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Henan Friend Metal Products Co.,Ltd

Classification of carbon steel wire

General purpose low carbon steel wire

Is the largest yield of steel in a variety, its diameter between 0.16 ~ 10mm. It can be divided into surface by surface and galvanized two, according to the delivery status is divided into cold and annealing two. Cold drawn steel tensile strength, do the general use is% 26le; 635 ~ 1000MPa; nail with% 26le; 540 ~ 1320MPa. The larger the wire diameter, the smaller the tensile strength. But the construction of cold drawn steel wire tensile strength of not less than 635MPa. The tensile strength of the annealed steel wire is between 295 and 500 MPa. Select the raw materials, from the maintenance of the flexibility of the wire to consider, in order to prevent the high tensile strength, wire diameter of small carbon content should be low; but the larger specifications of the nail with silk, you need to use high carbon content , So that the steel wire in the punch when bending. Generally in the production of non-nail with the smooth steel wire, the wire rod can be used mechanical descaling (see wire rod mechanical descaling) and without coating treatment (see lubrication carrier) to pull. In the production of nails or galvanized steel wire, because of its surface quality requirements are higher, usually the machine after the mechanical descaling after a little pickling and through the yellow and lime coating treatment, to pull pull. As the low-carbon steel wire plasticity, deformation resistance is small, so pull a drawing when the total reduction rate (see area reduction rate) can be achieved, up to 95% or so. The reduction rate for each pass is generally% 26le; 35%. General use of low-carbon steel wire in the galvanized before the heat treatment or drawing between the middle heat treatment, commonly used recrystallization annealing and extensive use of continuous furnace annealing and furnace furnace annealing in two ways. Continuous furnace annealing and continuous hot-dip galvanizing or galvanizing composition of the continuous operation line; well furnace annealing is used in non-continuous operation of the production line.

Galvanized low carbon steel wire for overhead communication

The resistivity has strict requirements, so the chemical composition of raw materials must ensure that the finished wire resistivity qualified. Wire surface treatment, drawing and heat treatment process and general use of low carbon steel wire is similar, but requires a thick zinc layer, and some in the galvanized after the passivation treatment, that is, after the galvanized steel wire immersed in chromic acid, sulfuric acid And nitric acid in the mixed solution, so that the surface of the zinc layer to form a rainbow or light yellow, light green, light red and other mixed color passivation film to further improve the corrosion resistance of steel wire. Galvanized steel wire for annealing. Finished tensile strength of 345 ~ 490MPa armored cable galvanized low-carbon steel wire also requires a thick zinc layer, and some also require passivation after galvanizing.

Important use of low carbon steel wire

There are two kinds of smooth and galvanized. Galvanized steel wire zinc thinner. The tensile strength of the smooth steel wire is% 26ge; 390MP. The tensile strength of galvanized steel wire.

High quality low carbon structural steel wire

Made of carbon structural steel, delivered in hard or soft condition. Hardness of the wire tensile strength between 540 ~ 980MPa; soft state wire tensile strength between 440 ~ 785MPa, the specific requirements determined by the steel and wire diameter. The cross section of the wire is round, square and hexagonal. The surface state of the wire is divided into two types: cold drawn and silver. Silver bright wire should have a higher dimensional accuracy and surface quality, the surface smooth and shiny, no use of harmful surface defects. The diameter of the wire delivered in the dish state is generally 1 mm or less.

Bearing retainer and cold forging for low carbon structural steel wire

Are made of riveting steel. The low magnification test of steel should be no shrinkage, bubble, stratification, crack and non-metallic inclusions. The diameter of the wire for the bearing holder is o. 75 ~ 12. Omm, tensile strength between 390 ~ 735MPa, the wire size and surface quality of the higher requirements of the cold-drawn state or tempering (wire diameter% 26le; 2mm) state delivery. Cold forging wire diameter is generally l ~ 16ram, also requires a higher dimensional accuracy, surface quality and low magnification organization, the tensile strength of 420 ~ 735MPa. Diameter less than and equal to 2mm of steel to test the cross-section shrinkage, its value shall not be less than 35% to 50%. Diameter greater than and equal to 3mm of the wire but also to do cold forging test, the general requirements of the cold forged to the original height of the sample 26divide; when no cracks and cracks. The microstructure of the wire should be ferrite and spherical pearlite, for this wire rod or by the wire rod after the semi-finished products to be spherical annealing. In order to obtain good surface quality and spheroidized organization, to improve the toughness of steel wire, the production of cold forging wire is usually used in larger diameter wire rod to increase the total reduction rate and the number of intermediate annealing. The surface quality of the cold forged steel wire is also related to the quality of the pickling, and the acidity of the wire is reduced by pickling and pickling. In order to prevent the hydrogen embrittlement caused by hydrogen embrittlement and affect the cross-section shrinkage of the wire, after pickling to fully bake. Finished drawing 134, in order to ensure a higher surface quality, should adopt a smaller pass minus the rate. Finished product drawing the total reduction rate is generally less than 60%, to ensure cold forging performance.

The carbon wire is made of a dedicated carbon structural steel and is delivered in a cold drawn state. For high-strength welding wire, should minimize its hydrogen content, in order to prevent cold cracks in the weld. To this end, the requirements of the wire surface clean, less attached material to reduce the welding of molten metal when the diffusion of hydrogen content. In addition, a reasonable choice of drawing lubricant is also one of the key to obtain low hydrogen electrode wire.

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