High-efficiency production process capable of improving surface accuracy of cold-drawn seamless steel tube

A seamless steel pipe and surface precision technology, applied in manufacturing tools, heat treatment equipment, furnaces, etc., can solve the problems of excessive temperature increase, intense reaction, tube blank damage, etc., to ensure accuracy, safe and convenient use, and improve surface accuracy. Effect

Inactive Publication Date: 2013-03-13
浙江新纪元管业科技有限公司
View PDF6 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the addition of ferrous nitric acid, the reaction during pickling is too intense, whic...

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
  • High-efficiency production process capable of improving surface accuracy of cold-drawn seamless steel tube

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] In this embodiment, the steel pipe is made of German standard E355 material.

[0027] An efficient production process to improve the surface precision of cold-drawn seamless steel pipes includes the following steps:

[0028] 1) Heat treatment, the steel pipe is sent into a heat treatment furnace, heat treated at 900 degrees Celsius, and then heat preservation treatment, the heat preservation time is twice the thickness of the steel pipe wall, and the heat preservation temperature is 600 degrees Celsius. In this embodiment, the thickness of the steel pipe is 10 mm, and since the heat preservation time is twice the thickness of the steel pipe wall, the heat preservation time is 20 minutes. In the present invention, the heat preservation time in step 1) is measured in minutes, and the wall thickness of the steel pipe is measured in millimeters. Since the steel pipe will be partially oxidized by the oxygen in the air during the heat treatment process, and the higher the he...

Embodiment 2

[0042] In the efficient production process for improving the surface precision of cold-drawn seamless steel pipes in this example, step 2) process the steel pipes after mixing hydrochloric acid with a mass fraction of 5% and a release agent, and other steps are the same as in Example 1. Reducing the mass fraction of hydrochloric acid can reduce volatility, reduce pollution and improve the working environment. The hydrochloric acid and release agent with a mass fraction of 5% means that the mass of hydrochloric acid accounts for 5% of the total solution, and the amount of release agent can be added as appropriate.

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

No PUM Login to view more

Abstract

The invention relates to a high-efficiency production process capable of improving the surface accuracy of a cold-drawn seamless steel tube, comprising the following steps of: 1) conducting heat treatment: conveying the steel tube into a heat treatment furnace, performing heat treatment at a temperature being 800-1000 DEG C, then performing heat-insulating treatment, wherein the heat-insulating time is 1.5-2.5 times of the thickness of the tube wall of the steel tube, and the heat-insulating temperature is 500-700 DEG C; 2) chemically removing scale cinder: conducting air-cooling on the steel tube to be a normal temperature, then soaking the steel tube in a mixed solution of 15-20% of hydrochloric acid and a release agent for a half of an hour; 3) cleaning: cleaning with clear water; 4) neutralizing: soaking the steel tube into sodium hydroxide solution with a pH value being 10-14 for 0.5-1 hours; 5) conducting a rust prevention procedure: soaking the steel tube in an antirust agent for 3-5 minutes; and 6) fining and straightening: straightening by using an eleven-roll straightening machine, and conducting other steps. The high-efficiency production process disclosed by the invention is good in straightening effect, safe and convenient to use, energy-saving, high in energy utilization rate, and good in scale cinder removing effect.

Description

technical field [0001] The invention relates to a production process for cold-drawn seamless steel pipes, in particular to an efficient production process for improving the surface precision of cold-drawn seamless steel pipes. Background technique [0002] At present, in the manufacturing process of cold-drawn seamless steel pipes, ordinary (oxidized) heat treatment is mostly used in the heat treatment process of domestic traditional seamless steel pipe production, and the production cost and equipment investment are low, but the steel pipes after heat treatment of the finished steel pipes produce serious scale, After straightening, the oxide skin is pressed into the surface of the steel pipe to cause defects such as pits and pits on the surface of the steel pipe, which cannot meet the high-precision requirements for the use of parts. Parts manufacturers increase production costs, but also reduce efficacy. Although a small number of steel pipe production enterprises have pr...

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
IPC IPC(8): B21C37/06C21D9/08B21D3/02
Inventor 吴国忠
Owner 浙江新纪元管业科技有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap