CN112359276A - Low-cost moisture-resistant hydrogen sulfide corrosion-resistant steel, and preparation method and application thereof - Google Patents
Low-cost moisture-resistant hydrogen sulfide corrosion-resistant steel, and preparation method and application thereof Download PDFInfo
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- 229910000037 hydrogen sulfide Inorganic materials 0.000 title claims abstract description 36
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 title claims abstract description 33
- 239000010935 stainless steel Substances 0.000 title claims description 6
- 238000002360 preparation method Methods 0.000 title abstract description 5
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 106
- 239000010959 steel Substances 0.000 claims abstract description 106
- 230000007797 corrosion Effects 0.000 claims abstract description 36
- 238000005260 corrosion Methods 0.000 claims abstract description 36
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 27
- 238000009749 continuous casting Methods 0.000 claims abstract description 14
- 238000003723 Smelting Methods 0.000 claims abstract description 13
- 229910052742 iron Inorganic materials 0.000 claims abstract description 13
- 238000005096 rolling process Methods 0.000 claims abstract description 12
- 238000007670 refining Methods 0.000 claims abstract description 9
- 238000009489 vacuum treatment Methods 0.000 claims abstract description 7
- 238000004519 manufacturing process Methods 0.000 claims description 21
- 238000003466 welding Methods 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 9
- 229910052782 aluminium Inorganic materials 0.000 claims description 8
- 229910052717 sulfur Inorganic materials 0.000 claims description 8
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 6
- 239000011593 sulfur Substances 0.000 claims description 6
- 229910052750 molybdenum Inorganic materials 0.000 claims description 5
- 229910052758 niobium Inorganic materials 0.000 claims description 5
- 239000000126 substance Substances 0.000 claims description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 229910052802 copper Inorganic materials 0.000 claims description 4
- 229910052719 titanium Inorganic materials 0.000 claims description 4
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 229910052759 nickel Inorganic materials 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 229910052698 phosphorus Inorganic materials 0.000 claims description 3
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 3
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 3
- 239000002893 slag Substances 0.000 claims description 3
- 229910052791 calcium Inorganic materials 0.000 claims description 2
- 229910052804 chromium Inorganic materials 0.000 claims description 2
- 229910052748 manganese Inorganic materials 0.000 claims description 2
- 229910052710 silicon Inorganic materials 0.000 claims description 2
- 238000006555 catalytic reaction Methods 0.000 claims 1
- 239000000470 constituent Substances 0.000 claims 1
- 238000002407 reforming Methods 0.000 claims 1
- 239000010865 sewage Substances 0.000 claims 1
- 229910000851 Alloy steel Inorganic materials 0.000 abstract description 4
- 238000006477 desulfuration reaction Methods 0.000 description 12
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 2
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 2
- 229910020012 Nb—Ti Inorganic materials 0.000 description 2
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- 238000000137 annealing Methods 0.000 description 2
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- 238000004804 winding Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000599 Cr alloy Inorganic materials 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000004925 denaturation Methods 0.000 description 1
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- 238000013461 design Methods 0.000 description 1
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- 230000002708 enhancing effect Effects 0.000 description 1
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- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 1
- 230000024121 nodulation Effects 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
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- 239000003208 petroleum Substances 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- 238000005292 vacuum distillation Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/04—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of bars or wire
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
- B23K35/3053—Fe as the principal constituent
- B23K35/308—Fe as the principal constituent with Cr as next major constituent
- B23K35/3086—Fe as the principal constituent with Cr as next major constituent containing Ni or Mn
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/40—Making wire or rods for soldering or welding
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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Abstract
The invention relates to the field of low alloy steel, in particular to low-cost steel for resisting wet hydrogen sulfide corrosion, a preparation method and application thereof, and the low-cost steel comprises 0.07-0.10% of C, 0.17-0.30% of Si, 0.35-0.50% of Mn, 0.35-0.50% of Cr, 0.15-0.25% of Mo, 0.010-0.045% of Ni, less than or equal to 0.020% of Cu, 0.010-0.025% of Al, 0.010-0.020% of Ti, 0.035-0.045% of Nb, less than or equal to 0.003% of S, less than or equal to 0.012% of P, less than or equal to 0.0010% of Ca and the balance of Fe. The steel for resisting wet hydrogen sulfide corrosion is obtained through molten iron pretreatment, converter smelting, LF refining, RH vacuum treatment, continuous casting and continuous rolling. The moisture-resistant hydrogen sulfide uniform corrosion rate V of the steel is less than or equal to 1.55, and the steel has good mechanical properties.
