Cold rolling and annealing process for avoiding mixed crystal defect of alloy saw blade steel X32 and application thereof
An annealing process and saw blade steel technology, which is applied in the field of cold rolling and annealing process to avoid alloy saw blade steel X32 mixed crystal defects, can solve the problems of uneven austenite grain size and unstable service life of bimetallic band saw blades, etc. Achieve stable fatigue life, ensure fatigue life, and improve applicability
Pending Publication Date: 2021-08-17
浙江龙盛薄板有限公司
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Problems solved by technology
However, in the above-mentioned cold rolling and annealing process, the coupling effect of cold rolling deformation, annealing temperature and time is likely to cause mixed crystal defects in the cold rolled X32 steel strip, which are then inherited to the back material through the production process of bimetallic band saw blades. The inhomogeneity of austenite grain size in the microstructure will eventually lead to the instability of the service life of the finished bimetallic band saw blade
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[0041] The composition of the alloy saw blade steel X32 hot-rolled plate used is: C 0.32%, Si 0.3%, Mn 1.0%, P 0.01%, S 0.004%, Cr 4.0%, Ni 0.75%, Mo 1.26%, V 0.35%, the rest is Fe and unavoidable impurities.
[0042] Such as figure 1 As shown, the preparation method of the cold-rolled alloy saw blade steel X32 comprises the following steps:
[0043] Put the alloy saw blade steel X32 hot-rolled plate with a thickness of 3.8mm in a bell annealing furnace for annealing treatment at 750°C for 30 hours; place the alloy saw blade steel X32 after the first annealing treatment on a single-stand rolling mill for a cold rolling treatment , rolled into a cold-rolled sheet with a thickness of 1.7mm, and the cumulative deformation was 55.3%; the alloy saw blade steel X32 after the primary cold-rolling was continued to be placed in a bell annealing furnace for secondary annealing at 750°C for 18 hours; the secondary The alloy saw blade steel X32 after annealing is continued to be placed ...
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Abstract
The invention discloses a cold rolling and annealing process for avoiding the mixed crystal defect of cold-rolled alloy saw blade steel X32, and belongs to the technical field of rolling and heat treatment. Alloy saw blade steel X32 is selected, the thickness of a hot rolling raw material is 3.4-3.8 mm, the alloy saw blade steel X32 is heated to 750 DEG C in a cover type annealing furnace for the primary annealing time of 18-30 h, subjected to primary cold rolling on a single-rack rolling mill by the accumulated deformation quantity of larger than 50%, heated to 750 DEG C in a cover annealing furnace for the secondary annealing of more than or equal to 18 hours, and subjected to secondary cold rolling in a single-stand rolling mill to reach the thickness of a cold-rolled finished product of 0.95-1.68 mm. The cold rolling deformation quantity and the cover annealing time are optimally combined, so that the mixed crystal defect in the X32 cold-rolled finished product is avoided, the applicability of the production process of a bimetal band saw blade is remarkably improved, and a uniform and refined structure is obtained in the bimetal band saw blade so as to ensure stable fatigue life.
Description
technical field [0001] The invention relates to the technical field of metal treatment, in particular to a cold rolling and annealing process and an application thereof for avoiding mixed crystal defects of alloy saw blade steel X32. Background technique [0002] The bimetallic band saw blade welded with high-speed steel M42 as the tooth material and high-strength alloy steel X32 as the back material plays an important role in the field of mechanical processing due to its high sawing efficiency, low sawing loss, and wide adaptability. The back material of the bi-metal band saw requires high hardness and wear resistance to resist the wear caused by contact with the cutting metal during sawing. More importantly, the back material of the bi-metal band saw bears different tensions during cutting The alternating load of force, assuming that the loss of the tooth material is not considered, the fatigue life of the back material directly determines the service life of the bimetalli...
Claims
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IPC IPC(8): C21D8/02C21D1/26C21D6/00C22C38/02C22C38/04C22C38/44C22C38/46
CPCC21D8/0236C21D8/0247C21D8/0205C21D6/004C21D6/005C21D6/008C21D1/26C22C38/02C22C38/04C22C38/44C22C38/46
Inventor 王闯窦晓尧
Owner 浙江龙盛薄板有限公司