Ferritomartensite hot-rolled dual phase steel with high surface quality and manufacturing method thereof

A hot-rolled dual-phase steel and manufacturing method technology, applied in the field of low-alloy steel manufacturing, can solve the problems of production difficulty, large performance fluctuation, and narrow ferrite formation process window, so as to improve thickness and adhesion performance, prevent The effect of crater pitting and wide process window
CN111363901AActive Publication Date: 2020-07-03BAOSHAN IRON & STEEL CO LTD
8 Cites 5 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
BAOSHAN IRON & STEEL CO LTD
Publication Date
2020-07-03

Smart Images

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

Abstract

The invention discloses ferritomartensite hot-rolled dual phase steel with high surface quality and a manufacturing method thereof. The steel comprises, by weight percent, 0.04 to 0.08% of C, not larger than 0.1% of Si, 1.0 to 1.4% of Mn, 0.3 to 0.8% of Al, 0.15 to 0.60% of Cr, 0.01 to 0.03% of Nb, not larger than 0.015% of P, not larger than 0.002% of S, and not larger than 0.005% of N, one or more of not larger than 0.03% of Ti, not larger than 0.03% of V, and not larger than 0.005% of Ca and the balance Fe and inevitable impurities. The conditions that the sum of Si+2Al+Cr is larger than orequal to 1.0 and Al / Cr is smaller than or equal to 2.5 need to be met at the same time, according to the hot-rolled dual phase steel, after acid pickling, the surface is bright and clean and free offigures, the tensile strength of the steel can be up to 600 MPa or above, the yield ratio is 0.7 or below, the hole expansion rate is 50% or above, the easy forming high hole expansion property is achieved, the steel can be used for producing parts like car wheel spokes, in addition, a production process is wide in window, industrial large production is easy, and performance is stable.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention belongs to the field of low-alloy steel manufacturing, and relates to a high-surface-quality ferritic-martensitic hot-rolled dual-phase steel and a manufacturing method, which are suitable for automotive appearance parts such as automobile wheels. Background technique

[0002] Based on the demand for emission reduction and consumption reduction, automobile weight reduction is a global trend. Many high-strength advanced high-strength steels have been developed to meet the demand for new steel materials with good processability such as automobiles. Among them, ferrite + martensitic dual-phase steel has the characteristics of low yield strength ratio, no yield platform, easy forming, high work hardening rate, high bake hardening, and long fatigue life, and has become the preferred choice for automotive parts such as wheel spokes. preferred material.

[0003] In order to obtain the desired microstructure of ferrite + martensitic dual-phase ...

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