Description
Technical Field
The invention relates to the field of alloy steel, in particular to a low-cost steel wire rod, a steel bar, a steel pipe and a welding wire for resisting wet hydrogen sulfide corrosion, and a preparation method and application thereof.
Background
Energy problems are becoming more and more serious at present, and with the mass exploitation of petroleum and coal, particularly the exploitation of high hydrogen sulfide oil fields and coal mines, the content of hydrogen sulfide in fuel is becoming higher and higher, so that combustion or heat exchange system equipment suffers from serious corrosion. For example, an economizer made of 10g low carbon steel, is not operated for one cycle due to corrosion. The corrosion of the oil field equipment by the hydrogen sulfide is mainly concentrated in crude oil gathering and transportation devices and petrochemical equipment. For example, a three-phase separator, a gas-liquid separator, a crude oil heater and a part of gathering and transportation pipelines of the gathering and transportation station have a severe hydrogen sulfide corrosion phenomenon. To solve the problem of wet hydrogen sulfide (water and dew below dew point)And H2S coexisting), researchers at home and abroad have proposed to design rare earth-containing alloy steels with good welding performance and corrosion resistance, such as steels for resisting wet hydrogen sulfide corrosion, including 07Cr2AlMo, 07C r2AlMoRE, 09Cr2AlMoRE, 08Cr2AlMo, and the like, on the basis of Cr2-Al-Mo alloy.
In the prior art, Cr2-Al-Mo alloy steel materials with high Cr (2.0-2.5%), high Al (0.30-0.70%) and containing Mo (0.30-0.40%) precious alloy are generally adopted, the steel grade has high production cost due to high Cr, Al and Mo alloy elements, the smelting process of the steel grade is difficult to control due to high Al content in molten steel, the molten steel is often formed in continuous casting to form nodules to block a water gap, the production efficiency is low, the surface quality of rolled materials is poor, and billets and steel bars need to be scalded.
Disclosure of Invention
In order to solve the technical problems of high cost and complex production process of the traditional Cr2-Al-Mo steel for resisting wet hydrogen sulfide corrosion in the prior art, the invention adopts an Al-Nb-Ti microalloying means and applies the precise proportion of Cr-Ni-Al-Nb-Ti elements of the steel and smelting and rolling processes. The steel does not need to be added with a large amount of noble Mo element and Cr element, and a micro alloying means of trace Al, Nb, Ti and other elements is adopted, so that the wet hydrogen sulfide corrosion resistance of the steel achieves an ideal effect, and the steel has good mechanical properties. And the production cost of the steel is greatly reduced, and the production efficiency is greatly improved.
The technical scheme adopted by the invention is as follows: the low-cost wet-hydrogen sulfide corrosion-resistant steel comprises the following components of C, Si, Mn, Cr, Cu, Ni, Al, Ti, Mo, Nb, S, P, Ca and Fe;
the low-cost wet-hydrogen sulfide corrosion-resistant steel comprises the following chemical components in percentage by weight: 0.07-0.10% of C, 0.17-0.30% of Si, 0.35-0.50% of Mn, 0.35-0.50% of Cr, 0.15-0.25% of Mo, 0.010-0.045% of Ni, less than or equal to 0.020% of Cu, 0.010-0.025% of Al, 0.010-0.020% of Ti, 0.035-0.045% of Nb, less than or equal to 0.003% of S, less than or equal to 0.012% of P, less than or equal to 0.0010% of Ca and the balance of Fe.
Wherein the content of the first and second substances,
c: the carbon content is controlled to the minimum to improve the welding performance and corrosion resistance of the material.
As the C content increases, the strength and hardness of the steel increase, but the weldability of the steel decreases. Therefore, the C content is limited to 0.07-0.010%.
Si: ferrite can be dissolved in steel, so that the strength and hardness of alloy steel can be improved, and the plasticity and toughness of the steel can be reduced. Therefore, the Si content is designed to be 0.17 to 0.30%.
Ti: the element is an element which forms a precipitate and is effective for strengthening and toughening, and can refine crystal grains, so that the internal structure of the steel is compact, the aging sensitivity and the cold brittleness are reduced, the surface structure and the crystal grains of the steel are refined, and the longitudinal cracks on the surface of the continuous casting billet are prevented. Therefore, the Ti content is designed to be 0.010-0.020%.
Al: the grain can be refined, the impact toughness can be improved, but the hot workability, the welding performance and the like of the steel can be influenced by the high content of the iron, and the smelting, the pouring and the like are difficult. The Al remaining for deoxidation can improve the oxidation resistance and refine the crystal grains of the steel, so as to reduce the oxygen content in the steel and improve the purity of the molten steel. Therefore, the Al content is designed to be 0.010-0.025%.
Mn: ferrite is dissolved in steel to reinforce the matrix, pearlite can be refined during cooling after rolling, and the pearlite content can be relatively increased, so that strength and hardness can be increased, and the plastic property of the material is less affected. When the Mn content is less than 0.30%, the mechanical property of the material can not meet the strength requirement, and when the Mn content is more than 0.50%, the brittleness of the material is increased. Therefore, the Mn element content is designed to be 0.30-0.50%.
Cr: the Cr element is added into the low-carbon steel, but the welding performance and the plasticity are reduced. Therefore, the Cr content is designed to be 0.30-0.50%.
S: in order to ensure the reliability of the pressure container, the S content is strictly controlled, which has great effect on improving the stress corrosion resistance of the material. Therefore, the S content is designed to be less than or equal to 0.003 percent.
Ni is used for refining ferrite grains and enhancing the hardening performance of steel; the quenching temperature during heat treatment can be reduced, so that the deformation during heat treatment is small; the ductility and toughness, especially the low-temperature toughness of the steel can be improved; can improve the heat strength and corrosion resistance of the steel. Considering that this element is a precious alloy element. Therefore, the Ni content is designed to be 0.010-0.045%.
Nb: the element is a strong carbide forming element, can increase the temperature of a non-recrystallization area, and plays the roles of grain refinement and precipitation strengthening. The method can reduce the overheating sensitivity and the tempering brittleness of steel and improve the strength, and particularly, the method can prevent crystal grains from growing when heating before quenching, refine the crystal grains and help to reduce the carbide amount on the crystal grain boundary, thereby improving the toughness to avoid the brittle cracking caused by local high stress, but the plasticity and the toughness are reduced to some extent due to overhigh content, and crack defects are easily caused. Therefore, the content of Nb is designed to be 0.03-0.04%.
Mo: the molybdenum can prevent austenite grains from being coarse, and the molybdenum can improve the hardness and strength of the alloy steel at normal temperature and obviously improve the high-temperature strength and corrosion resistance of the steel. Considering that this element is a precious alloy element. Therefore, the Mo element content is designed to be 0.15-0.25%.
P is one of harmful elements in steel, and is mainly dissolved in ferrite to play a strengthening role. The phosphorus content is increased, the strength and the hardness of the steel are improved, but the plasticity and the toughness are obviously reduced, and the welding performance of the steel is influenced. Therefore, the content of P element is designed to be less than or equal to 0.012 percent.
Ca: the method can control the form and composition of inclusions in the steel, improve the mechanical property and the cutting property of the steel, and ensure that the content of the Ca element in the steel is mainly the residue of the molten steel in deoxidation and denaturation treatment. Therefore, the content of P element is designed to be less than or equal to 0.0010 percent.
