A kind of ocr17 continuous casting slab and production method thereof

A production method and continuous casting slab technology, applied in 0Cr17 continuous casting slab and its production field, can solve problems such as low content of refined grain elements, cold heading cracking, large temperature drop gradient, etc., to eliminate wire rod folding and reduce wire rod Cracks, the effect of reducing the temperature drop at the corner

CN107287531BActive Publication Date: 2019-01-01XINGTAI IRON & STEEL
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2019-01-01

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Abstract

The invention discloses an OCr17 continuous casting blank and a production method thereof. The continuous casting blank comprises the following chemical components in percentage by mass: 0.04-0.06% of C, 0.25-0.45% of Si, 0.40-0.55% of Mn, 0.035% or less of P, 0.030% or less of S, 16.50-16.75% of Cr, 0.60% or less of Ni, and the balance of Fe and inevitable impurities. The production method comprises the steps of: control of a continuous casting machine crystallizer water flow, a secondary cold water flow and crystallizer electromagnetic stirring parameters, slow cooling of the continuous casting blank and casting blank angle finishing chamfering plane width control. The method enables the surface pass percent of the continuous casting blank of rolled steel to reach above 99%, and guarantees elimination of surface and subsurface cracks of the continuous casting blank; and through angle finishing, the angle rolling broadening deformation is reduced, the angle temperature drop is reduced, the OCr17 wire folding and cracks are eliminated, the wire rod primary inspection pass percent is above 99%, and the acid washing secondary inspection pass percent is above 95%.
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Description

technical field

[0001] The invention belongs to the technical field of metallurgy, and in particular relates to an 0Cr17 continuous casting slab and a production method thereof. Background technique

[0002] 0Cr17 is widely used in household appliances, automobiles and other industries due to its good corrosion resistance and bright surface of processed parts.

[0003] At present, there are many enterprises producing 0Cr17 stainless steel wire rods in China, and the casting slabs for wire rod rolling are continuous casting slabs. Due to the poor heat transfer performance of this steel grade, the temperature drop gradient during the solidification process is large, and the content of refined grain elements is low, which leads to its small size. The equiaxed crystal layer is thin and the columnar crystals are developed, so it is easy to generate cracks on the surface and subcutaneous of the slab and inherit it to the rolling process, causing cracks in the wire rod. During the ...

Examples

Embodiment 1

[0032] The chemical composition and mass percentage of the 0Cr17 continuous casting slab in this example are: C: 0.043%, Mn: 0.50%, Si: 0.36%, P: 0.018%, S: 0.002%, Cr: 16.71%, Ni: 0.07%, the rest is iron and unavoidable impurity elements.

[0033] The production method of 0Cr17 continuous casting slab in this embodiment includes continuous casting machine crystallizer water flow rate, secondary cooling water flow rate, crystallizer electromagnetic stirring parameter control, continuous casting slab slow cooling, casting slab corner grinding and chamfering plane width control, specific process steps As described below:

[0034] (1) Crystallizer water flow: 1480L / min;

[0035] (2) Secondary cooling water flow rate (L / min): Zone 1: 45.8L / min; Zone 2: 36.8L / min; Zone 3: 20L / min; casting speed 1.1m / min;

[0036] (3) Crystallizer electromagnetic stirring parameters: current 370A, frequency: 4Hz;

[0037] (4) Pit temperature of continuous casting slab: 265°C;

[0038] (5) Grindi...

Embodiment 2

[0041] The chemical composition and mass percentage of the 0Cr17 continuous casting slab in this example are: C: 0.044%, Mn: 0.50%, Si: 0.36%, P: 0.016%, S: 0.002%, Cr: 16.71%, Ni: 0.07%, the rest is iron and unavoidable impurity elements. .

[0042] (1) Crystallizer water flow: 1547L / min;

[0043] (2) Secondary cooling water flow rate (L / min): Zone 1: 46.1L / min; Zone 2: 37.1L / min; Zone 3: 19.8L / min; casting speed 1.1m / min;

[0044] (3) Crystallizer electromagnetic stirring parameters: current 370A, frequency: 4Hz;

[0045] (4) Pit temperature of continuous casting slab: 283°C;

[0046] (5) Grinding and chamfering plane width of slab corner is 15mm.

[0047]According to the process of this embodiment, the qualified rate of rolling steel continuous casting slab is 100%, and the rolled 0Cr17 wire rod of Φ5.5mm specification has a qualified rate of 99.2%; after pickling, the surface quality is good, without folding and visually visible cracks, The passing rate of the second ...

Embodiment 3

[0049] The chemical composition and mass percentage of the 0Cr17 continuous casting slab in this example are: C: 0.049%, Mn: 0.53%, Si: 0.39%, P: 0.017%, S: 0.002%, Cr: 16.68%, Ni: 0.07%, the rest is iron and unavoidable impurity elements.

[0050] (1) Crystallizer water flow: 1500L / min;

[0051] (2) Secondary cooling water flow rate (L / min): Zone 1: 46L / min; Zone 2: 37L / min; Zone 3: 20.1L / min; casting speed 1.1m / min;

[0052] (3) Crystallizer electromagnetic stirring parameters: current 370A, frequency: 4Hz;

[0053] (4) Pit temperature of continuous casting slab: 300°C;

[0054] (5) Grinding and chamfering plane width of slab corner is 19mm.

[0055] According to the process of this embodiment, the qualified rate of rolling steel continuous casting billet is 99.3%, and the rolled Φ6.5mm 0Cr17 wire rod has a qualified rate of 99.1%; the surface quality after pickling is good, without folding and visually visible cracks, The passing rate of the second inspection after pick...