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Galvanizing bake hardening steel plate with timeliness being larger than 6 months and production method of galvanizing bake hardening steel plate

A baking hardening and production method technology, applied in the field of metallurgy, can solve problems such as insufficient aging resistance, achieve the effects of solving insufficient aging resistance, improving aging resistance, and reducing precipitation tendency

Inactive Publication Date: 2019-11-26
TANGSHAN IRON & STEEL GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

By optimizing the composition design, optimizing the slab hot charging and hot rolling process, adjusting the cold rolling reduction rate and controlling the annealing and skin pass process, the invention solves the problem of insufficient aging resistance of traditional bake hardening steel and improves the performance of bake hardening steel. Excellent aging resistance, thus providing a guarantee for the long-term storage and use of bake-hardened steel

Method used

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  • Galvanizing bake hardening steel plate with timeliness being larger than 6 months and production method of galvanizing bake hardening steel plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] In this embodiment, the specification of the galvanized bake-hardened steel plate with a timeliness of more than 6 months is 0.6mm*1200mm, and its chemical composition and mass percentage are shown in Table 1.

[0020] The production method of the galvanized bake-hardened steel plate with a timeliness of more than 6 months in this embodiment includes molten iron pretreatment, decarburization converter, RH vacuum treatment, continuous casting, slab hot charging, hot rolling, acid continuous rolling, continuous hot dipping Zinc, post-plating finishing process, the specific process steps are as follows:

[0021] (1) Decarburization converter process: After the molten iron is pretreated, it is decarburized to 0.035% by decarburization converter;

[0022] (2) RH vacuum treatment process: RH outbound B content is controlled at 0.0008%;

[0023] (3) Continuous casting process: the continuous casting process protects the casting, and controls N at 0.0030%;

[0024] (4) Slab h...

Embodiment 2

[0031] In this embodiment, the specification of the galvanized bake-hardening steel plate with a timeliness of more than 6 months is 1.0 mm*1325 mm in thickness, and its chemical composition and mass percentage are shown in Table 1.

[0032] The production method of the galvanized bake-hardened steel plate with a timeliness of more than 6 months in this embodiment includes molten iron pretreatment, decarburization converter, RH vacuum treatment, continuous casting, slab hot charging, hot rolling, acid continuous rolling, continuous hot dipping Zinc, post-plating finishing process, the specific process steps are as follows:

[0033] (1) Decarburization converter process: After the molten iron is pretreated, it is decarburized to 0.040% by decarburization converter;

[0034] (2) RH vacuum treatment process: RH outbound B content is controlled at 0.0010%;

[0035] (3) Continuous casting process: the whole process of continuous casting is protected and casted, and N is controlled...

Embodiment 3

[0043] In this embodiment, the specification of the galvanized bake-hardening steel plate with a timeliness of more than 6 months is 0.8mm*1300mm, and its chemical composition and mass percentage are shown in Table 1.

[0044] The production method of the galvanized bake-hardened steel plate with a timeliness of more than 6 months in this embodiment includes molten iron pretreatment, decarburization converter, RH vacuum treatment, continuous casting, slab hot charging, hot rolling, acid continuous rolling, continuous hot dipping Zinc, post-plating finishing process, the specific process steps are as follows:

[0045] (1) Decarburization converter process: After the molten iron is pretreated, it is decarburized to 0.045% by decarburization converter;

[0046] (2) RH vacuum treatment process: RH outbound B content is controlled at 0.0012%;

[0047] (3) Continuous casting process: the whole process of continuous casting is protected and casted, and N is controlled at 0.0032%;

...

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Abstract

The invention discloses a galvanizing bake hardening steel plate with the timeliness being larger than 6 months and a production method of the galvanizing bake hardening steel plate. The steel plate includes, by mass, 0.0018%-0.0036% of C, 0.10%-0.30% of Mn, smaller than or equal to 0.012% of S, 0.015%-0.030% of P, smaller than or equal to 0.08% of Si, 0.020%-0.060% of Als, smaller than or equal to 0.0035% of N, 0.0040%-0.0150% of Nb, 0.0020%-0.0060% of Ti, smaller than or equal to 0.0015% of B and the balance Fe and inevitable impurities. The production method includes a molten iron pretreatment process, a decarburization converter process, a RH vacuum treatment process, a continuous casting process, a slab hot charging process, a hot rolling process, an acid continuous rolling process, acontinuous hot galvanizing process and an after-plating finishing process. The problem that traditional bake hardening steel is insufficient in timeliness resistance, and the timeliness resistance ofthe bake hardening steel is improved to 6 month or longer.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a galvanized bake-hardened steel plate with a timeliness of more than six months and a production method thereof. Background technique [0002] After long-term storage of bake-hardened steel, the C and N atoms solid-dissolved in the ferrite matrix, mainly N atoms, will be precipitated from the ferrite lattice, resulting in a natural aging phenomenon. After the natural aging phenomenon of bake-hardening steel, the tensile strength and yield strength will change significantly. In addition, due to the precipitation of C and N atoms along dislocations, the formation of "Corotov air clusters" results in local differences in yield. In the subsequent stamping and forming process of the steel strip, the local uneven deformation of the material will form a Lüders strip, which is wrinkled macroscopically, thus affecting the surface quality of the stamping part. [0003] Co...

Claims

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Application Information

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IPC IPC(8): C22C38/14C22C38/12C22C38/06C22C38/04C21D8/02C23C2/06C23C2/40
CPCC21D8/0205C21D8/0226C21D8/0236C21D8/0247C22C38/002C22C38/004C22C38/04C22C38/06C22C38/12C22C38/14C23C2/06C23C2/40
Inventor 李永亮邝霜杨玉厚齐秀美汪云辉陈彤贾丽慧孙扩张宇
Owner TANGSHAN IRON & STEEL GROUP
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