CN1259585A - Two special corrosion resisting low alloy plates and its petrochemical equipment, pipeline and matching parts - Google Patents

Abstract

The present invention relates to two special anticorrosion low alloy plates and petrochemical equipments, pipe line and parts made of said materials. Since said materials 12AlMoV and 12Cr2AlMOV possess exceedingly good behaviour against sulfur corrosion, the two special anticorrosion low alloy plates are particularly suitable for use in high corrosive medium such as high temp. sulfur, low temp. hydrogen sulfide, hydrogen cyanide rare organic acid etc. It can be extensively used in petrochemical, chemical engineering and pharmaceutical industries.

Description

Two kinds of special corrosion resisting low alloy plates and petrochemical equipment, pipeline and accessory combinations

The present invention relates to impregnating material and anticorrosion equipment, line of pipes and the accessory field of industry static equipment devices such as refining of petroleum, chemical industry, pharmacy.

The corrosion prevention problem that solves industry static equipment devices such as oil, chemical industry, pharmacy is the problem of the important spy meter of petrochemical industry for many years always, particularly the etching problem of refining of petroleum industry is more outstanding at present, seriously hindered the normal development of petrochemical industry, directly cause the frequent and benefit reduction of maintenance, the major measure and the existing problems of present domestic solution petrochemical industry corrosion-resistant field:

1. be composite board material and stainless material in the major measure of being taked aspect the housing of tower, container and cold exchange device.So-called composite board material is promptly made corrosion protective lining by the thin stainless steel materials of explosion welding technique applying one deck on materials such as common low-alloy 16MnR, 20R, and the cold-working poor-performing of composition board, when making end socket, basic unit and multiple layer take off easily and split, cause dangerous coefficient to increase, this external welding difficulty during with the composition board making equipment is bigger.Stainless steel and stainless steel composite plate material still can not be brought into play its effect at low temperature stress corrosion position, as at H ₂S-HCN-H ₂O, HCl-H ₂S-H ₂O and H ₂S-HCN-CO ₂-H ₂Anti-stress corrosion performance in the corrosive environment of O even not as good as carbon steel, its result of use is not omnipotent in petrochemical industry, and the manufacturing price of the prices of raw and semifnished materials of stainless steel and stainless steel clad plate and petrochemical equipment thereof is very high.

2. mainly adopting stainless steel and steel surface aluminizing technology aspect the protection against corrosion of tower inner member, tower tray, line of pipes, filler.The carbon steel tube technology mainly is to ooze layer of metal aluminium on the surface of plain carbon stool material by heat, to stop corrosive medium to matrix deeply.But from cost of investment, the starting material of stainless steel and carbon steel tube and manufacturing expense are still very high, and there is the inhomogenous phenomenon of aluminising in carbon steel tube, secondly aluminising is at high temperature to operate, general temperature is 750 ℃～950 ℃, alumetizing process is again to manufacture on the finished parts of tower tray and filler, therefore, very easily produces distortion and the influence use.In addition, the welding property of calorized steel is relatively poor, and the aluminized coating on surface very easily produces a large amount of pores after high temperature dissolves, and the weld is bigger to the destruction of aluminized coating, easily produces local corrosion.

The object of the present invention is to provide extremely mechanicals of two kinds of good special steel sheet materials of corrosion-resistant energy, replenish, to solve the deficiency of petrochemical industry at selection aspect the corrosion resistance and application problem as a kind of of oil, chemical industry design and select material.

Now technical scheme of the present invention is done concrete general introduction:

The smelting process of the present invention two kinds of special corrosion resisting low alloy plates 12AlMoV, 12Cr2AlMoV is an open hearth, oxygen top-blown or use electrosmelting.Rolling method is consistent with the rolling method of general steel plate.

The Chemical Composition and the mechanical property of 12AlMoV, two kinds of special corrosion resisting low alloy plates of 12Cr2AlMoV see the following form: the Chemical Composition % of table one, 12AlMoV steel pipe

Grade of steel	??C	????Mn	????Si	??????Mo	??????Al	??????V	????S.P
								??12AlMoV	≤0.12	??0.30/0.60	???≤0.4	???0.30/0.40	???0.70/1.10	???0.03/0.10	??≤0.035

The Chemical Composition % of table two, 12Cr2AlMoV steel pipe

Grade of steel	????C	????Mn	????Si	????Cr	????Al	????Mo	????V	???S.P
									12Cr2AlMoV	≤0.12	?0.30/0.60	?0.20/0.50	??2.00/2.50	??0.30/0.70	??0.30/0.40	??0.05/0.10	?≤0.035

