US20140348695A1 - Low alloy steel - Google Patents
Low alloy steel Download PDFInfo
- Publication number
- US20140348695A1 US20140348695A1 US14/370,999 US201214370999A US2014348695A1 US 20140348695 A1 US20140348695 A1 US 20140348695A1 US 201214370999 A US201214370999 A US 201214370999A US 2014348695 A1 US2014348695 A1 US 2014348695A1
- Authority
- US
- United States
- Prior art keywords
- less
- content
- alloy steel
- low alloy
- haz
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 229910000851 Alloy steel Inorganic materials 0.000 title claims abstract description 44
- 239000012535 impurity Substances 0.000 claims abstract description 14
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 6
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 6
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 5
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 5
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 4
- 229910052796 boron Inorganic materials 0.000 claims abstract description 4
- 229910052802 copper Inorganic materials 0.000 claims description 6
- 229910052759 nickel Inorganic materials 0.000 claims description 6
- 229910052719 titanium Inorganic materials 0.000 claims description 6
- 229910052720 vanadium Inorganic materials 0.000 claims description 6
- 229910052804 chromium Inorganic materials 0.000 claims description 5
- 229910052758 niobium Inorganic materials 0.000 claims description 5
- 229910052750 molybdenum Inorganic materials 0.000 claims description 4
- 229910052739 hydrogen Inorganic materials 0.000 abstract description 30
- 239000001257 hydrogen Substances 0.000 abstract description 30
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 abstract description 22
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 abstract description 7
- 230000007797 corrosion Effects 0.000 abstract description 7
- 238000005260 corrosion Methods 0.000 abstract description 7
- 229910000037 hydrogen sulfide Inorganic materials 0.000 abstract description 7
- 238000005336 cracking Methods 0.000 abstract description 5
- 229910000831 Steel Inorganic materials 0.000 description 34
- 239000010959 steel Substances 0.000 description 34
- 230000007423 decrease Effects 0.000 description 12
- 239000011572 manganese Substances 0.000 description 11
- 239000000463 material Substances 0.000 description 10
- 150000002431 hydrogen Chemical class 0.000 description 8
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 8
- 239000011575 calcium Substances 0.000 description 7
- 239000010949 copper Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 7
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 7
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 6
- 239000011777 magnesium Substances 0.000 description 6
- 239000011651 chromium Substances 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 239000010936 titanium Substances 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 239000010779 crude oil Substances 0.000 description 4
- 230000002708 enhancing effect Effects 0.000 description 4
- 239000003345 natural gas Substances 0.000 description 4
- 239000010955 niobium Substances 0.000 description 4
- 238000013001 point bending Methods 0.000 description 4
- 238000009825 accumulation Methods 0.000 description 3
- 239000010953 base metal Substances 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 230000003749 cleanliness Effects 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 230000001965 increasing effect Effects 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 235000002639 sodium chloride Nutrition 0.000 description 2
- 239000011780 sodium chloride Substances 0.000 description 2
- 239000007858 starting material Substances 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- -1 Sulfur forms sulfides Chemical class 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 125000004429 atom Chemical group 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
- C21D9/14—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes wear-resistant or pressure-resistant pipes
-
- 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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- 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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- 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
-
- 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
-
- 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
-
- 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
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
-
- 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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- 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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
-
- 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
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
-
- 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
- C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
-
- 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
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
-
- 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
-
- 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
-
- 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
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
-
- 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
-
- 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
- C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/01—Risers
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/50—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for welded joints
Definitions
- the present invention relates to a low alloy steel.
- a steel pipe called a riser, flowline, or trunkline is used for transmission of crude oil or natural gas between an oil well or gas well located at the bottom of the sea and a platform on the sea or between the platform and a refinery station on the land.
- a riser, flowline, or trunkline is used for transmission of crude oil or natural gas between an oil well or gas well located at the bottom of the sea and a platform on the sea or between the platform and a refinery station on the land.
- a steel pipe for transmitting crude oil or natural gas exploited from oil fields containing such a corrosive gas is sometimes broken by embrittlement attributable to hydrogen formed from a corrosion reaction called hydrogen induced cracking (hereinafter, referred to as “HIC”) and sulfide stress cracking (hereinafter, referred to as “SSC”).
- HIC hydrogen induced cracking
- SSC sulfide stress cracking
- Patent Document 1 JP5-255746A proposes a steel provided with excellent HIC resistance by defining the heat history and heat treatment conditions at the production time without substantially containing Ni, Cu and Ca.