In order to ensure the moisture and hydrogen sulfide corrosion resistance of steel, the types and contents of alloy elements need to be strictly designed, and continuous casting nodulation and water blocking are easily caused when the adding amount of aluminum is large, so that continuous casting is stopped; niobium easily causes cracks in the cast blank, and then the cracks are transferred to the surface of the product. The composite action effects of microalloying, precipitation strengthening and the like of Ni, Al, Ti, Mo and Nb in steel are the optimal combination obtained through theoretical calculation and laboratory tests for many times. The steel can be ensured to be manufactured into products of steel bars, wire rods, steel pipes and welding wires, the products are ensured to have high temperature resistance and moisture and hydrogen sulfide corrosion resistance, and meanwhile, the production and manufacturing cost of the steel is lower.
The preparation method of the steel bar and the wire rod comprises the following steps: according to the target steel composition, the traditional smelting process is adopted: KR molten iron pretreatment (desulfurization, dephosphorization) → converter smelting (decarburization, desulfurization) → LF refining (component adjustment, desulfurization, and inclusion removal) → RH vacuum treatment (deep desulfurization, degassing) → continuous casting, and a continuous cast slab is obtained.
(1) KR molten iron treatment, pre-desulfurization, controlling the sulfur in the molten iron to be less than or equal to 0.0030 percent;
(2) smelting in a converter, and carrying out dephosphorization and primary component adjustment;
(3) LF refining, namely deoxidizing and finely adjusting components in an LF furnace; deoxidizing the slag surface by adopting aluminum particles or silicon carbide, and strictly prohibiting adopting a Ca-containing deoxidizing material;
(4) RH vacuum treatment, deep desulfurization, controlling the sulfur in the molten steel to be less than or equal to 0.003%;
(5) continuous casting, namely casting a continuous casting blank on a continuous casting machine;
(6) and (4) continuous rolling, namely rolling the steel bar into a bar or a wire rod in a continuous rolling unit.
And manufacturing the bar into a seamless steel tube by adopting a traditional tube manufacturing process. Steel bar blanking → heating → perforation → acid washing → annealing → cold drawing → heat treatment (normalizing) → finished steel pipe.
And manufacturing the wire rod into the welding wire by adopting a traditional welding wire manufacturing process. Wire rod → pretreatment of wire drawing (shell pulling, boronizing, etc.) → rough wire drawing → fine wire drawing → copper plating → fine winding → finished wire.
The low-cost steel for resisting wet hydrogen sulfide corrosion, prepared by the invention, is used for seamless steel tubes and welding wires for equipment such as heat exchangers resisting wet hydrogen sulfide corrosion in various petrochemical industries. Wherein, the heat exchanger is a heat exchanger of a primary distillation tower of an atmospheric and vacuum distillation device of the oil refining device, or a heat exchanger of a fractionating tower and an absorption stabilizing tower of a catalytic system.
The invention has the beneficial effects that:the components of the steel are uniquely designed and controlled, so that the wet hydrogen sulfide corrosion resistance and the welding performance of the steel are good and are superior to those of Cr2-Al-Mo series steel, and the uniform corrosion rate V of the wet hydrogen sulfide is less than or equal to 1.55 (the corrosion rate unit is 10: 10)-2mg/cm2h; at 1000ppmH2S, soaking for 150 hours in an environment at 100 ℃). And the surface crack defect of the steel is avoided, the delivery of the black skin of the steel can be realized, the yield and the production efficiency of the steel are greatly improved, the production cost is low, and the peeling production cost of the steel billet or the bar material is saved by about 200 yuan/ton. Tests and tests show that the wet hydrogen sulfide corrosion resistance of the steel can reach, Cr2-Al-Mo series steel can be completely replaced, the alloy cost of the steel of the invention is about 500 yuan/ton lower than that of the traditional Cr2-Al-Mo series steel, and the production efficiency is improved by about 20%. The comprehensive cost is about 1000 yuan/ton lower than that of Cr2-Al-Mo series steel.
