Good translation of the Metal Products (Shanghai) spring steel (made spring steel / import spring steel) 50CrVA spring steel / 50CrVA plate / 50CrVA steel bars 50CrVA coil / 50CrVA strip / 50CrVA, steel pipe / 50CrVA wire (best translated Metal Products (Shanghai ) Co., Ltd.) 
 Grade: 50CrVA 
 Standard: GB / T 1222-1984 
 50crva Overview 
 Features and Scope: 
 Good mechanical and technological properties, hardenability higher, adding vanadium steel grain refinement to reduce the thermal sensitivity, improved strength and toughness, high fatigue strength, yield a higher ratio, but the poor weldability , cold deformation plasticity. A higher spring, as a larger cross-section of high-load spring and the operating temperature <300 ° C, valve springs, piston spring safety valve spring. 
 In general, the supplier specifications for the 1.5 ~ 10.0MM multi-annealed condition. Coil for hot-rolled, the ball annealing to reduce hardness in order to create conditions for further processing. 
 Chemical composition: 
 Carbon C: 0.46 to 0.54 
 Silicon Si: 0.17 ~ 0.37 
 Mn Mn: 0.50 ~ 0.80 
 Sulfur S: ≤ 0.030 
 Phosphorus P: ≤ 0.030 
 Chromium Cr: 0.80 ~ 1.10 
 Ni - Ni: ≤ 0.35 
 Copper Cu: ≤ 0.25 
 Vanadium V: 0.10 ~ 0.20 
 Physical properties 
 Mechanical properties: 
 Σb (MPa), tensile strength: ≥ 1 274 (130) 
 Yield strength σs (MPa): ≥ 1127 (115) 
 The elongation δ5 (%): ≥ 10 
 Reduction of area ψ (%): ≥ 40 
 Hardness: hot, ≤ 321HB; Cold Drawn + heat treatment, ≤ 321HB 
 Heat treatment and microstructure: 
 Specification of the heat treatment: quenching 850 ° C ± 20 ° C, cold oil; tempering 500 ° C ± 50 ° C (special needs, ± 30 ° C). 
 50crva said method 
 ① steel beginning of the two figures, said the carbon content of steel, the average carbon content of the very few, such as 40Cr, 25Cr2MoVA alloy tube ② steel alloying elements, in addition to the individual micro-alloying elements, generally a few percent said. When the average alloy content <1.5%, steel, generally mark the element symbol not indicate the content and prone to cause confusion, but in exceptional circumstances, after the element symbol can also be marked with the number "1", such as steel "12CrMoV" and "12Cr1MoV", the former chromium content of 0.4-0.6% and 0.9-1.2%, and the remaining ingredients are all the same. When the average content of alloying elements ≥ 1.5% ≥ 2.5% ≥ 3.5% ... in the back of the element symbols should be marked content, can be said that the corresponding 2,3,4 and so on. For example 18Cr2Ni4WA. 
 ③ steel, vanadium V, titanium Ti, aluminum AL, boron B, rare earth RE alloying elements are micro-alloying elements, although the content is very low, should still be marked in the steel. 20MnVB steel. Vanadium 0.07-0.12%, 0.001-0.005% boron. 
 ④ High quality steel in the steel and finally add the "A", to distinguish them from the general high quality steel. 
 ⑤ special purpose alloy structural steel, steel, dubbed (or suffix) on behalf of the steel use the symbol. Such as Heading a dedicated 30CrMnSi steel, steel ML30CrMnSi. 
 The company provides domestic and imported spring steel varieties, complete specifications, special specifications can be customized processing. Division I and the original certificates, material certificates (chemical composition, mechanical properties) of the class parameters Please pay attention to obtain a copy of the public are welcome to the user to inquire Order, the Company will be free shipping! Other materials, if necessary, good translation 
 Customers in ordering materials, the need to sample customers, please note, MOQ: 50KG (包邮) the number of excellent price, welcome you to call to order this material Our commitment: quality assurance Cheaper prices, excellent! Honesty! 

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