JP2013185197A - Steel product for hydrogen sulfide environment excellent in hydrogen absorption resistance, and steel structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide: a steel product for a hydrogen sulfide environment, capable of being suitably used for line pipes or the like transporting crude oil, natural gas and the like which contain hydrogen sulfide, and excellent in hydrogen absorption resistance; and a steel structure.SOLUTION: A steel product includes 0.01-0.20% of C, 0.01-0.50% of Si, 0.1-2.0% of Mn, 0.015% or less (excluding 0%) of P, 0.03% or less (excluding 0%) of S, 0.005-0.10% of Al, and 0.05-1.0% of Cu, as well as 0.001-0.050% of Sn and/or 0.001-0.050% of Sb, with the remainder comprising Fe and inevitable impurities, while a ratio of [Cu]/([Sn]+[Sb]) is 1.0-30.0.

Description

The present invention relates to a hydrogen sulfide environmental steel material excellent in hydrogen absorption resistance, which is optimal for use as a line pipe for transporting crude oil or natural gas containing hydrogen sulfide (H ₂ S), or a pressure vessel, and the like. The present invention relates to a steel structure exposed to a hydrogen sulfide atmosphere such as a line pipe constructed using the steel material or a pressure vessel.

  In steel structures used in atmospheres containing hydrogen sulfide, such as line pipes for transporting crude oil, natural gas, etc., oil refineries (hydrorefining equipment, hydrodesulfurization equipment, catalytic cracking equipment, etc.) Hydrogen embrittlement such as induced cracking (HIC) and sulfide stress corrosion cracking (SSCC) may occur, which is often a safety issue.

  These cracks in steel materials such as hydrogen-induced cracking and sulfide stress corrosion cracking are caused by hydrogen sulfide being absorbed in the steel material in large quantities and accumulated at the interface between inclusions such as MnS in the steel material and the base material. It is thought that the generated hydrogen is generated due to the gas pressure when it becomes molecular hydrogen. The occurrence of these cracks leads to the problem of crude oil, natural gas, etc. leaking from the steel structure used in an atmosphere containing hydrogen sulfide, which may cause a major accident. Therefore, from the viewpoint of ensuring the safety of line pipes, pressure vessels, and the like for transporting crude oil, natural gas, and the like, prevention of cracking of steel materials has become a very important technical issue.

  Conventionally, the following known techniques have been conventionally used as countermeasure techniques for preventing the occurrence of hydrogen embrittlement such as hydrogen-induced cracking and sulfide stress corrosion cracking.

(1) By reducing S in the steel material, the amount of MnS in the steel material serving as a crack starting point is reduced.
(2) By adding Ca to the steel material, the inclusions such as MnS are controlled to form inclusions that are difficult to break.
(3) By performing controlled rolling and accelerated cooling after rolling, the structure of the steel material is made uniform and the resistance to hydrogen embrittlement is increased.

  However, even if these measures are taken, it is still not sufficient to prevent the occurrence of hydrogen embrittlement, and hydrogen-induced cracking and sulfide stress corrosion cracking may still occur in steel materials. There is also such a situation, and as a technique for further countermeasures, according to Patent Document 1, a technique for improving hydrogen embrittlement resistance by controlling inclusions in an electric resistance welded portion is disclosed in Patent Document 2, Technologies for improving the resistance to hydrogen embrittlement by suppressing the increase in the maximum hardness of the central segregation part by reducing the segregation degree of specific components (Mn, Nb, Ti) in steel materials have been proposed. However, the technique described in Patent Document 1 is a technique for improving the hydrogen embrittlement resistance of only the welded portion, and the technique described in Patent Document 2 has a problem that it is difficult to control and is not practical.

  Moreover, judging only from the viewpoint of improving the corrosion resistance of the steel material, Patent Documents 3 to 5 propose a technique for improving the corrosion resistance by adding Sn or Sb to the steel material. However, these techniques described in Patent Documents 3 to 5 are not developed from the viewpoint of preventing the occurrence of hydrogen embrittlement in a steel structure used in an atmosphere containing hydrogen sulfide. From the viewpoint of improving the hydrogen embrittlement resistance of a steel structure used in an atmosphere containing hydrogen sulfide, the technology was not sufficient.