- Patent Document 2 JP6-336639A proposes a steel provided with HIC resistance and SSC resistance by essentially adding Cr, Ni and Cu.
- Patent Document 3 JP2002-60894A proposes a steel in which the HIC resistance and SSC resistance are enhanced by defining the specific ranges of amounts of C, Ti, N, V and 0.
- Patent Document 4 JP2010-24504A
- a high-strength steel in which, by reducing the amounts of C and Mn and by adding 0.5% or more of Mo, the hardening of weld heat affected zone is restrained, and both of HIC resistance and SSC resistance of base metal and HAZ are achieved.
- An objective of the present invention is to provide a low alloy steel in which a HAZ has excellent hydrogen embrittlement resistance in wet hydrogen sulfide environments or the like without requiring much cost.
- HZ Heat Affected Zone
- the reason why the HAZ is highly susceptible to hydrogen embrittlement is as follows.
- hydrogen intrudes into the steel on account of corrosion reaction.
- This hydrogen can move freely in the crystal lattice of the steel.
- This hydrogen is so-called diffusible hydrogen.
- This hydrogen accumulates in a dislocation or a vacancy, which is one kind of defects in the crystal lattice to embrittle the steel.
- the HAZ is an as-quenched structure being heated to a high temperature by the heat history of welding, and cooled rapidly. Therefore, in the HAZ, the dislocations and vacancies in which hydrogen is trapped exist densely as compared with a thermally refined base metal. As a result, it is considered that the HAZ is highly susceptible to hydrogen embrittlement as compared with the base metal.
- the present invention has been made based on the above-described findings, and the gist thereof is low alloy steels described in the following items (1) to (5).
- a low alloy steel containing, by mass percent, C: 0.01 to 0.15%, Si: 3% or less, Mn: 3% or less, B: 0.005 to 0.050%, and Al: 0.08% or less, and the balance being Fe and impurities, wherein in the impurities, N: 0.01% or less, P: 0.05% or less, S: 0.03% or less, and O: 0.03% or less.
- Hv in the formula means the maximum value of Vickers hardness of HAZ
- B means the content of B (mass %)
- a low alloy steel in which a HAZ has excellent resistance to embrittlement attributable to hydrogen such as stress corrosion cracking in wet hydrogen sulfide environments.
- This low alloy steel is best suitable as a starting material of a steel pipe for the transmission of crude oil or natural gas.
- C carbon
- C is an element effective in enhancing the hardenability of steel and increasing the strength thereof. In order to achieve these effects, 0.01% or more of C must be contained. However, if the content of C exceeds 0.15%, the hardness in the quenched state increases too much, and the HAZ is hardened, so that the hydrogen embrittlement susceptibility of HAZ is enhanced. Therefore, the C content is set to 0.01 to 0.15%.
- the lower limit of the C content is preferably 0.02%, further preferably 0.03%.
- the C content is preferably 0.12% or less, further preferably less than 0.10%.
- Si silicon is an element effective for deoxidation, but brings about a decrease in toughness if being contained excessively. Therefore, the Si content is set to 3% or less.
- the Si content is preferably 2% or less.
- the lower limit of the Si content is not particularly defined; however, even if the Si content is decreased, the deoxidizing effect decreases, the cleanliness of steel is deteriorated, and an excessive decrease in the Si content leads to an increase in production cost. Therefore, the Si content is preferably 0.01% or more.
- Mn manganese
- Mn manganese
- the Mn content is set to 3% or less.
- the lower limit of the Mn content is not particularly defined; however, in order to achieve the strength increasing effect of Mn, 0.2% or more of Mn is preferably contained.
- the lower limit thereof is further preferably 0.4%, and the preferable upper limit thereof is 2.8%.
- B (boron) is an element that constitutes the findings, which are the basis of the present invention.
- B occupies the accumulation site of hydrogen, such as the dislocation or vacancy in the HAZ. Therefore, B is an element effective in enhancing the hydrogen embrittlement resistance.
- B segregates at grain boundaries, thereby enhancing the hardenability indirectly, and contributes to the improvement in strength. In order to achieve these effects, 0.005% or more of B must be contained.
- the B content is set to 0.005 to 0.050%.
- the lower limit of the B content is preferably 0.006%, further preferably 0.008%.
- the upper limit thereof is preferably 0.045%, further preferably 0.040%.
