Production method of steel wire rod used for high-strength prestressed concrete steel bars

Abstract

The invention provides a production method of wire rods for high-strength prestressed concrete steel rods. The production method includes: step 1, converter smelting, the carbon content of molten steel at the end of the converter is 0.06-0.15 wt%, the phosphorus content is 0.011-0.020 wt%, and the tapping temperature is 1630-1650°C; step 2, ladle furnace refining, refining is The bit temperature is 1504-1581°C, the refining off-position temperature is 1557-1605°C; Step 3, billet continuous casting, the superheat is set to 20-32°C, and the casting speed is set to 2-2.2m / min; Step 4, For high wire rolling, the billet heating time is more than 2 hours; the temperature setting of the heating section is: the temperature of the upper heating section is 1050-1200°C, the temperature of the lower heating section is 980-1180°C, and the heating section time is not less than 1 hour; the temperature of the upper soaking section is 1000 ~1200°C, soaking lower section temperature is 980~1180°C, soaking section time is not less than 1 hour; rolling start temperature is 960~1000°C; wire rod spinning temperature is 900~950°C. The wire rod for the high-strength prestressed concrete steel bar prepared by the method provided by the invention has stable and uniform quality and no crack defect.

Description

technical field [0001] The invention relates to the field of metal materials, in particular to a production method for wire rods for high-strength prestressed concrete steel bars. Background technique [0002] The traditional 30MnSi is affected by its low strength and easy hysteresis fracture, which is gradually replaced by high-strength 30Si 2 Instead of Mn, this steel type is a medium-low carbon alloy steel with high strength, toughness and impact resistance. Its hot-rolled wire rod is mainly used in the manufacture of port concrete pipe piles and high-rise buildings after drawing strengthening and modulation heat treatment. Foundation concrete pipe piles, etc. [0003] Since 30Si 2 Mn belongs to high-silicon steel. Silicon has poor thermal conductivity and does not conduct heat well in steel. Therefore, rapid heating or rapid cooling can easily cause cracks in the billet, especially in severe winter seasons, and cracks are more likely to occur. Therefore, the production...

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Problems solved by technology

[0003] Since 30Si 2 Mn belongs to high silicon steel, the thermal conductivity of silicon is poor, and the heat transfer in the steel is not good, so rapid heating or rapid cooling is easy to cause cracks in the billet, especially in the severe winter season, cracks are more likely to occur, so the production of this product is difficult.

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