  In recent years, in oil field development and gas field development, there has been a tendency for a more severe environment containing more hydrogen sulfide to increase, and it has not always been sufficient to take measures only with the conventional technology. In order to more efficiently transport crude oil, natural gas, and the like in a pipeline, it is effective to increase the pressure of the line pipe and the like, and in particular, there is a need for adopting a high-strength material in the line pipe. However, increasing the strength of steel will conversely increase the hydrogen embrittlement susceptibility of the steel, and if the strength of the steel is increased, hydrogen-induced cracking, sulfide stress corrosion cracking, etc. There was a contradictory problem that embrittlement was likely to occur.

JP 2011-26695 A JP 2010-209461 A JP 2011-202215 A JP 2008-174768 A JP 2007-26558 A

  The present invention has been made as a solution to the above-described conventional problems, and has a hydrogen absorption resistance that can be suitably used as a line pipe for transporting crude oil or natural gas containing hydrogen sulfide, or a pressure vessel. An object of the present invention is to provide an excellent steel material for hydrogen sulfide environment and a steel structure constructed using the steel material for hydrogen sulfide environment.

Invention of Claim 1 is the mass%, C: 0.01-0.20%, Si: 0.01-0.50%, Mn: 0.1-2.0%, P: 0.015 %: Not more than 0 (not including 0%), S: not more than 0.03% (not including 0%), Al: 0.005 to 0.10%, Cu: 0.05 to 1.0% , Sn: 0.001 to 0.050%, and / or Sb: 0.001 to 0.050%, with the balance being Fe and inevitable impurities, [Cu] / ([Sn] + [ The value obtained from Sb]) is 1.0 to 30.0, and is a steel material for hydrogen sulfide environment excellent in hydrogen absorption resistance.
However, in the above formula, [] is the content (% by mass) of each element.

  The invention according to claim 2 further includes, in mass%, one of Mg: 0.0005 to 0.005%, Ca: 0.0005 to 0.010%, REM: 0.0001 to 0.020%, or The steel material for hydrogen sulfide environment excellent in hydrogen absorption resistance according to claim 1, containing two or more kinds.

  The invention according to claim 3 further comprises, in mass%, one of Ni: 0.01 to 1.0%, Cr: 0.01 to 1.0%, Mo: 0.01 to 0.30%, or The steel material for hydrogen sulfide environment excellent in hydrogen absorption resistance according to claim 1 or 2 containing two or more.

  The invention according to claim 4 further includes, in mass%, Nb: 0.001 to 0.1%, Ti: 0.001 to 0.1%, Zr: 0.001 to 0.1%, V: 0. It has excellent hydrogen absorption resistance according to any one of claims 1 to 3, characterized by containing one or more of 0.001 to 0.1% and B: 0.0001 to 0.005%. It is a steel material for hydrogen sulfide environment.

  The invention according to claim 5 is the steel material for hydrogen sulfide environment excellent in hydrogen absorption resistance according to any one of claims 1 to 4, which is used as a material for building a line pipe.

  Invention of Claim 6 is a steel structure exposed to a hydrogen sulfide atmosphere, Comprising: It is constructed using the steel material in any one of Claims 1 thru | or 4, It is a steel structure characterized by the above-mentioned. is there.

  According to the hydrogen sulfide environmental steel material having excellent hydrogen absorption resistance according to the present invention, even when used as a line pipe for transporting crude oil or natural gas containing hydrogen sulfide or a pressure vessel, it is resistant to hydrogen sulfide atmosphere. Because of its excellent hydrogen absorption, hydrogen embrittlement such as hydrogen induced cracking and sulfide stress corrosion cracking is unlikely to occur, and it is suitable as a material for steel structures such as line pipes and pressure vessels used in atmospheres containing hydrogen sulfide. Can be used.

  Further, the steel structure of the present invention is excellent in hydrogen absorption resistance in an atmosphere containing hydrogen sulfide, so it is used as a line pipe for transporting crude oil or natural gas containing hydrogen sulfide, or a pressure vessel. However, hydrogen embrittlement such as hydrogen induced cracking and sulfide stress corrosion cracking is unlikely to occur.

  Hereinafter, the present invention will be described in more detail based on embodiments.

  In order to improve the hydrogen embrittlement resistance of steel materials, the present inventors focused on the fact that hydrogen absorption into the steel material, which is the root cause of hydrogen embrittlement, should be suppressed. A technical study was conducted to improve the characteristics.