- the lower limit of the B content be controlled according to the highest hardness of HAZ. That is to say, in order to attain sufficient hydrogen embrittlement resistance, the B content is preferably in the range satisfying Formula (1) in the relationship with the maximum value of Vickers hardness of HAZ:
- Hv in the formula means the maximum value of Vickers hardness of HAZ
- B means the content of B (mass %).
- the maximum value of Vickers hardness of HAZ is a value that is determined by a Vickers test in which the test force is 98.07N in conformity to JIS Z2244. Al: 0.08% or less
- Al is an element effective for deoxidation, but if being contained excessively, the effect is saturated, and also the toughness is decreased. Therefore, the Al content is set to 0.08% or less.
- the Al content is preferably 0.06% or less.
- the lower limit of the Al content is not particularly defined; however, an excessive decrease in the Al content does not sufficiently achieve the deoxidizing effect, deteriorates the cleanliness of steel, and also increases the production cost. Therefore, 0.001% or more of Al is preferably contained.
- the Al content in the present invention means the content of acid soluble Al (so-called “sol.Al”).
- the low alloy steel in accordance with the present invention contains the above-described elements, and the balance consists of Fe and impurities.
- the “impurities” mean components that are mixed on account of various factors including raw materials such as ore or scrap when a steel material is produced on an industrial scale. Of the impurities, concerning the elements described below, the content thereof must be restricted stringently.
- N nitrogen
- the N content must be restricted to 0.01% or less.
- the N content is preferably 0.008% or less.
- the lower limit of the N content is not particularly defined; however, an excessive decrease in the N content leads to a remarkable increase in production cost. Therefore, the lower limit of the N content is preferably 0.0001%.
- P phosphorus
- HAZ tungsten carbide
- the P content is restricted to 0.05% or less.
- the lower limit of the P content is not particularly defined; however, an excessive decrease in the P content leads to a remarkable increase in production cost. Therefore, the lower limit of the P content is preferably 0.001%.
- S sulfur
- S sulfur
- the lower limit of the S content is not particularly defined; however, an excessive decrease in the S content leads to a remarkable increase in production cost. Therefore, the lower limit of the S content is preferably 0.0001%.
- the 0 content must be set to 0.03% or less.
- the 0 content is preferably 0.025% or less.
- the lower limit of the 0 content need not particularly be defined; however, an excessive decrease in the 0 content leads to a remarkable increase in production cost. Therefore, the 0 content is preferably 0.0005% or more.
- the low alloy steel in accordance with the present invention may contain the elements described below in lieu of a part of Fe.
- One or more elements selected from Cr (chromium), Mo (molybdenum), Ni (nickel) and Cu (copper) may be contained because these elements enhance the hardenability and contribute to the improvement in strength. However, if the contents thereof are excessively high, the HAZ is hardened remarkably, and therefore the hydrogen embrittlement susceptibility may be enhanced. Therefore, if one or more elements of these elements are contained, the contents thereof are set to 1.5% or less in total.
- the lower limit of the contents of these elements is preferably 0.02%, further preferably 0.05%.
- the upper limit thereof is preferably 1.2%.
- One or more elements selected from Ti (titanium), V (vanadium) and Nb (niobium) may be contained because these elements are elements that form fine carbo-nitrides and contribute to the improvement in strength, and also stably supplement diffusible hydrogen, and bring about a considerable effect of reducing the hydrogen embrittlement susceptibility.
- the contents thereof are excessively high, the formation of carbo-nitrides becomes excessive, and therefore the toughness may be decreased. Therefore, if one or more elements of these elements are contained, the contents thereof are set to 0.2% or less in total.
- the lower limit of the contents of these elements is preferably 0.001%, further preferably 0.003%.
- the upper limit thereof is preferably 0.15%.
- At least one of Ca (calcium) and Mg (magnesium) may be contained because these elements improve the hot workability of steel. However, if the contents thereof are excessively high, these elements combine with oxygen to remarkably decrease the cleanliness, so that the hot workability may rather be deteriorated. Therefore, if at least one kind of these elements is contained, the contents thereof are set to 0.05% or less in total.
- the lower limit of the contents of Ca and/or Mg is preferably 0.0005%, further preferably 0.001%.
- the upper limit thereof is preferably 0.03%.
- test material was prepared by machining a 12 mm-thick low alloy steel plate having the chemical composition given in Table 1 into a 12 mm square and a 100 mm length. This test material was subjected to HAZ-simulated thermal cycle in which the test material was heated to a temperature of 1350° C., at which the hardening of HAZ was remarkable, for 3 seconds by high-frequency induction heating, and thereafter was rapidly cooled. By using this test material, the tests described below were conducted.
