The Advantages And Disadvantages Of Cold-drawn Alloy Steel Wire

The advantages and disadvantages of Cold-drawn Alloy Steel Wire
 The Cold-drawn Alloy Steel Wire has high strength and hardness, high elastic limit and fatigue limit (especially the notch fatigue limit) after proper heat treatment or cold drawing hardening, but the cutting performance is acceptable, but the welding performance and cold plastic deformation resistance are poor The Because of the high carbon content, water quenching is easy to produce cracks, so the use of two-liquid quenching (water quenching oil cold), small cross-section parts using oil quenching. This type of steel is usually quenched by tempering or normalizing or quenching in the surface use. Mainly used in the manufacture of spring and wear parts. Carbon tool steel is basically not added alloying elements of cold drawn alloy steel wire, tool steel is also a low cost, good hot and cold processing, the use of a wide range of steel. Its carbon content in 0.65 to 1.35%, is dedicated to the production of steel tools. Cold drawn alloy steel wire density 7.81g / cm ?. Can be used for the production of fishing gear.
advantage:
1, after heat treatment can get high hardness (HRC60 a 65) and good wear resistance.
2, the annealing state of moderate hardness, with good machinability.
3, raw materials easy to get, low production costs.
The downside is:
1, hot hardness is poor, when the tool working temperature is greater than 200 ℃, its hardness and wear resistance decreased sharply.
2, low hardenability. Water quenching completely quenched when the diameter is generally only 15 to 18mm; oil quenching completely quenched when the maximum diameter or thickness (95% martensite) is only about 6mm, and easy to crack.
The hardness and strength of the cold drawn alloy steel wire are mainly determined by the amount of carbon dissolved in the steel and the increase of the carbon content. When the amount of dissolved carbon exceeds 0.6%, the hardness does not increase after quenching, but the amount of excess carbides increases, the wear resistance of steel increases slightly, while the plasticity, toughness and elasticity decrease. To this end, often according to the use of conditions and the strength of steel, toughness to match the selection of different steel. For example, the manufacture of less force of the spring or spring-type parts, you can choose a lower carbon 65 steel. General Cold-drawn Alloy Steel Wire can be used electric furnace, flat furnace, oxygen converter production. Requires high quality or special quality can be used when the furnace smelting vacuum consumption or electroslag remelting. Metallurgical, strict control of chemical composition, especially sulfur and phosphorus content. In order to reduce segregation and improve the equivalent performance, the ingot can be subjected to high temperature diffusion annealing (particularly important for tool steels). Thermal processing, eutectoid steel forging (rolling) temperature requirements (about 800 ℃), forging into the material should be avoided after the coarse network of carbide precipitation, below 700 ℃ should be noted that slow cooling to prevent thermal stress Cause crack. Heat treatment or thermal processing to prevent surface decarburization (especially important for spring steel). Hot work to have enough compression ratio to ensure the quality of steel and the use of performance.
 Cold-drawn alloy steel wire with anti-cracking, strong impact resistance, high wear resistance, and cement affinity, can increase the strength of components, to extend the service life, etc. In recent years, water conservancy projects gradually attention, especially in the south, Often use the cold-drawn alloy steel wire is one of the commonly used reinforcement products, the effect is also very significant.First play a very good support, protection. Cold-drawn alloy steel wire concrete tensile, bending , The high shear strength, the protection of the integrity of the mountain slope and other projects, cold drawn alloy steel wire in the chaotic distribution of cold drawn alloy steel wire is the main role is to impede the expansion of microcracks within the concrete and block the occurrence and development of macroscopic cracks.