Cold drawn steel process and advantages, what is the difference between cold drawn steel and hot rol

Cold drawing is usually done in the case of ambient room temperature, so that the steel.

The material is fed into a precise mold pattern that has been prepared in advance. Through the advanced high-end technology of cold extrusion, the tensile stress of the yield point strength of the steel bar exceeds the tensile stress value of the original inherent yield point strength of the steel bar, and then the corresponding shape stretching of the steel bar is forcibly made. The steel bar has a plastic deformation that has not been available before, so as to achieve the purpose of continuously improving the yield point strength of the steel bar and saving materials.

Let's take a look at the processing technology and advantages of cold drawing.

Advantages of cold drawn steel

Variety of shapes and specifications

By designing molds of different shapes, cold drawn steel with different cross-sectional shapes and tolerances of different specifications is cold-drawn. The angle can be designed as a right angle or a rounded corner.

High precision

The use of high-quality carbide molds and professional mold repairers ensure accurate and uniform tolerances.

The surface is smooth

The advanced cold extrusion process makes the surface of the cold drawn steel product smooth and bright.

Significant material savings

The cold drawing process is to deform the raw materials by cold extrusion to achieve the required shape, specifications and tolerances, and the loss of raw materials is very small, compared to the use of traditional lathes.

The material saved by cold drawing is very considerable, especially when the amount of material is large, and the material cost savings are more significant.

Savings in processing time and processing machinery

Due to the accurate accuracy and good surface condition, the cold-drawn steel products can be used directly, such as spraying, sanding, bending, drilling, or direct electroplating after fine drawing according to the actual requirements, eliminating a lot of machining time and saving the cost of configuring processing machinery.

The process of cold drawing steel:

First Cold Draw Effect:

Take a steel bar and apply tensile stress to it for cold pulling, and the steel bar will be deformed (and made as a stress-strain diagram). With the increase of tensile stress, the tensile stress experienced by the reinforcement gradually increases. When the tensile stress generated inside the steel bar exceeds the yield point A of the steel bar, and reaches C, the cold drawing is stopped and the load is removed.

At this time, it can be seen that the steel bar has been plastically deformed, and there is a change in the stress-strain diagram during the unloading process, and the straight line O1C is slower than the straight line OA.

2.Second Cold Pull Effect:

The tensile stress is reapplied to stretch the reinforcement to failure, and the stress-strain diagram has a new change, and the new yield point is near point C, which is significantly higher than the original yield point A. This change shows that the plasticity of the steel bar has changed, the plasticity is smaller, the hardness is larger, and the strength of the steel bar is improved, which is called "deformation hardening".

Through advanced high-end cold extrusion technology and precise and beautiful mold patterns, cold drawing can be turned into a wide variety of steel metal products, and these metal products also have their own advantages of high precision, smooth surface and various forms. Cold drawing products are widely used in life, mainly reflected in mechanical equipment, electrical product parts, furniture.

1. In the process of making cold-drawn steel, only need to adjust the size and specifications of the mold to produce cold-drawn steel products of different shapes and sizes, and the design of the mold can be designed into a variety of different shapes such as right angles and fillet corners, which has a high degree of flexibility and meets the requirements of actual production.

2. The cold-drawn round steel has a high degree of accuracy, and the special mold repair staff designs and produces the mold accurately to ensure that the tolerance of the actual production is accurate and unified, so as to produce cold-drawn steel products with uniform specifications.

3. The surface of the cold-drawn steel is smooth, which causes the extrusion of the inner surface of the high-precision mold when passing through the mold, and the surface presents a highly smooth effect.

4. The cold drawn steel treated by the cold drawing process can make full use of the steel material, and the trimming work is basically omitted in the production, thereby reducing the loss of raw material steel, and the wear and tear generated during cutting and processing is very small, so the saving of materials in the production of cold drawn steel is very objective.

5. Due to the accurate precision and good surface condition, the cold-drawn steel products can be used directly, such as spraying, sanding, bending, drilling, or direct electroplating after fine drawing according to the actual requirements, eliminating a lot of machining time and saving the cost of configuring processing machinery.

1. Nature. Cold drawing steel is to forcibly stretch the steel bar under normal temperature conditions with tensile stress that exceeds the yield point strength of the steel bar that has been defeated in the field, so as to produce plastic deformation of the steel bar, so as to improve the yield point strength of the steel bar and save steel.

Hot-rolled steel is steel that is rolled by heating at high temperatures.

