A kind of 80mm large-thickness high-toughness low-alloy wear-resistant steel plate and its manufacturing method

A technology of wear-resistant steel plate and manufacturing method, which is applied in the field of wear-resistant steel manufacturing, can solve the problems of low-alloy wear-resistant steel, poor wear-resistant performance, and low impact toughness of low-alloy wear-resistant steel, and achieve improved wear-resistant performance and low temperature Good impact toughness and cold-bending performance, and overall uniform steel temperature

CN109280850BActive Publication Date: 2020-09-25NANJING IRON & STEEL CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2020-09-25

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Abstract

The present invention is a kind of 80mm large thickness high toughness low alloy wear-resistant steel plate and its manufacturing method. S≤0.002%, Cr0.90‑1.20%, Mo0.20‑0.40%, Ni0.50‑0.80%, Ti0.008‑0.030%, Nb0.01‑0.050%, V≤0.030%, B0.0008‑0.0025 %, Alt: 0.02‑0.06%, N≤0.0040%, H≤0.0002%, and the rest are Fe and unavoidable impurities. Manufacturing methods include: hot metal desulfurization pretreatment-converter smelting-LF+RH refining-continuous casting-slab stacking slow cooling-slab inspection-slab judgment-slab acceptance-slab heating-phosphorus removal-rolling-air cooling ‑Flaw detection‑Shot blasting‑Quenching‑Tempering‑Straightening‑Cutting, sampling‑Spray printing marks‑Inspection‑Storage. According to the invention, the surface Brinell hardness of the steel plate is greater than 400HB, the core part Brinell hardness is greater than 330HB, and the low-temperature impact energy at -40°C is greater than or equal to 20J.
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Description

technical field

[0001] The invention relates to the field of wear-resistant steel manufacture, and relates to a large-thickness wear-resistant steel plate and a manufacturing method thereof, in particular to an 80mm thick high-toughness low-alloy wear-resistant steel plate and a manufacturing method thereof. Background technique

[0002] Low alloy wear-resistant steel is widely used in engineering, mining, construction, agriculture, cement, port, electric power and metallurgy and other mechanical equipment manufacturing under harsh working conditions, such as bulldozers, loaders, excavators, dump trucks, ball mills and various mining machinery , grab bucket, stacker reclaimer, feeding bending structure, etc. Such parts generally work in the extremely harsh environment of dry and wet, and are difficult to replace. The steel plate is required to have high strength, hardness, excellent wear resistance and corrosion resistance, good low temperature toughness and good welding per...

Examples

Embodiment 1

[0021] This embodiment is an 80mm large thickness high toughness low alloy wear-resistant steel plate, which includes the following components by weight percentage: C: 0.18%, Si: 0.20%, Mn: 1.20%, P≤0.012%, S≤0.0015 %, Cr: 1.20%, Mo: 0.20%, Ni: 0.50%, Ti: 0.008%, Nb: 0.01%, V≤0.030%, B: 0.0008%, Alt: 0.035%, N≤0.0040%, H≤0.0002 %, the rest is Fe and unavoidable impurities.

[0022] The manufacturing method of the 80mm large thickness, high toughness and low alloy wear-resistant steel plate of this embodiment includes the following process: hot metal desulfurization pretreatment-converter smelting-LF+RH refining-continuous casting-slab stacking slow cooling-slab inspection-casting Billet acceptance - billet heating - dephosphorization - rolling - air cooling - flaw detection - shot blasting - quenching - tempering - straightening - cutting, sampling - printing marks - inspection - storage;

[0023] The steel components are smelted according to the required ratio, and the molte...

Embodiment 2

[0027] This embodiment is an 80mm large thickness high toughness low alloy wear-resistant steel plate, which includes the following components by weight percentage: C: 0.19%, Si: 0.30%, Mn: 1.10%, P≤0.012%, S≤0.0015 %, Cr: 1.10%, Mo: 0.32%, Ni: 0.70%, Ti: 0.013%, Nb: 0.013%, V≤0.030%, B: 0.0013%, Alt: 0.040%, N≤0.0040%, H≤0.0002 %, the balance is Fe and unavoidable impurities.

[0028] The manufacturing method of the 80mm large thickness, high toughness and low alloy wear-resistant steel plate of this embodiment includes the following process: hot metal desulfurization pretreatment-converter smelting-LF+RH refining-continuous casting-slab stacking slow cooling-slab inspection-casting Billet acceptance - billet heating - dephosphorization - rolling - air cooling - flaw detection - shot blasting - quenching - tempering - straightening - cutting, sampling - printing marks - inspection - storage;

[0029] The steel components are smelted according to the required ratio, and the m...

Embodiment 3

[0033]This embodiment is an 80mm large thickness high toughness low alloy wear-resistant steel plate, which includes the following components by weight percentage: C: 0.20%, Si: 0.40%, Mn: 0.90%, P≤0.012%, S≤0.0015 %, Cr: 0.90%, Mo: 0.40%, Ni: 0.80%, Ti: 0.030%, Nb: 0.050%, V≤0.030%, B: 0.0025%, Alt: 0.035%, N≤0.0040%, H≤0.0002 %, the rest is Fe and unavoidable impurities.

[0034] The manufacturing method of the 80mm large thickness, high toughness and low alloy wear-resistant steel plate of this embodiment includes the following process: hot metal desulfurization pretreatment-converter smelting-LF+RH refining-continuous casting-slab stacking slow cooling-slab inspection-casting Billet acceptance - billet heating - dephosphorization - rolling - air cooling - flaw detection - shot blasting - quenching - tempering - straightening - cutting, sampling - printing marks - inspection - storage;

[0035] The steel components are smelted according to the required ratio, and the molte...