How to calculate the drawing force of cold drawn precision steel

[(outer diameter wall thickness) * wall thickness] * 0.02466 = kg / M (weight per meter) according to different proction methods, it can be divided into hot rolled pipe, cold rolled pipe, cold drawn pipe, extruded pipe, etc. The biggest difference between cold drawn seamless steel pipe and hot-rolled seamless steel pipe is that the precision of cold drawn seamless steel pipe is better than that of hot-rolled seamless steel pipe. The general precision of cold drawn seamless steel pipe is about 20 wires, while the precision of hot-rolled seamless steel pipe is about 100 wires. Therefore, cold drawn seamless steel pipe is the first choice for mechanical processing manufacturing instry and parts manufacturing instry
1.1 hot rolled seamless tubes are generally proced in automatic tube rolling mill. After checking and removing the surface defects, the solid tube blank is cut to the required length, centring on the end face of the piercing end of the tube blank, then sent to the heating furnace for heating, and perforated on the piercing machine. Under the action of the roller and the plug, a cavity is graally formed inside the tube blank, which is called the blank tube. Then it is sent to the automatic pipe rolling mill to continue rolling. Finally, the wall thickness of the whole machine is adjusted, and the sizing (recing) machine is used for sizing (recing) to meet the specification requirements. It is an advanced method to proce hot rolled seamless steel tube by continuous rolling mill< In order to obtain the seamless tube with smaller size and better quality,
1.2, extrusion method is to put the heated tube blank in the closed extrusion cylinder, and the piercing rod and the extrusion rod move together to extrude the extruded part from the smaller die hole. This method can proce steel pipes with smaller diameter. 2.1 seamless pipe is widely used. General purpose seamless pipes are rolled by ordinary carbon structural steel, low alloy structural steel or alloy structural steel, with the largest output. They are mainly used as pipes or structural parts for conveying fluid
2.2. According to different uses, it can be divided into three types: A. according to chemical composition and mechanical properties; b. Supply according to mechanical properties; c. Supply as per hydrostatic test. If the steel pipe supplied according to class A and class B is used to bear liquid pressure, hydrostatic test shall also be concted
2.3 seamless tubes for special purposes include boiler seamless tubes, geological seamless tubes and petroleum seamless tubes. 3.1 seamless steel pipe can be divided into hot rolled pipe, cold rolled pipe, cold drawn pipe and extruded pipe according to different proction methods
3.2 according to the shape, there are round pipe and special-shaped pipe. In addition to square and rectangular tubes, there are elliptic tubes, semicircular tubes, triangular tubes, hexagonal tubes, convex tubes, plum shaped tubes, etc
3.3 according to different materials, it can be divided into ordinary carbon structure pipe, low alloy structure pipe, high quality carbon structure pipe, alloy structure pipe, stainless steel pipe, etc
3.4 according to the special purpose, there are boiler pipe, geological pipe, oil pipe, etc. Seamless tube according to GB / t8162-2008
4.1, specification: hot rolled tube outer diameter 32 ~ 630mm. The wall thickness is 2.5-75mm. The outer diameter of cold-rolled (cold drawn) pipe is 5-200 mm. The wall thickness is 2.5-12mm
4.2 appearance quality: the inner and outer surface of the steel pipe shall be free of cracks, folds, rolling folds, delamination, hairlines and scabs. These defects shall be completely removed, and the wall thickness and outer diameter shall not exceed the negative deviation after removal
4.3. Both ends of the steel pipe should be cut into right angles and deburred. Gas cutting and hot sawing are allowed for steel pipes with wall thickness greater than 20 mm. By agreement between the supplier and the demander, it may not be cut
4.4. Refer to gb3639-2007 for surface quality of cold drawn or cold rolled precision seamless steel tubes. 5. Chemical composition inspection
5.1. The chemical composition of domestic seamless pipes supplied according to chemical composition and mechanical properties, such as No. 10, 15, 20, 25, 30, 35, 40, 45 and 50 steel, shall comply with GB / t699-88. Imported seamless pipe shall be inspected according to relevant standards specified in the contract. The chemical composition of 09mnv, 16Mn and 15MnV steel shall comply with the provisions of gb1591-79