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Hot-rolled steel: <>

2. Features. Cold drawn steel: diversity of shapes and specifications; By designing molds of different shapes, cold drawn steel with different cross-sectional shapes and tolerances of different specifications is cold-drawn.

The angle can be designed as a right angle or a rounded corner. The use of high-quality carbide molds and professional mold repairers ensure accurate and uniform tolerances. The advanced cold extrusion process makes the surface of the cold drawn steel product smooth and bright.

Hot-rolled steel: the strength is not very high, the plasticity and weldability are good, and the material needs to be heated during the rolling process or before the rolling process; Generally, it is heated above the recrystallization temperature before rolling.

3. Application. Cold drawn steel: widely used in machinery and equipment, such as woodworking machinery, ceramic machinery, papermaking machinery, glass machinery, food machinery, construction machinery, plastic machinery, textile machinery, jacks, hydraulic presses, etc.; It is also used in electrical product parts

Motor shafts, fan shafts, sewing machine shafts, etc.

Hot-rolled steel: It is widely used in manufacturing industries such as ships, automobiles, bridges, construction, machinery, pressure vessels, etc.

Encyclopedia - Cold Drawn Steel.

Encyclopedia - Hot rolled steel.

First, the concept is different.

1. Cold drawn steel: Cold drawn steel is under normal temperature conditions, with tensile stress exceeding the original yield point strength of the steel bar, forcibly stretching the steel bar, so that the steel bar produces plastic deformation, so as to improve the yield point strength of the steel bar and save steel for the purpose.

2. Hot-rolled steel: Hot-rolled steel is a steel that is rolled by heating at high temperature. The material needs to be heated during or before the rolling process. It is heated above the recrystallization temperature before rolling.

Second, the process is different.

1. Cold drawn steel: for the purpose of saving steel and improving the yield strength of steel bar, the tensile stress that exceeds the yield strength and is less than the ultimate strength stretches the steel bar to make it produce plastic deformation.

2. Hot-rolled steel: hot-rolled steel strip continuous hot-dip dipping is a new process for the production of hot-dip galvanized sheet, the application of this process greatly improves the efficiency of steel strip production, and is of great significance to ensure the quality of steel strip.

Hot-rolled steel strip continuous hot-dip galvanizing production was produced in Japan in the 70s, the technology is an important innovation to improve the production technology of steel strip, in the context of higher and higher requirements for the quality of hot-dip galvanized sheet, strengthening the research of hot-rolled steel strip continuous hot-dip galvanizing technology has become an inevitable choice for iron and steel enterprises.

Third, the application is different.

1. Cold drawn steel: woodworking machinery, ceramic machinery, papermaking machinery, glass machinery, food machinery, construction machinery, plastic machinery, textile machinery, jacks, hydraulic presses, etc.; Electrical product parts: motor shafts, fan shafts, sewing machine shafts, etc.; Furniture:

In particular, it exports metal furniture, such as coffee tables, chairs, outdoor furniture.

2. Hot-rolled steel: metal appliances: garden tools, barbecue grill grids, screws.

anti-theft locks, etc.; Small hardware parts: such as guide rails, machine keys, nuts, screws, round nails, hexagonal nails, octagonal nails and a variety of standard parts of different specifications; Automobile, motorcycle spare parts, etc.

The best comprehensive performance of these four steels is forged steel, which has good plastic toughness and high strength; The cost of cast steel is lower, but the performance is not as good as that of forged steel, so it is necessary to pay attention to defects such as porosity and cracks, and it is suitable for appearance.

Cold drawing is to forcibly stretch the steel bar under the tensile stress exceeding the original yield point strength of the steel bar under normal temperature conditions, so that the steel bar produces plastic deformation, so as to improve the yield point strength of the steel bar and save steel.

Hot-rolled steel is a steel rolled by high temperature heating, its strength is not very high, but it is enough to meet our use, its plasticity, weldability is good, so we are more commonly used; Cold-rolled steel is a steel that exceeds the strain hardening stage of ordinary hot-rolled steel after strong drawing, and its strength is very high, but the toughness and weldability are poor, and it is relatively hard and brittle.

Summary. Hello, cold drawn steel does not need to be quenched and tempered for the following reasons:

Most of the cold-rolled steel unconditioned parts work under a relatively small dynamic load, they bear the action of tension, compression, bending, torsion or shear, and some surfaces also have friction, requiring a certain degree of wear resistance and so on. In short, the parts work under various compound stresses. This type of parts is mainly the structural parts of various machines and mechanisms, such as shafts, connecting rods, bolts, gears, etc., which are commonly used in manufacturing industries such as machine tools, automobiles and tractors.