The mechanical property of plate and thin plate among table three, 12AlMoV, the 12Cr2AlMoV

Material	Yield-point σ s????MPa	Tensile strength sigma b????MPa	Elongation δ 5?????％
				????12AlMoV	????≥21	????38～54	????≥19

Table four, 12AlMoV, 12Cr2AlMoV are used as the mechanical property of pressurized vessel plate of moderate thickness

Material	Yield-point σ s????MPa	Tensile strength sigma b????MPa	Elongation δ 5?????％
				???12Cr2AlMoV	????≥30	????≥43	????≥19

Welding rod that 12AlMoV, 12Cr2AlMoV are selected and welding condition:

12AlMoV steel of the same race and the welding of xenogenesis carbon steel are all selected the J507Mo manual electrode for use and are welded automatically and join 431 solder and welding wires with H-10MnSi, and its solderability is good, and corrosion-resistant and matrix are suitable.

12Cr2AlMoV adopts hot 317 welding rods and the automatic welding wire of H08CrMoVA to join 350 solder flux, weld preheating, and the postwelding thermal treatment that eliminates stress, the corrosion-resistant of its weld seam can be suitable with 12Cr2AlMoV.

The advantage of two kinds of special corrosion resisting steel alloy sheet materials is:

1. because 12AlMoV adopts normalizing, and 12Cr2AlMoV adopts normalizing+tempered rolling technology, the clod wash of its sheet material, shearing, punching performance are good, do not have the post-production difficult problem of material.

2. plate is made the tower inner member among employing 12AlMoV, the 12Cr2AlMoV, tower tray has entered a large amount of industrial applications, and its corrosion resistance is approved extensively that already corrosion resistance sees the following form.The whole nation annual in technological transformation, project begun newly the total amount of required composition board be about 2500T, and the not enough clad steel plate of the price of 12AlMoV, 12Cr2AlMoV plate of moderate thickness 60%.If adopt 12AlMoV, 12Cr2AlMoV plate of moderate thickness to replace stainless steel and stainless steel clad plate to do the housing of pressurized vessel (tower body, container, interchanger), will save a large amount of investments for domestic petrochemical industry.Sulfur corrosion performance that table five, 12AlMoV and Q235-A are high temperature resistant is mm/a relatively

Material	＞360 ℃ of sulfur-bearing 1.23% heavy oil	＞380 ℃ of sulfur-bearing 0.632% slurry oils	＞380 ℃ of sulfur-bearing 1.04% heavy oil	＞410 ℃ of heavy oil ring oil
					12AlMoV	????0.45	????0.016	????0.038	????0.048
?Q235-A	????1.70	????0.143	????0.36	????0.728

Annotate: these table data are tested by the steel development of last steel three factories.

The high temperature resistant sulphur of table six, 12Cr2AlMoV and Q235-A and other corrosive nature are relatively

Medium	Uniform corrosion mm/a	Hydrogen embrittlement coefficient (72h)	Hydrogen blistering
				Q235-A????12Cr2AlMoV	?25g?12Cr2AlMoV	?25g?12Cr2AlMoV
	The H2S-H2O saturation system	??0.4????????0.064	??65.2???23.4				A lot of few
The high-temperature sulfur corrosion medium				2.8～4.5???0.099～0.38

Annotate: these table data are tested by the steel development of last steel three factories.

3. adopt 12AlMoV, 12Cr2AlMoV cold rolled sheet to replace stainless steel and carbon steel tube filler, both reduced cost of investment, avoided filler machinery to be made into the passive practice of carrying out alitizing again behind the type again, and can at first not corrode the insufficient plain steel of part aluminising because of the aluminising inequality causes filler, and the situation that causes the packing layer in the tower in use to subside.

The present invention is concrete by following technical solution enforcement:

1. two kinds of special corrosion resisting low alloy plates can adopt open hearth, oxygen top-blown or electrosmelting.Plate of moderate thickness adopts hot rolling technology, steel sheet to adopt cold-rolling process.

