4118/18crmo4/ 20CrMo/ DIN1.7218 structure steel

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Posting date : Jun 03, 2014

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4118/18crmo4/ 20CrMo/ DIN1.7218 structure steel 20 crmo - introduction Brand: 20 crmo Standard: GB/T 3077-1988 Corresponding standard, JIS G4053:2003 ASTM A29M: 2005 Also thou ISO 683-683 Unified digital code: A30202 20 crmo - performance is introduced Second-ranking characteristics and scope of application: High hardenability, no temper brittleness, weldability is quite good, the formation of cold cracking tendency is very small, good machinability and cold strain and plastic. Generally in the quenched and tempered or carburizing and quenching condition, used in the manufacture of the corrosive medium and working temperature below 250 °C, containing hydrogen nitrogen mixture medium work in high pressure pipe and all kinds of fasteners, more senior carburized parts, such as gear, shaft, etc. Low chemical composition: Carbon C: 0.17 ~ 0.24 Si Si: 0.17 ~ 0.37 Manganese Mn: 0.40 ~ 0.70 S: sulfur residual content of 0.035 or less are allowed P P: residual content of 0.035 or less are allowed Chromium (Cr: 0.80 ~ 1.10 Ni Ni: residual content of 0.030 or less are allowed Copper Cu: residual content of 0.030 or less are allowed Mo Mo: 0.15 ~ 0.25 Low mechanical properties: Tensile strength of sigma (MPa) : b 885 or higher (90) Yield strength sigma (MPa) : s 685 or (70) Elongation is the delta (%) : 12 or higher Reduction of bits (%) : 50 or more Impact energy Akv (J) : p. 78 Impact toughness value of alpha kv (J/cm2) : 98 (10) or higher Hardness: hb 197 or less Sample size: blank sample size is 15 mm 20 crmo - use Gear, fasteners, flanges, nuts, etc The higher hardenability, non-temper brittleness, very good weldability, forming a small tendency to cold cracking can be cutting and cold response of a good pyroplastic. Usually quenched and tempered or case hardening state used for the manufacture of non-corrosive media and working temperature below 250 , the medium containing a mixture of nitrogen and hydrogen in the work of the high-pressure pipe and various fasteners, higher carburizing parts, such as gears, shafts and so on.