5.2. Refer to gb223-84 "methods for chemical analysis of iron, steel and alloy" for specific analysis methods
5.3. For analysis deviation, refer to gb222-84 "allowable deviation of chemical composition of samples and finished procts for chemical analysis of steel". 6.1 the domestic seamless pipe supplied according to the performance of the mechanism shall be made of ordinary carbon steel according to class a steel in GB / t700-88 (but the sulfur content shall not exceed 0.050% and the phosphorus content shall not exceed 0.045%), and its mechanical properties shall meet the values specified in the table of gb8162-2008
6.2 the domestic seamless pipe supplied according to the hydrostatic test must ensure the hydrostatic test specified in the standard
6.3 the physical properties of imported seamless pipes shall be inspected according to the relevant standards specified in the contract. 7.1 the import volume of general seamless pipe is very large. The main importing countries are Germany and Japan. European countries such as Romania, Russia, Switzerland, France, Spain, Czech Republic, Yugoslavia, Hungary and other countries have imported. There are also a small number of imports from Argentina, Mexico and other countries in South America
7.2. According to the different requirements of domestic consumers, there are more than 100 imported seamless pipe specifications, including 15922mm, 1595mm and 15918mm. 114.38mm、114.310mm、114.313mm The length is generally 5-8m or 4-7m. Mainly hot rolled carbon structure, and st65. The minimum diameter of imported specification is 305mm and the maximum is 47813mm
7.3. A small number of seamless pipes with small diameter and thin wall were imported from France and Spain, such as 183mm, 223mm, 26.93mm, etc. Implement the general rules of Mannesmann steel pipe plant in Germany
7.4 for seamless pipes imported from Hungary and Japan, refer to din2448 and DIN1629
7.5 in the import claim cases, the main quality problems of imported seamless pipe are: unqualified chemical composition, splitting in flattening test, low tensile strength, serious corrosion and pits, etc. The differences between cold drawn precision steel pipe and ordinary seamless steel pipe are as follows:
1. The main feature of ordinary seamless steel pipe is that there is no welding seam and it can bear greater pressure. The proct can be very rough as cast or cold drawn parts
2. Cold drawn precision steel pipe is a proct that appears in recent years, mainly because of strict tolerance and roughness of inner hole and outer wall dimensions
features of cold drawn (rolled) precision steel pipe: 1. Smaller outer diameter. 2. High precision, can do small batch proction 3. Cold drawing (rolling) finished procts with high precision, good surface quality. 4. The cross area of steel pipe is more complex. 5. The performance of steel pipe is superior, and the metal is dense. According to GB / t3639-2009 (cold drawn or cold rolled precision seamless steel pipe) standard common specifications and dimensions table: Specifications Φ four × zero point five Φ sixteen × zero point five Φ twenty-six × one point eight Φ thirty-five × nine Φ forty-eight × five Φ seventy × two point eight Φ ninety × ten Φ one hundred and thirty × fourteen Φ one hundred and ninety × fourteen Φ four × zero point eight Φ sixteen × zero point eight Φ twenty-six × two Φ thirty-five × ten Φ forty-eight × five point five Φ seventy × three Φ ninety × twelve Φ one hundred and thirty × sixteen Φ one hundred and ninety × sixteen Φ four × one Φ sixteen × one Φ twenty-six × two point two Φ thirty-eight × zero point five Φ forty-eight × six Φ seventy × three point five Φ ninety × fourteen Φ one hundred and thirty × eighteen Φ one hundred and ninety × eighteen Φ four × one point two Φ sixteen × one point two Φ twenty-six × two point five Φ thirty-eight × zero point eight Φ forty-eight × seven Φ seventy × four Φ ninety × sixteen Φ one hundred and forty × two point five Φ one hundred and ninety × twenty Φ five × zero point five Φ sixteen × one point five Φ twenty-six × two point eight Φ thirty-eight × one Φ forty-eight × eight Φ seventy × four point five Φ ninety-five × two Φ one hundred and forty × two point eight Φ one hundred and ninety × twenty-two Φ five × zero point eight Φ sixteen × one point eight Φ twenty-six × three Φ thirty-eight × one point two Φ forty-eight × nine Φ seventy × five Φ ninety-five × two point two Φ one hundred and forty × three Φ two hundred × three point five Φ five × one Φ sixteen × two Φ twenty-six × three point five Φ thirty-eight × one point five Φ forty-eight × ten Φ seventy × five point five Φ ninety-five × two point five Φ one hundred and forty × three point five Φ two hundred × four Φ five × one point two Φ sixteen × two point two Φ twenty-six × four Φ thirty-eight × one point eight Φ fifty × one Φ seventy × six Φ ninety-five × two point eight Φ one hundred and forty × four Φ two hundred × four point five Φ six × zero point five Φ sixteen × two point five Φ twenty-six × four point five Φ thirty-eight × two Φ fifty × one point two Φ seventy × seven Φ ninety-five × three Φ one hundred and forty × four point five Φ two hundred × five Φ six × zero point eight Φ sixteen × two point eight Φ twenty-six × five Φ thirty-eight × two point two Φ fifty × one point five Φ seventy × eight Φ ninety-five × three point five Φ one hundred and forty × five Φ two hundred × five point five Φ six × one Φ sixteen × three Φ twenty-six × five point five Φ thirty-eight × two point five Φ fifty × one point eight Φ seventy × nine Φ ninety-five × four Φ one hundred and forty × five point five Φ two hundred × six Φ six × one point two Φ sixteen × three point five Φ twenty-six × six Φ thirty-eight × two point eight Φ fifty × two Φ seventy × ten Φ ninety-five × four point five Φ one hundred and forty × six Φ two hundred × seven Φ six × one point five Φ sixteen × four Φ twenty-six × seven Φ thirty-eight × three Φ fifty × two point two Φ seventy × twelve Φ ninety-five × five Φ one hundred and forty × seven Φ two hundred × eight Φ six × one point eight Φ sixteen × four point five Φ twenty-six × eight Φ thirty-eight × three point five Φ fifty × two point five Φ seventy × fourteen Φ ninety-five × five point five Φ one hundred and forty × eight Φ two hundred × nine Φ six × two Φ sixteen × five Φ twenty-eight × zero point five Φ thirty-eight × four Φ fifty × two point eight Φ seventy-five × one Φ ninety-five × six Φ one hundred and forty × nine Φ two hundred × ten Φ seven × zero point five Φ sixteen × five point five Φ twenty-eight × zero point eight Φ thirty-eight × four point five Φ fifty × three Φ seventy-five × one point two Φ ninety-five × seven Φ one hundred and forty × ten Φ two hundred × twelve Φ seven × zero point eight Φ sixteen × six Φ twenty-eight × one Φ thirty-eight × five Φ fifty × three point five Φ seventy-five × one point five Φ ninety-five × eight Φ one hundred and forty × twelve Φ two hundred × fourteen Φ seven × one Φ eighteen × zero point five Φ twenty-eight × one point two Φ thirty-eight × five point five Φ fifty × four Φ seventy-five × one point eight Φ ninety-five × nine Φ one hundred and forty × fourteen Φ two hundred × sixteen Φ seven × one point two Φ eighteen × zero point eight Φ twenty-eight × one point five Φ thirty-eight × six Φ fifty × four point five Φ seventy-five × two Φ ninety-five × ten Φ one hundred and forty × sixteen Φ two hundred × eighteen Φ seven × one point five Φ eighteen × one Φ twenty-eight × one point eight Φ thirty-eight × seven Φ fifty × five Φ seventy-five × two point two Φ ninety-five × twelve Φ one hundred and forty × eighteen Φ two hundred × twenty Φ seven × one point eight Φ eighteen × one point two Φ twenty-eight × two Φ thirty-eight × eight Φ fifty × five point five Φ seventy-five × two point five Φ ninety-five × fourteen Φ one hundred and fifty × three Φ two hundred × twenty-two Φ seven × two Φ eighteen × one point five Φ twenty-eight × two point two Φ thirty-eight × nine Φ fifty × six Φ seventy-five × two point eight Φ ninety-five × sixteen Φ one hundred and fifty × three point five Φ eight × zero point five Φ eighteen × one point eight Φ twenty-eight × two point five Φ thirty-eight × ten Φ fifty × seven Φ seventy-five × three Φ ninety-five × eighteen Φ one hundred and fifty × four Φ eight × zero point eight Φ eighteen × two Φ twenty-eight × two point eight Φ forty × zero point five Φ fifty × eight Φ seventy-five × three point five Φ one hundred × two Φ one hundred and fifty × four point five Φ eight × one Φ eighteen × two point two Φ twenty-eight × three Φ forty × zero point eight Φ fifty × nine Φ seventy-five × four Φ one hundred × two point two Φ one hundred and fifty × five Φ eight × one point two Φ eighteen × two point five Φ twenty-eight × three point five Φ forty × one Φ fifty × ten Φ seventy-five × four point five Φ one hundred × two point five Φ one hundred and fifty × five point five Φ eight × one point five Φ eighteen × two point eight Φ twenty-eight × four Φ forty × one point two Φ fifty-five × one Φ seventy-five × five Φ one hundred × two point eight Φ one hundred and fifty × six Φ eight × one point eight Φ eighteen × three Φ twenty-eight × four point five Φ forty × one