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Preparation method of steel applied to dimethyl ether storage pressure vessel

A pressure vessel and dimethyl ether technology, applied in the field of iron and steel metallurgy, can solve the problems of high C content, poor welding performance, unsuitable for the use of dimethyl ether storage containers, etc., and achieve the effects of good welding performance and good impact performance.

Inactive Publication Date: 2014-05-21
锡山区鹅湖慧盾机械厂
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the C content in this patented steel is too high, and the welding performance is not good
Not suitable for use in DME storage containers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A method for preparing steel for dimethyl ether storage pressure vessel, the chemical composition of the steel consists of the following components in weight percentage: C: 0.06, Si: 0.20, Mn: 0.95, Ti: 0.07, Nb: 0.07, Cr : 1.40, Ni: 0.50, Mo: 0.90, V: 0.05, P: ≤0.015, S: ≤0.010, Als: 0.025, Cu: 0.30, the rest is Fe and unavoidable impurities; the preparation method shown includes the following steps:

[0027] 1) Electric furnace smelting, LF refining, VD vacuum degassing, pouring temperature of molten steel at 1610°C, and casting into billets;

[0028] 2) For rolling, the billet heating temperature is 1200°C, the steel starting rolling temperature is 1130°C, the rough rolling and finishing rolling temperature is 955°C; the finish rolling starting rolling temperature is 960°C, the cumulative reduction rate is greater than 70%, and the finishing rolling temperature is 860°C ℃;

[0029] 3) Heat treatment, the normalizing temperature is 930°C, and the holding time is: 60m...

Embodiment 2

[0031] A method for preparing steel for dimethyl ether storage pressure vessel, the chemical composition of the steel consists of the following components in weight percentage: C: 0.08, Si: 0.10, Mn: 1.15, Ti: 0.05, Nb: 0.09, Cr : 1.30, Ni: 0.70, Mo: 0.70, V: 0.15, P: ≤0.015, S: ≤0.010, Als: 0.015, Cu: 0.50, the rest is Fe and unavoidable impurities; the preparation method shown includes the following steps:

[0032] 1) Electric furnace smelting, LF refining, VD vacuum degassing, molten steel pouring temperature is 1650 ℃, pouring into billets;

[0033] 2) Rolling, the billet heating temperature is 1240°C, the steel rolling temperature is 1110°C, the rough rolling and finishing rolling temperature is 975°C; the finish rolling starting rolling temperature is 940°C, the cumulative reduction rate is greater than 70%, and the finishing rolling temperature is 880 ℃;

[0034] 3) Heat treatment, the normalizing temperature is 950°C, and the holding time is: 50min+t×1min / mm, where t ...

Embodiment 3

[0036]A method for preparing steel for dimethyl ether storage pressure vessel, the chemical composition of the steel consists of the following components in weight percentage: C: 0.07, Si: 0.15, Mn: 1.05, Ti: 0.06, Nb: 0.08, Cr : 1.35, Ni: 0.60, Mo: 0.80, V: 0.10, P: ≤0.015, S: ≤0.010, Als: 0.020, Cu: 0.40, the rest is Fe and unavoidable impurities; the preparation method shown includes the following steps:

[0037] 1) Electric furnace smelting, LF refining, VD vacuum degassing, molten steel pouring temperature is 1630 ℃, pouring into billets;

[0038] 2) Rolling, the billet heating temperature is 1230°C, the steel rolling temperature is 1120°C, the rough rolling and finishing rolling temperature is 965°C; the finish rolling starting rolling temperature is 950°C, the cumulative reduction rate is greater than 70%, and the finishing rolling temperature is 870 ℃;

[0039] 3) Heat treatment, the normalizing temperature is 940°C, and the holding time is: 55min+t×1min / mm, where t i...

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Abstract

The invention discloses a preparation method of steel applied to a dimethyl ether storage pressure vessel. The preparation method comprises the steps that 1) electric furnace smelting, LF refining, VD vacuum degassing, liquid steel casting at the temperature of 1610 to 1650 DEG C, and casting billet are carried out; 2) rolling is carried out, wherein the billet heating temperature is 1200 to 1240 DEG C, the steel rolling starting temperature is 1110 to 1130 DEG C, the rough rolling finishing temperature is 955 to 975 DEG C, the finish rolling starting temperature is 940 to 960 DEG C, the cumulative reduction rate is greater than 70%, and the final rolling temperature is 860 to 880 DEG C; and 3) heat treatment is carried out, wherein the normalizing temperature is 930 to 950 DEG C, the heat preservation time is 50 to 60min+t*1min / mm, t is the thickness of a steel plate, and the unit is mm.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to a method for preparing steel for dimethyl ether storage pressure vessels. Background technique [0002] Domestic production, storage and transportation of dimethyl ether basically use Q345R steel for the manufacture of storage tanks, because the strength of this kind of steel is low, and the wall thickness of the manufactured container is relatively thick, which is inconvenient to use. Although Q370R steel can be used as a substitute, there is no H in the medium of dimethyl ether production, storage and transportation. 2 The existence of S eliminates the restriction on the strength of the material, so steel grades with higher strength than Q370R can be used for equipment upgrades. 10000m 3 The above production and storage devices for dimethyl ether and other large pressure vessels require a high-strength pressure vessel steel with a tensile strength of 570MPa ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/50C22C33/04C21D8/04
Inventor 诸金平
Owner 锡山区鹅湖慧盾机械厂
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