A kind of rolling billet containing rare earth 37mnre for gas cylinder and its manufacturing method

A technology for rolling billets and rare earths, which is applied to the field of rolling billets containing rare earth 37MnRE for gas cylinders and the field of manufacturing thereof, which can solve the problem that the rare earth content of the gas cylinder billet is not specified, the calcium content of rare earth and calcium are matched, the manufacturing is difficult to precisely control, and the There are problems such as the cleanliness of molten steel, so as to achieve the effect of improving the performance and mechanical properties of the punching and drawing process, with less fluctuation in performance and less difficulty in the production process.

Active Publication Date: 2021-06-22
BAOTOU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is that the rare earth content, the calcium content and the matching of the rare earth and calcium are not clearly defined in the prior art; the material cost and the operation cost of the rare earth addition method are relatively high , the manufacturing is difficult to control precisely, and the product quality is not good; there is cleanliness of molten steel when rolling the cylinder billet, and trace residual elements bring adverse effects on subsequent operators and the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0096] 1. The blast furnace molten iron is pretreated so that the S content (percentage by weight) in the molten iron is reduced to below 0.010%;

[0097] 2. Mix the pretreated molten iron into the top-bottom combined blowing converter, add (weight percentage) 10% high-quality scrap steel, adopt single slag process to smelt, control the final slag basicity and end target, and carry out deoxidation alloying during the tapping process. The final deoxidation adopts the aluminum deoxidation process, the slag must be blocked or removed during the tapping process, and the lime block is added after the alloy is added during the tapping process;

[0098] 3. Refining in LF furnace and adding VFe alloy: during the whole refining process, argon is blown normally as required, and the temperature is raised by gradually increasing the heating rate from low-level to high-level; according to the composition and temperature of molten steel in the converter, slag desulfurization and composition ...

Embodiment 2

[0113] 1. The blast furnace molten iron is pretreated so that the S content (percentage by weight) in the molten iron is reduced to below 0.010%;

[0114] 2. Mix the pretreated molten iron into the top-bottom combined blowing converter, add (weight percentage) 10% high-quality steel scrap, use single slag process to smelt, control the final slag basicity and end target, and carry out deoxidation alloying during the tapping process. The final deoxidation adopts the aluminum deoxidation process, the slag must be blocked or removed during the tapping process, and the lime block is added after the alloy is added during the tapping process;

[0115] 3. Refining in LF furnace and adding VFe alloy: during the whole refining process, argon is blown normally according to the requirements, and the temperature is raised by gradually increasing the heating rate from low-level to high-level; according to the composition and temperature of converter molten steel, slag desulfurization and com...

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Abstract

The invention discloses a rare earth-containing 37MnRE rolling billet for gas cylinders, the billet includes the following components in weight percentage: C 0.34-0.40%; Si 0.17-0.37%; Mn 1.35-1.75%; P≤0.030 %; S≤0.030%; Cr≤0.25%; Ni≤0.25%; Cu≤0.20%; RE 0.0010~0.0040%; Ca 0.0010~0.0040%. The invention also discloses a manufacturing method of the billet. The billet and its manufacturing method of the present invention clearly optimize the rare earth content, calcium content, and the matching ratio of rare earth and calcium to manufacture the billet product with good quality; the manufacturing method operation and parameters are optimized, the method is simple and easy to control, and the rare earth The cost is added to improve production efficiency and reduce energy consumption and production costs; the molten steel in the manufacturing process has high cleanliness, safety and environmental protection, which is conducive to meeting the needs of social development.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to a rare earth-containing 37MnRE rolling billet for gas cylinders and a manufacturing method thereof. Background technique [0002] Gas cylinder is a mobile steel cylinder that can be refilled with O2, H2, CO2 and other permanent gases or high-pressure liquefied gas. The working pressure is generally 15-30MPa. , medical, military and other sectors of the national economy. Gas cylinders are high-pressure containers, which are the largest number of special equipment in my country. With the development of gas industry and electronic industry, the gas cylinder industry is also developing rapidly, and the demand for gas cylinders is also increasing. There are two main methods for manufacturing seamless gas cylinders. One is the forging bottle method, which uses a square steel billet to be stretched and closed by hot stamping (extrusion); Closing and bottom molding. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/42C22C38/58C22C33/04C21C7/00C21C7/072
CPCC21C7/0006C21C7/072C22C33/04C22C38/002C22C38/005C22C38/02C22C38/04C22C38/42C22C38/58Y02P10/20
Inventor 程德富班华曹晓明
Owner BAOTOU IRON & STEEL GRP
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