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A low yield ratio martensite-ferrite-austenite composite wear-resistant steel plate and its manufacturing method

A wear-resistant steel plate and low yield ratio technology, applied in the field of low-alloy steel manufacturing, can solve the problems of low-temperature impact toughness of steel plate, difficulty in cold-bending formability, poor low-temperature toughness and formability of steel plate, etc., and achieve excellent low-temperature impact toughness and cold-bending performance, reducing the yield ratio, the effect of high and low temperature impact toughness and wear resistance

Active Publication Date: 2019-08-27
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In order to ensure that the steel plate has high wear resistance, the hardness and strength of this type of steel plate are generally very high, among which the Brinell hardness is often required to be ≥300HB, and the tensile strength is required to be ≥1000MPa, so that the low temperature impact toughness, cold Bending performance is difficult to guarantee
At present, among the more commonly used wear-resistant steels, the matrix structure is lath martensite. Although this type of structure can make the steel plate obtain extremely high strength and hardness and ensure wear resistance, but due to the martensite It has the characteristics of extremely high brittleness, which makes the low-temperature toughness and formability of the obtained steel plate poor. Grinding pipes and other wear-resistant parts

Method used

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  • A low yield ratio martensite-ferrite-austenite composite wear-resistant steel plate and its manufacturing method
  • A low yield ratio martensite-ferrite-austenite composite wear-resistant steel plate and its manufacturing method
  • A low yield ratio martensite-ferrite-austenite composite wear-resistant steel plate and its manufacturing method

Examples

Experimental program
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Effect test

Embodiment 1

[0033]The chemical composition of embodiment 1 is as shown in table 1. According to the chemical composition of Example 1 in Table 1, the electric furnace or converter is smelted, and after refining, it is poured into a continuous casting slab, and the continuous casting slab is heated to 1200 ° C, kept for 3 hours, and then the medium and thick steel plate rolling mill is used for controlled rolling and control Cooling process, in which the rough rolling pass is 4 passes, the rough rolling finish rolling temperature is 1020°C; the finish rolling pass is 5 passes, the finish rolling finish rolling temperature is 840°C; the steel plate rolling thickness is 20mm; Air cooling to 780°C, then rapid cooling to 380°C, and finally stacking and slow cooling to room temperature; tempering heat treatment is carried out on the rolled steel plates, wherein the tempering temperature is 220°C, and the tempering holding time is 48 minutes.

[0034] The mechanical properties of the finished st...

Embodiment 2

[0037] The chemical composition of embodiment 2 is as shown in table 1. According to the chemical composition of Example 2 in Table 1, the electric furnace or converter is smelted, and after refining, it is poured into continuous casting slabs, and the continuous casting slabs are heated to 1180 ° C and kept for 3.5 hours, and then the hot continuous rolling mill is used for controlled rolling and control. Cooling process, the rolling process is: rough rolling 7 times, rolling the steel billet into a 30mm intermediate billet, and then rolling it into a 6mm finished steel coil through a 7-stand rolling mill. The final rolling temperature is 880°C. Controlled cooling, and then coiled into steel coils, the controlled cooling process is: first air-cooled to 770°C, then rapidly cooled to about 350°C, and finally coiled and slowly cooled to room temperature; the rolled steel coils are cooled in a bell annealing furnace Low temperature tempering heat treatment, wherein the tempering ...

Embodiment 3

[0041] The chemical composition of embodiment 3 is as shown in table 1. Carry out electric furnace or converter smelting according to the chemical composition of Example 3 in Table 1, pour into continuous casting slab or steel ingot after refining, the continuous casting slab or steel ingot is heated to 1250 ℃, keep warm for 2 hours, and then use hot continuous rolling mill to control Rolling and controlled cooling process, the rolling process is: rough rolling 5 times, rolling the billet into a 50mm intermediate billet, and then rolling it into a 10mm finished steel coil through a 7-stand rolling mill, where the final rolling temperature is 880°C , After controlled cooling after rolling, and then coiled into steel coils, the controlled cooling process is: first air-cooled to 790°C, then rapidly cooled to about 380°C, and finally coiled and slowly cooled to room temperature; Low-temperature tempering heat treatment is carried out in the annealing furnace, wherein the tempering...

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Abstract

The invention provides a low yield ratio martensite-ferrite-austenite composite phase wear-resistant steel plate and a manufacturing method thereof. The steel plate manufacturing method is: selecting different alloy components for smelting, continuous casting into steel billets, and manufacturing through processes such as heating, controlled rolling, controlled cooling, and heat treatment. Its characteristics are: (1) The structure of the manufactured steel plate is a martensite-ferrite-austenite multi-phase composite structure; (2) The yield strength of the manufactured steel plate is significantly lower than that of traditional wear-resistant steel plates, and the yield-strength ratio ≤0.75, with excellent formability; (3) The hardness of the manufactured steel plate is between 300 and 420HB, which provides guarantee for obtaining good wear resistance; (4) The wear resistance is excellent, and the wear-resistant steel plate obtained by the present invention is the same as The wear resistance of martensitic wear-resistant steel plate with single hardness is more than doubled. The above-mentioned steel plates have good welding performance and higher low-temperature impact toughness, and are especially suitable for the manufacture of equipment or parts such as concrete mixing tank drums, dump truck compartments and pipes for channel dredging.

Description

technical field [0001] The invention belongs to the field of low-alloy steel manufacturing, and in particular relates to a wear-resistant steel plate with a low yield ratio martensite-ferrite-austenite multiphase composite structure and a preparation method thereof. Background technique [0002] Wear-resistant steel plates are widely used in the manufacture of equipment such as mining machinery, construction machinery, cement chemical machinery and metallurgical machinery. The working environment of such equipment is generally very harsh, and the steel plate is required not only to have extremely high strength and hardness, but also to have a certain Low temperature impact toughness, when used in special parts such as some construction machinery, also requires the steel plate to have excellent welding performance and cold bending performance. In order to ensure that the steel plate has high wear resistance, the hardness and strength of this type of steel plate are generally ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/14C21D8/02
Inventor 邓想涛王昭东贾晔王国栋
Owner NORTHEASTERN UNIV LIAONING
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