2. as Fig. 1, Fig. 2, shown in Figure 3, the board selection 12AlMoV of tower, container, heat exchanger shell, line of pipes and the plate of manufacturing petrochemical equipment or the tray deck of tower, the material of 12Cr2AlMoV plate of moderate thickness, in order to improve the strength grade of steel plate, should carry out bound control to the carbon content in the steel, be defined as C=0.08～0.14%, positive and negative deviation is ± 0.01%, improve the content of manganese simultaneously, Mn brings up to 070～1.00% by 0.30～0.60%, positive and negative deviation ± 0.1%, the physicals value: yield-point should reach σ _s〉=30MPa, tensile strength should reach σ _b〉=43MPa.Technical requirements should meet the relevant regulations among the standard of GB6654-1996 " pressurized vessel with carbon steel and low-alloy Plate Steel " and the GB150-1998 " Steel Pressure Vessels " the 4th " material ".

3. as Fig. 5, shown in Figure 6 with the regular and random packing part in 12AlMoV, 12Cr2AlMoV steel sheet and the steel band processing tower, through repeatedly being calendered to the cold-strip of 0.1～1.2mm, the width dimensions of band should be according to the required specification scale of the actual manufacturing of filler with the cold rolling flat board of δ=2～4mm or band for material.Manufacturing and standard for acceptance should be with reference to the demand of technical standard of GB11253-89 " structural carbon steel and low-alloy structural Cold Rolled Sheet Steel and steel band ", GB710-91 " highquality carbon steel structure iron hot rolled steel sheet and steel band " and GB708 " size of cold-rolled steel sheet and steel band, profile, weight and permissible variation ".The every calendering of cold-rolled steel strip once all need be annealed, and final finished should be delivered goods with Annealed Strip.

4. as Fig. 1, Fig. 2, shown in Figure 3, the housing component 1 of tower, container, interchanger, end socket spare 2, manhole pipe nipple spare 5 usefulness 12AlMoV or 12Cr2AlMoV make, jointed tubular workpieces 3, flange part 4 usefulness 15CrMo or Cr5Mo, Cr9Mo make, at the not too serious position of corrosion, the plain steel 20 of the still available ordinary steel of flange part 4 ^#Forging is made.The strict code requirement of carrying out GB150-1998 " Steel Pressure Vessels " and GB151-1998 " steel tube shell type interchanger " of manufacturer's standard.But 12Cr2AlMoV sheet material must be through 200 ℃～250 ℃ preheating in welding, the postweld heat preservation slow cooling, and need carry out 750 ℃ temper to integral device.

5. the associated components of tray column tower inside and tower tray spare (part 7-1～part 7-8) adopt Machine Manufacturing Technology such as shearing, punching press, hydraulic pressure flanging, welding with plate manufacturing among 12AlMoV or the 12Cr2AlMoV in the manufacturing as shown in Figure 4.Need preheating according to 200 ℃～250 ℃ about the weldprocedure of 12Cr2AlMoV, the postweld heat preservation slow cooling needs the tower tray weld seam is carried out the tempering heat treatment of part or whole 750 ℃ in addition.The manufacturing of 12AlMoV, 12Cr2AlMoV tray deck and member and standard for acceptance should meet the regulation of JB1205-80 " tower tray technical qualification ".

6. as the part in Fig. 1 tower 6, part 8 and Fig. 5, shown in Figure 6, regular and random packing 12AlMoV, 12Cr2AlMoV steel sheet or thin steel band impact briquetting, wherein structured packing is the steel band that mesh plate ripple and corrugated plate dst filler adopt δ=0.1～0.3mm thickness, the steel band or the steel plate of δ=0.4～1.2mm thickness adopted in random packing, according to different packing varieties and specification requirement impact briquetting, regular, the manufacturing of random packing and standard for acceptance should meet HB/T21554-95 " rectangular saddle ring filler ", HG/T21556-95 " Pall ring filler ", HG/T21557-95 " cascade ring filler ", the technical requirements of HG/T21559.1-95 " stainless (steel) wire perforated plate corrugated filler ".

7. as shown in Figure 7, required fluid feed line adopts 12AlMoV or the welding of 12Cr2AlMoV sheet material in oil and gas and the refining of petroleum processing industry, welded tube can be spiral and straight-line joint type or splicing welding joint, and its manufacturing and standard for acceptance should meet the relevant technologies regulation that requires in GB/T3092-93 " low-pressure fluid is carried and used Welded Steel Pipe ", GB12771.-91 " fluid is carried and the used the stainless steel Welded Steel Pipe " standard.

