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H13 steel with high strength, toughness and wear resistance and smelting method thereof

A high-strength, toughness and wear-resistant technology, applied in the field of H13 steel and its smelting, can solve problems such as the reduction of tensile strength-yield-strength ratio, and achieve the effect of improving wear resistance, high impact toughness and strength, and preventing a large amount of burnout

Inactive Publication Date: 2021-05-18
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The increase of N content increases the M / A composition, thereby improving the overall strain stress capacity of the microstructure, and ultimately leads to an increase in tensile strength and a decrease in yield strength ratio

Method used

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  • H13 steel with high strength, toughness and wear resistance and smelting method thereof
  • H13 steel with high strength, toughness and wear resistance and smelting method thereof
  • H13 steel with high strength, toughness and wear resistance and smelting method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Cut the heat-treated steel into small pieces of 10mm×10mm×15mm, pass through 60#, 400#, 800#, 1000#, 1200#, 1500#, 2000#, and then use 0.5μm polishing paste on the polishing machine Polish and etch with 5% nitric acid solution. Observe the microstructure of H13 steel on an optical microscope model OLYMPUSGX51, such as figure 1 shown.

Embodiment 2

[0039] The difference from Example 1 is that electrolytic polishing is used after sanding. The electrolytic polishing liquid is 20% perchloric acid alcohol solution, the voltage is 20V, the current is 0.7A, the room temperature is polished, and the electrolysis time is 25s. The width of the martensitic lath and the orientation relationship between phases in H13 steel were observed on the in-situ scanning Auger probe model PHI710, as shown in figure 2 shown.

Embodiment 3

[0041]After the tensile test of H13 steel, the fracture morphology was observed using a Geminisem 500 field emission scanning electron microscope. The voltage is 20KV, the working distance is 13.4mm, the magnification is 2000, and the secondary electron emits signals. Such as image 3 As shown, it is an equiaxed dimple, and the size of the dimple is small, which is a ductile fracture.

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Abstract

The invention provides H13 steel with high strength, toughness and wear resistance and a smelting method thereof, and relates to the technical field of ferrous metallurgy. The smelting method comprises the following steps: S1, vacuumizing H13 hot work die steel in the later period of smelting; S2, adjusting the power for smelting; S3, stopping heating after full melting, and introducing shielding gas; S4, adding VN particles, adjusting the power, and stopping heating until VN is completely dissolved; S5, adding nitrogen-chromium-iron alloy, the adjusting the power, and stopping heating until the nitrogen-chromium-iron alloy is completely dissolved; and S6, performing casting in a furnace to form a steel ingot. According to the H13 steel and the smelting method thereof, the VN particles and the nitrogen-chromium-iron alloy are added in the later period of smelting so that the H13 steel has higher hardness, strength, impact toughness and wear resistance.

Description

【Technical field】 [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to H13 steel with high strength, toughness and wear resistance and a melting method thereof. 【Background technique】 [0002] Vanadium is one of the important elements in tool steel. Vanadium is mostly precipitated on the matrix and grain boundaries in the form of carbides, nitrides, and solid solution or composite carbonitrides formed by the two. The V(C, N) precipitates can pin dislocations and play a certain role in the grain boundary migration, thereby refining the martensitic lath and making the lath bundles shorter; and the carbonitride precipitates effectively hinder the deformation process The dislocation slips in it, thereby increasing the strength and reducing the plasticity and toughness, that is, V(C, N) plays a role in precipitation strengthening and grain refinement. V is rarely added to steel as a single element, and vanadium-iron alloy and vanadiu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/06C22C38/02C22C38/24C22C38/22
CPCC22C33/06C22C38/02C22C38/24C22C38/22C22C38/001
Inventor 孙烨郭汉杰郭靖常智吴刘柱黄振宇杨文晟李少英
Owner UNIV OF SCI & TECH BEIJING
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