Production method of high-strength saw bit steel coil

A production method and high-strength technology, applied in the direction of temperature control, heat treatment equipment, heat treatment process control, etc., can solve the problems of broken billet, excessive cooling rate of casting billet, difficult processing, etc., to improve plate shape control and mechanical properties. , highlight the effect of technological progress

Active Publication Date: 2013-06-26
XINJIANG BAYI IRON & STEEL
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Problems solved by technology

The continuous casting process is prone to hot cracks, and the cooling rate of the billet is too high or the cooling is uneven, which will lead to the breakage of the billet. The rolling process can only hot-roll the slab. At the same time, due to the high strength of the steel pl

Method used

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  • Production method of high-strength saw bit steel coil
  • Production method of high-strength saw bit steel coil
  • Production method of high-strength saw bit steel coil

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Experimental program
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Embodiment

[0030] The key control points of this method, take the saw blade or saw blade steel as an example;

[0031] 1) The production process of this method: converter smelting-LF refining-hot continuous rolling;

[0032] 2) Composition design: See Table 1 for the composition design of saw blade steel.

[0033] Table 1

[0034]

[0035] Adopt carbon, manganese and added V microalloying elements to strengthen the composition design scheme, the content of carbon in the steel is lower than the traditional 50Mn2V, and the control range of carbon is narrow, which ensures the stability of various properties of the steel and improves the rolling time. The plate shape is controlled, and a certain amount of chromium is added at the same time, which improves the hardenability and hardenability of the material.

[0036] 3) Surface defect and segregation control of slab continuous casting

[0037] Since it is a medium-high carbon alloy steel, the crack sensitivity of the slab is extremely s...

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Abstract

The invention provides a production method of a high-strength saw bit steel coil. The production method is suitable for a rolled steel coil of saw bit or saw blade steel with the thickness of 3.0-14.0mm. The component design comprises 0.49-0.52 of C, 0.2-0.35 of Si, 1.45-1.60 of Mn, less than or equal to 0.015 of P, less than or equal to 0.005 of S, 0.2-0.25 of Cr, 0.12-0.16 of V, 0.020-0.025 of Al and less than or equal to 0.006 of N by weight percent. The production process adopts a converter smelting-LF (ladle furnace) refining-hot continuous rolling process and comprises slab continuous casting and segregation control in saw bit steel production, control of the slab continuous offline slow cooling temperature of the saw bit steel and the control of the roll rolling start temperature, the rolling finished temperature and the coiling temperature. The horizontal yield of the saw bit steel coil is MPa600-750, the horizontal tensile strength is MPa930-1040, the elongation is 19.5-26%, and the hardness of HRC is 20-28.

Description

technical field [0001] The invention relates to the field of iron and steel smelting and processing, and is especially suitable for controlling production elements such as component design, slab continuous casting, slab cooling, heat preservation, furnace charging temperature, and steel controlled rolling. Background technique [0002] Traditional saw blade (saw blade) base steel is mostly smelted in electric furnace (converter furnace), LF refining, pouring, etc. The continuous casting process is prone to hot cracks, and the cooling rate of the billet is too high or the cooling is uneven, which will lead to the breakage of the billet. The rolling process can only hot-roll the slab. At the same time, due to the high strength of the steel plate, the yield strength reaches 600-750MPa. The requirements for equipment are high, and the shape of the steel plate is not easy to control, especially after the steel coil is flattened, the shape of the steel coil has defects such as war...

Claims

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Application Information

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IPC IPC(8): C22C38/38C22C38/24C21D8/02C21D11/00B22D11/111B22D11/22B21B37/74
Inventor 吾塔陈勇鲁军张爱梅
Owner XINJIANG BAYI IRON & STEEL
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