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High-toughness free-cutting non-quenched and tempered round steel and manufacturing method thereof

A manufacturing method and non-quenching and tempering technology, applied in the field of steel and its manufacturing, can solve the problems of insufficient toughness and excessive hardness, and achieve the effects of loose process window, easy cutting, reasonable chemical composition and related process design

Active Publication Date: 2022-07-15
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the non-quenched and tempered steels in the prior art still have the problems of excess strength and hardness but insufficient toughness

Method used

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  • High-toughness free-cutting non-quenched and tempered round steel and manufacturing method thereof
  • High-toughness free-cutting non-quenched and tempered round steel and manufacturing method thereof
  • High-toughness free-cutting non-quenched and tempered round steel and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-6 and comparative example 1-4

[0063] The high-strength, tough, free-cutting, non-quenched and tempered round steels of Examples 1-6 are obtained by the following steps:

[0064] (1) Smelting and casting are carried out according to the chemical compositions shown in the following Tables 1-1 and 1-2: 50kg vacuum induction furnace or 150kg vacuum induction furnace can be used for smelting, or electric furnace smelting + out-of-furnace refining can be used for smelting + Smelting by vacuum degassing.

[0065] (2) Heating: control the heating temperature to be 1050~1250℃, and the holding time to be 3~24h.

[0066] (3) Forging or rolling: control the final rolling temperature or the final forging temperature ≥800℃; cool after rolling or forging, control the cooling rate ≤1.5℃ / s, and the cooling method can be air cooling or air cooling.

[0067] (4) Finishing, such as peeling.

[0068] It should be noted that, in the above-mentioned step (3), when forging is performed, it can be directly forged to the final prod...

Embodiment 1

[0070] Example 1: Smelting was carried out on a 50kg vacuum induction furnace according to the chemical compositions shown in Table 1-1 and Table 1-2 below. The molten steel is cast into ingots, heated and forged to open billets. The heating temperature is 1050 °C, and the forging is carried out after holding for 3 hours.

Embodiment 2

[0071] Example 2: Smelting was carried out on a 150kg vacuum induction furnace according to the chemical compositions shown in Table 1-1 and Table 1-2 below. The molten steel is cast into ingots, heated and forged to open billets, the heating temperature is 1100 ° C, and the forging is carried out after holding for 4 hours. The bar material is then air-cooled, and then turned and peeled to Φ90mm after air-cooling.

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Abstract

The invention discloses a high-strength and high-toughness free-cutting non-quenched and tempered round steel. The high-strength and high-toughness free-cutting non-quenched and tempered round steel further comprises the following chemical elements in percentage by mass besides Fe and inevitable impurities: 0.36 to 0.45 percent of C, 0.20 to 0.70 percent of Si, 1.25 to 1.85 percent of Mn, 0.15 to 0.55 percent of Cr, 0.10 to 0.25 percent of Ni, 0.10 to 0.25 percent of Mo, 0.02 to 0.05 percent of Al, 0.001 to 0.040 percent of Nb, 0.10 to 0.25 percent of V and 0.02 to 0.06 percent of S. Correspondingly, the invention also discloses a manufacturing method of the high-toughness free-cutting non-quenched and tempered round steel, which comprises the following steps: (1) smelting and casting; (2) heating; (3) forging or rolling, wherein the finish rolling temperature or the finish forging temperature is controlled to be larger than or equal to 800 DEG C; cooling after rolling or forging; and (4) finishing. The high-strength and high-toughness free-cutting non-quenched and tempered round steel has high strength, good impact toughness, ductility and percentage reduction of area, good cutting performance and anti-fatigue performance, and can be used for occasions needing high-strength steel such as automobiles and engineering machinery.

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] High-strength steel bars are usually used to manufacture high-safety mechanical and structural components, such as auto parts or key stress components of construction machinery. Therefore, high-strength steel not only needs to have high strength, but also has properties such as high strength, toughness, and easy cutting. [0003] In the prior art, an appropriate chemical composition is usually selected, and a quenching + tempering heat treatment or a controlled rolling + controlled cooling process is used to produce high-strength steel. Among them, using the quenching + tempering process to produce high-strength steel can improve the hardenability of the steel by optimizing the content of alloying elements and carbon elements, so that the steel can form a mart...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/58C22C38/44C22C38/48C22C38/46C22C38/60C22C38/42C21D8/06
CPCC22C38/02C22C38/04C22C38/06C22C38/58C22C38/44C22C38/48C22C38/46C22C38/60C22C38/42C21D8/065C21D2211/002C21D2211/005C21D2211/009C21D2211/001C22C38/002C22C38/50C21D9/0075C21D1/02C22C38/001C21D1/18C22C38/26C22C38/24
Inventor 高加强赵四新黄宗泽陈林
Owner BAOSHAN IRON & STEEL CO LTD
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