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A kind of production process of alloy tool steel wire rod with full bainite structure

An alloy tool steel, full bainite technology, applied in the field of rolling, can solve the problems of high wire rod hardness, non-uniform wire rod structure, non-uniform tool performance, etc. The effect of precipitation and shortening of phase transition incubation period

Active Publication Date: 2021-11-02
ZENITH STEEL GROUP CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the particularity of the composition design of this steel grade, it is difficult to control the microstructure uniformly during the rolling process of the wire rod, and usually a martensite + bainite-based composition of martensite + bainite + pearlite + ferrite is obtained. Mixed structure, especially when the martensite-based microstructure is formed, the wire rod has high hardness and is prone to brittle fracture during packaging, transportation and user processing
At the same time, the structure of the wire rod is not uniform, it is difficult for the user to obtain a uniform spheroidized structure, the control of the spheroidized annealing is difficult and the cost is high, and the performance of the tool during processing and heat treatment is not uniform, which directly affects the service performance of the tool.

Method used

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  • A kind of production process of alloy tool steel wire rod with full bainite structure
  • A kind of production process of alloy tool steel wire rod with full bainite structure
  • A kind of production process of alloy tool steel wire rod with full bainite structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1. Blank opening

[0027] The composition of the continuous casting slab is calculated by mass percentage (wt%). The composition is C: 0.68, Si: 1.08, Mn: 0.50, P: 0.012, S: 0.008, Cr: 0.25, Ni: 0.15, Cu: 0.03, Al: 0.025, Mo: 0.45, V: 0.20, Nb: 0.015, and the rest are iron. The continuous casting slab is heated in the heating furnace for a total of 330 minutes, the soaking section temperature is 1230-1250° C., the soaking section time is 260 minutes, and the intermediate slab is rolled.

[0028] 2. Intermediate billet heating

[0029] The intermediate billet that has been finished to remove surface defects and decarburized layers is heated in the furnace for 220 minutes. The temperature of the high temperature section is 1040-1080°C, the time of the high temperature section is 100 minutes, and the air-fuel ratio of the heating section and the high temperature section is 0.45.

[0030] 3. Intermediate billet rolling

[0031] Rolling is carried out by finishing rolling...

Embodiment 2

[0035] 1. Blank opening

[0036] The composition of the continuous casting slab is calculated by mass percentage (wt%). The composition is C: 0.68, Si: 1.08, Mn: 0.50, P: 0.012, S: 0.008, Cr: 0.25, Ni: 0.15, Cu: 0.03, Al: 0.025, Mo: 0.45, V: 0.20, Nb: 0.015, and the rest are iron. The continuous casting slab is heated in the heating furnace for a total of 350 minutes, the soaking section temperature is 1210-1240°C, the soaking section time is 280 minutes, and the intermediate slab is rolled.

[0037] 2. Intermediate billet heating

[0038] The intermediate billet that has been finished to remove surface defects and decarburized layers is heated in the furnace for 250 minutes, the temperature of the high temperature section is 1030-1050°C, the time of the high temperature section is 110 minutes, and the air-fuel ratio of the heating section and the high temperature section is 0.45.

[0039] 4. Intermediate billet rolling

[0040] Rolling is carried out by finishing rolling +...

Embodiment 3

[0044] 1. Blank opening

[0045] The composition of the continuous casting slab is calculated by mass percentage (wt%). The composition is C: 0.68, Si: 1.08, Mn: 0.50, P: 0.012, S: 0.008, Cr: 0.25, Ni: 0.15, Cu: 0.03, Al: 0.025, Mo: 0.45, V: 0.20, Nb: 0.015, and the rest are iron. The continuous casting slab is heated in the heating furnace for a total of 400 minutes, the soaking section temperature is 1230-1250°C, the soaking section time is 290 minutes, and the intermediate slab is rolled.

[0046] 2. Intermediate billet heating

[0047] The intermediate blank that has been finished to remove surface defects and decarburized layers is heated in the furnace for 280 minutes, the temperature of the high temperature section is 1020-1040°C, the time of the high temperature section is 110 minutes, and the air-fuel ratio of the heating section and the high temperature section is 0.45.

[0048] 5. Intermediate billet rolling

[0049] Rolling is carried out by finishing rolling + MI...

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Abstract

The invention discloses a production process for alloy tool steel hot-rolled wire rods with a full bainite structure. Higher than 1100°C; in the rolling process, the finishing rolling + MINI unit is used for rolling to realize the non-recrystallization zone and α + γ large deformation rolling, the cumulative area reduction rate reaches 55-85%, and the austenite structure is in the During the deformation process, a large number of crystal defects such as dislocations and deformation bands are produced, and the resulting deformation stores energy, which shortens the incubation period of phase change and increases the driving force of phase change; the spinning temperature in the cooling process is 750-800 °C, and Stelmore controlled cooling . The invention effectively prevents the precipitation of martensite and the mixture of martensite, pearlite and ferrite in the rolling cooling process, obtains a full bainite structure, avoids brittle fracture of the martensite structure, and is beneficial to the processing and use of wire rods and improve fatigue performance.

Description

technical field [0001] The invention belongs to the technical field of rolling, and relates to a production method of an alloy tool steel wire rod, in particular to a blanking, heating, rolling and cooling process of an alloy tool steel wire rod with a full bainite structure. Background technique [0002] Alloy tool steel is a type of steel that adds chromium, molybdenum, vanadium and other alloying elements on the basis of carbon tool steel to improve hardenability, toughness, wear resistance and heat resistance. It is mainly used to manufacture measuring tools and cutting tools , impact-resistant tools, cold and hot molds and some special-purpose tools. [0003] The steel used for electric hand tools is a steel type with higher requirements among alloy tool steels. It is required to have high torque, hardness, wear resistance, impact toughness and service fatigue performance, so carbon, silicon, vanadium, molybdenum and nickel are added to the composition design. , niobiu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/02C21D6/00C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46C22C38/48
CPCC21D6/004C21D6/005C21D6/008C21D8/0205C21D8/0226C21D8/0263C21D2211/002C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46C22C38/48
Inventor 屠兴圹左锦中苏振伟张盛华周淼高协清林俊万文华
Owner ZENITH STEEL GROUP CORP
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