Steel for saw blade substrate and manufacturing method thereof

A manufacturing method and substrate technology, applied in manufacturing tools, temperature control, furnace types, etc., can solve the problems of insufficient hardenability, abnormal microstructure, and difficult to accurately control boron content, and achieve the effect of uniform hardness distribution in the cross-section.

Active Publication Date: 2013-02-06
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high content of carbon and manganese in this patent, carbon and manganese are alloy elements that are easy to segregate, and the boron content is difficult to accurately control during smelting, etc., resulting in segregation and microstructure in the core of industrially produced steel plates. abnormal
[0014] The above-mentioned steel for saw blade base is not suitable for saw blades with larger diameters due to insufficient hardenability, hardenability or high cost, or insufficient comprehensive performance.

Method used

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  • Steel for saw blade substrate and manufacturing method thereof
  • Steel for saw blade substrate and manufacturing method thereof
  • Steel for saw blade substrate and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] According to the composition of Example 1 shown in Table 1, it was smelted in a laboratory and cast into a 50kg steel ingot. The steel ingot is forged into a 65×120mm sample, and then a rolling test is carried out on a small rolling mill to form a test steel plate with a thickness of 9mm and a width of 150mm. The slab heating temperature is 1190°C, and the heating and holding time is 120 minutes. The laboratory rolling process is carried out in two steps:

[0056] One is that the final rolling temperature is 900°C, and the hot-rolled steel plate is obtained by natural cooling after rolling;

[0057] The second is that the final rolling temperature is 945°C, the coiling temperature is 750°C, and the hot-rolled steel coil is obtained by slow cooling after coiling.

[0058]The tensile strength of the hot-rolled steel plate for the saw blade substrate produced according to the above-mentioned technological scheme meets Rm: 850-1200MPa, and the elongation is 6-13%; the ten...

Embodiment 2

[0060] According to the composition of Example 2 shown in Table 1, it was smelted in a laboratory and cast into a 50kg steel ingot. The steel ingot is forged into a 65×120mm sample, and then a rolling test is carried out on a small rolling mill to form a test steel plate with a thickness of 9mm and a width of 150mm. The slab heating temperature is 1150°C, and the heating and holding time is 125 minutes. The laboratory rolling process is carried out in two steps:

[0061] One is that the final rolling temperature is 925°C, and the hot-rolled steel plate is obtained by natural cooling after rolling;

[0062] The second is that the final rolling temperature is 900°C, the coiling temperature is 730°C, and the hot-rolled steel coil is obtained by slow cooling after coiling.

[0063] The tensile strength of the hot-rolled steel plate for the saw blade substrate produced according to the above-mentioned technological scheme meets Rm: 850-1200MPa, and the elongation A: 6-13%; the te...

Embodiment 3

[0065] According to the composition of Example 3 shown in Table 1, it was smelted in a laboratory and cast into a 50kg steel ingot. The steel ingot is forged into a 65×120mm sample, and then a rolling test is carried out on a small rolling mill to form a test steel plate with a thickness of 9mm and a width of 150mm. The slab heating temperature is 1250°C and the heating time is 120min. The laboratory rolling process is carried out in two steps:

[0066] One is that the final rolling temperature is 928°C, and the hot-rolled steel plate is obtained by natural cooling after rolling;

[0067] The second is that the final rolling temperature is 931°C, the coiling temperature is 800°C, and the hot-rolled steel coil is obtained by slow cooling after coiling.

[0068] The tensile strength of the hot-rolled steel plate for the saw blade substrate produced according to the above-mentioned technological scheme meets Rm: 850-1200MPa, and the elongation A: 6-13%; the tensile strength of ...

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Abstract

The invention discloses steel for a saw blade substrate, comprising the chemical components in percentage by weight: 0.68-0.80% of C, 0.30-0.70% of Cr, 0.50-1.00% of Mn, 0.10-0.50% of Si, 0.03-0.15% of V, 0-0.0050% of Ca, 0.0050-0.010% of N, 0.005-0.04% of Alt, P less than or equal to 0.02%, S less than or equal to 0.01% and the balance of Fe and unavoidable impurities. The manufacturing method of the steel comprises the steps of: carrying out continuous casting or die casting on the smelted liquid steel and carrying out blooming after the die casting to obtain steel billet; carrying out slow cooling on the continuously cast billet or the bloomed steel billet after die casting; heating the continuously cast billet or the bloomed steel billet in a temperature range of 1100-1250DEG C, wherein the outlet temperature of a rough mill is greater than or equal to 1050DEG C, the final rolling temperature is 870-950DEG C and the rolled steel plate adopts natural cooling; or carrying out hot rolling to obtain strip steel, wherein the final rolling temperature is 870-950DEG C and coiling temperature is 720-820DEG C; and controlling within 0.1-5DEG C / s for cooling after the coiling. After the steel is made into a saw blade and undergoes quenching and annealing, the section rigidity of whole saw blade body can be above HRC43, is distributed evenly and can satisfy the usability requirements of the saw blades with larger diameters.

Description

technical field [0001] The invention relates to a steel for a saw blade base body, in particular to a steel for a large saw blade base body and a manufacturing method thereof. Background technique [0002] Saw blade refers to the combination of steel substrate and diamond or hard alloy sintered or welded. The saw blade rotates at high speed to cut metal, stone, wood, cement, etc. Usually, the linear speed for cutting granite is 25-40m / s, and the cutting marble is 45-60m / s. The steel substrate with a certain vibration frequency, the vibration frequency increases during the cutting process, and when the additional frequency is consistent with the natural frequency, resonance occurs, which requires the steel substrate to have a high elastic limit and a high yield ratio; secondly , Due to the unevenness of the steel matrix, lateral pressure is generated during cutting to make the steel matrix repeatedly bend, resulting in a decrease in the rigidity of the matrix, or fatigue dam...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/24B21B37/74C21D9/24C21D1/18
Inventor 华蔚徐正其杨才定车日新
Owner BAOSHAN IRON & STEEL CO LTD
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