Be described as follows among the figure:

Fig. 1 tower: 1. end socket 2. housings 3. are taken over 4. flanges, 5. manhole pipe nipples

6. structured packing 7-0 tower tray 8. random packings

Fig. 2 container: 1. end socket 2. housings 3. are taken over 4. flanges, 5. manhole pipe nipples

Fig. 3 interchanger: 1. end socket 2. housings 3. are taken over 4. flanges

Fig. 4 tower inner member and tower tray: 7-1 web plate 7-2 I-beam 7-3 pressing plate 7-4 tray deck

7-5 seal pot 7-6 liquid discharging plate 7-7 strutbeam 7-8 bearing

Fig. 5 random packing: part 1 is that Bauer ring 2 is rectangular saddle ring for ladder ring 3

Fig. 6 structured packing

Fig. 7 pipeline: part 1 is that spiral shell welded tube spare 2 is the splicing welded tube for vertical masonry joint pipe fitting 3

Claims (8)

1. two kinds of low alloy plates and petrochemical equipment, pipeline and accessory goods by special anti-rotten technical recipe, it comprises two kinds of materials-be the composition of proportions of 12AlMoV, 12Cr2AlMoV low-alloy composition, and petrochemical equipment (Fig. 1, Fig. 2, Fig. 3), tower tray and member (Fig. 4), inner-tower filling material goods (Fig. 5, Fig. 6) and the line of pipes (Fig. 7) made with these two kinds of materials.

2. the composition of proportions as claims 1 described two kinds of special steel plate low-alloy compositions is:

A.12AlMoV Chemical Composition % grade of steel C Mn Si Mo Al V S.P 12AlMoV≤0.12 0.30/0.60≤0.4 0.30/0.40 0.70/1.10 0.03/0.10≤0.035 of steel pipe

B.12Cr2AlMoV Chemical Composition % grade of steel C Mn Si Cr Al Mo V S.P 12Cr2AlMoV≤0.12 0.30/0.60 0.20/0.50 2.00/2.50 0.30/0.70 0.30/0.40 0.05/0.10≤0.035 of steel pipe

C. when making steel plate of pressure vessel with two kinds of steel plates of 12AlMoV, 12Cr2AlMoV, the carbon content in two kinds of steel should be controlled at C:0.08～0.14% ± 0.01%, and manganese content should bring up to 0.70～1.0% ± 0.01% by Mn:0.3～0.6%.

D.12AlMoV, in the 12Cr2AlMoV steel residual content of Ni, Cu be not more than≤0.03%.

3. as claims 1 and claims 2 described 12AlMoV, 12Cr2AlMoV steel plate specification be:

A. thin plate or steel band: thickness δ=0.10～4.0mm, but width scale;

B. middle plate: thickness δ=4.0～20.0mm, but width scale;

C. thickness: thickness δ=22.0～100.0mm, but width scale.

4. be 12AlMoV or 12Cr2AlMoV as tower, container, the housing component 1 of interchanger, end socket spare 2, manhole pipe nipple spare 5 in claims 1 described petrochemical equipment (Fig. 1, Fig. 2, Fig. 3), jointed tubular workpieces 3, flange part 4 usefulness 15CrMo or Cr5Mo, Cr9Mo make.

As claims 1 described tower tray and tower inner member (Fig. 4) piece number 7-1～7-8 with plate among 12AlMoV or the 12Cr2AlMoV, finish through manufacturing process such as shearing, punching press, flanging, welding.

6. adopt 12AlMoV or 12Cr2AlMoV sheet material through being welded as claims 1 described line of pipes (Fig. 7), welded tube can be three kinds of spiral, straight-line joint type and splicing welding joints etc.

7. adopt 12AlMoV or 12Cr2AlMoV steel sheet or thin steel band impact briquetting as sharp claim 1 described inner-tower filling material goods (Fig. 1 spare 6, part 8 and Fig. 5, Fig. 6), wherein the steel band of δ=0.1～0.3mm thickness is adopted in structured packing, the random packing steel band of δ=0.4～1.2mm thickness.

8. select the welding rod special for special that is complementary with it for corrosion resistance for use as claims 1,4,5,6 described wldings, promptly manual welding welds automatically and joins 431 solder flux with the H10MnSi welding wire with knot 507 molybdenum welding rods between the 12AlMoV steel of the same race; Manual welding welds automatically and joins 350 solder flux with the H08CrMoVA welding wire, the weld preheating postweld heat treatment with hot 317 welding rods between the 12Cr2AlMoV steel of the same race.

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