  On the surface of the steel material exposed to the hydrogen sulfide atmosphere, an electrochemical reaction in which hydrogen ions become hydrogen gas occurs as a corrosion reaction, and the adsorbed hydrogen generated in this intermediate process is absorbed into the steel material. When the inventors appropriately control the addition amount (content) and addition ratio (content ratio) of Cu, Sn, and Sb added to the steel material, the electrochemical reaction in which hydrogen ions become hydrogen gas is suppressed. As a result, it has been found that hydrogen absorption into the steel material can be significantly suppressed. It is considered that such an effect of suppressing the absorption of hydrogen into the steel material is manifested by forming a compound of Cu, Sn, and Sb on the surface of the steel material in a hydrogen sulfide atmosphere. That is, it has been found that the above-mentioned problems can be solved by appropriately controlling the addition amount and addition ratio of Cu, Sn, and Sb added to the steel material.

  Moreover, in order to ensure the basic characteristics (mechanical characteristics and weldability) necessary for steel as a structural material, in addition to the above-described Cu, Sn, Sb, C, Si, Mn, Al, P, S It is also necessary to adjust the addition amount (content) appropriately. The reason for limiting the component ranges of these essential additive elements will be described below. All units are described as%, but indicate mass%. In the following explanations other than the essential additive elements,% indicates mass% in the same manner.

C: 0.01-0.20%
C is a basic additive element necessary for securing the strength of the steel material. In order to obtain the strength required as a steel material, it is necessary to contain at least 0.01% or more. However, when C is contained excessively, toughness deteriorates. In order not to cause such an adverse effect due to the addition of C, the C content needs to be suppressed to 0.20% at most. Therefore, the content range of C is set to 0.01 to 0.20%. In addition, the minimum with preferable content of C is 0.02%, More preferably, it is good to set it as 0.03% or more. Moreover, the upper limit with preferable content of C is 0.19%, More preferably, it is good to set it as 0.18% or less.

・ Si: 0.01-0.50%
Si is also an element necessary for deoxidation and ensuring strength, and unless it is contained at least 0.01% or more, the minimum strength as a steel material used as a structural member cannot be ensured. However, if the content exceeds 0.50%, the weldability deteriorates. In addition, the minimum with preferable content of Si is 0.03%, It is good to set it as 0.05% or more more preferably. Moreover, the upper limit with preferable content of Si is 0.45%, It is good to set it as 0.40% or less more preferably.

Mn: 0.1 to 2.0%
Like Si, Mn is an element necessary for deoxidation and securing strength, and if it is less than 0.1%, the minimum strength as a steel material used as a structural member cannot be secured. However, if the content exceeds 2.0%, the toughness deteriorates. In addition, the minimum with preferable content of Mn is 0.15%, More preferably, it is good to set it as 0.2% or more. Moreover, the upper limit with preferable Mn content is 1.9%, More preferably, it is good to set it as 1.8% or less.

・ P: 0.015% or less (excluding 0%)
In addition to being an element that increases the amount of hydrogen absorbed by steel, P is an element that also deteriorates toughness, and is an undesirable element from the viewpoint of hydrogen embrittlement. Moreover, when P is contained excessively, weldability will also deteriorate. Therefore, it is preferable that P is not contained as much as possible, but the upper limit of the allowable content is 0.015%. The upper limit with more preferable content of P is 0.014%, More preferably, it is good to set it as 0.013% or less. However, it is difficult to make P in steel materials 0% industrially.

S: 0.03% or less (excluding 0%)
S is an element that deteriorates toughness when the content is increased, and is not preferable from the viewpoint of hydrogen embrittlement. Moreover, when S is added excessively, weldability will also deteriorate. Therefore, it is preferable that S is not contained as much as possible, but the upper limit of the allowable content is 0.03%. The upper limit with more preferable content of S is 0.025%, More preferably, it is good to set it as 0.02% or less. However, it is difficult to make P in steel materials 0% industrially.

-Al: 0.005-0.10%
Al is also an element necessary for deoxidation and securing strength, like Si and Mn described above. In order to exhibit such an action effectively, it is necessary to contain 0.005% or more. However, if the content exceeds 0.10%, weldability is impaired, so the Al content is limited to 0.10%. In addition, the minimum with preferable content of Al is 0.008%, More preferably, it is good to set it as 0.010% or more. Moreover, the upper limit with preferable content of Al is 0.09%, More preferably, it is good to set it as 0.08% or less.

Cu: 0.05 to 1.0%
Cu exhibits the effect of suppressing hydrogen absorption into the steel material by coexistence with Sn and Sb. In order to exhibit such an effect of suppressing hydrogen absorption, it is necessary to contain at least 0.05% or more. However, since excessive weldability deteriorates weldability and hot workability, the Cu content needs to be 1.0% or less. The minimum with preferable content of Cu is 0.06%, and a more preferable minimum is 0.07%. Moreover, the upper limit with preferable Cu content is 0.95%, and a more preferable upper limit is 0.90%.

