG
Werkstraße 2057299 Burbach
Tel.: +49 (0) 2736 415 - 0Fax: +49 (0) 2736 415 - 199
Reduction of the number of weld seams
With pipe lengths of up to 18 metres, the number of circumferential welds can be reduced. Straight legs and/or multiple bends on one pipe can be produced with 3D and multi-level bends.
Advantagesof inductively bent steel pipes
A comparison of isometry of a conventionally designed power
plant pipeline shows that 10 + 14 circ welds are required (upper pic-ture). Only 4 + 5 circ welds remain
to be produced when custom-made, inductively bent steel pipes
are used (lower picture).
All non-alloyed, alloyed, and high-alloyed steel pipes can be bent with our machines. With this bending method, even line pipes made of thermo-mechanically rolled steel can be produced, a steel which sets high standards with regard to modified material grades, bending technique, and heat treatment.
The following steel grades and steel grade groups are suitable for inductive bending:
Application-specific materials
Steels for long-distance pipelines, including TM steel grades Temperature-resistant and high-temperature resistant steels Corrosion-resistant and acid-proof steels Normal carbon steels Fine-grain structural steel Low-temperature steels
Case-hardening steels and Q&T steels Heat-resistant steels Clad pipes Duplex Super Duplex