- test specimen having a thickness of 2 mm, a width of 10 mm, and a length of 75 mm was sampled from the obtained test material, and the SCC resistance was evaluated by a four-point bending test in conformity to EFC16 specified by the European Federation of Corrosion.
- the test specimen was immersed in a 5% common salt+0.5% acetic acid aqueous solution of normal temperature (24° C.), in which 1 atm hydrogen sulfide gas is saturated, for 336 hours, whereby the presence of occurrence of SSC was examined.
- a low alloy steel in which a HAZ has excellent resistance to embrittlement attributable to hydrogen such as stress corrosion cracking in wet hydrogen sulfide environments.
- This low alloy steel is best suitable as a starting material of a steel pipe for the transmission of crude oil or natural gas.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Physics & Mathematics (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Crystallography & Structural Chemistry (AREA)
- Thermal Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Heat Treatment Of Steel (AREA)
- Heat Treatment Of Sheet Steel (AREA)
- Heat Treatment Of Articles (AREA)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2012-004103 | 2012-01-12 | ||
JP2012004103 | 2012-01-12 | ||
PCT/JP2012/082606 WO2013105395A1 (ja) | 2012-01-12 | 2012-12-17 | 低合金鋼 |
Publications (1)
Publication Number | Publication Date |
---|---|
US20140348695A1 true US20140348695A1 (en) | 2014-11-27 |
Family
ID=48781354
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US14/370,999 Abandoned US20140348695A1 (en) | 2012-01-12 | 2012-12-17 | Low alloy steel |
Country Status (11)
Country | Link |
---|---|
US (1) | US20140348695A1 (ja) |
EP (1) | EP2803743B1 (ja) |
JP (1) | JP5418702B2 (ja) |
CN (1) | CN104053803B (ja) |
AU (1) | AU2012365128B2 (ja) |
BR (1) | BR112014017178A8 (ja) |
CA (1) | CA2856247C (ja) |
ES (1) | ES2689229T3 (ja) |
IN (1) | IN2014DN05913A (ja) |
MX (1) | MX2014008504A (ja) |
WO (1) | WO2013105395A1 (ja) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2010094686A (ja) * | 2008-10-14 | 2010-04-30 | Nippon Steel Corp | 溶接金属の靭性に優れた1パス大入熱溶接継手およびその製造方法 |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5255746A (en) | 1975-10-30 | 1977-05-07 | Mitsubishi Heavy Ind Ltd | Build up process of high speed winder driving roll |
JPS55122820A (en) * | 1979-03-13 | 1980-09-20 | Kawasaki Steel Corp | Manufacture of alloyed zinc-plated high tensile steel sheet with superior workability |
JPS6336639A (ja) | 1986-07-31 | 1988-02-17 | Nec Corp | デ−タ交換方式 |
JPH05320759A (ja) * | 1992-05-19 | 1993-12-03 | Nippon Steel Corp | 微細な亜粒界を有する鋳片および微細な金属組織を有する厚鋼板の製造法 |
JP3793253B2 (ja) * | 1995-08-11 | 2006-07-05 | 新日本製鐵株式会社 | 加工性に優れた熱延鋼板の製造方法 |
JP4272284B2 (ja) * | 1998-12-11 | 2009-06-03 | 日新製鋼株式会社 | 疲労耐久性に優れた中空スタビライザー用電縫溶接鋼管 |
JP5229300B2 (ja) * | 2000-03-31 | 2013-07-03 | Jfeスチール株式会社 | 溶接部靱性に優れた高強度厚肉溶接ベンド鋼管用の素管およびその製造方法 |
JP3714136B2 (ja) | 2000-08-18 | 2005-11-09 | Jfeスチール株式会社 | 電子ビーム溶接特性および耐サワー性能に優れた鋼 |
JP4171281B2 (ja) * | 2002-10-17 | 2008-10-22 | 新日本製鐵株式会社 | 加工性に優れた鋼板及びその製造方法 |
JP5042744B2 (ja) * | 2007-08-23 | 2012-10-03 | 新日本製鐵株式会社 | エレクトロスラグ溶接方法 |
JP5547368B2 (ja) * | 2007-09-12 | 2014-07-09 | 関西ペイント株式会社 | 水性塗料組成物 |
JP2010024504A (ja) * | 2008-07-22 | 2010-02-04 | Sumitomo Metal Ind Ltd | ラインパイプ用継目無鋼管およびその製造方法 |
