Cold dial precision seamless steel pipe use method
Cold drawn steel pipes are one type of steel pipes, that is, one sorted according to different production processes, which is different from hot rolled (expanded) pipes. It is formed by multi-pass cold drawing in the process of expanding the diameter of the capillary tube or the raw material tube, and is usually carried out on a single-chain or double-chain cold drawing machine of 0.5 to 100T. Cold rolling (dial) steel pipe in addition to general steel pipe, low and medium pressure boiler steel pipe, high pressure boiler steel pipe, alloy steel pipe, stainless steel pipe, petroleum cracking pipe, mechanical processing pipe, thick wall pipe, small diameter plus inner mold cold drawn pipe other steel pipe It also includes carbon thin-walled steel pipes, alloy thin-walled steel pipes, stainless thin-walled steel pipes, and special-shaped steel pipes. Cold drawn steel pipe can have an outer diameter of 6mm and a wall thickness of 0.25mm. The outer diameter of the thin-walled pipe can be up to 5mm and the wall thickness is less than 0.25mm. The precision and surface quality are obviously better than the hot-rolled (expanded) pipe, but the process is affected. Restricted, its caliber and length are subject to certain restrictions.
Application of cold water pipe:
Cold-rolled (dial) seamless steel pipe in addition to general steel pipe, low and medium pressure boiler steel pipe, high pressure boiler steel pipe, alloy steel pipe, stainless steel pipe, petroleum cracking pipe, other steel pipes, also includes carbon thin-walled steel pipe, alloy thin-walled steel pipe, Stainless thin-walled steel pipe and special-shaped steel pipe.
The outer diameter of hot-rolled seamless pipe is generally larger than 32mm, the wall thickness is 2.5-75mm, the diameter of cold-rolled seamless steel pipe can reach 6mm, the wall thickness can reach 0.25mm, the outer diameter of thin-walled pipe can reach 5mm, the wall thickness is less than 0.25mm, cold Rolling is more accurate than hot rolling.
Cold rolling
It refers to the processing of steel plates or steel strips into various types of steel at room temperature by cold drawing, cold bending, cold drawing and other cold working.
Advantages: fast forming speed, high output, without damaging the coating, can be made into a variety of cross-section forms to meet the needs of the use conditions; cold rolling can make the steel produce a large plastic deformation, thereby improving the yield of the steel point.
Disadvantages: 1. Although there is no hot plastic compression in the forming process, there are still residual stresses in the section, which will inevitably affect the overall and local buckling characteristics of the steel; 2. The cold-rolled steel is generally open-section, making the section free. The torsional stiffness is low. It is easy to twist when bent, and it is prone to bending and torsion buckling when pressed, and the torsion resistance is poor. 3. The wall thickness of cold-rolled steel is small, and there is no thickening at the corners where the plates are joined. The ability to concentrate loads is weak.
Cold rolled precision seamless pipe details:
Cold drawn or cold rolled precision seamless pipe (GB3639-2000) is a cold drawn or cold rolled precision seamless steel pipe with high dimensional accuracy and good surface finish for mechanical structures and hydraulic equipment.
High-precision cold drawn precision steel pipe is a new type of high-tech energy-saving product. The promotion and application of high-precision cold-drawn precision steel pipe saves steel and improves processing efficiency, saving energy. The so-called high-precision cold-drawn pipe means that the inner and outer diameter dimensional accuracy (tolerance range) is strict, and the inner and outer surface finish, roundness and straightness are good. The main technical indexes of high-precision cold-drawn tubes produced by this technology with uniform wall thickness have reached or partially exceeded the requirements of national standard GB8713--88 and international standard ISO4394/I-1980(E). See the following table for details: Main technical indicators and standard comparison table items actually reach GB8713-88 ISO4394/I Inner diameter dimensional tolerance H8 H9 H10 H8 H9 H10 H8 H9 H10 Straightness 0.3/1000 A: 0.3/1000 A: 0.5/1000 B: 1/1000 B: 1/1000 C: 1.5/1000 C: 1.5/1000 Wall thickness % 10 ± wall thickness % 10 ± wall thickness % 5 ± wall thickness deviation roundness 0.04 Not specified.
