Hot milled wire rod excelling in wire drawability and enabling avoiding heat treatment before wire drawing

Hot milled wire rod excelling in wire drawability and enabling avoiding heat treatment before wire drawing

  • CN 1,685,072 B
  • Filed: 09/24/2003
  • Issued: 07/20/2011
  • Est. Priority Date: 09/26/2002
  • Status: Active Grant
First Claim
Patent Images

1. one kind can be omitted the preceding good hot rolled steel rod of heat treated wire-drawing workability of wire drawing, it is characterized in that, is the above hot rolled steel rod of silk footpath 5.0mm, contains:

  • C;

    0.6%~

    1.0%, described content are quality %, down together,Si:

    0.1%



    1.5%



    Mn:

    0.3%



    1.0%



    P;

    be suppressed at below 0.02%,S;

    be suppressed at below 0.02%,Surplus is iron and unavoidable impurities,More than the 90 area % is pearlitic structure,The mechanical characteristics of the steel wire rod that 4m is long satisfies following (1)~

    (4) requirement,(1) TS *Mean value (the TS of-30≤

    tensile strength AV)≤

    TS *+ 30 Herein, TS *=400 * [C]+([Mn]+[Si])/5}+670, In the formula, TS *Mean value (TS with tensile strength AV) unit be MPa, [] expression is in the content of each element of per-cent, (2) standard deviation (TS of tensile strength σ

    )≤

    30MPa (3) mean value (RA of fracture necking down AV)>

    35% (4) standard deviation (RA of fracture necking down σ

    )≤

    4%, The method preparation of wherein said hot rolled steel rod by may further comprise the steps;

    From 900 ℃

    to 670 ℃

    temperature range with the average cooling rate of 8~

    20 ℃

    /sec cool off fast steel wire rod the first step andIn second step of slowly cooling off steel wire rod with the average cooling rate of 1~

    5 ℃

    /sec from 670 ℃

    to 500 ℃

    temperature range,And the loading density d/L of hot rolled steel rod is controlled at below 0.20, and wherein d represents the line footpath of wire rod, L representative ring spacing.

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