Unlock instant, AI-driven research and patent intelligence for your innovation.

A heating method for controlling high-temperature vulcanization defects on the surface of free-cutting steel

A technology of high-temperature vulcanization and heating method, which is applied in the field of steel rolling, and can solve the problems of alloy steel heating surface defects, low calorific value of gas medium, unstable heat storage temperature, etc.

Active Publication Date: 2019-02-22
SHOUGANG CORPORATION
View PDF8 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the heating furnaces in the high-speed wire plant adopt the heating method of heat storage type and simple flat flame type. Influenced by the low calorific value of the gas medium, the residual oxygen control of the heating furnace is relatively high, which can easily lead to the heating surface defects of alloy steel

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A heating method for controlling high-temperature vulcanization defects on the surface of free-cutting steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 1, the present invention develops 12mm free-cutting steel 12L14 and obtains application in the easy-cutting steel wire rod, proposes a kind of heating process method that controls the high-temperature vulcanization defect of free-cutting steel surface, and process step is as follows:

[0036] (1) It is produced by continuous casting of 150 square billets, and the heating process of the heating furnace is controlled: the heating temperature in the preheating section is controlled at 850-900°C, and the heating time is 20min; the temperature in the heating section is controlled at 1000-1050°C, and the heating time is 20min; The temperature of the section is controlled at 1150-1200°C, and the heating time is 30 minutes; the temperature of the soaking section is controlled at 1200-1250°C, and the heating time is 20 minutes.

[0037] (2) The heating furnace adopts a simple flat flame method to control the gas combustion efficiency of the heating furnace. It adopts air and gas ...

Embodiment 2

[0041] The present invention is applied in the development of 30mm free-cutting steel 12L14 free-cutting steel bars, and proposes a heating process method for controlling high-temperature vulcanization defects on the surface of free-cutting steel. The process steps are as follows:

[0042] (1) It is produced by continuous casting of 200 square billets, and the heating process of the heating furnace is controlled: the heating temperature of the preheating section is controlled at 850-900°C, and the heating time is 30min; the temperature of the heating section is controlled at 1050-1100°C, and the heating time is 30min; The temperature of the section is controlled at 1200-1250°C, and the heating time is 40 minutes; the temperature of the soaking section is controlled at 1200-1250°C, and the heating time is 30 minutes.

[0043] (2) The heating furnace adopts a simple flat flame method to control the gas combustion efficiency of the heating furnace. It adopts air and gas double pre...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
melting pointaaaaaaaaaa
Login to View More

Abstract

The invention discloses a heating method for controlling the surface high-temperature vulcanization defect of free-cutting steel and belongs to the technical field of steel rolling. The heating method comprises the technical steps that a 150mm*150mm continuous cast square billet and a 200mm*200mm continuous cast square billet are adopted for production, and the heating process of a heating furnace is controlled; the heating furnace adopts a flat flame mode; the mass of a fuel gas medium is controlled; and the water content of fuel gas is controlled to 5-8 g / m<3>, wherein as for the heating process of the heating furnace, in the preheating stage, the heating temperature is controlled to be 850-900 DEG C, and the heating time is 20-30 min; in the first heating stage, the temperature is controlled to be 1000-1100 DEG C, and the heating time is 20-30 min; in the second heating stage, the temperature is controlled to be 1150-1250 DEG C, and the heating time is 30-40 min; and in the soaking stage, the temperature is controlled to be 1200-1250 DEG C, and the heating time is 20-30 min. The heating method has the advantages that requirements are provided for a steel billet heating tool, the method is suitable for development of free-cutting steel wire rods and bars in a high-line production workshop, and the 12L14 surface defect rate of the free-cutting steel is lowered to be below 1%.

Description

technical field [0001] The invention belongs to the technical field of steel rolling, and in particular provides a heating method for controlling the high-temperature vulcanization defects on the surface of easy-cut steel, which puts forward requirements for the heating tooling of steel billets, and is suitable for the development of easy-cut steel wire rods and bars in high-wire production workshops. Improve the surface quality of materials to meet the needs of high-end users. Background technique [0002] Surface quality has always been the top priority in the development of long products. Good surface quality is the threshold for wire products to enter the mid-to-high-end market. It is also important for the surface quality of free-cutting steel. On the one hand, users want to reduce the broken wire rate in the drawing process. On the other hand, the qualification rate of the steel wire must be guaranteed, and there are strict requirements on the dimensional accuracy, ell...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/52C21D9/52
CPCC21D1/52C21D9/525
Inventor 王猛陈涛孙齐松李舒笳马跃罗志俊徐士新柳洋波陈卫平杨接明刘厚权
Owner SHOUGANG CORPORATION