On-line quenching production method of low-cost high-strength abrasion-resistant steel plate

Abstract

The invention relates to an on-line quenching production method of a low-cost high-strength abrasion-resistant steel plate, and belongs to the technical field of the production of abrasion-resistant steels. The on-line quenching production method comprises the following processing steps of: selecting a continuous casting blank which meets the requirements; carrying out general hot rolling, wherein the heating temperature is 1170-1200 DEG C, the start rolling temperature is 1050-1100 DEG C, the finish rolling temperature is 900-950 DEG C, and the water entry temperature is more than 880 DEG C; realizing the on-line quenching of the steel plate by utilizing a UFC+ACC cooling mode, wherein the average speed of a cooling zone is not lower than 25 DEG C / S, and the quenching is finished when the temperature is reduced to 150-250 DEG C; and heating the quenched steel plate to 250-400 DEG C, wherein the heat preserving time is 1-2 hours. The on-line quenching production method disclosed by the invention overcomes the defects of long period, high cost, and the like of the conventional hardening and tempering heat treatment production mode, realizes the short production flow, the low energy consumption and the low cost, can be used for stably producing high-strength high-toughness abrasion-resistant steel plate with the specification of 6-30 mm, the surface hardness more than or equal to HB360 and the -20 DEG C impact work mean more than or equal to 60 J and is widely applied to mine, engineering, agriculture and railway transportation machinery products which have high requirements for steel type properties.

Description

technical field

[0001] The invention belongs to the technical field of production of high-strength wear-resistant steel plates, in particular to an on-line quenching production method of low-cost high-strength wear-resistant steel plates. Background technique

[0002] As an important steel material, low-alloy high-strength wear-resistant steel is widely used in mining machinery, engineering machinery, agricultural machinery and railway transportation. With the rapid development of my country's industry, the complexity, large-scale and lightweight of various mechanical equipment have put forward higher requirements for this type of steel, that is, the low-alloy high-strength wear-resistant steel plate used to manufacture these equipment not only requires more High hardness, strength, but also requires good toughness and welding performance. In recent decades, the development and application of high-strength wear-resistant steel has developed rapidly. This type of steel is de...

Examples

Embodiment 1

[0025] Low-cost high-strength wear-resistant steel plate, thickness 16mm:

[0026] 1) Billet selection: The chemical composition of the cast billet is: C 0.16%, Si 0.31%, Mn 1.45%, P ≤0.015%, S ≤0.008%, Cr 0.31%, Al 0.037%, Ti 0.016%, B 0.0017% , the rest is iron Fe and unavoidable impurities;

[0027] 2) Rolling process: the billet heating temperature is 1190°C, the rolling start temperature is 1070°C, the final rolling temperature is 945°C, and the water entry temperature is 910°C;

[0028] 3) On-line quenching process: the average rate in the cooling zone is 40°C / S, and the cooling termination temperature is 200°C;

[0029] 4) Tempering process: the tempering temperature is 350°C, and the holding time is 1 hour.

[0030] Through the above process, the mechanical properties of the wear-resistant steel plate are as follows: the tensile strength is 1300MPa, the elongation is 14.5%, the average impact energy at -20°C is 80J, and the average surface Brinell hardness is HB 395....

Embodiment 2

[0032] Low-cost high-strength wear-resistant steel plate, thickness 25mm:

[0033] 1) Billet selection: The chemical composition of the cast billet is: C 0.17%, Si 0.30%, Mn 1.42%, P ≤0.015%, S ≤0.008%, Cr 0.43%, Al 0.035%, Ti 0.015%, B 0.0018% , the rest is iron Fe and unavoidable impurities;

[0034] 2) Rolling process: the billet heating temperature is 1195°C, the rolling start temperature is 1060°C, the final rolling temperature is 940°C, and the water entry temperature is 915°C;

[0035] 3) On-line quenching process: the average rate in the cooling zone is 38°C / S, and the cooling termination temperature is 210°C;

[0036] 4) Tempering process: the tempering temperature is 350°C, and the holding time is 1 hour.

[0037] Through the above process, the mechanical properties of the wear-resistant steel plate are as follows: the tensile strength is 1250MPa, the elongation is 12.5%, the average impact energy at -20°C is 75J, and the average surface Brinell hardness is HB 385....

