DATONG 4140 4130 4340 hard chrome rod/hardness testing/hard chromed bar/induction hardened Q+T

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Telescopic Hydraulic Cylinder Application And Pressures

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  A  telescopic hydraulic cylinder  can be used in several types of applications that require a linear force to be applied over a long distance. While a rod cylinder could potentially perform the job it may be too long when fully collapsed, where as a telescopic cylinder will typically be significantly shorter when in the same position. The collapsed package size plus long stroke capability of a telescopic cylinder is one of the advantages the design offers over a rod cylinder. Rod cylinders will apply the same force throughout their stroke, assuming that system pressure remains constant. While it is possible to design a telescopic cylinder that applies a constant force, the cost is significantly increased. Generally a  telescopic cylinder  will be used in applications where a constant force is not required. Both single acting and double acting telescopic cylinders are used in non-constant force applications. The most common of these in mobile applications are d...
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Inspection steps of 4140 hard chrome plated bar

1. After the  4140 hard chrome plated bar  piston is processed, the water pressure experiment should be stopped, and the water pressure is generally L 5 times the maximum working pressure. 2. When the chromium-plated rod piston shows cracks, it should generally be scrapped; the cylindrical surface of the piston is worn due to the friction of the piston ring, which is usually not repaired; when the diameter of the cylinder bore is increased, it needs to be selected according to the increased diameter New bracket; repair only when the chrome-plated rod piston is worn or the chrome-plated rod piston ring groove and cylindrical piston pin hole are worn. 3. When the chrome-plated rod piston is scratched or scratched, you can first use a file to file the abrasion and nodules carefully, and then use a whetstone to quietly polish and lubricate.
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The Induction Hardening Of AISI 4140 Chrome Bar

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 As we all know , When the specific pressure in service is very high or there is a risk to damage the chromium plated surface by shocks or abrasions, it is advisable to use the induction hardened AISI 4140 chrome bars . In this case the chromium overlay receives a better support by the hardened base material and is, therefore, less delicate. Why Induction Hardening? Our controlled induction hardening process ensures: Targeted Hardening: Only the working surface is hardened (HRC 58-62), preserving core ductility. Uniform Case Depth: Precise electromagnetic induction achieves consistent case depth (0.8–1.2 mm), mitigating distortion risks. Thermal Efficiency: Faster than traditional furnaces, with minimal decarburization. The Technical of AISI 4140 Chrome bars Material Composition & Performance. 4140 Alloy Steel: A chromium-molybdenum steel (0.75–1.00% Cr, 0.15–0.30% Mo) offering exceptional tensile strength (≥980 MPa) and torsional rigidity. Chrome Plating: A 50-100 µm thick chr...
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