Sn: 0.001 to 0.050% and / or Sb: 0.001 to 0.050%
Sn and Sb exhibit an effect of suppressing hydrogen absorption into the steel material by being contained in appropriate amounts together with Cu. In order to exert such a hydrogen absorption suppressing effect, it is necessary to contain 0.001% or more of each. However, if Sn and Sb are contained excessively, the hydrogen absorption into the steel material is promoted conversely, and weldability and hot workability are deteriorated. Therefore, each content is 0.050% or less. It is necessary to. As for Sn and Sb, the minimum with preferable content is both 0.002%, and a more preferable minimum is 0.003%. Moreover, the upper limit with preferable content is 0.048% in both, and a more preferable upper limit is 0.045%.

[Cu] / ([Sn] + [Sb]) is 1.0 to 30.0
In order to suitably use steel as a material for steel structures such as line pipes and pressure vessels used in an atmosphere containing hydrogen sulfide, the ratio of Cu content to Sn + Sb content needs to be adjusted appropriately. There is. These elements form a film that suppresses the electrochemical reaction of hydrogen absorption in a hydrogen sulfide atmosphere. When the ratio of [Cu] / ([Sn] + [Sb]) is less than 1.0, , Sn + Sb excess film is not obtained, and the effect of suppressing the electrochemical reaction of hydrogen absorption cannot be obtained. On the other hand, when the [Cu] / ([Sn] + [Sb]) ratio exceeds 30.0, a Cu-excess film is formed and the effect of suppressing the electrochemical reaction of hydrogen absorption cannot be obtained. For this reason, the [Cu] / ([Sn] + [Sb]) ratio needs to be 1.0 to 30.0. The more preferable lower limit of the [Cu] / ([Sn] + [Sb]) ratio is 1.2, and the more preferable upper limit is 28.0. In the above formula, [] is the content (% by mass) of each element.

  The above is the reason for limiting the component range of the essential additive elements of the steel material of the present invention, and the balance is Fe and inevitable impurities. Inevitable impurities include O, H and the like, and these elements may be contained to the extent that they do not impair various properties of the steel material. However, by suppressing the total content of these inevitable impurities to 0.1% or less, preferably 0.09% or less, the corrosion resistance effect according to the present invention can be maximized.

  It is more effective if the steel material of the present invention contains the following elements. The reason for limiting the component range when these elements are contained will be described below.

Mg: 0.0005-0.005%, Ca: 0.0005-0.010%, REM: 0.0001-0.020%
Mg, Ca, and REM have the effect of increasing the pH of the surface and lowering the hydrogen ion concentration that causes hydrogen absorption when the steel material is corroded and dissolved in a hydrogen sulfide atmosphere. It is an effective element for improving characteristics. Such an effect is effectively exhibited by containing 0.0005% or more of Mg and Ca and 0.0001% or more of REM. However, when these elements are contained excessively, both workability and weldability are deteriorated. In order not to deteriorate the workability and weldability, the upper limit of inclusion is required to be 0.005% for Mg, 0.010% for Ca, and 0.020% for REM. The more preferable lower limit in the case of containing Mg and Ca is 0.0006%, respectively, and the more preferable lower limit is 0.0008%. A more preferable lower limit in the case of containing REM is 0.0002%, and a further preferable lower limit is 0.0003%. On the other hand, the more preferable upper limit of the Mg content is 0.0048%, and the more preferable upper limit is 0.0045%. A more preferable upper limit of the Ca content is 0.0098%, and a more preferable upper limit is 0.0095%. The upper limit with more preferable content of REM is 0.019%, and a more preferable upper limit is 0.018%.

Ni: 0.01-1.0%
Ni has a function of forming a dense rust film on the surface of the steel material in addition to lowering the activity of the anode by solid solution in ferrite and exerts an effect of suppressing a hydrogen absorption reaction. Ni is also effective in improving the toughness of the base material, and is an element necessary for preventing red heat embrittlement due to Cu. In order to exhibit such an effect, it is preferable to make it contain 0.01% or more. However, if the content is excessive, weldability and hot workability are deteriorated. The more preferable lower limit when Ni is contained is 0.02%, and more preferably 0.03% or more. A more preferable upper limit when Ni is contained is 0.95%, and more preferably 0.90% or less.