point five Φ fifty-five × one point two Φ seventy-five × five point five Φ one hundred × three Φ one hundred and fifty × seven Φ eight × two Φ eighteen × three point five Φ twenty-eight × five Φ forty × one point eight Φ fifty-five × one point five Φ seventy-five × six Φ one hundred × three point five Φ one hundred and fifty × eight Φ eight × two point two Φ eighteen × four Φ twenty-eight × five point five Φ forty × two Φ fifty-five × one point eight Φ seventy-five × seven Φ one hundred × four Φ one hundred and fifty × nine Φ eight × two point five Φ eighteen × four point five Φ twenty-eight × six Φ forty × two point two Φ fifty-five × two Φ seventy-five × eight Φ one hundred × four point five Φ one hundred and fifty × ten Φ nine × zero point five Φ eighteen × five Φ twenty-eight × seven Φ forty × two point five Φ fifty-five × two point two Φ seventy-five × nine Φ one hundred × five Φ one hundred and fifty × twelve Φ nine × zero point eight Φ eighteen × five point five Φ twenty-eight × eight Φ forty × two point eight Φ fifty-five × two point five Φ seventy-five × ten Φ one hundred × five point five Φ one hundred and fifty × fourteen Φ nine × one Φ eighteen × six Φ thirty × zero point five Φ forty × three Φ fifty-five × two point eight Φ seventy-five × twelve Φ one hundred × six Φ one hundred and fifty × sixteen Φ nine × one point two Φ twenty × zero point five Φ thirty × zero point eight Φ forty × three point five Φ fifty-five × three Φ seventy-five × fourteen Φ one hundred × seven Φ one hundred and fifty × eighteen Φ nine × one point five Φ twenty × zero point eight Φ thirty × one Φ forty × four Φ fifty-five × three point five Φ seventy-five × sixteen Φ one hundred × eight Φ one hundred and fifty × twenty Φ nine × one point eight Φ twenty × one Φ thirty × one point two Φ forty × four point five Φ fifty-five × four Φ eighty × one Φ one hundred × nine Φ one hundred and sixty × three Φ nine × two Φ twenty × one point two Φ thirty × one point five Φ forty × five Φ fifty-five × four point five Φ eighty × one point two Φ one hundred × ten Φ one hundred and sixty × three point five Φ nine × two point two Φ twenty × one point five Φ thirty × one point eight Φ forty × five point five Φ fifty-five × five Φ eighty × one point five Φ one hundred × twelve Φ one hundred and sixty × four Φ nine × two point five Φ twenty × one point eight Φ thirty × two Φ forty × six Φ fifty-five × five point five Φ eighty × one point eight Φ one hundred × fourteen Φ one hundred and sixty × four point five Φ nine × two point eight Φ twenty × two Φ thirty × two point two Φ forty × seven Φ fifty-five × six Φ eighty × two Φ one hundred × sixteen Φ one hundred and sixty × five Φ ten × zero point five Φ twenty × two point two Φ thirty × two point five Φ forty × eight Φ fifty-five × seven Φ eighty × two point two Φ one hundred × eighteen Φ one hundred and sixty × five point five Φ ten × zero point eight Φ twenty × two point five Φ thirty × two point eight Φ forty × nine Φ fifty-five × eight Φ eighty × two point five Φ one hundred and ten × two Φ one hundred and sixty × six Φ ten × one Φ twenty × two point eight Φ thirty × three Φ forty × ten Φ fifty-five × nine Φ eighty × two point eight Φ one hundred and ten × two point two Φ one hundred and sixty × seven Φ ten × one point two Φ twenty × three Φ thirty × three point five Φ forty-two × one Φ fifty-five × ten Φ eighty × three Φ one hundred and ten × two point five Φ one hundred and sixty × eight Φ ten × one point five Φ twenty × three point five Φ thirty × four Φ forty-two × one point two Φ fifty-five × twelve Φ eighty × three point five Φ one hundred and ten × two point eight Φ one hundred and sixty × nine Φ ten × one point eight Φ twenty × four Φ thirty × four point five Φ forty-two × one point five Φ sixty × one Φ eighty × four Φ one hundred and ten × three Φ one hundred and sixty × ten Φ ten × two Φ twenty × four point five Φ thirty × five Φ forty-two × one point eight Φ sixty × one point two Φ eighty × four point five Φ one hundred and ten × three point five Φ one hundred and sixty × twelve Φ ten × two point two Φ twenty × five Φ thirty × five point five Φ forty-two × two Φ sixty × one point five Φ eighty × five Φ one hundred and ten × four Φ one hundred and sixty × fourteen Φ ten × two point five Φ twenty × five point five Φ thirty × six Φ forty-two × two point two Φ sixty × one point eight Φ eighty × five point five Φ one hundred and ten × four point five Φ one hundred and sixty × sixteen Φ ten × two point eight Φ twenty × six Φ thirty × seven Φ forty-two × two point five Φ sixty × two Φ eighty × six Φ one hundred and ten × five Φ

