Hot continuous rolling process of high-sulfur (sulfur-phosphorus) free cutting structural steel

A production method and free-cutting technology, applied in heat treatment furnaces, metal rolling, heat treatment equipment, etc., can solve the problems of slippage and head cracking, long thermal shutdown time, low production efficiency, etc. at the same time, and reach the production specification range. Wide, avoid thermal shutdown, high production efficiency

Inactive Publication Date: 2005-04-27
宝钢特钢有限公司
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Hot rolling (deformation) of high-sulfur (sulfur-phosphorus) free-cutting structural steel (Mn/S≤5, even Mn/S≤3) has always been a difficult problem for rolling engineers (searching a large number of documents, no Mn/S Related technical reports on hot continuous rolling of high-sulfur phosphorus free-cutting structural steel with S≤5, no relevant technical data reports on hot continuous rolling of high-sulfur phosphorus free-cutting structural steel with Mn/S≤3 in foreign countries)
At present, the hot-workin

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0030] specific implementation plan

[0031] The steel rolling branch of a certain iron and steel company implements the patent of the invention. In the prestressed hot continuous rolling mill (32 stands), the high-sulfur phosphorus free-cutting structural steel (US brand: 1108, 1109, 1110, 1116, 1117, 1118, 1119, 1132, 1137, 1139, 1140, 1141, 1144, 1145, 1146, 1151, 1211, 1212, 1213, 1215; Japanese grades: SUM11, SUM12, SUM21, SUM22, SUM23, SUM25, SUM31, SUM32, SUM41, SUM42, SUM43 ; Chinese grades: Y12, Y15, Y20, Y30, Y35, Y75, Y40Mn; German grades: 9S20, 9SMn28, 9SMn36, 10S20, 35S20, 45S20, 60S20, etc. Hot billet, continuous casting cold billet, mold casting cold billet, diameter or side length is 90 ~ 220 mm; take 160 square meters, continuous casting hot billet as an example) hot rolling finished steel (rod, wire, specification Φ5 ~ 50 mm; Φ10mm wire as an example):

[0032] The first step, steel billet requirements: (1) hot billet (continuous casting red billet), the en...

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PUM

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Abstract

The present invention is hot continuous rolling process of high-sulfur (sulfur-phosphorus) easy-to-cut structural steel, and features that the billet is hot rolled into rod or wire by means of controlling billet heating, coarse rolling speed, area reduction and cooling water flow rate. The present invention solves the difficult problem of rolling easy-to-cut structural steel with high high-sulfur (sulfur-phosphorus) content without producing crack, and has high production efficiency, stable quality and high material utilization.

Description

technical field [0001] The invention relates to a thermal processing and rolling method of free-cutting structural steel in the metallurgical industry, in particular to a thermal processing and rolling method of high-sulfur (or sulfur-phosphorus composite) system easy-cutting structural steel. Background technique [0002] Structural steel is a common type of steel, mainly low-alloy structural steel and carbon structural steel. With the rapid development of the machinery and equipment manufacturing industry, higher requirements have been placed on the machining and cutting performance of structural steel (for example, in Japan, the cutting time of parts on the automatic production line can be saved by 1 second for every 1 second). Yuan.), that is, the ease of cutting of structural steel materials (the cutting cost is doubled, the product quality is greatly improved, and the production efficiency is doubled). In order to meet the easy-cutting requirements of metal materials ...

Claims

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Application Information

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IPC IPC(8): B21B1/00C21D9/70
Inventor 徐芗明胡俊辉杨伟宁郑雨旸林俊陈新建
Owner 宝钢特钢有限公司
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