Grinding method for double-phase heat-resistant stainless steel continuous casting sheet billet

A technology of heat-resistant stainless steel and continuous casting, which is used in the field of slab repair and grinding in duplex and heat-resistant stainless steel continuous casting, can solve the problems of easy to produce wear marks, affect the surface quality of medium plate rolling, surface roughness, etc. The effect of surface quality

Inactive Publication Date: 2013-07-17
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Duplex and heat-resistant stainless steel is the applicant's key steel species. With the continuous development of the market, production and sales have increased year by year, especially in recent years. Phase and heat-resistant steel slabs are all ground and circulated to the next process for rolling. The surface wear marks caused by grinding can only be eliminated after repeated shot blasting, whitening, and grinding, which seriously affects the production capacity of the hot rolling process. , resulting in unplanned products due to ultra-deep grinding, which not only affects the contract fulfillment rate, but also causes economic losses due to price cuts
The roughness of the ground surface quality of the slab in dual-phase and heat-resistant stainless steel continuous casting is a key indicator of the surface quality of the slab after rolling. The surface is rough, seriously affecting the surface quality of the plate after rolling

Method used

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  • Grinding method for double-phase heat-resistant stainless steel continuous casting sheet billet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The continuous casting slab of dual-phase steel S31803 ground in this embodiment has a length of 2000 millimeters, a width of 1238 millimeters and a thickness of 160 millimeters.

[0032] 1. The first step is grinding with a 16# grinding wheel

[0033] 1. Equipment used: billet surface grinding machine.

[0034] 2. Grinding wheel angle: 45°;

[0035] 3. Speed ​​of trolley: 50m / min;

[0036] 4. Feed rate: 30mm;

[0037] 5. Proportional value of grinding head depression: aggravated grinding 173

[0038] 6. Grinding rate of two surfaces: ≥2.5%, {repairing rate = (weight of billet before grinding - weight after grinding) ÷ weight before grinding}, each side is regrinded 3 times

[0039] 7. Surface roughness R on both sides of the slab after grinding Z 108 μm.

[0040] 2. In the second step, use a grinding wheel with a particle size of 20# to grind

[0041] 1. Equipment used: billet surface grinding machine.

[0042] 2. Grinding wheel angle: 45°;

[0043] 3. Speed ​...

Embodiment 2

[0049] The continuous casting slab of the heat-resistant steel grade S30815 that this embodiment grinds, the length of casting slab is 2000 millimeters, wide 1238 millimeters, thick 160 millimeters.

[0050] 1. The first step is grinding with a 16# grinding wheel

[0051] 1. Equipment used: billet surface grinding machine.

[0052] 2. Grinding wheel angle: 45°;

[0053] 3. Speed ​​of trolley: 50m / min;

[0054] 4. Feed rate: 30mm;

[0055] 5. Proportional value of grinding head depression: heavy grinding 167

[0056] 6. Grinding rate of both surfaces: ≥3.5%, {repairing rate=(weight of billet before grinding-weight after grinding)÷weight before grinding}, each side is re-grinded 4 times

[0057] 7. Surface roughness R on both sides of the slab after grinding Z 103 μm.

[0058] 2. In the second step, use a grinding wheel with a particle size of 20# to grind

[0059] 1. Equipment used: billet surface grinding machine.

[0060] 2. Grinding wheel angle: 45°;

[0061] 3. Spe...

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Abstract

The invention relates to a grinding method for double-phase heat-resistant stainless steel continuous casting sheet billet. The grinding method includes: firstly grinding with a 16# grinding wheel and secondly grinding with a 20# grinding wheel; parameters adopted by the first step are arranged as follow: I equipment is casting surface grinding machine, II grinding wheel angle is 45 degrees + / - 5 degrees, III lathe speed is 50 + / - 3 m / min, IV feed rate is 30 mm + / - 5 mm, V grinding head pressure ratio is enhanced 160-180, VI one grinding mode is when grinding rate of two surfaces > / = 2.5% and < / = 3.0%, each surface is grinded enhancedly for 3 times, when grinding rate of two surfaces > / = 3.5%, each surface is grinded enhancedly for 4 times, VII roughness after grinding RZ < / = 120 mum; and parameters adopted by the second step are arranged as follow: I equipment is casting surface grinding machine, II grinding wheel angle is 45 degrees + / - 5 degrees, III lathe speed is 50 + / - 3 m / min, IV feed rate is 25 mm + / - 5 mm, V grinding head pressure ratio is enhanced 60-70, VI grinding slightly for 2 times based on the first step, VII roughness after grinding RZ < / = 60 mum. The surface toughness is low with the grinding method.

Description

technical field [0001] The invention relates to a method for grinding slabs in continuous casting of dual-phase and heat-resistant stainless steel. Background technique [0002] Grinding of stainless steel continuous casting slab is to use the grinding machine to drive the grinding wheel to run to remove the protective slag and surface defects on the surface of the continuous casting slab, which is a necessary means to ensure that the continuous casting slab is rolled into a qualified stainless steel plate. [0003] Duplex and heat-resistant stainless steel is the applicant's key steel species. With the continuous development of the market, production and sales have increased year by year, especially in recent years. Phase and heat-resistant steel slabs are all ground and circulated to the next process for rolling. The surface wear marks caused by grinding can only be eliminated after repeated shot blasting, whitening, and grinding, which seriously affects the production cap...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B24B1/00B22D11/12
Inventor 王建新郑新国赵晓明吴敏
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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