US4153454A
Expired / Lapsed
US
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Steel materials having an excellent hydrogen induced cracking resistance
Assignee: JFE Steel Corp
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Filing: 1977-12-23
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Granted: 1979-05-08
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Expires: 1997-12-23
Abstract
Abstract Steel materials having an excellent hydrogen induced cracking resistance when used under atmosphere containing H 2 S, which contain 0.05 to 0.20% of C, 0.01 to 0.50% of Si, 0.60 to 2.00% of Mn, 0.01 to 0.10% of Al, less than 0.0020% of S, Ca of 0.0020% to less than 0.0050%. These steel materials are increased in the tensile strength by additionally containing at least one of Cu, Ni, Cr, B, Mo, Nb, V, Zr and Ti. Furthermore the effect of addition of Ca is stabilized by adding rare-earth elements.
Inventors
- 👤 Toshihiko Emi
- 👤 Osamu Haida
- 👤 Shinobu Okano
- 👤 Shuji Watanabe
- 👤 Akitoshi Fujiwara
- 👤 Toshiaki Shiraishi
- 👤 Hiroshi Ooi
- 👤 Toshio Iwasaki
- 👤 Noboru Okamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:16
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/60
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
74 words
In a steel having excellent hydrogen induced cracking resistance, which consists essentially of 0.05 to 0.20% of C, 0.01 to 0.50% of Si, 0.60 to 2.00% of Mn and 0.01 to 0.10% of Al and which is used under atmosphere containing hydrogen sulfide, the improvement wherein said steel contains S in an amount less than 0.0020% and Ca in an amount of 0.0020% to less than 0.0050%, the remainder being Fe inclusive inevitable impurities.
Claim 2
Dependent Claim
74 words
In a steel having excellent hydrogen induced cracking resistance, which consists essentially of 0.05 to 0.20% of C, 0.01 to 0.50% of Si, 0.60 to 2.00% of Mn and 0.01 to 0.10% of Al and which is used under atmosphere containing hydrogen sulfide, the improvement wherein said steel contains S in an amount less than 0.0020% and Ca in an amount of 0.0020% to less than 0.0050%, the remainder being Fe inclusive inevitable impurities.
Claim 3
Dependent Claim
132 words
In a steel having excellent hydrogen induced cracking resistance and a high tensile strength, which consists essentially of 0.05 to 0.20% of C, 0.01 to 0.50% of Si, 0.60 to 2.00% of Mn and 0.01 to 0.10% of Al and which is used under atmosphere containing hydrogen sulfide, the improvement wherein said steel contains S in an amount less than 0.0020% and Ca in an amount of 0.0020% to less than 0.0050%, and further containing at least one of 0.20 to 0.60% of Cu, 0.10 to 0.60% of Ni, less than 0.80% of Cr, 0.0005 to 0.0050% of B, 0.10 to 0.80% of Mo, 0.01 to 0.15% of Nb, 0.01 to 0.15% of V, 0.01 to 0.10% of Zr, and 0.01 to 0.10% of Ti, the remainder being Fe inclusive inevitable impurities.
Claim 4
Dependent Claim
132 words
In a steel having excellent hydrogen induced cracking resistance and a high tensile strength, which consists essentially of 0.05 to 0.20% of C, 0.01 to 0.50% of Si, 0.60 to 2.00% of Mn and 0.01 to 0.10% of Al and which is used under atmosphere containing hydrogen sulfide, the improvement wherein said steel contains S in an amount less than 0.0020% and Ca in an amount of 0.0020% to less than 0.0050%, and further containing at least one of 0.20 to 0.60% of Cu, 0.10 to 0.60% of Ni, less than 0.80% of Cr, 0.0005 to 0.0050% of B, 0.10 to 0.80% of Mo, 0.01 to 0.15% of Nb, 0.01 to 0.15% of V, 0.01 to 0.10% of Zr, and 0.01 to 0.10% of Ti, the remainder being Fe inclusive inevitable impurities.
Claim 5
Dependent Claim
26 words
The steel as claimed in claim 1, wherein said steel additionally contain at least one of rare-earth elements in the total amount of 0.008 to 0.030%.
Claim 6
Dependent Claim
26 words
The steel as claimed in claim 2, wherein said steel additionally contain at least one of rare-earth elements in the total amount of 0.008 to 0.030%.
Claim 7
Dependent Claim
18 words
The steel as claimed in claim 1, wherein the content of Ca is 0.0040% to less than 0.0050%.
Claim 8
Dependent Claim
18 words
The steel as claimed in claim 2, wherein the content of Ca is 0.0040% to less than 0.0050%.
Claim 9
Dependent Claim
18 words
The steel as claimed in claim 3, wherein the content of Ca is 0.0025% to less than 0.0050%.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-05-07 | 1982-11-06 | 1983-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-05-07 | 1986-11-06 | 1987-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-05-07 | 1990-11-06 | 1991-05-08 | $7700.00 | Window Closed / Lapsed |