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High-strength-and-toughness low alloy wear resistant steel and manufacturing method thereof

A high-strength, low-alloy, manufacturing method technology, applied in the field of metallurgy to achieve the effects of increased service life, low production cost, and high hardenability

Inactive Publication Date: 2010-11-10
NORTHEASTERN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems existing in the comprehensive performance and preparation method of the existing low-alloy wear-resistant steel, the present invention provides a high-strength, high-toughness low-alloy wear-resistant steel and its manufacturing method

Method used

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  • High-strength-and-toughness low alloy wear resistant steel and manufacturing method thereof
  • High-strength-and-toughness low alloy wear resistant steel and manufacturing method thereof
  • High-strength-and-toughness low alloy wear resistant steel and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Molten steel is smelted and then poured into slabs, its composition by weight percentage is C 0.19%, Si 0.18%, Mn 1.35%, P0.015%, S 0.002%, Al 0.036%, Ti 0.018%, Cr 0.19%, Mo 0.2 %, B 0.001%, the rest is Fe and unavoidable impurities, carbon equivalent Ceq(%)=0.19+1.35 / 6+0.18 / 24+ 0 / 40 +0.19 / 5+0.2 / 4+ 0 / 14 = 0.510 .

[0032] Heat the slab to 1150°C, keep it warm for 150 minutes, and then carry out rough rolling. Rolling accumulative rolling reduction rate is 31%, and the obtained slab thickness is 30mm.

[0033] The slab is quenched, the heating temperature is 930°C, and the holding time is 1.5×30+16=61min; after heat preservation, it is cooled to room temperature at a speed of at least 40°C / s to obtain high-strength, high-toughness, low-alloy wear-resistant steel, microstructure Such as figure 1 As shown, after quenching treatment, a composite structure of high hardness martensite, lower bainite and dispersed fine carbides is obtained.

[0034]The surface Brinell h...

Embodiment 2

[0036] The molten steel is smelted, and then poured into a slab, the composition of which is the same as that of Example 1; the carbon equivalent is the same as that of Example 1.

[0037] Heat the slab to 1160°C, keep it warm for 160 minutes, and then carry out rough rolling. Rolling accumulative rolling reduction is 32%, and the obtained slab thickness is 30mm.

[0038] The slab is subjected to sub-temperature quenching treatment, the heating temperature is 810°C, and the holding time is 1.5×30+3=48min; after heat preservation, it is cooled to room temperature at a speed of at least 40°C / s to obtain high-strength, high-toughness, low-alloy wear-resistant steel , organized as figure 2 As shown, after heat treatment, a composite structure of high hardness martensite, lower bainite, fine and evenly distributed ferrite and dispersed fine carbides is obtained.

[0039] The surface Brinell hardness of the product is HB418, the tensile strength is 1400Mpa, the elongation at brea...

Embodiment 3

[0041] Molten steel is smelted, and then poured into a slab, its composition is the same as that of Example 1, and its carbon equivalent is the same as that of Example 1.

[0042] Heat the slab to 1170°C, keep it warm for 160 minutes, and then carry out rough rolling. The rough rolling start temperature is 1070°C, the final rolling temperature is 970°C, and the cumulative reduction rate of rough rolling is at least 80%. Then, finish rolling is carried out at 880-930°C. The cumulative reduction ratio of finish rolling is 34%, and the obtained slab thickness is 30mm.

[0043] The slab is firstly subjected to complete quenching treatment and then sub-temperature quenching treatment. When quenching, it is first heated to a temperature of 950°C, and the holding time is 1.5×30+16=61min. After holding the heat, it is cooled to room temperature at a speed of at least 40°C / s. During sub-temperature quenching, heat to a temperature of 830°C. The holding time is 1.5×30+18=63min. After he...

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Abstract

The invention relates to high-strength-and-toughness low alloy wear resistant steel and a manufacturing method thereof, belonging to the technical filed of metallurgy. The high-strength-and-toughness low alloy wear resistant steel comprises the following components by weight percent: 0.15-0.20% of C, 0.1-0.5% of Si, 1.2-1.6% of Mn, less than or equal to 0.015% of P, less than or equal of 0.005% S, 0.02-0.04% of Al, 0.016-0.022% of Ti, 0.16-0.20% of Cr, 0.16-0.22% of Mo, 0.001-0.0015% of B and the balance of Fe, and simultaneously the carbon equivalent Ceq (%) is less than or equal to 0.55. The manufacturing method comprises the following steps: smelting molten steel and pouring into a slab, and carrying out rough rolling after heating and heat insulation; and then carrying out complete quenching treatment, or sub-temperature quenching treatment, or carrying out the complete quenching treatment and then carrying out the sub-temperature quenching treatment, and adopting low temperature tempering to eliminate stress after the quenching. The method of the invention ensures higher hardness, simultaneously can obviously improve the impact toughness of steel plates, increase the impact resistance of the steel plates, and prolong the service life of mechanical equipment, and can obtain wear resistant steel plates with different strength and toughness grades by using the steel with same components and different quenching processing methods.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a high-strength, high-toughness low-alloy wear-resistant steel and a manufacturing method thereof. Background technique [0002] Low-alloy wear-resistant steel is mainly used in mechanical equipment such as engineering, mining, construction, agriculture, cement production, ports, electric power and metallurgy with harsh working conditions, such as bulldozers, loaders, excavators, dump trucks and various mining machinery, etc. . Not only high strength and hardness are required to resist wear, but also a certain impact resistance is required. According to different conditions of use, users have different requirements for the performance of wear-resistant steel products. Wear-resistant steel plates with different hardness and toughness should be used to achieve the purpose of prolonging the service life of mechanical equipment. At present, the impact toughness of lo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/38C22C38/32C21D1/18
Inventor 王昭东曹艺吴迪张逖梁江民
Owner NORTHEASTERN UNIV
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