Low alloy steel, seamless steel oil country tubular goods, and method for producing seamless steel pipe
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[0011]The above-described documents all described sour resistance of low alloy steel used in hydrogen sulfide environments of about 1 atm. However, the study by the present inventors found that the sour resistance mechanism in low alloy steel in a hydrogen sulfide environment at low pressures of about 1 atm is different from that in hydrogen sulfide environments at higher pressures.
[0012]The present inventors tested sulfide stress corrosion cracking resistance in various kinds of low alloy steel by four-point bending and obtained the following findings. The low alloy steel used in this test contains by mass %, Mn of 0.5 to 1.3%, Cr of 0.2 to 1.1% and Mo of 0 to 0.7%.
[0013](1) Corrosion rate increases at 2 atm or more, and becomes especially high at 5 to 10 atm hydrogen sulfide, but decreases at 15 atm hydrogen sulfide.
[0014](2) Sulfide stress corrosion cracking has been assumed to occur in hydrogen sulfide at a partial pressure around 1 atm in t...
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