Cold drawn pipe is a steel pipe without joint on the surface of the whole steel pipe proced by drawing, extrusion, piercing and other methods. It is a kind of round, square and rectangular steel with hollow section and no seam around. It is made of steel ingot or solid tube blank by piercing and then cold drawing. Here we introce the standard of cold drawn pipe

I. cold drawn pipe standard

cold drawn steel pipe should be proced by drawing, extrusion and perforation. In the proction of steel pipe, hollow section should be carried out on one side, and welding round hole should be seen around

we don't know much about the cold drawn pipe. Although we often see its shadow, we don't know how to make it? What are the standards? Today I will introce the standard and price of cold drawn pipe

the raw material of cold drawn pipe is hot-rolled steel pipe. After acid pickling, the oxide scale of hot-rolled steel pipe is removed and cold chain ligation is carried out. The finished proct is hard rolled coil, because in the proction process, continuous cooling makes the steel pipe deformed and then causes cold work hardening, which makes the strength and hardness of hard rolled coil increase and the toughness and plasticity index decrease, Stamping performance is also deteriorating, because it can only be used for simple deformation parts, and rolling coil can also be used as a raw material for hot dip galvanizing plant

because the facilities of hot dip galvanizing line are degraded, so in general, the process of cold drawn pipe is to go through the foundation of pipe failure, then heating, drilling, then annealing, and then pickling, Then there is oiling, that is, copper plating, multi-stage cold drawing, that is to say, cold rolling, and bad pipe and heat treatment. Finally, after straightening, there is hydrostatic test, commonly known as flaw detection, and finally warehousing

cold drawn pipe belongs to mechanical structure. The size, precision and surface smoothness of hydraulic equipment need to be carefully calculated and designed, and precision seamless pipe should be selected to manufacture mechanical structure and hydraulic equipment. In this way, the working hours of mechanical processing can be greatly saved, and the utilization rate of materials can be improved, Appropriate use of goods can also be improved

II. Cold drawn pipe price

domestic and American standard extrusion / cold drawn pressure corrosion resistance 316 310S stainless steel seamless pipe price: 36.00

16Mn large diameter seamless steel pipe cold drawn hot rolled thin wall thick wall seamless steel pipe price: 2.65

astma648-1990a prestressed concrete pipe cold drawn steel wire price: 60 yuan

legitimate GB / t31315-2014 mechanical structure cold drawn or cold rolled precision welded steel pipe price: 12.5 yuan

supply 20 yuan hot rolled seamless steel pipe 45 yuan cold drawn seamless steel pipe 20 yuan seamless pipe Q345B seamless steel pipe price: 3.10 yuan

long term sales 15CrMo alloy seamless steel pipe cold drawn steel pipe factory alloy seamless steel pipe price: 6.50 yuan

through the introction of the above cold drawn pipe standard, I believe you know something about the cold drawn pipe, its proction process is more complex, but the use is very wide, many of our daily construction instry can not do without it, Cold drawn pipe is a new type of high-tech energy-saving proct

For the cold drawing pass of seamless steel pipe, please refer to the following article:

how to determine the cold drawing pass in the process design of seamless steel pipe

I won't say much, you can download the relevant documents and forms