Good translation of the Metal Products (Shanghai) alloy structural steel company (domestic alloy structural steel / imports of alloy structural steel) 45crni alloy structural steel / steel plate 45crni / 45crni steel bars / 45crni coil / 45crni, steel strip / 45crni steel pipe / 45crni wire (good Translated Metal Products (Shanghai) Co., Ltd.) 
 45CrNi, an alloy structural steel grades of the Chinese national standard. Uniform digital code: A40452. 
 Chemical composition 
 Mass fraction (%): 
 C: 0.42 ~ 0.49 
 Si: 0.17 ~ 0.37 
 Mn: 0.50 ~ 0.80 
 Cr: 0.45 ~ 0.75 
 Ni: 1.00 ~ 1.40 
 Mechanical properties 
 [Sample blank dimensions 
 25mm 
 [Heat] 
 Quenching temperature (° C): 820; coolant: Oil 
 Tempering the heating temperature (° C): 530; coolant: water, oil 
 Mechanical Properties]. 
 Tensile strength (σb / MPa): ≧ 980 
 Yield point (σs of / MPa): ≧ 785 
 ≧ 10 the Elongation (δ5 /%): 
 Section shrinkage rate (ψ /%): ≧ 45 
 Absorbed energy (Aku2 / J): ≧ 55 
 Brinell hardness (HBS100/3000) (annealing or high temperature tempered condition): ≦ 255 
 Key Features 
 Performance and 40CrNi similar, due to the high carbon content, and thus its strength and hardenability slightly increased. 
 Application examples 
 Used in the manufacture of a variety of important quenching and tempering, similar with 40CrNi purposes. Such as the manufacture of the crankshaft of the internal combustion engine, automotive and tractor spindle, connecting rod, valve and bolt. 
 45crni 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. 
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