Embodiment 3

[0039] Low-cost high-strength wear-resistant steel plate, thickness 30mm:

[0040] 1) Billet selection: The chemical composition of the cast billet is: C 0.18%, Si 0.31%, Mn 1.48%, P ≤0.015%, S ≤0.008%, Cr 0.45%, Al 0.034%, Ti 0.014%, B 0.0016% , the rest is iron Fe and unavoidable impurities;

[0041] 2) Rolling process: the billet heating temperature is 1198°C, the rolling start temperature is 1065°C, the final rolling temperature is 935°C, and the water entry temperature is 920°C;

[0042] 3) On-line quenching process: the average rate in the cooling zone is 30°C / S, and the cooling termination temperature is 190°C;

[0043] 4) Tempering process: the tempering temperature is 400°C, and the holding time is 1.5 hours.

[0044] Through the above process, the mechanical properties of the wear-resistant steel plate are as follows: the tensile strength is 1230MPa, the elongation is 15.5%, the average impact energy at -20°C is 70J, and the average surface Brinell hardness is HB 380...

technical field

[0001] The invention belongs to the technical field of production of high-strength wear-resistant steel plates, in particular to an on-line quenching production method of low-cost high-strength wear-resistant steel plates. Background technique

[0002] As an important steel material, low-alloy high-strength wear-resistant steel is widely used in mining machinery, engineering machinery, agricultural machinery and railway transportation. With the rapid development of my country's industry, the complexity, large-scale and lightweight of various mechanical equipment have put forward higher requirements for this type of steel, that is, the low-alloy high-strength wear-resistant steel plate used to manufacture these equipment not only requires more High hardness, strength, but also requires good toughness and welding performance. In recent decades, the development and application of high-strength wear-resistant steel has developed rapidly. This type of steel is de...

Examples

Embodiment 1

[0025] Low-cost high-strength wear-resistant steel plate, thickness 16mm:

[0026] 1) Billet selection: The chemical composition of the cast billet is: C 0.16%, Si 0.31%, Mn 1.45%, P ≤0.015%, S ≤0.008%, Cr 0.31%, Al 0.037%, Ti 0.016%, B 0.0017% , the rest is iron Fe and unavoidable impurities;

[0027] 2) Rolling process: the billet heating temperature is 1190°C, the rolling start temperature is 1070°C, the final rolling temperature is 945°C, and the water entry temperature is 910°C;

[0028] 3) On-line quenching process: the average rate in the cooling zone is 40°C / S, and the cooling termination temperature is 200°C;

[0029] 4) Tempering process: the tempering temperature is 350°C, and the holding time is 1 hour.

[0030] Through the above process, the mechanical properties of the wear-resistant steel plate are as follows: the tensile strength is 1300MPa, the elongation is 14.5%, the average impact energy at -20°C is 80J, and the average surface Brinell hardness is HB 395....

Embodiment 2

[0032] Low-cost high-strength wear-resistant steel plate, thickness 25mm:

[0033] 1) Billet selection: The chemical composition of the cast billet is: C 0.17%, Si 0.30%, Mn 1.42%, P ≤0.015%, S ≤0.008%, Cr 0.43%, Al 0.035%, Ti 0.015%, B 0.0018% , the rest is iron Fe and unavoidable impurities;

[0034] 2) Rolling process: the billet heating temperature is 1195°C, the rolling start temperature is 1060°C, the final rolling temperature is 940°C, and the water entry temperature is 915°C;

[0035] 3) On-line quenching process: the average rate in the cooling zone is 38°C / S, and the cooling termination temperature is 210°C;

[0036] 4) Tempering process: the tempering temperature is 350°C, and the holding time is 1 hour.

[0037] Through the above process, the mechanical properties of the wear-resistant steel plate are as follows: the tensile strength is 1250MPa, the elongation is 12.5%, the average impact energy at -20°C is 75J, and the average surface Brinell hardness is HB 385....

Embodiment 3

[0039] Low-cost high-strength wear-resistant steel plate, thickness 30mm:

[0040] 1) Billet selection: The chemical composition of the cast billet is: C 0.18%, Si 0.31%, Mn 1.48%, P ≤0.015%, S ≤0.008%, Cr 0.45%, Al 0.034%, Ti 0.014%, B 0.0016% , the rest is iron Fe and unavoidable impurities;

[0041] 2) Rolling process: the billet heating temperature is 1198°C, the rolling start temperature is 1065°C, the final rolling temperature is 935°C, and the water entry temperature is 920°C;

[0042] 3) On-line quenching process: the average rate in the cooling zone is 30°C / S, and the cooling termination temperature is 190°C;

[0043] 4) Tempering process: the tempering temperature is 400°C, and the holding time is 1.5 hours.

[0044] Through the above process, the mechanical properties of the wear-resistant steel plate are as follows: the tensile strength is 1230MPa, the elongation is 15.5%, the average impact energy at -20°C is 70J, and the average surface Brinell hardness is HB 380...