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Production method of low-carbon free-cutting steel

A technology of free-cutting steel and production methods, applied in workpiece surface treatment equipment, metal rolling, manufacturing tools, etc., can solve problems such as roll wrapping and slipping, difficult operation, head cracking, etc., to avoid pulling cracks, mechanics The effect of uniform performance and uniform structure

Inactive Publication Date: 2009-04-29
HUNAN VALIN XIANGTAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are few studies on the smelting of sulfur-based free-cutting steel wire rods, the distribution of internal inclusions, the hot-working plasticity and the rolling process in the existing technologies, and the existing technologies are generally prone to head cracking, roll entanglement and Problems such as slippage, difficulty in biting, and difficult operation

Method used

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  • Production method of low-carbon free-cutting steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0015] Examples of the present invention are shown in Table 1, Table 2 and Table 3. Table 1 is the low-carbon free-cutting steel production process and its detection performance of the φ8.0mm specification produced by the process of the present invention, including 3 examples; Table 2 is the lead-free environmental protection type of the φ17.0mm specification produced by the process of the present invention Low-carbon free-cutting steel wire rod and its detection performance, including 3 embodiments; Table 3 is the lead-free environment-friendly low-carbon free-cutting steel wire rod and its detection performance of the φ32.0mm specification produced by the process of the present invention, including 3 an example.

[0016] Table 1 Production process and testing performance of φ8.0mm free-cutting steel wire rod

[0017] Preface

No

one plus

temperature

℃ two plus

temperature

℃ Soaking

Duan Wen

degree ℃ open rolling

tem...

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Abstract

The invention provides a production method of low-carbon free-cutting steel and is characterized in that when the free-cutting steel is rolled, the range of sensitive temperature of sulfide embrittlement is escaped in the heating temperature; the first heating temperature of a heating furnace of steel billets is 1050 to 1150 DEG C, the second heating temperature is 1150 to 1250 DEG C, the holding zone is provided with the temperature of 1180 to 1240 DEG C, the initial rolling temperature is 1120 to 1150 DEG C the spinning temperature is 860 to 900 DEG C and the time in the furnace is controlled to be equal to or more than 130 minutes; and delayed cooling is adopted and both a fan and a heat holding cover are shut down. The invention solves the phenomena of easy head cracking, collaring and slipping, difficult gripping, great operational difficulty, and the like in the rolling of S-system free-cutting steel, and has good cutting and processing performance.

Description

technical field [0001] The invention relates to a production method of low-carbon free-cutting steel. technical background [0002] With the growth of the national economy, the number of automatic machine tools has increased rapidly, and its application range has also expanded. Due to the adoption of new cutting tools and new cutting technology, the cutting speed has been greatly increased. At the same time, the requirements for the surface roughness and precision of each machined part are more stringent, and the material of the machined part is required to have better machinability. Therefore, free-cutting steel demand is also increasing. In recent years, the international steel industry is competing to produce free-cutting steel with better cutting performance while improving the physical and chemical properties of steel. Free-cutting steel wire rods can be cut into different sizes at will after drawing, which is better in cost saving, so it is more widely used and more ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P17/00C21D7/13B21B37/74B21B45/02
Inventor 田树生吴俊雄夏政海罗登周小利徐瑞军刘建
Owner HUNAN VALIN XIANGTAN IRON & STEEL CO LTD
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