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Production method of 250 MPa-grade high-strength interstitial-free steel

A technology of interstitial atom-free steel and production method, which can be applied in the direction of furnace type, furnace, heat treatment furnace, etc., can solve the problem of high production cost, and achieve the effect of high strength and excellent stamping performance

Active Publication Date: 2020-12-29
SD STEEL RIZHAO CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] CN 101348884 discloses a composite micro-alloying of Nb, Cr and Ti to obtain a high-strength component system, adding expensive Cr alloy, and the production cost is high

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  • Production method of 250 MPa-grade high-strength interstitial-free steel
  • Production method of 250 MPa-grade high-strength interstitial-free steel

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Embodiment Construction

[0018] The following are specific examples of the present invention, further describing the technical solutions of the present invention, but the protection scope of the present invention is not limited to these examples. All changes or equivalent substitutions that do not depart from the concept of the present invention are included in the protection scope of the present invention.

[0019] A production method of 250MPa high-strength interstitial-free steel, using a low-carbon, low-silicon, high-phosphorus-manganese, Nb+Ti composite composition system, the chemical composition weight percentage is: C: ≤ 0.005%, Si: 0.08% ~ 0.12 %, Mn: 1.5% to 2.0%, P: 0.06% to 0.10%, S: ≤0.010%, Ti: 0.02% to 0.05%, Nb: 0.02% to 0.04%, B: 0.0005% to 0.0020%, Als: 0.02%~0.060%, N: ≤0.0040%, the rest is Fe and unavoidable impurities.

[0020] The production method of 250MPa grade high-strength interstitial-free steel, the specific steps are as follows:

[0021] 1) Slab heating process: the sla...

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Abstract

The invention relates to a production method of 250MPa-grade high-strength interstitial-free steel. A low-carbon, low-silicon, high-phosphorus manganese and Nb and Ti composite component system is adopted, through reasonable control over process temperature parameters, a front-section cooling and U-shaped coiling mode, high cold rolling reduction rate, stable pickling speed and stable control overannealing atmosphere, temperature and leakage point, the high-strength interstitial-free steel with yield strength larger than or equal to 250 Mpa, tensile strength larger than or equal to 440 Mpa, yield ratio smaller than or equal to 0.65, r value larger than or equal to 1.5, good deep drawing, good machining brittleness and good surface quality is obtained, and the high-strength interstitial-free steel is especially suitable for manufacturing of automobile stamping parts with certain stamping performance and high strength at the same time.

Description

technical field [0001] The invention belongs to the technical field of continuous annealing high-strength interstitial-atom-free steel for automobiles, and in particular relates to a production method of 250MPa high-strength interstitial-atom-free steel. Background technique [0002] With the advent of the era of the National Six Standards for automobile emissions, weight reduction and lightening of automobiles has become an inevitable road for the automobile industry. At the same time, high-strength interstitial atom-free steel plates with high strength and ultra-deep drawing performance have a large market space, among which High-strength interstitial-free cold-rolled steel strip with yield strength ≥ 250Mpa, tensile strength ≥ 440Mpa, and plastic strain ratio r ≥ 1.5 representing deep drawing performance has become an important research direction for enterprises to adapt to the market. [0003] High-strength interstitial-free steel is based on interstitial-free steel, and...

Claims

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Application Information

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IPC IPC(8): C21D1/26C21D6/00C21D8/02C21D9/52C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14
CPCC21D1/26C21D6/005C21D6/008C21D8/0221C22C38/02C22C38/04C22C38/002C22C38/004C22C38/14C22C38/12C22C38/06C22C38/001C21D9/52
Inventor 尹翠兰康华伟冯帆高兴昌梁亚王兴孙帅许铭
Owner SD STEEL RIZHAO CO LTD
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