・ Cr: 0.01-1.0%
Since Cr dissolves in ferrite and suppresses the corrosion reaction, it exhibits the effect of suppressing the hydrogen absorption reaction. In order to exhibit these effects, it is preferable to make it contain 0.01% or more, but if it contains excessively, weldability and hot workability will deteriorate. In order not to exert such adverse effects due to the Cr content, the content needs to be 1.0% or less. A more preferable lower limit of the Cr content is 0.03%, and more preferably 0.05% or more. The upper limit with more preferable content of Cr is 0.95%, and it is still more preferable to set it as 0.90% or less.

Mo: 0.01-0.30%
Since Mo also suppresses the corrosion reaction in the hydrogen sulfide atmosphere like Ni and Cr, it exhibits the effect of suppressing the reaction of hydrogen absorption. In order to exhibit these effects, it is preferable to make it contain 0.01% or more, but if it contains excessively, weldability and hot workability will deteriorate. In order not to exert such an adverse effect due to the Mo content, the content needs to be 0.30% or less. The minimum with more preferable content of Mo is 0.015%, and it is still more preferable to set it as 0.02% or more. The upper limit with more preferable content of Mo is 0.28%, and it is still more preferable to set it as 0.25% or less.

Nb: 0.001-0.1%, Ti: 0.001-0.1%, Zr: 0.001-0.1%, V: 0.001-0.1%, B: 0.0001 ~ 0.005%
Nb, Ti, Zr, V and B are effective elements for improving the strength. In order to contain these elements and exhibit the effect of improving the strength, it is necessary to contain 0.001% or more in the case of Nb, Ti, Zr, or V, and 0.0001% or more in the case of B. However, when these elements are contained excessively, the base material toughness deteriorates. Therefore, when Nb, Ti, Zr, and V are contained, 0.1% or less, and when B is contained, 0.005% or less It is necessary to. In addition, the more preferable lower limit in the case of containing Nb, Ti, Zr, and V is 0.002%, and the more preferable lower limit is 0.003%. Moreover, the more preferable upper limit in the case of containing Nb, Ti, Zr, and V is 0.095%, and a more preferable upper limit is 0.090%. The more preferable lower limit in the case of containing B is 0.0002%, and the more preferable lower limit is 0.0003%. Moreover, the more preferable upper limit in the case of containing B is 0.0045% or less, and a more preferable upper limit is 0.004%.

  In order to reliably manufacture the hydrogen sulfide environmental steel material excellent in hydrogen absorption resistance according to the present invention, for example, it may be manufactured by the method described below.

  First, for the molten steel that is discharged from the converter or electric furnace to the ladle, the RH vacuum degassing device is used to adjust the component composition specified in the present invention, and the temperature is adjusted for secondary refining. Do. Thereafter, the steel ingot may be formed by a normal casting method such as a continuous casting method or an ingot-making method. In order to secure the basic characteristics (mechanical characteristics and weldability) necessary for steel as a structural material, it is preferable to use killed steel as the deoxidation type, and more preferably Al killed steel is recommended. Is done.

  Subsequently, after heating the obtained steel ingot to 1000-1300 degreeC temperature range, it is preferable to hot-roll and process into a desired dimension shape. The end temperature of the hot rolling is controlled to 650 to 850 ° C., and the cooling rate from the end of the hot rolling to 500 ° C. is controlled within a range of 0.1 to 15 ° C./second or less to obtain a predetermined strength. Characteristics can be obtained.

  EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples. However, the present invention is not limited by the following examples, but may be appropriately modified within a range that can meet the purpose described above and below. Of course, it is possible to implement them, and they are all included in the technical scope of the present invention.

[Production of test materials]
Steel materials having various component compositions shown in Tables 1 and 2 were melted in a vacuum melting furnace to form a 20 kg steel ingot. The obtained steel ingot was heated to 1150 ° C. and then hot-rolled to obtain a steel material having a plate thickness of 10 mm. At this time, the hot rolling end temperature was appropriately adjusted in the range of 650 to 850 ° C., and the cooling rate from the end of hot rolling to 500 ° C. within the range of 0.1 to 15 ° C./second or less.

  A specimen having a size of 30 × 30 × 4 (mm) was cut out from the steel material, and the entire surface of all specimens was polished to SiC # 600 with a wet rotary grinder, and further washed with water and acetone. The one used for the test. In addition, a suspension hole of 3 mmφ was formed at the end of the specimen for suspension during the test.

