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Hot-rolled steel strip, preparation method thereof and application of hot-rolled steel strip in double-metal band saw back material

A technology of steel strip and molten steel, which is applied in the composition design and production field of hot-rolled steel strip for bimetal band saw back material, can solve the problems affecting the service life of the finished saw blade, poor fatigue life, low alloy composition, etc. The effect of hardness, fatigue life improvement, and high steel purity

Pending Publication Date: 2022-04-15
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the service process, fatigue cracks usually appear first on the back material of the band saw, and in severe cases, it will break, directly affecting the service life of the finished saw blade
However, the back material of bimetallic band saw blades currently used is mostly spring steel with low alloy composition and poor fatigue life, which directly affects the service life of the finished saw blade.

Method used

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  • Hot-rolled steel strip, preparation method thereof and application of hot-rolled steel strip in double-metal band saw back material

Examples

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preparation example Construction

[0045] In yet another aspect, the present invention also provides a method for preparing a hot-rolled steel strip, comprising the following steps:

[0046] (1) The molten iron is smelted by converter, LF refining and RH refining to obtain molten steel;

[0047] (2) Carry out continuous casting of molten steel to obtain a continuous casting slab, and the continuous casting slab is sent to the next process after hot delivery and hot charging;

[0048] (3) Heating the continuous casting slab, performing rough rolling after high-pressure water descaling, and then performing finish rolling after high-pressure water descaling to obtain a steel strip; wherein, the heating temperature is 1180°C-1290°C, and the The termination temperature of the rough rolling is 1000°C-1200°C; the termination temperature of the finish rolling is 780°C-950°C;

[0049] (4) performing cooling, coiling, and softening annealing steps on the steel strip in sequence to obtain a hot-rolled steel strip product...

Embodiment 1

[0076] The technical characteristics of the steel strip of the present invention will be described in detail below with this embodiment. The mass percent of the chemical composition of the hot-rolled coil for the back material of the bimetallic band saw in this embodiment is:

[0077]C: 0.33% Si: 0.28 Mn: 0.80 P: 0.008 S: 0.002 Al: 0.041 Cr: 3.60 Mo: 2.20 Ni: 0.86 Nb: 0.045 V: 0.35 N: 0.0046 O: 9.0ppm; H: 1.2ppm; the balance is Fe and inevitable impurity elements.

[0078] The coiled plate of this embodiment has a thickness of 4.0mm, a width of 1015mm, and a length of 462m.

[0079] The yield strength of the hot-rolled state is 1061MPa, the tensile strength is 1367MPa, the elongation is 8.5%, the hardness is HRC52.0, and the thickness of the decarburized layer is 0.00mm. The yield strength of the soft annealed state is 660MPa, the tensile strength is 816MPa, the elongation is 22.0%, the hardness HRB is 97.5, and the total decarburization layer depth of one side is 0.02mm. M...

Embodiment 2-4

[0125] Prepare the hot-rolled steel strip in embodiment 2-4 according to the technical process identical with embodiment 1, wherein, the composition of the hot-rolled steel strip of embodiment 2-4 is shown in Table 1, and the concrete process parameter that embodiment 2-4 adopts, heat The properties of the rolled steel strip are shown in Table 2.

[0126] Composition (wt %) except iron and unavoidable impurity in table 1 embodiment 2-4 hot-rolled strip

[0127] Example C Si mn P S Cr Mo Ni Nb V Al Example 2 0.33 0.24 0.76 0.008 0.001 3.57 2.23 0.85 0.053 0.37 0.051 Example 3 0.32 0.28 0.83 0.006 0.001 3.60 2.28 0.78 0.031 0.38 0.057 Example 4 0.34 0.22 0.74 0.007 0.002 3.54 2.31 0.83 0.038 0.40 0.047

[0128] The process parameters and strip properties of other manufacturing method embodiments of hot-rolled steel strip are shown in Table 2

[0129] The performance (hot-rolled state) of the processing...

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Abstract

The invention belongs to the technical field of medium-carbon high-alloy steel, and relates to a hot-rolled steel strip, a preparation method thereof and application of the hot-rolled steel strip in a double-metal band saw back material. The hot rolled steel strip provided by the invention comprises the following components in percentage by weight: 0.28%-0.40% of C, 0.10%-0.50% of Si, 0.40%-1.20% of Mn, 0.01%-0.10% of Al, less than or equal to 0.020% of P, less than or equal to 0.010% of S, 2.80%-4.10% of Cr, 1.50%-2.60% of Mo, 0.60%-1.40% of Ni, 0.10%-0.60% of V, 0.01%-0.12% of Nb, less than or equal to 0.02% of Cu, less than or equal to 120 ppm of N, less than or equal to 18 ppm of O, less than or equal to 2.4 ppm of H and the balance of Fe and inevitable impurity elements. The hot rolled steel strip for the double-metal band saw back material has high finished product anti-fatigue performance, the idling fatigue test life of the hot rolled steel strip is larger than or equal to 70000 weeks, the fatigue life is prolonged by 30-60% compared with that of traditional saw back steel X32, and the use requirement of the high-fatigue-performance double-metal band saw back material is met.

Description

technical field [0001] The invention belongs to the technical field of medium-carbon high-alloy steel, and relates to a hot-rolled steel strip and its preparation method and its application in the back material of a bimetallic band saw, in particular to a strip with high strength, toughness, high hardness, excellent high-temperature mechanical properties and Composition design and production method of hot-rolled steel strip for bimetallic band saw backing with long fatigue life. Background technique [0002] Bimetal band saw blades are mainly used for cutting high-hardness materials such as various steels, non-ferrous metals and hard precious woods. The tooth material of the bimetal band saw blade is high-speed steel (such as M42 and M51 with high cobalt content), which has high hardness, strong cutting ability and high wear resistance. The back material of the bimetallic band saw blade is made of high-quality spring steel or alloy steel. The back material and the tooth ma...

Claims

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Application Information

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IPC IPC(8): C22C38/48C22C38/02C22C38/04C22C38/06C22C38/44C22C38/46C22C38/42C21D8/02C21D1/32C21C7/064C21C7/10C21C7/00B23D61/12B23P15/00
Inventor 秦洁付培茂王彩焕
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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