Alloy structural steel company of excellent translation of Metal Products (Shanghai) (alloy structural steel made / imported alloy structural steel) 20crnimo alloy structural steel / steel plate 20crnimo / 20crnimo steel bars the / 20crnimo coil / 20crnimo strip / 20crnimo steel pipe / wire 20crnimo (good Translated Metal Products (Shanghai) Co., Ltd.) 
 20CrNiMo, an alloy structural steel grades of the Chinese national standard. Unified digital code: A50202 
 20CrNiMo containing molybdenum in addition to a good comprehensive performance and ability to a certain temperature. For the manufacture of turbine gear rotor engine connecting rods and valve cross-section forgings. 
 Chemical composition 
 Mass fraction (%): 
 Carbon C: 0.17 ~ 0.23 
 Silicon Si: 0.17 ~ 0.37 
 Mn Mn: 0.60 ~ 0.95 
 Sulfur S: Allow the residual content of ≤ 0.035 
 Phosphorus P: Allow the residual content of ≤ 0.035 
 Chromium Cr: 0.40 ~ 0.70 
 Nickel Ni: 0.35 ~ 0.75 
 Cu: to allow the residual content of ≤ 0.30 
 Mo Mo: 0.20 ~ 0.30 
 Mechanical properties 
 [Sample blank dimensions 
 15mm 
 [Heat] 
 Quenching temperature (° C): 850; coolant: Oil 
 Tempering the heating temperature (° C): 200; coolant: Empty 
 Mechanical Properties]. 
 Tensile strength σb (MPa): ≥ 980 (100) 
 Yield strength σs (MPa): ≥ 785 (80) 
 Elongation δ5 (%): ≥ 9 
 Reduction of area ψ (%): ≥ 40 
 Impact energy Akv (J): ≥ 47 
 Impact the toughness the value αkv (J/cm2): ≥ 59 (6) Brinell hardness (HBS100/3000,) (annealing or high temperature tempered condition): ≦ 197 
 Delivery status: to heat treatment (normalizing, annealing, or high-temperature tempering) or heat treatment state of delivery, the delivery status should be indicated in the contract. 
 Key Features 
 20CrNiMo steel former U.S. AISI, the SAE standard steel 8720. Hardenability of similar performance 20CrNi steel. Ni content in the steel for half of the 20CrNi steel, but because of a small amount of Mo, so that the upper part of the austenite and isothermal transformation curve to the right; because of an appropriate increase in Mn content, resulting in the hardenability of this steel is still good, the intensity than high 20CrNi steel. Commonly used in the manufacture of small and medium-sized car, the tractor engine and transmission gear; can instead of 12CrNi3 steel manufacturing requirements of high performance of the heart of the Ministry of carburizing, cyanide, such as oil drilling and metallurgical open pit cone bit teeth claws and cone body. 20CrNiMo containing molybdenum in addition to a good comprehensive performance and ability to a certain temperature. For the manufacture of turbine gear rotor engine connecting rods and valve cross-section forgings. 
 Application examples 
 Commonly used in the manufacture of small and medium-sized car, the tractor engine and transmission gear instead of 12CrNi3 steel manufacturing requirements of high performance of the heart of the Ministry of carburizing, cyanide, such as oil drilling and metallurgical open pit with teeth claws and The cone body. 
 20CRNIMO 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. 
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