[Hydrogen absorption test method]
A hydrogen absorption test in a hydrogen sulfide atmosphere was performed. After immersing the specimen in 5% sodium chloride + 0.5% acetic acid aqueous solution in which hydrogen sulfide gas was passed, the amount of hydrogen absorbed by the specimen was measured. In addition, the temperature of a test solution is 30 degreeC, and the immersion time of a test piece is 96 hours. The flow rate of the hydrogen sulfide gas to be vented was 100 mL / min. The amount of absorbed hydrogen after immersion of the test piece in an aqueous solution was measured by an inert gas melting method.

[Test results]
Table 3 shows the results of the hydrogen absorption test. The evaluation is No. containing no Cu, Sn and Sb. The amount of absorbed hydrogen was No. 1 based on the measurement result of the steel material of Comparative Example 1. No. 1 or less and 10.0 ppm or less is “◯”, and the measured absorbed hydrogen amount is No. 1. No. 1 or less and 5.0 ppm or less “◯ to ◎”, the measured absorbed hydrogen amount is No. 1. Those of 1/10 or less of 1 and 2.0 ppm or less are indicated by “◎” and evaluated as hydrogen sulfide environment steel materials excellent in hydrogen absorption resistance.

  No. 1-No. The amount of hydrogen in the steel absorbed by the specimen No. 7 exceeded 10.0 ppm, and the hydrogen absorption resistance was not sufficient. The reason is as follows. This is because the specimen No. 1 does not contain Cu, Sn and Sb. 2 and No. This is because the specimen No. 6 has too much P and Sn contents. No. 3 and no. This is because the specimens No. 4 and No. 4 have too little Cu and Sn contents, respectively. This is because the values obtained from [Cu] / ([Sn] + [Sb]) are out of the appropriate range for the test pieces of 4, 5, and 7. As a result, it is considered that a preferable film was not formed on the steel material surface, and the effect of suppressing hydrogen absorption was insufficient.

  On the other hand, No. 1 satisfying the requirements defined in the present invention. 8-No. The amount of hydrogen in the steel absorbed by the 37 specimens was 10.0 ppm or less, satisfying the evaluation criteria, and the result that the hydrogen absorption resistance was excellent was obtained. These corrosion resistances are considered that the film of the preferable form was formed in the steel material surface by controlling appropriately the addition amount and addition ratio of Cu, Sn, Sb, etc. which are added to steel materials. As described above, a steel material that satisfies the requirements defined in the present invention has excellent hydrogen absorption resistance and can be suitably used as a structural member having excellent hydrogen embrittlement characteristics in a hydrogen sulfide atmosphere.

Claims (6)

In mass%, C: 0.01 to 0.20%, Si: 0.01 to 0.50%, Mn: 0.1 to 2.0%, P: 0.015% or less (excluding 0%) ), S: 0.03% or less (excluding 0%), Al: 0.005 to 0.10%, Cu: 0.05 to 1.0%, and Sn: 0.001 to 0 0.050% and / or Sb: 0.001 to 0.050%, with the balance being Fe and inevitable impurities,
A steel material for hydrogen sulfide environment excellent in hydrogen absorption resistance, wherein a value obtained from [Cu] / ([Sn] + [Sb]) is 1.0 to 30.0.
However, in the above formula, [] is the content (% by mass) of each element.   Furthermore, it contains one or more of Mg: 0.0005 to 0.005%, Ca: 0.0005 to 0.010%, and REM: 0.0001 to 0.020% in mass%. The steel material for hydrogen sulfide environment excellent in hydrogen absorption resistance according to 1.   Furthermore, it contains one or more of Ni: 0.01 to 1.0%, Cr: 0.01 to 1.0%, and Mo: 0.01 to 0.30% in mass%. The steel material for hydrogen sulfide environment excellent in hydrogen absorption resistance according to 1 or 2.   Furthermore, by mass%, Nb: 0.001 to 0.1%, Ti: 0.001 to 0.1%, Zr: 0.001 to 0.1%, V: 0.001 to 0.1%, B: One or two or more of 0.0001 to 0.005% is contained, The steel material for hydrogen sulfide environment excellent in hydrogen absorption resistance according to any one of claims 1 to 3.   The steel material for hydrogen sulfide environment having excellent hydrogen absorption resistance according to any one of claims 1 to 4, wherein the steel material is excellent in hydrogen absorption resistance.   A steel structure exposed to a hydrogen sulfide atmosphere, wherein the steel structure is constructed using the steel material according to any one of claims 1 to 4.