Why don't you quench and temper cold drawn steel.

Hello, the reasons why cold-drawn steel does not need to be quenched and tempered are as follows: cold-rolled steel is not rough and most of the quenched and tempered parts work under a relatively small dynamic load, they bear the action of stretching, compression, bending, torsion or shearing, and some surfaces also have friction, requiring a certain degree of wear resistance and so on. In short, the parts work under various compound stresses.

The stool parts are mainly structural parts of various machines and mechanisms, such as shafts, connecting rods, bolts, gears, etc., which are commonly used in manufacturing industries such as machine tools, automobiles and tractors.

In fact, whether cold-rolled steel is quenched or tempered generally depends on its working conditions. Most of the quenched and tempered parts work under the action of relatively large dynamic loads, and they bear the action of tension, compression, bending, torsion or shearing, and some surfaces also have friction, requiring a certain degree of wear resistance and so on. In short, the parts are working under various compound stresses.

This type of parts is mainly the structural parts of various machines and mechanisms, such as shafts, connecting rods, bolts, gears, etc., which are commonly used in manufacturing industries such as machine tools, automobiles and tractors. Especially for large components in heavy machine manufacturing, quenching and tempering treatment is generally used more delicately.

Why don't you use quenching and tempering when processing parts of No. 45 steel cold-drawn round bar?

The reasons are as follows: No. 45 steel is a medium-carbon structural steel, with good cold and hot processing performance, and good mechanical performance, and low and wide, so it is widely used. Its biggest weakness is that it has low hardenability, large cross-sectional size and relatively high requirements of the workpiece should not be used.

Cold drawn hexagonal steel is the use of cold extrusion technology, through a precise mold, to pull out all kinds of high-precision, smooth surface hexagonal steel. Products are widely used in machinery manufacturing, light industry, hardware, standard parts, bicycles, automobiles, motorcycles, textile machinery, transformers and other machinery industries. Diversity of shapes and specifications of cold-drawn square steel.

By designing molds of different shapes, cold drawing out different cross-sectional shapes, different sizes and specifications tolerances. The angle can be set to a right angle or a rounded corner. High precision

The use of high-quality cemented carbide molds and professional and technical personnel to achieve accurate and uniform tolerances. The surface is smoothThe advanced cold-drawn process makes the surface of cold-drawn steel products smooth and bright.

Significant material savingsCold drawn steel is the raw material cold extrusion deformation to the required shape, the required specifications and tolerances, the loss of raw materials is very little, relative to the use of traditional lathe machining and cutting of the loss of materials, the cold drawn steel saved material is very considerable, especially when the amount of material is large, the saving of material cost is more significant. Processing time and processing machinery savings Due to the accurate accuracy and good surface condition, cold-drawn steel products can be used directly, such as spraying, sanding, bending, and drilling, which can also be directly electroplating after fine drawing according to actual requirements, eliminating the need for a large number of processing Specifications of light square iron standing stock:

4*4 5*5 6*6 7*7 8*8 9*9 10*10 12*12 13*13 14*14 15*15 16*16 18*18 19*19 20*20 22*22 25*25 30*30 32*32 35*35 40*40 45*45 50*50 60*60…Specifications of light round iron standing stock: 3 4 5 6 7 8 9 10 11 12 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 32 35 36 38 40 45 47 50 55 60 Typical uses of cold-drawn steel products: machinery and equipment; electrical product components; Furniture:Tool; small hardware spare parts; décor and household items; Automobile, motorcycle spare parts, etc.

Square billet Heating Perforation Three-high skew rolling, continuous rolling or extrusion Desteeling Sizing Cooling Straightening Hydrostatic test Marking Warehousing. The raw material of rolled square steel is a square steel billet, and the square steel billet is cut by a cutting machine to process a billet with a length of about 1 meter, and sent to the furnace for heating by a conveyor belt. The billets are fed into a furnace and heated at a temperature of about 1,200 degrees Celsius.

The fuel is hydrogen or acetylene. Temperature control in the furnace is a key issue.

If there are cracks, bubbles and other problems inside the square steel during the production, it will be detected. After the quality inspection of the square steel, it must be strictly selected by hand. After the quality inspection of the square steel, spray the number, specification, production batch number, etc. with paint. and lifted into the warehouse by crane.