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High-strength high-toughness medium and large-diameter non-quenched-and-tempered steel for direct cutting and production process thereof

A high-strength toughness, non-quenched and tempered steel technology, applied in the direction of manufacturing tools, metal processing equipment, workpiece surface treatment equipment, etc., can solve the problems of environmental pollution, steel oxidation, increased energy consumption, etc., to promote diffusion and prevent austenite Effect of grain growth and cost reduction

Active Publication Date: 2021-07-16
JIANGSU YONGGANG GROUP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the materials used in injection molding machines on the market are mainly 42CrMo and 4145H alloy structural steel after quenching and tempering. Due to the increased energy consumption and environmental pollution during the quenching and tempering process of parts, at the same time, the steel has defects such as oxidation, decarburization, deformation, and cracking.

Method used

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  • High-strength high-toughness medium and large-diameter non-quenched-and-tempered steel for direct cutting and production process thereof
  • High-strength high-toughness medium and large-diameter non-quenched-and-tempered steel for direct cutting and production process thereof
  • High-strength high-toughness medium and large-diameter non-quenched-and-tempered steel for direct cutting and production process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036]The diameter of the round steel involved in this embodiment is 140mm, and its chemical composition is calculated by mass percentage: C: 0.42%, Si: 0.58%, Mn: 1.40%, P: 0.011%, S: 0.003%, Cr: 0.18%, V: 0.09%, Nb: 0.022%, Ti: 0.014%, Ni: 0.014%, Mo: 0.011%, Al: 0.013%, Cu: 0.017%, N: 155ppm, H: 1.0ppm, O: 17ppm; balance It is Fe and unavoidable impurities.

[0037] (1) Mix the materials according to the ingredients, after smelting, after smelting, the molten steel is cast into a P500 continuous casting round billet with a superheat of 18-35 °C for the whole process, and the continuous casting billet is ≥500 °C and enters the pit for slow cooling for ≥36 hours; The cast round billet enters the walking beam heating furnace for heating, and is heated in three stages of preheating section, heating section and soaking section. °C, the heating time in the soaking section is 3h; finally the heated billet is obtained;

[0038] (2) After the steel billet is descaled by high-press...

Embodiment 2

[0045] The diameter of the round steel involved in this embodiment is 110mm, and its chemical composition is calculated by mass percentage: C: 0.42%, Si: 0.60%, Mn: 1.44%, P: 0.010%, S: 0.003%, Cr: 0.17%, V: 0.10%, Nb: 0.023%, Ti: 0.012%, Ni: 0.016%, Mo: 0.003%, Al: 0.013%, Cu: 0.020%, N: 149ppm, H: 1.0ppm, O: 20ppm; balance It is Fe and unavoidable impurities.

[0046] (1) Mix the materials according to the ingredients, after smelting, after smelting, the molten steel is cast into a P500 continuous casting round billet with a superheat of 18-35 °C for the whole process, and the continuous casting billet is ≥500 °C and enters the pit for slow cooling for ≥36 hours; The cast round billet enters the walking beam heating furnace for heating, and is heated in three stages of preheating section, heating section and soaking section. At 1240°C, the heating time in the soaking section is 3h; finally the heated billet is obtained;

[0047] (2) After the steel billet is descaled by hi...

Embodiment 3

[0054] The diameter of the round steel involved in this embodiment is 80mm, and its chemical composition is calculated by mass percentage: C: 0.42%, Si: 0.57%, Mn: 1.40%, P: 0.014%, S: 0.004%, Cr: 0.16%, V: 0.09%, Nb: 0.018%, Ti: 0.014%, Ni: 0.013%, Mo: 0.010%, Al: 0.014%, Cu: 0.015%, N: 157ppm, H: 0.8ppm, O: 17ppm; balance It is Fe and unavoidable impurities.

[0055] (1) Mix the materials according to the ingredients, after smelting, after smelting, the molten steel is cast into a P500 continuous casting round billet with a superheat of 18-35 °C for the whole process, and the continuous casting billet is ≥500 °C and enters the pit for slow cooling for ≥36 hours; The cast round billet enters the walking beam heating furnace for heating, and is heated in three stages: preheating section, heating section, and soaking section. 1240°C, the heating time in the soaking section is 2h; finally the heated billet is obtained;

[0056] (2) After the steel billet is descaled by high-pr...

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Abstract

The invention belongs to the technical field of non-quenched-and-tempered steel, and relates to high-strength high-toughness medium and large-diameter non-quenched-and-tempered steel for direct cutting and a production process thereof. The steel comprises the following components of 0.38 to 0.45 % of C, 0.50 to 0.70 % of Si, 1.20 to 1.60 % of Mn, not larger than 0.020 % of P, not larger than 0.035 % of S, 0.10 to 0.20 % of Cr, 0.08 to 0.18 % of V, 0.010 to 0.030 % of Nb, 0.010 to 0.030 % of Ti, not larger than 0.025 % of Ni, not larger than 0.015 % of Mo, not larger than 0.030 % of Al, not larger than 0.2 % of Cu, 130 to 200ppm of N, less than or equal to 2.0 ppm of H, less than or equal to 20ppm of O and the balance Fe and inevitable impurities. By optimizing the components, increasing the silicon content, and combining the semi-continuous rolling technology to achieve a controlled rolling and controlled cooling process, finally the medium and large-diameter non-quenched-and-tempered steel which is excellent in performance and used for direct cutting is obtained.

Description

technical field [0001] The invention belongs to the technical field of non-quenched and tempered steel, and in particular relates to a high-strength toughness non-quenched and tempered steel for direct cutting of medium and large diameters and a production process thereof. Background technique [0002] "GB / T 15712 Non-Quenched and Tempered Mechanical Structural Steel" only puts forward clear mechanical property requirements for non-tempered steel for direct cutting below Φ60mm, while the mechanical properties of steel above Φ60mm are determined through negotiation between users and suppliers. As people pay more and more attention to environmental protection, processing cost, processing cycle and material stability, they urgently hope that the cutting rods used in the machining industry, such as injection molding machine tie rods, mechanical cylinder piston rod parts and other large sizes (diameter Φ75 ~ 140mm) Non-quenched and tempered steel for direct cutting is used instea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C33/04B21B1/18B21B37/74B21B45/02
CPCC22C38/02C22C38/04C22C38/002C22C38/46C22C38/48C22C38/50C22C38/44C22C38/06C22C38/42C22C38/001C22C33/04B21B1/18B21B45/0224B21B37/74
Inventor 高华耀刘栋林江宏亮葛建宏周湛孙智伟曹剑山
Owner JIANGSU YONGGANG GROUP CO LTD
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