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

Intermediate test method for smelting non-quenched and tempered steel

A non-quenched and tempered steel, intermediate test technology, applied in the intermediate test of smelting non-quenched and tempered steel, the intermediate test field of free-cutting non-quenched and tempered steel, can solve the problems of denaturation treatment of inclusions, etc., to delay the solidification time, improve the internal Quality, anti-splash effect

Inactive Publication Date: 2017-12-08
SHOUGANG CORPORATION
View PDF3 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide an intermediate test method for smelting non-quenched and tempered steel, which solves the problems of controlling the content of N, Ca and other elements in steel and the denaturation treatment of inclusions in vacuum induction furnace.

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
  • Intermediate test method for smelting non-quenched and tempered steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The following examples adopt the experimental method of smelting free-cutting non-quenched and tempered steel in a 50Kg vacuum induction furnace.

example

[0018] Example: Composition requirements of free-cutting non-quenched and tempered steel YF45MnVN and finished product composition (wt%) of the number of test furnaces

[0019]

[0020] Note: 1. Requirements for residual elements: Cr≤0.15%, Ni≤0.15%, Cu≤0.20%.

[0021] 2. The final result of the content of the above residual elements is basically consistent with the industrial pure iron used as the base material, meeting its requirements.

[0022] 3. Ultra-low CS analyzer for C and S element analysis, and direct reading spectrometer for other element analysis.

[0023] 1. The base material is industrial pure iron, and its composition mass percentage is: C: 0.004%, Si: 0.01%, Mn: 0.04%, P: 0.007%, S: 0.006%, Cr: 0.012%, Ni: 0.006%, Cu: 0.004%, Al: 0.008%, V: 0.002%, Nb: 0.004%, [O]: 0.008%, [N]: 0.0048%. Metal silicon contains Si: 95.8%; metal manganese contains Mn: 99.9%; VN contains V: 79.7%, contains N: 9.6%; ferrosilicon nitride contains N: 26.2%, contains Si: 28.2%; s...

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 an intermediate test method for smelting non-quenched and tempered steel, belonging to the technical field of steelmaking by using a vacuum induction furnace. The intermediate test method comprises key process technologies and operation of high-vacuum and medium-high temperature refining, proper refining time, nitrogen filled protection, low-temperature charging, medium-temperature tapping, adding silicon calcium alloy in batches, strong stirring, charged pouring, slag-stopping pouring, insulated solidification, etc. The method comprises the steps: during smelting, pumping vacuum for 2-3min and transmitting power for melting; during refining, utilizing carbon deoxidation under vacuum; before the end of refining, adding metallic silicon, filling nitrogen for protection, adding Al for preliminary dexidation, and then alloying; before tapping, dumping the furnace for charged pouring, and breaking after tapping. The method has the advantages of effectively preventing molten steel spilling, precisely controlling the content and the yield of N and Ca in steel, improving the shape and size of impurities, improving the purity of steel, and reaching the smelting purpose that the vacuum induction furnace is easy to cut the non-quenched and tempered steel.

Description

technical field [0001] The invention belongs to the technical field of vacuum induction furnace steelmaking, in particular to an intermediate test method for smelting non-quenched and tempered steel. In particular, it relates to an intermediate test method for smelting nitrogen-containing free-cutting non-quenched and tempered steel in a vacuum induction furnace. Background technique [0002] The free-cutting non-quenched and tempered steel YF45MnVN requires that the [N] content in the steel be 150-250ppm, and the S content be 0.035-0.065%. The sulfide in the steel is denatured, and its nitrogen and vanadium form vanadium nitride in the steel, which can refine the grain, form and stabilize the austenite structure, and play a role in precipitation strengthening. In order to meet the performance requirements of free-cutting non-quenched and tempered steel, the content of C, Si, Mn, P, S, V, Ca, N, etc. must be strictly controlled. [0003] In order to master the various prop...

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 Applications(China)
IPC IPC(8): C21C5/52C22C33/06C22C38/04C22C38/02C22C38/12C22C38/06C22C38/60
CPCC21C5/5241C22C33/06C22C38/02C22C38/04C22C38/06C22C38/12C22C38/60Y02P10/20
Inventor 杨卫中李涛卢伟白京磊王超刘建臣魏晓峰
Owner SHOUGANG CORPORATION