Good translation of the Metal Products (Shanghai) alloy structural steel company (domestic alloy structural steel / imports of alloy structural steel) 30Mn2 alloy structural steel / 30Mn2 steel plate / 30Mn2 steel bars / 30Mn2 coil / 30Mn2 strip / 30Mn2 steel pipe / 30Mn2 wire (good Translated Metal Products (Shanghai) Co., Ltd.) 
 Outline 
 30Mn2, alloy structural steel. 
 Standard: GB / T 3077-1988 
 Chemical composition: 
 Carbon C: 0.27 ~ 0.34 
 Silicon Si: 0.17 ~ 0.37 
 Mn Mn: 1.40 ~ 1.80 
 Sulfur S: allow the residual content of ≤ 0.35 
 Phosphorus P: allow the residual content of ≤ 0.35 
 Chromium Cr: Allow the residual content of ≤ 0.30 
 Ni: to allow the residual content of ≤ 0.30 
 Cu: to allow the residual content of ≤ 0.30 
 20mn2 said method 
 ① steel beginning of the two numbers indicate 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 individual micro-alloying elements, generally a few percent. 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. Case 
 [(OD - Wall Thickness) * Wall thickness] * 0.02466 = kg / m (the weight per meter) 
 Mechanical properties 
 Sample blank size (mm): 25 
 Heat treatment: 
 First quenching temperature (° C): 840; coolant: water 
 Second quenching temperature (℃): - 
 Tempering the heating temperature (° C): 500; coolant: water 
 Tensile strength σb (MPa): ≥ 785 (80) 
 Yield strength σs (MPa): ≥ 635 (65) 
 Elongation δ5 (%): ≥ 12 
 Reduction of area ψ (%): ≥ 45 
 Impact energy Akv (J): ≥ 63 
 Impact the toughness the value αkv (J/cm2): ≥ 78 (8) 
 Brinell hardness (HBS100/3000) (annealing or high temperature tempered condition): ≦ 207 
 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. 
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 (Good translation of the Metal Products (Shanghai) Co., Ltd. published) 
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