WO2011096510A1 (ja) * | 2010-02-04 | 2011-08-11 | 新日本製鐵株式会社 | 高強度溶接鋼管及びその製造方法 |
-
2012
- 2012-12-17 JP JP2012558092A patent/JP5418702B2/ja active Active
- 2012-12-17 IN IN5913DEN2014 patent/IN2014DN05913A/en unknown
- 2012-12-17 BR BR112014017178A patent/BR112014017178A8/pt not_active Application Discontinuation
- 2012-12-17 US US14/370,999 patent/US20140348695A1/en not_active Abandoned
- 2012-12-17 MX MX2014008504A patent/MX2014008504A/es active IP Right Grant
- 2012-12-17 AU AU2012365128A patent/AU2012365128B2/en active Active
- 2012-12-17 EP EP12865286.4A patent/EP2803743B1/en active Active
- 2012-12-17 ES ES12865286.4T patent/ES2689229T3/es active Active
- 2012-12-17 CA CA2856247A patent/CA2856247C/en active Active
- 2012-12-17 WO PCT/JP2012/082606 patent/WO2013105395A1/ja active Application Filing
- 2012-12-17 CN CN201280066918.5A patent/CN104053803B/zh active Active
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2010094686A (ja) * | 2008-10-14 | 2010-04-30 | Nippon Steel Corp | 溶接金属の靭性に優れた1パス大入熱溶接継手およびその製造方法 |
Also Published As
Publication number | Publication date |
---|---|
CN104053803B (zh) | 2016-08-24 |
CA2856247A1 (en) | 2013-07-18 |
ES2689229T3 (es) | 2018-11-12 |
BR112014017178A2 (pt) | 2017-06-13 |
EP2803743A4 (en) | 2016-03-09 |
AU2012365128B2 (en) | 2015-09-03 |
JP5418702B2 (ja) | 2014-02-19 |
EP2803743B1 (en) | 2018-08-22 |
IN2014DN05913A (ja) | 2015-06-05 |
MX2014008504A (es) | 2014-10-14 |
CN104053803A (zh) | 2014-09-17 |
BR112014017178A8 (pt) | 2017-07-04 |
CA2856247C (en) | 2017-08-01 |
WO2013105395A1 (ja) | 2013-07-18 |
EP2803743A1 (en) | 2014-11-19 |
JPWO2013105395A1 (ja) | 2015-05-11 |
AU2012365128A1 (en) | 2014-06-26 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US8007603B2 (en) | High-strength steel for seamless, weldable steel pipes | |
JP4538094B2 (ja) | 高強度厚鋼板およびその製造方法 | |
US10233523B2 (en) | Carburization resistant metal material | |
KR101345074B1 (ko) | Ni기 합금재 | |
US20160168672A1 (en) | High-strength steel material for oil well and oil well pipes | |
WO2005017222A1 (ja) | 耐食性に優れた油井用高強度ステンレス鋼管およびその製造方法 | |
US20130294959A1 (en) | Heat-resistant steel | |
WO2005042793A1 (ja) | 耐食性に優れたラインパイプ用高強度ステンレス鋼管およびその製造方法 | |
EP2803741B1 (en) | Method of post weld heat treatment of a low alloy steel pipe | |
KR20130133030A (ko) | 2상 스테인리스강 | |
JP2013144842A (ja) | 耐再熱割れ性と強度、靭性に優れたCr−Mo鋼板およびその製造方法 | |
US8747575B2 (en) | 655 MPa grade martensitic stainless steel having high toughness and method for manufacturing the same | |
US9677160B2 (en) | Low C-high Cr 862 MPa-class steel tube having excellent corrosion resistance and a manufacturing method thereof | |
CA2856247C (en) | Low alloy steel | |
US9284634B2 (en) | Martensitic stainless steel having excellent corrosion resistance | |
RU2782832C1 (ru) | Высокопрочная маломагнитная нестабилизированная свариваемая сталь, устойчивая к локальным видам коррозии в зонах термического влияния сварки и длительного нагрева в области опасных температур | |
RU2629126C1 (ru) | Труба бесшовная нефтяного сортамента высокопрочная в сероводородостойком исполнении | |
KR20210028382A (ko) | 충격인성 및 열간가공성이 우수한 고내식 오스테나이트계 스테인리스강 | |
JPS61235544A (ja) | 耐サワ−性が良好な溶接構造用高強度オ−ステナイト系ステンレス鋼 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |