Title: Process for manufacturing low yield strength ultrafine grain belt steel
Application Number: 200610021938 Application Date: 2006.09.25
Publication Number: 1928130 Publication Date: 2007.03.14
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: C21D8/02;C21D11/00;B21B37/74;C22C38/06
Applicant(s) Name: Panzhihua New Steel Address:
Inventor(s) Name:
Attorney & Agent: rengong
Abstract:
    The present invention discloses making process of low yield/tensile ratio superfine grain band steel, and the making process can lower the yield/tensile ratio of the band steel effectively while ensuring fined grain. The making process includes the following steps: heating the carbon manganese steel billet to 1150-1200 deg.c; rolling in the initial rough rolling temperature of 1050-1150 deg.c, final rough rolling temperature of 1000-1050 deg.c, initial precision rolling temperature of 950-1000 deg.c, and final precision rolling temperature of 830-870 deg.c; fast cooling the rolled band steel to 710-735 deg.c at the cooling speed of 20-40 deg.c/s, slowly cooling for 3-5 sec, and fast cooling to 650-670 deg.c; and winding. The low yield/tensile ratio superfine grain band steel has yield strength of 295-415 Mpa, tensile strength of 460-510 Mpa, elongation of 26-40 wt%, yield/tensile ratio Rel/Rm not greater than 0.80.
Time: 15
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