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42Mn wide steel stripe for knife die and manufacturing method thereof

A manufacturing method and mold technology, which are applied to wide steel strips for 42Mn knife molds and the field of manufacturing thereof, can solve the problems of thick oxide layer on the surface of narrow steel strips, high production cost of knife molds, limited width of narrow steel strips, etc., and reduce raw materials. Inventory, lower alloy cost, good surface quality

Active Publication Date: 2012-10-10
新余钢铁股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Because the steel strip contains high Cr (0.85%~1.10%), Mo (0.15%~0.25%) and other precious metal elements, the production cost of the cutting tool and mold industry is relatively high; in addition, the surface oxide layer of the narrow steel strip is thick, and the size deviation is large , and the width of the narrow steel belt is limited, it is not convenient for cutting, the stock of raw materials is high, and the utilization rate of materials is low

Method used

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  • 42Mn wide steel stripe for knife die and manufacturing method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The 42Mn knife die of present embodiment is with wide steel band, and manufacturing process is as follows:

[0023] (1) Steelmaking process: use top-bottom double-blown oxygen converter for smelting, molten steel is refined in LF furnace, alloy is added, after the composition of molten steel reaches the design requirements of the present invention, calcium feeding line 680m, soft blowing time of argon for 5 minutes, refining At the end, the molten steel is sent to the continuous casting workshop for continuous casting into slabs, and the tundish temperature is 1500°C to 1525°C. Sampling test, slab composition by mass percentage: C 0.39%, Mn 0.95%, Si 0.35%, Cr 0.30%, Ti 0.045%, P 0.016%, S 0.006%, Alt 0.035%, the rest is iron Fe and unavoidable impurity elements;

[0024] (2) Heating process: the slab is heated to 1250°C, and the total heating time is controlled at 0.7 minutes / mm;

[0025] (3) Rolling process: The target thickness of the steel strip is 2.3mm and the w...

Embodiment 2

[0028] The 42Mn knife die of present embodiment is with wide steel band, and manufacturing process is as follows:

[0029] (1) Steelmaking process: use top-bottom double-blown oxygen converter for smelting, molten steel is refined in LF furnace, alloy is added, after the composition of molten steel meets the design requirements of the present invention, calcium wire is fed 720m, soft argon blowing time is 6 minutes, refining At the end, the molten steel is sent to the continuous casting workshop for continuous casting into slabs, and the tundish temperature is 1500°C to 1525°C. Sampling test, slab composition by mass percentage: C 0.41%, Mn 0.85%, Si 0.32%, Cr 0.22%, Ti 0.050%, P 0.020%, S 0.004%, Alt 0.010%, the rest is iron Fe and unavoidable impurity elements;

[0030] (2) Heating process: heat the slab to 1230°C, and the total heating time is controlled at 0.8 minutes / mm;

[0031] (3) Rolling process: the target thickness of the steel strip is 3.0mm, and the width is 105...

Embodiment 3

[0034] The manufacturing process of the present embodiment is as follows:

[0035] (1) Steelmaking process: use top-bottom double-blown oxygen converter for smelting, molten steel is refined in LF furnace, alloy is added, after the composition of molten steel meets the design requirements of the present invention, calcium wire is fed 650m, soft argon blowing time is 8 minutes, refining At the end, the molten steel is sent to the continuous casting workshop for continuous casting into slabs, and the tundish temperature is 1500°C to 1525°C. Sampling test, slab composition by mass percentage: C 0.46%, Mn 0.80%, Si 0.18%, Cr 0.10%, Ti 0.010%, P 0.020%, S 0.010%, Alt 0.010%, the rest is iron Fe and unavoidable impurity elements;

[0036](2) Heating process: heat the slab to 1220°C, and the total heating time is controlled at 0.9 minutes / mm;

[0037] (3) Rolling process: The target thickness of the steel strip is 3.5mm, and the width is 1220mm. The hot tandem rolling mill is used ...

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Abstract

The invention discloses a 42Mn wide steel stripe for a knife die and a manufacturing method of the wide steel stripe. The wide steel stripe comprises the chemical components by weight percent: 0.39%-0.46% of C, 0.80%-0.95% of Mn, 0.18%-0.35% of Si, 0.10-0.30% of Cr, 0.010%-0.050% of Ti, less than or equal to 0.020% of P, less than or equal to 0.010% of S, 0.010%-0.050% of Alt, and the balance of Fe and inevitable impurity elements. The manufacturing method comprises the processes of: a steelmaking process: smelting by adopting a top-bottom combined blowing oxygen converter, refining molten steel by an LF (ladle furnace); and conveying the molten steel to a continuous casting workshop to carry out continuous casting to form a plate blank; a heating process: heating the plate blank to be at 1190-1250 DEG C, and controlling the total heating time according to 0.7-1.0min / mm; and a rolling process: controlling and rolling the heated plate blank by using a hot rolling mill, and coiling to form the steel strip, wherein the hot continuous rolling finishing temperature range is within 850-920 DEG C, and the coiling temperature range is within 640-720 DEG C. The 42Mn brand wide strip produced by using the method replaces a 30CrMo brand narrow steel strip to be supplied to a knife die factory for manufacturing the knife die, and the demands of the knife die manufacturing industry on purchase cost, width, precision, performance and surface quality of the steel strip are met.

Description

technical field [0001] The invention relates to the technical field of manufacturing hot-rolled steel strips, in particular to a wide steel strip for 42Mn cutting dies and a manufacturing method thereof. Background technique [0002] GB / T 709-2006 "Size, shape, weight and allowable deviation of hot-rolled steel plates and strips" defines steel strips with a width of not less than 600mm as wide steel strips. In the knife mold industry, the knife molds used for cutting and blanking leather, silk, textiles, paper, fiberboard, rubber, latex and other products are usually made of 30CrMo narrow steel strips. The process is to divide the hot-rolled steel strips into strips and then cool them It is made by rolling out the blank with cutting edge and then heat treatment. Because the steel strip contains high Cr (0.85%~1.10%), Mo (0.15%~0.25%) and other precious metal elements, the production cost of the cutting tool and mold industry is relatively high; in addition, the surface oxid...

Claims

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Application Information

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IPC IPC(8): C22C38/28
Inventor 冷光荣赵和明吕瑞国唐小勇邹锦忠管兴伟刘志芳
Owner 新余钢铁股份有限公司
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