Steel pipe weight calculation formula: [(outer diameter - wall thickness) * wall thickness] * 0.02466 = kg / m (weight per meter)
Classification of seamless steel pipes:
According to the production method, seamless steel tubes can be divided into hot rolled tubes, cold rolled tubes, cold drawn tubes, extruded tubes, and the like.
2. What types of seamless steel pipes are classified according to their shape?
The seamless steel tubes are classified into circular tubes and shaped tubes according to their shape. In addition to the square tube and the rectangular tube, the special-shaped tube has an elliptical tube, a semi-circular tube, a triangular tube, a hexagonal tube, a convex-shaped tube, a plum-shaped tube, and the like.
3. What types of seamless steel pipes are classified according to materials?
According to different materials, it is divided into ordinary carbon structural tube, low alloy structural tube, high quality carbon structural tube, alloy structural tube, stainless steel tube and so on.
4. What types of seamless steel pipes are classified according to their purposes?
According to special purposes, there are boiler tubes, geological tubes, oil pipes, etc.
5. What is the meaning of PQF and other English descriptions of steel pipes?
MPM - Limiting mandrel mill
MINI-MPM - less rack limit mandrel mill
PQF——Restricted mandrel three-roll continuous rolling mill
CPE - seamless steel pipe jacking machine
6. What is the continuous rolling mill used in our factory?
Our factory uses PQF - three-roll continuous rolling mill for limiting mandrel.
7. What is an oil well pipe?
Oil well pipe refers to the pipe used for oil and natural gas drilling, including drill pipe, casing and oil pipe.
8. What is the delivery tube?
The national standard used for the conveying pipe is: GB/T8163-1999, which is used to transport liquid and some solids. Including oil, natural gas, water gas pipelines, as well as coal, ore, grain conveying pipe, etc., the representative material is 20 steel, Q345 alloy steel.
9. What is a structural tube?
The national standard for the structural pipe is: GB/T8162-1999, and the structural pipe is used to make various machine parts and structure frames. Including bicycle tubes, pipe piles, various structural parts and bearing tubes, etc., the representative materials are carbon steel, 20, 45 steel; alloy steel Q345, 20Cr, 40Cr, 20CrMo, 30 ~ 35CrMo, 42CrMo and so on.
10. What is the heat exchange tube?
It refers to seamless steel tubes (GB3087-1999) for low and medium pressure boilers, representing materials No. 10 and No. 20 steel; seamless steel tubes for high pressure boilers (GB5310-1995), representing materials of 20G, 12Cr1MoVG, 15CrMoG, etc. Such pipes are heat exchanged through the pipe wall, including boiler tubes, heat exchanger tubes, and the like.
11. How are the specifications of seamless steel pipes marked?
The specifications of the steel pipe are expressed by the nominal size of the outer diameter, wall thickness and length. For example, (1) hot-rolled steel pipe, the outer diameter and the wall thickness are of ordinary grade accuracy, and the outer diameter of the steel made of No. 10 steel is 76 mm, the wall thickness is 3.5 mm, and the length is 3000mm times the scale is expressed as: 10-76×3.5×3000 times-GB3087-1999; (2) Cold-rolled (drawn) steel pipe, the outer diameter is high precision, the wall thickness is ordinary precision, and the outer diameter is 76 made of 10 steel. Mm, wall thickness 3.5 mm, length 5000 mm, marked as: cold 10-76 high x 3.5 x 5000-GB 3087-1999.
12. How is the steel tube unit named?
The form of the unit for producing steel pipes is varied. The specific name of the hot rolling mill is indicated by the type of the unit and the type of mill. For example, our factory 460PQF limited mandrel rolling mill unit, of which 460 means that the largest specification outer diameter of the steel tube can be produced by the unit is 460mm, and the rolling mill is in the form of a limiting mandrel mill.
