Method for solving cracks of head and tail blanks of 10Cr17 steel grade

A technology of head and tail, steel grade, applied in the field of solving 10Cr17 steel grade head and tail billet cracks, can solve problems such as reducing the yield of head and tail billets, affecting the use of head and tail billets, etc. Quality, the effect of eliminating the phenomenon of surface peeling

Pending Publication Date: 2021-10-22

SHANDONG TAISHAN STEEL GROUP

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AI-Extracted Technical Summary

Problems solved by technology

These all reduce the yield of the head and tail bl...

Method used

Based on this, the object of the present invention is to provide a kind of method that solves 10Cr17 steel grade head and tail blank crack. The present invention finds through experiments that when the temperature of the 10Cr17 steel grade is maintained at 200-400 DEG C, grinding helps to improve product quality. Further research found that different pressures are generated by setting different currents during the grinding process, and the heat generated by grinding under different pressures is also different. Since the thermal conductivity ...

Abstract

The invention discloses a method for solving cracks of head and tail blanks of a 10Cr17 steel grade. The method for solving cracks of the head and tail blanks of the 10Cr17 steel grade comprises the following steps of: keeping the temperature of the head and tail blanks of the 10Cr17 steel grade at 200-400 DEG C, and sequentially carrying out rough grinding and accurate grinding on the surfaces of the head and tail blanks by using a grinding machine; and when the temperature of the head and tail blanks is lower than 150 DEG C, stopping grinding. And during rough grinding, the current of the grinding machine is 250-350A. And during accurate grinding, the current of the grinding machine is 120-200A. According to the method for solving cracks of the head and tail blanks of the 10Cr17 steel grade, the problem that cracks are locally generated on the surfaces of the 10Cr17 head and tail blanks is solved, the surface peeling phenomenon of subsequent hot rolled steel coils is completely eradicated, the pickling first-grade product rate is remarkably increased, and therefore, the product quality is improved, and economic benefits are greatly improved. According to the method for solving cracks of the head and tail blanks of the 10Cr17 steel grade, the grinding frequency and the grinding rate can be reduced, cracks of the head and tail blanks are avoided, and the product cost is reduced.

Technology Topic

GrindingCrazing +7

Image

Examples

Experimental program(2)

Example Embodiment

[0023] Example 1

[0024] Step 1: Determination process: Iron water P: 0.075 ~ 0.150%, using lime powder, dephosphorizing agent to dephosphorize, dephosphorized slag, after pretreatment, semi-steel P <0.020%;

[0025] Step 2: TSR furnace smelting process: high carbon chrome is added 20 ~ 30%, deprorophoste steel P <0.020%, deprorosphere water temperature 1300 ~ 1450 ° C, blown finish temperature control at 1700 ~ 1740 ° C, C : 0.01 ~ 0.08%, reduction time> 6 minutes, reduction CR: 16.0 ~ 17.5%, silicon added amount is 1 to 1.5% reduction, control reduction after the reduction of slag color is white slag, using secondary desulfurization process, strictly control Steel sulfur content, sulfur content of steel is ≤0.006%;

[0026] Step 3: LF refining process: After the steel water reaches LF, the steel bag of the steel bag has a thickness of 150 ~ 300mm. The input temperature is 1500 ~ 1620 ° C, the refining time is 45 ~ 40min, the power transmission time is 15 ~ 40min, plus grafted, fluoride adjustment refinement Alkalin R> 2.0, soft blowing time, calm time ≥ 15 minutes, outbound temperature 1560 ~ 1585 ° C;

[0027] Step 4: Continuous casting process: The continuous casting process is made of full protection, the overheating control is controlled by 20 ± 5 ° C, the puller is 1.0 ~ 1.1m / min, the thickness of the casting blank is 200mm, the width is 1000 to 1600 mm, the crystallizer wide side water quantity: 2600 ~ 4000L / min, narrow edge water: 400 ~ 600L / min, electromagnetic stirring parameters: current 200 ~ 300A, frequency: 4.0 ~ 6.0 Hz; red blank offline temperature ≥ 600 ° C;

[0028] Step 5: During the treatment of the 10Cr17 steel head blade temperature is 200 ~ 400 ° C, first use the grinding machine to coarse grinding the surface of the head blade, use 16 mesh grinding wheels, the current is 300A, repair During the grinding, wear the feed amount 30mm; after the coarse grinding is completed, fine grinding, use the grinding wheel of the replacement of the grinder, use 30 mesh grinding wheels, the grinding machine is transferred to 170A, ground it, the surface of the head blade is rough The degree is 0.46mm, and the grinding is completed.

[0029] When the temperature of the head bille is below 150 ° C, it stops developing, and the head-tailed billet is warmed to 300 ~ 400 ° C, and then the removal of continuing.

Example

[0030] Example 2 to 3 and Comparative Example 1 to 8

[0031] Examples 2 to 3 and the wearing method of the Comparative Examples 1 to 8 is the same as in Example 1, and the difference is that the number of trimmed temperatures, grinding machines and wear are considered.

[0032] Table 1

[0033]

[0034]

[0035] During the grinding process of Examples 1 to 3 and Comparative Example 1 to 8, the statistical grinding is carried out to complete the wear ratio of the head billet; and the coated headwind is hot rolled and pickled, calculate the first level. The resulting results are shown in Table 2.

[0036] Table 2

[0037] project Write rate% One-level product rate% Example 1 2.6 100 Example 2 2.8 100 Example 3 2.7 100 Contrast 1 4.3 73 Contrast 2 4.8 66 Contrast 3 4.3 96 Contrast 4 4.2 94 Contrast 5 4.2 90 Contrast 6 4.0 94 Contrast 7 4.2 90 Contrast 8 4.2 93

[0038] As can be seen from Table 2, the headwear grinding of Examples 1 to 3, which is lowered, and the cost of the billet can be reduced. The first-level product is also 100%. The headwear of the contrast of 1 to 8 is higher than that of Examples 1 to 3, and the primary rate is less than in Examples 1 to 3.

[0039] In conjunction with Table 1, the method of the present invention can reduce the number of wear, reduce the grinding ratio, and avoid cracks in the headworm, which greatly reduces the cost of the product.

PUM

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