Method for controlling widmannstatten structure in upgrade of C-Mn steel

A technology of Widmanderman's structure and control method, applied in the field of steel rolling, can solve the problems of TMCP steel plate performance and other problems, and achieve the effect of improving the Widmancer's structure without affecting the production rhythm, and improving the toughness and plasticity.
CN103572021BActive Publication Date: 2015-05-27NANJING IRON & STEEL CO LTD
9 Cites 2 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
NANJING IRON & STEEL CO LTD
Publication Date
2015-05-27

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention relates to a method for controlling widmannstatten structure in upgrade of C-Mn steel. The heating temperature is 1170-1180 DEG C, the soaking temperature is 1150-1160 DEG C, the tapping temperature is controlled at 1130-1140 DEG C, the finish rolling and initial rolling temperature is 810-930 DEG C, the finish rolling temperature is guaranteed to be 780-800 DEG C, accumulated reduction rate in finishing rolling is 50-70%, the cooling temperature is 760-780 DEG C, cooling speed is 10-15 DEG C / s, former 4 groups of collectors are used for forced cooling, the cooling intensity of the former 4 groups of collectors is 2000-3500m<3> / h, the last 6 groups of collectors are used for weak cooling, the cooling intensity of the last 6 groups of collectors is 1500-2500 m<3> / h, and the red temperature is 610 DEG C-640 DEG C. According to the method, the defect of widmannstatten structure in upgrade production of C-Mn steel is better overcome, widmannstatten structure is improved obviously, and the toughness and plasticity of the rolled steel plate are improved obviously.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention belongs to the field of steel rolling and relates to a method for controlling the structure of steel, in particular to a method for controlling the Widmanstatten structure of C-Mn upgraded steel. Background technique

[0002] In hypoeutectoid steel or hypereutectoid steel, when the high temperature is cooled at a faster rate, the proeutectoid ferrite or cementite crystallizes from the austenite grain boundary along a certain crystal plane of austenite. Ingrown and precipitated in the form of needles. Under the optical microscope, it can be observed that the ferrite or cementite grown from the austenite grain boundary is approximately parallel, feathery or triangular, and there is a pearlite structure in between, which is called Widmanstatten structure. Most of the Widmanstatten structures encountered in actual production are ferritic Widmanstatten structures, which often appear with coarse austenite grains. Therefore, the mechanical prop...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More