Cold drawn steel pipes are one type of steel pipes, that is, one sorted according to different production processes, which is different from hot rolled (expanded) pipes. It is formed by multi-pass cold drawing in the process of expanding the diameter of the capillary tube or the raw material tube, and is usually carried out on a single-chain or double-chain cold drawing machine of 0.5 to 100T. Cold rolling (dial) steel pipe in addition to general steel pipe, low and medium pressure boiler steel pipe, high pressure boiler steel pipe, alloy steel pipe, stainless steel pipe, petroleum cracking pipe, mechanical processing pipe, thick wall pipe, small diameter plus inner mold cold drawn pipe other steel pipe It also includes carbon thin-walled steel pipes, alloy thin-walled steel pipes, stainless thin-walled steel pipes, and special-shaped steel pipes. Cold drawn steel pipe can have an outer diameter of 6mm and a wall thickness of 0.25mm. The outer diameter of the thin-walled pipe can be up to 5mm and the wall thickness is less than 0.25mm. The precision and surface quality are obviously better than the hot-rolled (expanded) pipe, but the process is affected. Restricted, its caliber and length are subject to certain restrictions.
Application of cold water pipe:
Cold-rolled (dial) seamless steel pipe in addition to general steel pipe, low and medium pressure boiler steel pipe, high pressure boiler steel pipe, alloy steel pipe, stainless steel pipe, petroleum cracking pipe, other steel pipes, also includes carbon thin-walled steel pipe, alloy thin-walled steel pipe, Stainless thin-walled steel pipe and special-shaped steel pipe.
The outer diameter of hot-rolled seamless pipe is generally larger than 32mm, the wall thickness is 2.5-75mm, the diameter of cold-rolled seamless steel pipe can reach 6mm, the wall thickness can reach 0.25mm, the outer diameter of thin-walled pipe can reach 5mm, the wall thickness is less than 0.25mm, cold Rolling is more accurate than hot rolling.
Cold rolling
It refers to the processing of steel plates or steel strips into various types of steel at room temperature by cold drawing, cold bending, cold drawing and other cold working.
Advantages: fast forming speed, high output, without damaging the coating, can be made into a variety of cross-section forms to meet the needs of the use conditions; cold rolling can make the steel produce a large plastic deformation, thereby improving the yield of the steel point.
Disadvantages: 1. Although there is no hot plastic compression in the forming process, there are still residual stresses in the section, which will inevitably affect the overall and local buckling characteristics of the steel; 2. The cold-rolled steel is generally open-section, making the section free. The torsional stiffness is low. It is easy to twist when bent, and it is prone to bending and torsion buckling when pressed, and the torsion resistance is poor. 3. The wall thickness of cold-rolled steel is small, and there is no thickening at the corners where the plates are joined. The ability to concentrate loads is weak.
Cold rolled precision seamless pipe details:
Cold drawn or cold rolled precision seamless pipe (GB3639-2000) is a cold drawn or cold rolled precision seamless steel pipe with high dimensional accuracy and good surface finish for mechanical structures and hydraulic equipment.
High-precision cold drawn precision steel pipe is a new type of high-tech energy-saving product. The promotion and application of high-precision cold-drawn precision steel pipe saves steel and improves processing efficiency, saving energy. The so-called high-precision cold-drawn pipe means that the inner and outer diameter dimensional accuracy (tolerance range) is strict, and the inner and outer surface finish, roundness and straightness are good. The main technical indexes of high-precision cold-drawn tubes produced by this technology with uniform wall thickness have reached or partially exceeded the requirements of national standard GB8713--88 and international standard ISO4394/I-1980(E). See the following table for details: Main technical indicators and standard comparison table items actually reach GB8713-88 ISO4394/I Inner diameter dimensional tolerance H8 H9 H10 H8 H9 H10 H8 H9 H10 Straightness 0.3/1000 A: 0.3/1000 A: 0.5/1000 B: 1/1000 B: 1/1000 C: 1.5/1000 C: 1.5/1000 Wall thickness % 10 ± wall thickness % 10 ± wall thickness % 5 ± wall thickness deviation roundness 0.04 Not specified.