Drawings
FIG. 1 is a photograph of the surface of a steel material in example 1 of the present invention;
FIG. 2 is a photograph of the surface of a steel material of comparative example 1 of the present invention.
Detailed Description
The present invention is further described below with reference to examples, but is not limited thereto.
Examples of the implementation
According to the chemical composition of the steel in the table 1 of the invention, the traditional smelting process flow is adopted: KR molten iron pretreatment (desulfurization, dephosphorization) → converter smelting (decarburization, desulfurization) → LF refining (component adjustment, desulfurization, and inclusion removal) → RH vacuum treatment (deep desulfurization, degassing) → continuous casting → continuous rolling (wire rod, steel bar), and 160 × 160mm continuous cast slab was obtained.
In the invention, a 120-ton converter is adopted for smelting raw materials, and 130-ton LF and RH vacuum furnaces are adopted for refining.
(1) KR molten iron treatment, pre-desulfurization, controlling the sulfur in the molten iron to be less than or equal to 0.0030 percent;
(2) smelting in a converter, and carrying out dephosphorization and primary component adjustment;
(3) LF refining, namely deoxidizing and finely adjusting components in an LF furnace; deoxidizing the slag surface by adopting aluminum particles or silicon carbide;
(4) RH vacuum treatment, deep desulfurization, controlling the sulfur in the molten steel to be less than or equal to 0.003%;
(5) continuously casting, namely casting a continuous casting billet 160 x 160mm on a continuous casting machine;
(6) continuous rolling, namely rolling into phi 50mm round steel on a small bar continuous rolling production line; phi 5.5mm wire rod is rolled in a high-speed wire production line.
(7) Phi 50mm round steel bar is manufactured into a seamless steel tube by adopting the traditional tube manufacturing process. Steel bar blanking → heating → perforation → acid washing → annealing → cold drawing → heat treatment (normalizing) → finished steel pipe.
(8) Phi 5.5mm wire rods are manufactured into welding wires by adopting a traditional welding wire manufacturing process. Wire rod → pretreatment of wire drawing (shell pulling, boronizing, etc.) → rough wire drawing → fine wire drawing → copper plating → fine winding → finished wire.
The chemical composition of the steel is as follows in table 1:
| furnace number | C | Si | Mn | P | S | Cr | Ni | Cu | Mo | Al | Ca | Ti | Nb |
| 1 | 0.091 | 0.249 | 0.436 | 0.011 | 0.001 | 0.422 | 0.022 | 0.017 | 0.178 | 0.013 | 0.0008 | 0.0124 | 0.034 |
| 2 | 0.096 | 0.250 | 0.459 | 0.010 | 0.001 | 0.425 | 0.015 | 0.015 | 0.177 | 0.012 | 0.0007 | 0.0117 | 0.035 |
| 3 | 0.097 | 0.245 | 0.455 | 0.010 | 0.001 | 0.422 | 0.020 | 0.015 | 0.179 | 0.011 | 0.0009 | 0.0112 | 0.035 |
| 4 | 0.092 | 0.249 | 0.436 | 0.009 | 0.001 | 0.426 | 0.028 | 0.017 | 0.180 | 0.013 | 0.0008 | 0.0124 | 0.035 |
| 5 (comparative example 1) | 0.097 | 0.245 | 0.455 | 0.010 | 0.001 | 0.422 | 0.020 | 0.280 | 0.179 | 0.011 | 0.0009 | 0.0112 | 0.035 |
| 6 (comparative example 2) | 0.097 | 0.245 | 0.455 | 0.010 | 0.001 | 0.422 | 0.020 | 0.015 | 0.179 | 0.011 | 0.0015 | 0.0112 | 0.035 |
| 7 (comparative example 3) | 0.091 | 0.249 | 0.436 | 0.011 | 0.001 | 0.422 | 0.022 | 0.017 | 0.178 | 0.013 | 0.0008 | 0.0124 | 0.014 |
| 8 (comparative example 4) | 0.091 | 0.249 | 0.436 | 0.011 | 0.001 | 0.422 | 0.022 | 0.017 | 0.178 | 0.013 | 0.0008 | 0.0024 | 0.034 |
