40Cr steel according to the standard GB / T 3077-2008: chemical composition (mass fraction of thick-walled alloy tube,%) C 0.37 ~ 0.44, Si 0.17 ~ 0.37, Mn 0.50 ~ 0.80, Cr0.80 ~ 1.10, Ni≤0.30. [Mechanical properties] sample blank size (mm): 25 Heat treatment: first quenching temperature (℃): 850; coolant: Oil second quenching temperature (℃): - tempering heating temperature (℃): 520; coolant: water, oil tensile strength (σb / MPa): ≧ 980 yield point (σs / MPa): ≧ 785 percentage elongation (δ5 /%): ≧ 9 section shrinkage (ψ /%): ≧ 45 impact energy (Aku2 / J): ≧ 47 Brinell hardness (HBS100 / 3000) (annealing or tempering state): ≦ 207 27simn advantages of hydraulic prop tube compared to mechanical transmission, electric drive, hydraulic drive has the following advantages: 1 27simn hydraulic prop tube alloy tube drive various elements can be easily and flexibly be arranged as needed. 2, light weight, small size, low inertia, fast response. 3, steering control convenience, can achieve a wide range of variable speed (speed range up to 2000: 1). 4, automatic overload protection. 5,27simn hydraulic prop tube generally use mineral oil as the working medium alloy tube, relative motion surface self-lubricating, long life; 6, easy to implement linear motion / 7, it is easy to automate the machine, when combined with the use of electro-hydraulic control , not only to achieve a higher degree of automatic control process, and can achieve remote control alloy tubes | alloy fittings | virtues of Industry (certified merchants) are provided by virtue Liaocheng Industry Co., Ltd. Alloy tubes | alloy fittings | virtues of Industry (certified merchants) is Pipe Co., Ltd. Liaocheng virtue (www.meidegc.com) (www.meidegc.com) (www.mdwfg.com) (www.mdggc.com) this year The new upgrade launch, the above picture is for reference only, please call the telephone or pictures on this page, for the latest information, contact: Hvdroxide.