Steel pipe weight calculation formula: [(outer diameter - wall thickness) * wall thickness] * 0.02466 = kg / m (weight per meter)
Classification of seamless steel pipes:
According to the production method, seamless steel tubes can be divided into hot rolled tubes, cold rolled tubes, cold drawn tubes, extruded tubes, and the like.
2. What types of seamless steel pipes are classified according to their shape?
The seamless steel tubes are classified into circular tubes and shaped tubes according to their shape. In addition to the square tube and the rectangular tube, the special-shaped tube has an elliptical tube, a semi-circular tube, a triangular tube, a hexagonal tube, a convex-shaped tube, a plum-shaped tube, and the like.
3. What types of seamless steel pipes are classified according to materials?
According to different materials, it is divided into ordinary carbon structural tube, low alloy structural tube, high quality carbon structural tube, alloy structural tube, stainless steel tube and so on.
4. What types of seamless steel pipes are classified according to their purposes?
According to special purposes, there are boiler tubes, geological tubes, oil pipes, etc.
5. What is the meaning of PQF and other English descriptions of steel pipes?
MPM - Limiting mandrel mill
MINI-MPM - less rack limit mandrel mill
PQF——Restricted mandrel three-roll continuous rolling mill
CPE - seamless steel pipe jacking machine
6. What is the continuous rolling mill used in our factory?
Our factory uses PQF - three-roll continuous rolling mill for limiting mandrel.
7. What is an oil well pipe?
Oil well pipe refers to the pipe used for oil and natural gas drilling, including drill pipe, casing and oil pipe.
8. What is the delivery tube?
The national standard used for the conveying pipe is: GB/T8163-1999, which is used to transport liquid and some solids. Including oil, natural gas, water gas pipelines, as well as coal, ore, grain conveying pipe, etc., the representative material is 20 steel, Q345 alloy steel.
9. What is a structural tube?
The national standard for the structural pipe is: GB/T8162-1999, and the structural pipe is used to make various machine parts and structure frames. Including bicycle tubes, pipe piles, various structural parts and bearing tubes, etc., the representative materials are carbon steel, 20, 45 steel; alloy steel Q345, 20Cr, 40Cr, 20CrMo, 30 ~ 35CrMo, 42CrMo and so on.
10. What is the heat exchange tube?
It refers to seamless steel tubes (GB3087-1999) for low and medium pressure boilers, representing materials No. 10 and No. 20 steel; seamless steel tubes for high pressure boilers (GB5310-1995), representing materials of 20G, 12Cr1MoVG, 15CrMoG, etc. Such pipes are heat exchanged through the pipe wall, including boiler tubes, heat exchanger tubes, and the like.
11. How are the specifications of seamless steel pipes marked?
The specifications of the steel pipe are expressed by the nominal size of the outer diameter, wall thickness and length. For example, (1) hot-rolled steel pipe, the outer diameter and the wall thickness are of ordinary grade accuracy, and the outer diameter of the steel made of No. 10 steel is 76 mm, the wall thickness is 3.5 mm, and the length is 3000mm times the scale is expressed as: 10-76×3.5×3000 times-GB3087-1999; (2) Cold-rolled (drawn) steel pipe, the outer diameter is high precision, the wall thickness is ordinary precision, and the outer diameter is 76 made of 10 steel. Mm, wall thickness 3.5 mm, length 5000 mm, marked as: cold 10-76 high x 3.5 x 5000-GB 3087-1999.
12. How is the steel tube unit named?
The form of the unit for producing steel pipes is varied. The specific name of the hot rolling mill is indicated by the type of the unit and the type of mill. For example, our factory 460PQF limited mandrel rolling mill unit, of which 460 means that the largest specification outer diameter of the steel tube can be produced by the unit is 460mm, and the rolling mill is in the form of a limiting mandrel mill.
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