The moisture hydrogen sulfide corrosion resistance of steel rods, steel pipes, wire rods and welding wires prepared from the above 8-furnace steel (wherein, the 5 th, 6 th, 7 th and 8 th furnaces are comparative examples) was measured at 1000ppmH2S, soaking for 150 hours in an environment with the temperature of 100 ℃, and concretely referring to table 2. The mechanical properties of the steel are shown in table 3 below:
table 2: resistance of steel to wet hydrogen sulfide corrosion
Table 3: mechanical properties of steel
Steel bar, steel pipe, wire rod and welding wire product prepared by steel gradeThe moisture and hydrogen sulfide corrosion resistance of the product reaches or is superior to that of the 09Cr2AlMoRE steel grade, and the 09Cr2AlMoRE steel grade is publicly reported to be 998ppmH2S, soaking for 144h in a 100 ℃ corrosion environment, and uniformly corroding at a rate V (10)-2mg/cm2h) Is 1.58.
The present invention is not limited to the above-described embodiments, and any obvious improvements, substitutions or modifications can be made by those skilled in the art without departing from the spirit of the present invention.
Claims (5)
1. A low-cost steel for resisting wet hydrogen sulfide corrosion is characterized in that the constituent elements of the low-cost steel for resisting wet hydrogen sulfide corrosion are C, Si, Mn, Cr, Mo, Ni, Cu, Al, Ti, Nb, S, P, Ca and Fe; the low-cost wet-hydrogen sulfide corrosion resistant steel comprises the following chemical components in percentage by weight: 0.07-0.10% of C, 0.17-0.30% of Si, 0.35-0.50% of Mn, 0.35-0.50% of Cr, 0.15-0.25% of Mo, 0.010-0.045% of Ni, less than or equal to 0.020% of Cu, 0.010-0.025% of Al, 0.010-0.020% of Ti, 0.035-0.045% of Nb, less than or equal to 0.003% of S, less than or equal to 0.012% of P, less than or equal to 0.0010% of Ca and the balance of Fe.
2. The low-cost steel for resisting wet hydrogen sulfide corrosion according to claim 1, wherein the uniform corrosion rate V of the steel for resisting wet hydrogen sulfide corrosion is not more than 1.5510-2mg/cm2h。
3. The method for preparing the low-cost steel for resisting wet hydrogen sulfide corrosion according to claim 1, wherein the method comprises the following steps:
(1) performing KR molten iron pretreatment → converter smelting → LF refining → RH vacuum treatment to obtain a continuous casting billet;
(2) rolling the continuous casting billet by a continuous rolling mill set to obtain a steel bar or a wire rod;
(3) the steel bar is threaded into a capillary on a pipe threading machine and is cold-drawn into a finished steel pipe; or the wire rod is arranged on a welding wire production line to prepare the finished welding wire.
4. The method for preparing the low-cost wet hydrogen sulfide corrosion resistant steel according to claim 3, wherein the pretreatment of the molten iron in the step (1) controls the sulfur in the molten iron to be less than or equal to 0.0030%; smelting in a converter, and carrying out dephosphorization and primary component adjustment; deoxidizing and finely adjusting components in an LF furnace; deoxidizing the slag surface by adopting aluminum particles or silicon carbide; RH vacuum treatment is carried out, deep desulphurization is carried out, and the sulfur in the molten steel is controlled to be less than or equal to 0.003 percent.
5. The use of the low-cost steel for resisting wet hydrogen sulfide corrosion according to claim 1, wherein the low-cost steel for resisting wet hydrogen sulfide corrosion is used for manufacturing seamless steel tubes and welding wires for atmospheric and vacuum pressure, catalysis, reforming, sewage stripping, heat exchangers and air coolers in the petrochemical industry.
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