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Free-cutting medium-carbon non-quenching and tempering steel for fracture splitting connecting rod and manufacturing method thereof

A technology of cracking connecting rod and manufacturing method, applied in the field of steel materials and their manufacturing, can solve problems such as increasing the difficulty of smelting steel, achieve the effects of improving structure and grain size, good fatigue performance, and improving breaking performance

Inactive Publication Date: 2015-12-16
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the steel grades in this patent document strictly limit the B element to 0.0005-0.006%, thus greatly increasing the difficulty of smelting the steel grades

Method used

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  • Free-cutting medium-carbon non-quenching and tempering steel for fracture splitting connecting rod and manufacturing method thereof
  • Free-cutting medium-carbon non-quenching and tempering steel for fracture splitting connecting rod and manufacturing method thereof
  • Free-cutting medium-carbon non-quenching and tempering steel for fracture splitting connecting rod and manufacturing method thereof

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Embodiment A1-A5

[0050] Manufacture the free-cutting medium carbon non-quenched and tempered cracking connecting rod steel in the embodiments of the present invention A1-A5 according to the following steps:

[0051] 1) Smelting: Refining outside the furnace after smelting in an electric furnace, and then undergoing vacuum degassing treatment to control the mass percentage of each chemical element as shown in Table 1;

[0052] 2) Continuous casting: continuous casting into billets, and control the superheat of the tundish at 15-40°C;

[0053] 3) Heating: using a walking heating furnace for heating. The heating process includes heating in the preheating section, heating in the first heating section, heating in the second heating section and soaking in the soaking section. The heating temperature in the preheating section is 750 ~850℃, the heating temperature of the first heating section is 960~1060℃, the heating temperature of the second heating section is 1050~1200℃, the soaking temperature of ...

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Abstract

The invention discloses free-cutting medium-carbon non-quenching and tempering steel for a fracture splitting connecting rod. The microstructure of the free-cutting medium-carbon non-quenching and tempering steel comprises ferrite and pearlite; the free-cutting medium-carbon non-quenching and tempering steel for a fracture splitting connecting rod comprises chemical elements according to mass percents: 0.2-0.55 % of C, 0.35-1.00 % of Si, 0.5-1.70 % of Mn, 0.01-0.09 % of S, 0.03-0.15 % of P, 0.05-0.50 % of Cr, 0.05-0.45 % of V, 0.005-0.030% of N, and the balance Fe and other inevitable impurities. The free-cutting medium-carbon non-quenching and tempering steel for a fracture splitting connecting rod has relatively high intensity; in addition, the steel material disclosed by the invention has excellent cutting machinability and good brittleness splitting decomposition performance, and is suitable for a connecting rod processing technology.

Description

technical field [0001] The invention relates to a steel material and a manufacturing method thereof, in particular to a non-quenched and tempered steel and a manufacturing method thereof. Background technique [0002] Microalloyed non-quenched and tempered steel (hereinafter referred to as non-quenched and tempered steel) is an energy-saving structural material that combines rolling or forging and heat treatment steps, which can save quenching and tempering treatment. Compared with traditional quenched and tempered steel, microalloyed non-quenched and tempered steel is a kind of steel with high technical content, strong driving force and large influence area, and it is also a cutting-edge hot material that is currently in the stage of rapid development in the world. The engine connecting rod is generally made of medium carbon steel or medium carbon alloy steel after heat treatment such as quenching and tempering treatment. With the development of automobile industry and mat...

Claims

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Application Information

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IPC IPC(8): C22C38/24C21D8/00
Inventor 丁毅覃明安金敏
Owner BAOSHAN IRON & STEEL CO LTD
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