Processing method of low yield ratio high strength titanium coiled plate for heat exchanger

A processing method and low yield-strength ratio technology, which are applied in the field of processing titanium coils for high-strength heat exchangers, can solve the problems of tensile strength not higher than 340MPa, low yield-strength ratio, etc., and achieve excellent deep-drawing performance and yield strength. The effect of lower ratio and lower production cost

Active Publication Date: 2013-11-27
LUOYANG SUNRUI TI PRECISION CASTING
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0003] The inventor chose the mainstream heat exchanger plates in the market, and tested the transverse mechanical properties of titanium plates for heat exchangers produced by different Japanese manufacturers and domestic manufacturers. The results showed that the tensile strength of titanium plates for heat exchangers produced at home and abroad is generally not It is higher than 340MPa, as shown in Table 1 in the accompanying drawings. Considering the safety of the welded plate-shell heat exchanger operating under high pressure, the titanium plate is required to have a large thickness. For high-strength heat exchange with low yield ratio Titanium coils for appliances have not been reported in domestic literature and patents

Method used

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  • Processing method of low yield ratio high strength titanium coiled plate for heat exchanger
  • Processing method of low yield ratio high strength titanium coiled plate for heat exchanger
  • Processing method of low yield ratio high strength titanium coiled plate for heat exchanger

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Embodiment 1

[0036] 1) Slab preparation: Grade 1 sponge titanium with a Brinell hardness of 105HB is selected. The test results of the sponge titanium composition are Fe=0.034%, C=0.02%, O=0.05%, N=0.007%, and oxygen equivalent [O]=0.05 %+0.5×0.034%+0.7×0.02%+2.5×0.007%≌0.099%. According to the experience of smelting pure titanium ingots in an electron beam cooling bed, the oxygen content of ingots is about 0.01% higher than that of sponge titanium, and the content of Fe, C, and N impurity elements will basically not increase during the smelting process. The composition of the smelted titanium ingots meets: the O content is 0.05-0.08%, the Fe content is not more than 0.05%, the C content is not more than 0.03%, the N content is not more than 0.01%, and the oxygen equivalent is between 0.10-0.13%. Smelting ingot according to [004]~[016] section described in patent document 1, 500mm from the head and tail of the ingot and sampling test in the middle of the ingot, the chemical composition tes...

Embodiment 2

[0045] 1) Slab preparation: Grade 0 sponge titanium with a Brinell hardness of 98HB is selected. The test results of the sponge titanium composition are Fe=0.04%, C=0.008%, O=0.042%, N=0.004%, and oxygen equivalent [O]=0.042 %+0.5×0.04%+0.7×0.008%+2.5×0.004%≌0.078%. According to the experience of smelting pure titanium ingots in electron beam cooling bed, the oxygen content of cast ingots is about 0.01% higher than that of sponge titanium, and the content of Fe, C, and N impurity elements will basically not increase during the smelting process. The composition of titanium ingots after smelting must meet: O The content is 0.05-0.08%, the oxygen equivalent is between 0.10-0.13%, and titanium dioxide needs to be added. The oxygen equivalent is designed according to the target value of 0.115, and the added oxygen value of titanium dioxide is 0.115%-0.01%-0.078%=0.027%. After calculation, the weight of titanium dioxide added to 100 kg of titanium sponge is m=0.027÷0.45×1000=60g. A...

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Abstract

The invention provides a processing method of a low yield ratio high strength titanium coiled plate for a heat exchanger. The processing method of the titanium coiled plate comprises the following steps of: preparing a plate blank; rolling a hot coil; annealing the hot coil; performing surface treatment on the hot coil; cold rolling; degreasing; and annealing to obtain the low yield-ratio high titanium coiled plate for the heat exchanger. According to the processing method, the content of a titanium cast ingot is controlled, and the processing technology of a titanium tape is utilized, so that the tensile strength of a titanium plate is about 385+/-15MPa, and the yield ratio is not greater than 70%; and with the improvement of the tensile strength of the titanium plate for the heat exchanger, the design thickness of the titanium plate can be reduced by more than 10%, and therefore, the titanium plate being 0.5 to 1.2mm in thickness can be prepared for the heat exchanger. Compared with the titanium coiled plate in the prior art, the titanium coiled plate processed by the method provided by the invention has high strength, low yield ratio and high deep drawing performance, and the production cost is also greatly decreased.

Description

technical field [0001] The invention relates to a production process of a titanium coil, in particular to a processing method of a titanium coil for a high-strength heat exchanger with a low yield ratio. Background technique [0002] As we all know, the heat exchanger is a general process equipment widely used in chemical industry, oil refining, power, food, light industry, atomic energy, pharmaceutical, aviation and many other industrial sectors, and the plate and shell heat exchanger concentrates the traditional plate heat exchanger The advantages of heat exchangers and shell heat exchangers, especially titanium welded plate and shell heat exchangers have the advantages of corrosion resistance, pressure drop, small footprint, and high heat exchange efficiency, but because titanium metal has less slip systems, Hexagonal close-packed metal with poor symmetry, and the difference between yield strength and tensile strength is small, that is, the yield ratio is high, and most o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B9/22C22B34/12B21B1/22B21B3/00C22F1/18
Inventor 顾新盛崔为研王卫超李渤渤
Owner LUOYANG SUNRUI TI PRECISION CASTING
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