Ultrafine crystal grain semi-trailer axle tube material and processing method of axle tube
A semi-trailer axle and ultra-fine grain technology, which is applied in metal processing equipment, manufacturing tools, rolling mill control devices, etc., can solve the problems of insufficient fatigue resistance performance, difficulty in ensuring the quality of welds, and low strength of steel pipes, etc. , to achieve the effects of excellent comprehensive mechanical properties, excellent organizational structure, and mature production technology
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[0023] (1) The weight percentages of the chemical components of the ultra-fine grain semi-trailer axle tube are: C: 0.23-0.28%, Si: 0.15-0.30%, Mn: 1.30-1.45%, P: ≤0.03%, S: ≤0.035%, Al: ≤0.01%, Cu: ≤0.25%, Ni: ≤0.25%, Cr: ≤0.25%, Mo: ≤0.15%, and the rest are iron and impurities; among the impurities are Pb, Sn, As, Sb and The total content of Bi elements≤450PPM, among which, each single element≤100PPM, Pb≤80PPM; the content of H in the impurities is less than 2PPm, the content of O is less than 40PPm, and the content of N is less than 80PPm; the carbon equivalent of the axle tube=C+Mn / 6+(Cr +Mo+V) / 5+(Ni+Cu) / 15×100%, its value is greater than 0.5%.
[0024] (2) The processing method of ultra-fine grain semi-trailer axle tube:
[0025] EAF electric furnace melting and primary smelting: low S and P scrap steel is selected as the furnace material, the axle tube is processed and trimmed and high-quality pig iron is used.
[0026] Alloys need to prepare low-carbon chromium, low-c...
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