Low-temper-brittleness Cr-Mo steel plate for high temperature resisting pressure-bearing equipment and preparation method of steel plate

A technology of temper brittleness and pressure-bearing equipment, which is applied in the field of iron and steel, can solve the problems of lack of temper brittleness factors such as J coefficient and X coefficient, and achieve the effects of low brittleness coefficient, mechanical stability, and high-temperature durable mechanical properties

Active Publication Date: 2015-07-29
SHANDONG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent literature (such as CN 102796957A, CN 101691639A) pays attention to low-cost production, conventional mechanical properties or control of low sulfur (S) content, etc., does not involve strict control of P, As, Sn, Sb in steel, and lacks the measure of tempering Description of J Coefficient and X Coefficient of Fragility Factors

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The chemical composition and weight percentage content of the steel plate produced according to the method of the present invention are: C: 0.138%, Si: 0.24%, Mn: 0.49%, S: 0.002%, P: 0.011%, Cr: 0.97%, Mo: 0.49%, Sn: 0.003%, Sb: 0.001%, As: 0.004%, and the rest are Fe and trace impurities. The J coefficient is 102.2, and the X coefficient is 13.1, where J=(Si+Mn)×(P+Sn)×10 4 , where Si, Mn, P, and Sn are percentages by weight. X=(10P+5Sb+4Sn+As) / 100, where P, Sb, Sn and As are ppm numbers.

[0029] The manufacturing method of the low temper brittleness Cr-Mo system steel plate for high temperature resistant pressure equipment of the present embodiment is as follows:

[0030] (1) Smelting: The molten iron is processed by KR pretreatment, 120-ton top-bottom combined blowing converter smelting, 120-ton LF ladle furnace refining, 120-ton RH vacuum degassing refining and slab continuous casting machine to obtain a section size of 200mm× The 150mm continuous casting slab,...

Embodiment 2

[0036] The chemical composition and weight percentage content of the steel plate produced according to the method of the present invention are: C: 0.140%, Si: 0.23%, Mn: 0.56%, S: 0.002%, P: 0.009%, Cr: 1.01%, Mo: 0.47%, Sn: 0.001%, Sb: 0.001%, As: 0.003%, and the rest are Fe and trace impurities. The J coefficient is 79.0, and the X coefficient is 10.2, where J=(Si+Mn)×(P+Sn)×10 4 , where Si, Mn, P, and Sn are percentages by weight. X=(10P+5Sb+4Sn+As) / 100, where P, Sb, Sn and As are ppm numbers.

[0037] The production preparation method of the present embodiment is the same as embodiment 1, the difference is:

[0038] (1) The final rolling thickness of the steel plate is 30mm, the temperature of the finish rolling and start rolling of the billet is 930°C, and the thickness of the finish rolling start rolling of the billet is 3.5 times of the thickness of the finished steel plate;

[0039] (2) Slow cooling of the steel plate: the slow cooling time of the steel plate stack af...

Embodiment 3

[0043] The chemical composition and weight percentage content of the steel plate produced according to the method of the present invention are: C: 0.143%, Si: 0.26%, Mn: 0.57%, S: 0.003%, P: 0.010%, Cr: 1.05%, Mo: 0.48%, Sn: 0.002%, Sb: 0.001%, As: 0.004%, and the rest are Fe and trace impurities. The J coefficient is 99.6, and the X coefficient is 11.7, where J=(Si+Mn)×(P+Sn)×10 4 , where Si, Mn, P, and Sn are percentages by weight. X=(10P+5Sb+4Sn+As) / 100, where P, Sb, Sn and As are ppm numbers.

[0044] The production preparation method of the present embodiment is the same as embodiment 1, the difference is:

[0045] (1) The final rolling thickness of the steel plate is 40mm, the finish rolling start temperature of the billet is 920°C, and the finish rolling start thickness of the billet is 3.0 times the thickness of the finished steel plate;

[0046] (2) Slow cooling of the steel plate: the slow cooling time of the stacked steel plate after the final shaping and rolling...

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Abstract

The invention discloses a low-temper-brittleness Cr-Mo steel plate for high temperature resisting pressure-bearing equipment and a preparation method of the steel plate. The steel plate comprises the following chemical components in percentage by weight: 0.05-0.17 percent of C, smaller than or equal to 0.30 percent of Si, 0.40-0.65 percent of Mn, smaller than or equal to 0.035 percent of S, smaller than or equal to 0.015 percent of P, 0.80-1.15 percent of Cr, 0.45-0.60 percent of Mo, smaller than or equal to 0.005 percent of Sn, smaller than or equal to 0.005 percent of Sb, smaller than or equal to 0.005 percent of As and the balance of Fe and trace of impurities. By composite addition of Cr and Mo alloy elements, reasonable Si and Mn content design, strict control on low P content and extremely low residual element Sn and implementation of technologies of 4300mm double-frame rolling, normalization, high-temperature tempering and the like, the steel plate for the high temperature resisting pressure-bearing equipment can be obtained. The steel plate has the characteristics of being low in temper brittleness coefficient and mechanically stable, lasting in high temperature in a core part of a thick-specification steel plate, high in mechanical properties and the like, and is suitable for manufacturing high temperature pressure-bearing equipment.

Description

technical field [0001] The invention relates to the technical field of iron and steel, in particular to a low temper brittle Cr-Mo steel plate for high-temperature resistant pressure-bearing equipment and a preparation method thereof. Background technique [0002] Cr-Mo series steel plates for pressure equipment are widely used in the manufacture of pressure equipment such as hydrogenation reactors, ammonia synthesis units, and urea cooperation units. The equipment has been in service for a long time under harsh conditions of high temperature and high pressure. This type of steel tends to be brittle in the temperature range of 350-600°C, which will lead to the aging of the manufacturing materials and cause safety accidents. For this reason, steel plates for Cr-Mo pressure-bearing equipment for high temperature resistance generally have clear requirements for the J coefficient and X coefficient that characterize the tendency of temper brittleness. [0003] The published pate...

Claims

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Application Information

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IPC IPC(8): C22C38/60C22C38/22C21D8/02
Inventor 黄少文周平张长宏霍孝新武文健陈永南吴会亮王月香
Owner SHANDONG IRON & STEEL CO LTD
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