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Abrasion-resistant steel for low-alloy ultra-high strength engineering machine and preparation method thereof

An ultra-high-strength, engineering machinery technology, applied in the field of iron-based alloys, can solve problems such as increased user costs and easy wear, and achieve the effects of inhibiting grain growth, increasing nucleation points, and good mechanical properties

Active Publication Date: 2013-02-27
CENT IRON & STEEL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These steels are easy to wear in engineering applications, especially in structures that are exposed to friction, impact, and erosion such as rocks and mineral materials. Frequent replacement will increase user costs

Method used

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  • Abrasion-resistant steel for low-alloy ultra-high strength engineering machine and preparation method thereof
  • Abrasion-resistant steel for low-alloy ultra-high strength engineering machine and preparation method thereof
  • Abrasion-resistant steel for low-alloy ultra-high strength engineering machine and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] The chemical composition of the wear-resistant steel of this embodiment is calculated by mass percentage: C: 0.34%, Si: 0.78%, Mn: 1.57%, Cr: 1.24%, Mo: 0.45%, V: 0.073%, Ti: 0.026% , S: 0.0035%, P: 0.0064%, B: 0.0013%, N: 0.0032%, the rest is Fe and unavoidable impurities.

[0049] Smelt molten steel according to the above ingredients, and then cast it into a slab, forge the slab into a size of 420×70×60 (mm), then heat the slab to 1280°C and keep it for 2 hours, using two-stage controlled rolling, starting at 1080°C Carry out rough rolling, control the intermediate billet temperature above 1000℃, and the cumulative reduction rate of rough rolling is 52%; then carry out finishing rolling at 900℃~940℃, and control the final rolling temperature at 860℃~880℃, and the cumulative reduction ratio of finishing rolling 31%, the obtained steel plate thickness is 20mm.

[0050] After rolling into a steel plate, it is directly quenched and tempered at 250°C for 1.5 hours, and then ai...

Embodiment 2

[0053] The chemical composition of the wear-resistant steel of this embodiment is the same as that of embodiment 1.

[0054] Smelt molten steel according to the above ingredients, then cast it into a slab, forge the slab into a size of 320×70×60 (mm), then heat the slab to 1280°C and keep it for 2 hours, using two-stage controlled rolling, starting at 1080°C Carry out rough rolling, control the intermediate billet temperature above 1000℃, the cumulative reduction rate of rough rolling is 58.3%; then carry out finishing rolling at 900℃~940℃, control the final rolling temperature at 860℃~880℃, and the cumulative reduction ratio of finishing rolling 52%, the thickness of the obtained steel plate is 12mm.

[0055] The heat treatment process is the same as in Example 1, to obtain low-alloy ultra-high-strength wear-resistant steel for construction machinery, and its structure is as figure 2 As shown, the metallographic structure is a tempered martensite structure.

[0056] The tensile st...

Embodiment 3

[0058] The chemical composition of the wear-resistant steel of this embodiment is calculated by mass percentage: C: 0.33%, Si: 0.47%, Mn: 1.61%, Cr: 2.18%, Mo: 0.44%, V: 0.048%, Ti: 0.019% , S: 0.0029%, P: 0.0059%, B: 0.0008%, N: 0.0034%, the rest is Fe and inevitable impurities.

[0059] The molten steel is smelted according to the above composition, and then poured into a slab. The slab is forged to a size of 420×70×60 (mm). The rolling process is the same as that of Example 1, and the thickness of the steel plate is 20mm.

[0060] The heat treatment process is the same as in Example 1, to obtain low-alloy ultra-high-strength wear-resistant steel for construction machinery, and its structure is as image 3 As shown, the metallographic structure is a tempered martensite structure.

[0061] The tensile strength R of the wear-resistant steel product of this embodiment m 1739MPa, yield strength R p0.2 1392MPa, elongation after breaking A 5 11%, the reduction of area Z is 47%, the longi...

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Abstract

The invention belongs to the technical field of iron-base alloy and particularly relates to abrasion-resistant steel for a low-alloy ultra-high strength engineering machine and a preparation method thereof. The abrasion-resistant steel comprises, by mass, 0.20-0.40% of C, 0.40-0.90% of Si, 0.8-2.0% of Mn, 1.00-2.50% of Cr, 0.30-0.60% of Mo, V<=0.08%, Ti<=0.04%, S<=0.004%, 0.004-0.008% of P, B<=0.002%, 0.002-0.005% of N and the balance Fe and inevitable impurities. The abrasion-resistant steel combines reasonable chemical components and a large deformation rolling process, has the advantages of being low in alloy element content, strong in strength, good in toughness, low in cost, good in abrasive resistance and the like, and is suitable for engineering machines, mining equipment, cement equipment and the like.

Description

Technical field [0001] The invention belongs to the technical field of iron-based alloys, and particularly relates to a low-alloy ultra-high-strength wear-resistant steel for engineering machinery and a preparation method thereof. Background technique [0002] Construction machinery is the general term for equipment used in mining and various engineering constructions (such as drilling rigs, electric shovels, electric wheel dump trucks, excavators, loaders, bulldozers, various cranes and coal mine hydraulic supports, etc.). In the cost composition of construction machinery products, the cost of steel is the most important part, and all steel accounts for about 30% of the total cost. The steel used for construction machinery generally requires high strength and high wear resistance. [0003] Low-alloy ultra-high-strength steel is developed on the basis of quenched and tempered structural steel. The main alloying elements are manganese, chromium, silicon, nickel, aluminum, vanadium,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/38C22C38/32C21D8/02
Inventor 唐广波孙浩源刘爽刘正东程杰锋李权
Owner CENT IRON & STEEL RES INST
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