Processing method for improving temper embrittlement resistance of steel plate for pressure vessels

A technology for pressure vessels and processing methods, which is applied in the processing field of improving the temper embrittlement resistance of steel plates for pressure vessels, can solve the problems of increased difficulty in smelting and high production costs, and achieve excellent temper embrittlement resistance of steel plates and low production costs. The effect of low cost and easy production organization

Inactive Publication Date: 2014-04-23
SHOUGANG CORPORATION
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The purpose of the present invention is to provide a processing method for improving the temper embrittlement resistance of steel plates for pressure vessels, which overcomes the high production cost, high production cost, and Disadvantages of increased smelting difficulty

Method used

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  • Processing method for improving temper embrittlement resistance of steel plate for pressure vessels
  • Processing method for improving temper embrittlement resistance of steel plate for pressure vessels
  • Processing method for improving temper embrittlement resistance of steel plate for pressure vessels

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The verification experiment was carried out through 14Cr1MoR (A387Gr11CL2) steel plate. The smelting composition of the steel plate: C: 0.13%, Si: 0.55, Mn: 0.50%, P: 0.013%, S: 0.001%, Cr: 1.25%, Mo: 0.46%, As: 0.003%, Sb: 0.001, Sn: 0.0019%, the balance is Fe, the J coefficient is 157, the X coefficient is 14.6, and the J coefficient exceeds 150 judgment value.

[0040] After the steel plate is kept at 920°C for 20 minutes, it is weakly water-cooled, the cooling rate is controlled at 3°C / s, and the final cooling temperature is 350°C; it is tempered at 710°C, and the tempering is kept for 15 minutes; after tempering, the steel plate is sampled and mined at 680°C. .PWHT treatment, the holding time is 8 hours; after that, the sample is subjected to a step-cooling experiment, and the heating curve is as attached figure 1 shown. After Min.PWHT treatment and step-cooling experiment, samples were taken respectively. Using the impact energy-temperature curve, it was detected...

Embodiment 2

[0042]The verification experiment was carried out through 12Cr2Mo1R (A387Gr22CL2) steel plate. The smelting composition of the steel plate: C: 0.11%, Si: 0.48, Mn: 0.55%, P: 0.011%, S: 0.002%, Cr: 2.24%, Mo: 1.00%, As: 0.002%, Sb: 0.002, Sn: 0.002%, the balance is Fe, the J coefficient is 134, the X coefficient is 13, and the J coefficient exceeds the judgment value of 100.

[0043] After the steel plate is kept at 920°C for 20 minutes, it is weakly water-cooled, the cooling rate is controlled at 4°C / s, and the final cooling temperature is 330°C; it is tempered at 730°C, and the tempering is kept for 15 minutes; after tempering, the steel plate is sampled and mined at 680°C .PWHT treatment, the holding time is 8 hours; after that, the sample is subjected to a step-cooling experiment, and the heating curve is as attached figure 1 shown. After Min.PWHT treatment and step-cooling experiment, samples were taken respectively. Using the impact energy-temperature curve, it was detec...

Embodiment 3

[0045] The verification experiment was carried out through 15CrMoR (A387Gr12CL2) steel plate. The smelting composition of the steel plate: C: 0.14%, Si: 0.44, Mn: 0.50%, P: 0.014%, S: 0.001%, Cr: 0.95%, Mo: 0.45%, As: 0.0015%, Sb: 0.003, Sn: 0.001%, the balance is Fe, the J coefficient is 141, the X coefficient is 16.1, and the X coefficient exceeds the judgment value.

[0046] After the steel plate is kept at 920°C for 20 minutes, it is weakly water-cooled, the cooling rate is controlled at 2°C / s, and the final cooling temperature is 300°C; it is tempered at 710°C, and the tempering is kept for 15 minutes; after tempering, the steel plate is sampled and mined at 680°C. .PWHT treatment, the holding time is 8 hours; after that, the sample is subjected to a step-cooling experiment, and the heating curve is as attached figure 1 shown. After Min.PWHT treatment and step-cooling experiment, samples were taken respectively. Using the impact energy-temperature curve, it was detected ...

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Abstract

The invention provides a processing method for improving the temper embrittlement resistance of a steel plate for pressure vessels, belonging to the technical field of medium plate production. A Cr-Mo system low alloy steel plate for pressure vessels is subjected to weak water cooling treatment after being normalized. The processing method is characterized in that the technical parameters of control are as follows: the rolled steel plate is normalized, the normalizing temperature is 850-950 DEG C, and the steel plate is insulated for 5-30 minutes; the steel plate immediately enters a quenching machine after being discharged to be subjected to weak water cooling treatment, the final cooling temperature of the steel plate is controlled at 300-500 DEG C, and then the steel plate is air-cooled to the room temperature; the weak water cooling speed is controlled at 2-5 DEG C / s; the tempering temperature is 700-760 DEG C, and the tempering and insulating time is 5-30 minutes. The processing method has the advantages that the element P in the treated steel plate can be controlled within 0.015%; the final temper embrittlement resistance of the steel plate can achieve and exceed that of the steel plates produced by traditional methods; a uniform lath bainite structure is formed after the steel plate is normalized and subjected to weak water cooling treatment, thus being beneficial for improvement of the temper embrittlement resistance of the steel plate; as the temper embrittlement resistance of the steel plate is improved by the method of heat treatment, the production cost is lower, the production organization is easier and the method is widely applied.

Description

technical field [0001] The invention belongs to the technical field of medium and heavy plate production, and in particular relates to a processing method for improving the temper embrittlement resistance of steel plates for pressure vessels, which improves the temper embrittlement resistance of Cr-Mo low-alloy steel plates for pressure vessels. Background technique [0002] Temper embrittlement is some low-alloy steels, especially Cr-Mo low-alloy steels, which have been served for a long time at 325-565°C or slowly cooled in this temperature range. When they are at ambient temperature, the phenomenon of metal embrittlement is called Temper embrittlement. [0003] Cr-Mo low-alloy steels specifically include national standard grades 15CrMoR, 14Cr1MoR and 12Cr2Mo1R (American standard grades A387Gr12, A387Gr11, A387Gr22), etc., which are heat-strength steels and hydrogen-resistant steels commonly used in countries all over the world, and are widely used in the manufacture of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D6/00C21D1/28C22C38/22
Inventor 赵楠隋鹤龙邹扬秦丽晔樊艳秋姜中行刘建明张学峰冯路路
Owner SHOUGANG CORPORATION
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