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Low alloy high tenacity Q-P-T wear-resistant steel plate and manufacturing method thereof

A technology of Q-P-T and wear-resistant steel plate, which is applied in the direction of metal rolling, manufacturing tools, heat treatment equipment, etc., can solve the problems of insignificant improvement of toughness, unguaranteed hardness, complex process, etc., to reduce the formation and expansion of cracks , reduce weight and improve transportation efficiency

Active Publication Date: 2018-05-08
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After tempering, low temperature tempering does not significantly improve toughness, medium temperature tempering will produce temper brittleness, high temperature tempering will significantly improve impact toughness but hardness cannot be guaranteed
[0005] At present, regarding the quenching-partitioning-tempering process, such as the Chinese patent CN201110271109.5, a multi-cycle quenching-partitioning-tempering process is disclosed. Compared with the Q-P-T process, it consumes energy, has low efficiency, and has a complicated process flow.

Method used

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  • Low alloy high tenacity Q-P-T wear-resistant steel plate and manufacturing method thereof
  • Low alloy high tenacity Q-P-T wear-resistant steel plate and manufacturing method thereof
  • Low alloy high tenacity Q-P-T wear-resistant steel plate and manufacturing method thereof

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Experimental program
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Effect test

Embodiment 1

[0026] A low-alloy high-toughness Q-P-T wear-resistant steel plate, the mass percentage of its chemical composition is shown in Table 1.

[0027] Table 1 embodiment wear-resistant steel chemical composition (wt.%)

[0028]

[0029] The specific preparation process of the wear-resistant steel plate is as follows:

[0030] (1) Smelting and casting: each raw material is weighed respectively according to the design composition, mixed evenly, and smelted and casted to obtain a slab;

[0031] (2) Hot rolling process: heat the slab prepared in step 1 from room temperature to 1150° C., and keep it warm for 1 hour. The rolling start temperature is 1050° C., the hot rolling finish rolling temperature is 820° C., and the thickness of the hot rolled plate is 10 mm.

[0032] (3) Q-P-T heat treatment process: water-cool the hot-rolled slab to 220°C on the cooling line, and control the cooling rate at 40-60°C / s. Then the cooled slab is quickly sent to a constant temperature furnace at ...

Embodiment 2

[0039] A low-alloy high-toughness Q-P-T wear-resistant steel plate, the mass percentage of its chemical composition is shown in Table 1.

[0040] The specific preparation process of the wear-resistant steel plate is as follows:

[0041] (1) Smelting and casting: each raw material is weighed respectively according to the design composition, mixed evenly, and smelted and casted to obtain a slab;

[0042](2) Hot rolling process: heat the slab prepared in step 1 from room temperature to 1150° C., and keep it warm for 1 hour. The rolling start temperature is 1050° C., the hot rolling finish rolling temperature is 820° C., and the thickness of the hot rolled plate is 10 mm.

[0043] (3) Q-P-T heat treatment process: water-cool the hot-rolled slab to 220°C on the cooling line, and control the cooling rate at 40-60°C / s. Then the cooled slab is quickly sent to a constant temperature furnace at 350°C for tempering for 1 hour, and then cooled to room temperature.

[0044] Table 3 is a...

Embodiment 3

[0048] A low-alloy high-toughness Q-P-T wear-resistant steel plate, the mass percentage of its chemical composition is shown in Table 1.

[0049] The specific preparation process of the wear-resistant steel plate is as follows:

[0050] (1) Smelting and casting: each raw material is weighed respectively according to the design composition, mixed evenly, and smelted and casted to obtain a slab;

[0051] (2) Hot rolling process: heat the slab prepared in step 1 from room temperature to 1150° C., and keep it warm for 1 hour. The rolling start temperature is 1050° C., the hot rolling finish rolling temperature is 820° C., and the thickness of the hot rolled plate is 10 mm.

[0052] (3) Q-P-T heat treatment process: water-cool the hot-rolled slab to 220°C on the cooling line, and control the cooling rate at 40-60°C / s. Then the cooled slab is quickly sent to a constant temperature furnace at 400°C for tempering for 1 hour, and then cooled to room temperature.

[0053] Table 4 is ...

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Abstract

The invention relates to the field of material heat treatment, and discloses a low alloy high tenacity Q-P-T wear-resistant steel plate and a manufacturing method thereof. The low alloy high tenacityQ-P-T wear-resistant steel plate comprises, by mass, 0.2-0.4% of C, 0.1-0.5% of Si, 0.5-1.5% of Mn, 0.5-1.2% of Cr, 0.1-0.3% of Mo, 0.02-0.08% of Ni, 0.04-0.1% of Cu, 0.001-0.008% of V, 0.01-0.04% ofTi, 0.01-0.05% of Nb, 0.001-0.003% of B, less than 0.015% of P, less than 0.005% of S, less than 0.006% of N, and the balance Fe and inevitable impurities. The low alloy high tenacity Q-P-T wear-resistant steel plate adopts the technique of Q-P-T heat treatment to manufacture the high tenacity wear-resistant steel. Microstructures are martensite, bainite, and retained austenite. Microalloy elements of V, Ti and Nb have effects of fine grain strengthening and precipitation strengthening. Therefore, the wear-resistant steel is good in abrasion performance, and high in tenacity.

Description

technical field [0001] The invention relates to the technical field of material heat treatment, in particular to a low-alloy high-toughness Q-P-T wear-resistant steel plate and a preparation method thereof. Background technique [0002] Wear-resistant steel is a type of steel material widely used in various wear conditions. Its purpose is to slow down the wear and tear of mechanical parts, improve the life of products, and prolong the time for mechanical products to fail due to wear. It requires high The hardness value to ensure the friction and wear resistance under severe working conditions. Many wearing parts of mechanical equipment are often subject to impact loads in actual working conditions. Therefore, in addition to the hardness requirements for wear-resistant materials, higher requirements are also placed on the toughness of materials. Wear is one of the main failure modes of mechanical parts. The service process of industrial equipment such as mining, metallurgy, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C33/04B21B1/22C21D1/78C21D9/00
CPCB21B1/22B21B2001/225C21D1/78C21D9/0081C21D2211/001C21D2211/002C21D2211/008C22C33/04C22C38/001C22C38/002C22C38/02C22C38/04C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50
Inventor 宋仁伯温二丁姜龙
Owner UNIV OF SCI & TECH BEIJING
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