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Production method of low-silicon phosphorized high-strength steel

A production method and high-strength steel technology, applied in furnaces, heat treatment equipment, manufacturing tools, etc., can solve the problems of affecting the corrosion resistance of steel plates, poor matching, and destroying phosphating film, etc., and achieve excellent stamping performance and welding performance. Phosphating performance, the effect of simple process

Pending Publication Date: 2021-08-03
TANGSHAN IRON & STEEL GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Alloying elements such as silicon and manganese are often added to high-strength steel to increase the strength of the steel, so as to achieve the purpose of lightweighting, but these silicon elements are easily enriched and oxidized during the annealing process of the steel plate, which has a negative effect on the surface properties of the steel plate, such as phosphating treatment. Performance will have a great impact, which in turn will affect the corrosion resistance of the steel plate
[0004] Masahiro Nomura of Japan introduced in the literature "The Effect of Surface Oxides on Phosphating Treatment Properties of High-strength Cold-rolled Steel Sheets" that the enrichment of silicon on the surface of steel sheets tends to form oxide films on the surface, which destroys the formation of phosphating films and leads to continuous There is a problem of poor compatibility with some existing phosphating agents in steel stripping

Method used

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  • Production method of low-silicon phosphorized high-strength steel
  • Production method of low-silicon phosphorized high-strength steel
  • Production method of low-silicon phosphorized high-strength steel

Examples

Experimental program
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Effect test

Embodiment 1

[0042] The nominal thickness of the low-silicon and phosphorus-added high-strength steel in this embodiment is 0.8 mm, and its production method is to use the chilled steel strip as a raw material and produce it through a continuous annealing process; the continuous annealing process includes preheating, heating 1, heating 2, homogenization Thermal annealing, slow cooling, rapid cooling, aging, final cooling, skin pass straightening and oiling processes, of which:

[0043] The chemical composition and weight percentage of the cold-rolled steel strip used are: C: 0.0018%; Si: 0.07%; Mn: 0.51%; P: 0.073%; S: 0.005%; Al: 0.044%; Ti: 0.027%; Nb : 0.019%, Cr: 0.023%; the balance is Fe and other unavoidable impurities.

[0044] Preheating temperature in continuous annealing process: 260°C; heating 1 temperature: 648°C; heating 2 temperature: 840°C, soaking annealing temperature: 830°C, slow cooling temperature: 686°C; rapid cooling temperature: 397°C; aging temperature : 364 ℃; fin...

Embodiment 2

[0048] The nominal thickness of the low-silicon and phosphorus-added high-strength steel in this embodiment is 1.0mm, and its production method is to use chilled steel strip as raw material and produce it through a continuous annealing process. The continuous annealing process includes preheating, heating 1, heating 2, homogenization Thermal annealing, slow cooling, rapid cooling, aging, final cooling, skin pass straightening and oiling processes, of which:

[0049] The chemical composition and weight percentage of the chilled steel strip used are C: 0.0015%; Si: 0.07%; Mn: 0.53%; P: 0.077%; S: 0.004%; Al: 0.041%; Ti: 0.027%; Nb: 0.018%, Cr: 0.021%; the balance is Fe and other unavoidable impurities.

[0050] Preheating temperature in continuous annealing process: 268°C; heating 1 temperature: 629°C; heating 2 temperature: 830°C, soaking annealing temperature: 840°C, slow cooling temperature: 698°C; rapid cooling temperature: 415°C; aging temperature : 390°C; final cooling te...

Embodiment 3

[0054] The nominal thickness of the low-silicon and phosphorus-added high-strength steel in this embodiment is 1.8 mm, and its production method is to use chilled steel strips as raw materials and produce them through a continuous annealing process. The continuous annealing process includes preheating, heating 1, heating 2, and uniform heating. Thermal annealing, slow cooling, rapid cooling, aging, final cooling, skin pass straightening and oiling processes, of which:

[0055] The chemical composition and weight percentage of the chilled steel strip used are: C: 0.0021%; Si: 0.08%; Mn: 0.55%; P: 0.073%; S: 0.007%; Al: 0.041%; Ti: 0.027%; Nb : 0.020%; Cr: 0.022%; the balance is Fe and other unavoidable impurities.

[0056] Preheating temperature in continuous annealing process: 267°C; heating 1 temperature: 636°C; heating 2 temperature: 838°C, soaking annealing temperature: 834°C, slow cooling temperature: 689°C; rapid cooling temperature: 398°C; aging temperature : 377°C; fin...

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Abstract

The invention discloses a production method of low-silicon phosphorized high-strength steel, and belongs to the field of automobile steel. The production method comprises the following steps that production is performed by taking a chilled steel strip as a raw material through a continuous annealing technology; the continuous annealing technology comprises the procedures of preheating, heating for the first time, heating for the second time, soaking annealing, slow cooling, rapid cooling, aging, final cooling, finishing withdrawal and straightening and oil coating. The method is simple in technological process and low in cost; the produced phosphorized high-strength steel is good in punch forming performance, welding performance and phosphorization coating performance, the yield strength Rp0.2 is 260 MPa-320 MPa, the tensile strength Rm is 380 MPa-440 MPa, and the requirement for the transverse percentage elongation A80 after fracture is larger than or equal to 28%.

Description

technical field [0001] The invention belongs to the field of steel for automobiles, and in particular relates to a production method of low-silicon and phosphorus-added high-strength steel. Background technique [0002] Phosphorus-added high-strength steel has been widely used in the automotive industry because of its good formability and weldability. C-Mn-Si are three alloying elements that are often used together in the iron and steel industry. In addition to the deoxidizing function, the Si alloying element also plays a role of solid solution strengthening. As a ferritizing element, it can greatly promote The formation of ferrite, thereby improving the ductility and toughness of steel. [0003] Alloying elements such as silicon and manganese are often added to high-strength steel to increase the strength of the steel, so as to achieve the purpose of lightweighting, but these silicon elements are easily enriched and oxidized during the annealing process of the steel plate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/26C21D9/52C22C38/02C22C38/04C22C38/06C22C38/28C22C38/26
CPCC21D1/26C21D9/52C22C38/004C22C38/002C22C38/02C22C38/04C22C38/06C22C38/28C22C38/26C21D2211/005
Inventor 孟凡月艾兵权周文王玉慧李涛李兴华夏明生齐建群李征
Owner TANGSHAN IRON & STEEL GROUP
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