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Free-cutting hot-rolled steel strip for key and preparation method of free-cutting hot-rolled steel strip

An easy-cutting and steel strip technology, applied in the direction of metal rolling, etc., can solve the problems of increasing the cost of processing procedures, reducing the yield of finished products, edge cracking, etc., and achieve the effect of increasing processing difficulty, improving quality, and being easy to break

Inactive Publication Date: 2021-12-24
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to this technical plan, the product can meet the user's easy cutting performance during key manufacturing and key processing, as well as the strength and hardness required by the key. However, in actual production, this kind of hot-rolled steel strip often has edge cracking problems, which can only Take edge-cutting measures to remedy
This not only greatly reduces the finished product rate, but also increases the cost of processing procedures, resulting in waste of resources

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The free-cutting hot-rolled steel strip for keys provided in this embodiment has a thickness of 2.8mm and a width of 150mm. Its chemical composition and mass percentage are as follows: C: 0.05%, Mn: 1.52%, Si: 0.01%, P: 0.045%, S: 0.30%, Pb: 0.001%, and the balance is iron and unavoidable impurities, of which Mn The mass ratio to S is 5.1.

[0021] The preparation method comprises the following steps:

[0022] (1) The molten steel is 150*150mm obtained through smelting, LF refining and continuous casting process 2 billet;

[0023] (2) The slab adopts the push-type heating method. Before the slab is heated by push-type heating, first check whether the slab is free of defects, and then proceed to push-type heating. The temperature in the preheating section is 653°C, and the temperature in the heating section is 1238°C. The temperature in the soaking section is 1192°C, and the heating time is 4.0h;

[0024] (3) Rough descaling is performed on the heated billet first, a...

Embodiment 2

[0030] A free-cutting hot-rolled steel strip for keys provided in this embodiment has a thickness of 3.75mm and a width of 172mm. Its chemical composition and mass percentage are as follows: C: 0.06%, Mn: 1.47%, Si: 0.02%, P: 0.046%, S: 0.31%, Pb: 0.001%, and the balance is iron and unavoidable impurities, of which Mn The mass ratio to S is 4.7.

[0031] The preparation method comprises the following steps:

[0032] (1) The molten steel is 150*150mm obtained through smelting, LF refining and continuous casting process 2 billet;

[0033] (2) The slab adopts the push-type heating method. Before the slab push-type heating, first check whether the slab is free of defects, and then carry out push-type heating after detecting no defects. The temperature in the preheating section is 702°C, and the temperature in the heating section is 1256°C. The temperature in the soaking section is 1201°C, and the heating time is 4.0h;

[0034] (3) Roughly descale the heated slab, and then carr...

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Abstract

The invention discloses a free-cutting hot rolled steel strip for a key, and relates to the technical field of steel production. The free-cutting hot rolled steel strip comprises the following chemical components of, in percentage by mass, 97.57%-98.26% of Fe, 0%-0.09% of C, 1.45%-1.60% of Mn, 0%-0.07% of Si, 0.040%-0.090% of P, 0.25%-0.37% of S, 0%-0.010% of Pb and 0%-0.20% of inevitable impurities, and the mass ratio of Mn to S is greater than or equal to 4.0. Analyzing is carried out on the reason for cracking of the edge part of the free-cutting hot rolled steel strip, it is found that chemical components, the machining process, especially the mass ratio of Mn to S in the components, the finish rolling temperature and the curling temperature have great influences on the free-cutting hot rolled steel strip; and therefore, through reasonable design, effective components and process parameters, the hot-rolled edge of the free-cutting steel strip for the key is free of cracking.

Description

technical field [0001] The invention relates to the technical field of steel production, in particular to a free-cutting hot-rolled steel strip for keys and a preparation method thereof. Background technique [0002] The metal material used to make keys must have certain strength, hardness, and good cutting performance. Common materials include copper strips and steel strips. At present, due to the scarcity of copper resources and high manufacturing costs, steel strips are generally used as metal materials for keys. [0003] The invention patent with the publication number CN 104451458A discloses a free-cutting steel and its production method in the production of keys, which is composed of the following chemical components in mass percentages: Fe 97.85-98.53%; C 0-0.09%; Si 0 -0.15%; Mn 1.10-1.40%; P 0.04-0.09%; S 0.33-0.42%; impurities 0-0.2%; the mass ratio of Mn to S is 3.6-4.2:1; Refining, continuous casting, strip rolling. According to this technical plan, the produc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/60C22C33/04B21B1/22B21C37/02
CPCC22C38/004C22C38/02C22C38/04C22C38/002C22C38/60C22C33/04B21C37/02B21B1/22B21B2001/225
Inventor 王晗谢海平
Owner NANJING IRON & STEEL CO LTD
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