YUTONG INDUSTRY/STKM13C Seamless Honed Tube/ Large bore cylinder barrel ...

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The Hardness Of 4140 Chrome Cylinder Rod

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  4140 chrome cylinder rod   is used extensively by the hydraulic cylinder and pneumatic industries, and is employed by other industry sectors for a wide range of applications requiring higher strength. 4140 is a 1% Chromium - Molybdenum high tensile steel supplied in the hardened and tempered, cold drawn or turned, precision ground, polished, chrome plated and final polished condition, with a typical base metal tensile strength of 850 - 1000 Mpa, plus a typical  hard chrome plated surface hardness  of HV 1000 - 1150. Characterized by an extremely smooth surface finish with excellent wear and corrosion resistance, coupled with a base material giving high strength and good impact properties. 4140  hard chrome plated bar  has very good machinability, similar to 4140 uncoated bar. Machining however should commence beneath the chrome plating, or at the unchromed surface at the end of the bar. To protect the polished chrome surface, soft materials such as copper...
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The Hardness Of 40cr Hard Chrome Plated Rod

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 When selecting materials for high-strength, wear-resistant components like shafts, pins, or hydraulic rods , the choice between ​40Cr​ and ​4140 alloy steel​ is critical. Both are widely used in industrial applications, but their distinct chemical compositions, mechanical properties, and heat treatment responses make them better suited for specific use cases. As a leading manufacturer of ​ 40Cr hard chrome plated rods , we break down these differences to help you optimize your material selection—and explain why our precision-engineered rods outperform competitors. 40Cr (GB/T 3077 Standard)​ ​ ​Carbon (C)​: 0.37–0.44% (medium carbon for balanced strength and machinability). ​Chromium (Cr)​: 0.8–1.1% (enhances hardenability and surface wear resistance). ​Other elements: Manganese (Mn) 0.8–1.1%, silicon (Si) 0.17–0.37%, with minimal impurities (e.g., sulfur ≤0.035%). ​ 4140 (ASTM A29/A1085 Standard, Equivalent to China’s 42CrMo)​ ​ ​Carbon (C)​: 0.38–0.43% (similar to 40Cr but slight...
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High Precision SAE4340 Chrome Plated Rod For Hydraulic Cylinder Use

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  SAE 4340 chrome plated rod is a type of round steel rod used in many different industries, such as automotive, construction, aerospace, and especially telescopic custom hydraulic cylinder applications. It has a high tensile strength, so it will not deform when put under pressure. This steel also has a low carbon content, making it solid and durable but lightweight. 4340 steel is one of the most common grades of steel used for machine and manufacturing cylinders applications due to the excellent strength/weight ratio makes it a popular choice for many machinery, vehicles, and structures. The 4340 steel is a type of steel with high strength and toughness. The 4340 round bar Steel is also called “chrome molybdenum” because it has a higher content of chromium and molybdenum than other types of steel. The SAE4340 cylinder round bar after hard chromed has a yield strength of about 100,000 psi, whereas the yield strength for other types of steel ranges from about 60,000 to 80,000 psi....
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