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Production technology method of low content alloy ultrahigh hardness wear-resistant steel plate

A wear-resistant steel plate and production process technology, which is applied in the field of low-alloy ultra-high hardness wear-resistant steel plate production process, can solve problems such as difficulty in large-scale industrial promotion, impossibility of rolling production, complex smelting process, etc., to achieve easy production and maintenance, Improve the comprehensive mechanical properties and service life, the effect of low investment cost

Inactive Publication Date: 2011-04-20
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this patent is that it needs to add a modifier, the smelting process is complicated, and it is not easy to control stably
Chinese patent application (application number 200510079346.6) "ultrafine bainite wear-resistant steel and its manufacturing process" discloses a high carbon MnCrWSiA1V series low alloy steel, the defect is that the high carbon content makes it impossible to produce in the form of rolling, so it is difficult to Scale industrial promotion
Another example is the 2000 Chinese patent application (application number 00125376.X) "high hardness and wear-resistant low-carbon alloy steel plate". This patent can only realize the hardness of the steel plate from 400 to 500HB, but it is helpless for the ultra-high hardness above 500HB
In addition, the traditional high-alloy wear-resistant steel is gradually eliminated by the market due to defects such as high cost, complicated smelting process, and difficult processing.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The molten steel is continuously cast into a billet of 230mm, and its chemical composition is 0.23% for C, 0.40% for Si, 1.7% for Mn, 1.2% for Cr, 0.004% for B, 0.30% for Ni, 0.30% for Mo, and Nb Accounted for 0.06%, V accounted for 0.04%, Ti accounted for 0.014%, the rest is Fe and unavoidable impurities. The billets were soaked at 1220°C and held for 150 minutes, then descaled by high-pressure water, rough rolling and finish rolling were carried out, the rough rolling start temperature was 1170°C, the rough rolling finish temperature was 1040°C; the thickness of the intermediate billet was 80mm. The intermediate billet is air-cooled and waits until the temperature reaches 930°C to start finish rolling, and the finish rolling temperature is 830°C.

[0016] The rolled 12mm steel plate is subjected to intensive controlled cooling, the starting cooling temperature is 820°C, the cooling rate is 28°C / s, and the final cooling temperature is 450°C; then air-cooled to room tem...

Embodiment 2

[0019] The molten steel is continuously cast into a billet of 300mm, and its chemical composition is 0.24% for C, 1.85% for Si, 1.8% for Mn, 1.3% for Cr, 0.004% for B, 0.40% for Ni, 0.40% for Mo, and Nb It accounts for 0.07%, V accounts for 0.05%, Ti accounts for 0.013%, and the rest is Fe and unavoidable impurities. The billet was soaked at 1230°C and held for 240 minutes, and then descaled by high-pressure water, followed by rough rolling and finish rolling. The rough rolling start temperature was 1180°C, the rough rolling finish temperature was 1050°C; The intermediate billet is air-cooled and waits until the temperature reaches 930°C to start finish rolling, and the finishing rolling temperature is 840°C.

[0020] The rolled 40mm steel plate is subjected to intensive controlled cooling, the initial cooling temperature is 830°C, the cooling rate is 26°C / s, and the final cooling temperature is 460°C; then air-cooled to room temperature, and then heated for 80 minutes to quen...

Embodiment 3

[0023] The molten steel is continuously cast into a billet of 280mm, and its chemical composition is 0.22% for C, 1.90% for Si, 1.8% for Mn, 1.2% for Cr, 0.004% for B, 0.45% for Ni, 0.35% for Mo, and Nb 0.08%, V 0.05%, Ti 0.013%, and the rest are Fe and unavoidable impurities. The billet was soaked at 1230°C and held for 200 minutes, and then descaled by high-pressure water, followed by rough rolling and finish rolling. The rough rolling start temperature was 1170°C, and the rough rolling finish temperature was 1050°C; the thickness of the intermediate billet was 80mm. The intermediate billet is air-cooled and waits until the temperature reaches 930°C to start finish rolling, and the finishing rolling temperature is 840°C.

[0024] The rolled 20mm steel plate is subjected to intensive controlled cooling, the initial cooling temperature is 830°C, the cooling rate is 28°C / s, and the final cooling temperature is 440°C; then air-cooled to room temperature, and then heated for 60 m...

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Abstract

The invention provides a production technology method of a low content alloy ultrahigh hardness wear-resistant steel plate, belonging to the field of metal material; the production technology method is characterized in that: enhanced control cooling and once more off-line heating quenching process routes are carried out to the rolled steel plate; especially, enhanced control cooling is carried out to the rolled steel plate, the cooling starting temperature is 850-780 DEG C, the cooling speed is controlled to be 15-30 DEG C / s, and the final cooling temperature is 350-550 DEG C; then the temperature is naturally cooled to room temperature, and the steel plate is heated for 10-120min and is quenched to be at room temperature, and the quenching temperature is 950-900 DEG C; 100-400 DEG C tempering is carried out to the quenched steel plate, and the tempering time is 20-180min. the hardness of the wear-resistant steel plate produced by the invention is more than 500HB and the total alloy amount is less than 6 percent; therefore, the production technology method has the advantages of low cost, high additional value, stable process and easy realization.

Description

technical field [0001] The invention belongs to the field of metal materials, and in particular relates to a production process method of a low-alloy ultrahigh-hardness wear-resistant steel plate. Background technique [0002] In various industrial sectors such as metallurgy, mining, machinery manufacturing and military affairs, many steels for workpieces and machine equipment fail rapidly due to wear and tear, causing huge losses to the national economy. In order to improve the wear resistance of steel parts and prevent early failure of materials, the steel plates must be hardened. For example, the Chinese patent application (Application No. 200510025978.4) "A Preparation Process for Bainite Wear-resistant Steel Plate" discloses that HRC hardness of 30-50 and tensile strength greater than 1000Mpa can be achieved by adding modifiers and multi-element microalloying treatment. The disadvantage of this patent is that it needs to add a modifier, the smelting process is complica...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/02C21D1/18C22C38/58C22C38/54C22C38/38C22C38/34C22C38/32
Inventor 武会宾王立军蔡庆伍余伟唐荻田国平
Owner UNIV OF SCI & TECH BEIJING
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