Good translation of the Metal Products (Shanghai) alloy structural steel alloy structural steel in (Domestic alloy structural steel / imports of alloy structural steel) 30crmoa / 30crmoa steel plate / 30crmoa steel bars / 30crmoa coil / 30crmoa strip / 30crmoa steel pipe / 30crmoa wire (good Translated Metal Products (Shanghai) Co., Ltd.) 
 30CrMoA alloy tube 
 30CrMoA alloy tube carbon 0.26 to 0.34, silicon 0.17 to 0.37, manganese 0.40 to 0.70, molybdenum 0.15 to 0.25, chromium 0.80 to 1.10, 
 Standard: GB / T 3077-1988 
 ① steel beginning of the two numbers indicate the carbon content of steel, the average carbon content of the very few, such as 40Cr, 30CrMoA 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. Such as Heading a dedicated 30CrMnSi steel, steel ML30CrMnSi. 
 Alloy pipe and seamless pipe between the two existing relationship and differences between them, can not be confused. 
 Alloy pipe steel pipe in accordance with the production of materials used (that is, material) to define the name suggests is alloy tube; seamless pipe steel pipe in accordance with the production process (sew seamless) to define and distinguish it from the seamless tube seam tube, Longitudinal and spiral. 
 30CrMoA alloy tube chemical composition: 
 Carbon C: 0.26 ~ 0.34 
 Silicon Si: 0.17 ~ 0.37 
 Mn Mn: 0.40 ~ 0.70 
 Sulfur S: Allow the residual content of ≤ 0.025 
 Phosphorus P: Allow the residual content of ≤ 0.025 
 Chromium Cr: 0.80 ~ 1.10 
 Ni: to allow the residual content of ≤ 0.030 
 Cu: to allow the residual content of ≤ 0.025 
 Mo Mo: 0.15 to 0.25 
 Mechanical properties: 
 Tensile strength σb (MPa): ≥ 930 (95) 
 Yield strength σs (MPa): ≥ 735 (75) 
 Elongation δ5 (%): ≥ 12 
 Section shrinkage ψ (%): ≥ 50 
 Impact energy Akv (J): ≥ 71 
 Impact the toughness the value αkv (J/cm2): ≥ 88 (9) 
 Hardness: ≤ 229HB 
 Sample size: sample blank size is 15mm 
 Heat treatment and microstructure: 
 Standardized heat treatment: hardening 880 ° C, cold oil; tempering 540 ° C, water-cooled, oil cooled. 
 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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