IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0982517
(2004-11-05)
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등록번호 |
US-7481897
(2009-01-27)
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발명자
/ 주소 |
|
출원인 / 주소 |
- TRW Automotive U.S. LLC
- Sumitomo Metal Industries Ltd.
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대리인 / 주소 |
Tarolli, Sundheim, Covell & Tummino LLP
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인용정보 |
피인용 횟수 :
1 인용 특허 :
8 |
초록
An apparatus includes a low-carbon steel member. The low-carbon steel member yields plastically more than about 5% before fracturing at temperatures down to about-40° C. when stress is applied to the low-carbon steel member sufficient to cause the low-carbon steel member to so yield.
대표청구항
▼
Having described the invention, the following is claimed: 1. An apparatus comprising a cold worked induction heated low-carbon steel member, the low-carbon steel member yielding plastically more than about 5% before fracturing at temperatures down to about-100° C. when stress sufficient to cause th
Having described the invention, the following is claimed: 1. An apparatus comprising a cold worked induction heated low-carbon steel member, the low-carbon steel member yielding plastically more than about 5% before fracturing at temperatures down to about-100° C. when stress sufficient to cause the low-carbon steel member to so yield is applied to the low-carbon steel member. 2. The apparatus of claim 1, the low-carbon steel member comprising an SAE-AISI 1010 grade carbon steel wherein the composition is controlled so that the weight percent of carbon does not exceed about 0.12%, the weight percent of sulfur does not exceed about 0.015%, the weight percent of phosphorous does not exceed about 0.020%, the weight percent of chromium does not exceed 1.30%, the weight percent of molybdenum does not exceed about 0.60%, and the combined weight percent of phosphorous and sulfur does not exceed about 0.025%. 3. The apparatus of claim 1, the low-carbon steel member consisting essentially of, by weight, about 0.07% to about 0.20% carbon, up to about 1.60% manganese, up to about 0.030% phosphorous, up to about 0.025% sulfur, about 0.06% to about 0.35% silicon, up to about 1.20% chromium, up to about 0.65% nickel, up to about 0.70% molybdenum, up to about 0.35% copper, about 0.02% to about 0.06% aluminum, up to about 0.10% vanadium, up to about 0.25% residual elements, and the balance iron. 4. The apparatus of claim 3, the low-carbon steel member having a tensile strength of at least about 130,000 psi, a yield strength of at least about 104,000 psi, and an elongation at break of at least about 14%. 5. An apparatus comprising a cold worked induction heated low-carbon steel member, the low-carbon steel member having a tensile strength of at least about 130,000 psi, a yield strength of at least about 104,000 psi, an elongation at break of at least about 14%, and yielding plastically more than about 5% before fracturing at temperatures down to about-100° C. when stress sufficient to cause the low-carbon steel member to so yield is applied to the low-carbon steel member. 6. The apparatus of claim 5, the low-carbon steel member comprising an SAE-AISI 1010 grade carbon steel wherein the composition is controlled so that the weight percent of carbon does not exceed about 0.12%, the weight percent of sulfur does not exceed about 0.015%, the weight percent of phosphorous does not exceed about 0.020%, the weight percent of chromium does not exceed about 1.30%, the weight percent of molybdenum does not exceed about 0.60%, and the combined weight percent of phosphorous and sulfur does not exceed about 0.025%. 7. The apparatus of claim 5, the low-carbon steel member consisting essentially of, by weight, about 0.07% to about 0.20% carbon, up to about 1.60% manganese, up to about 0.030% phosphorous, up to about 0.025% sulfur, about 0.06% to about 0.35% silicon, up to about 1.20% chromium, up to about 0.65% nickel, up to about 0.70% molybdenum, up to about 0.35% copper, about 0.02% to about 0.06% aluminum, up to about 0.10% vanadium, up to about 0.25% residual elements, and the balance iron. 8. A method comprising the steps of: casting a billet of low-carbon steel; forming a low-carbon steel member from the cast billet of low-carbon steel, cold working the low-carbon steel member after forming the low-carbon steel member but prior to finishing the low-carbon steel member; and induction heating the low-carbon steel member to a temperature of at least about 900° C. after cold working the low-carbon steel member but prior to finishing the low-carbon steel member so that the low-carbon steel member yields plastically more than about 5% before fracturing at temperatures down to about-100° C. when stress sufficient to cause the low-carbon steel member to so yield is applied to the low-carbon steel member. 9. The method of claim 8, the low-carbon steel comprising an SAE-AISI 1010 grade carbon steel wherein the composition is controlled so that the weight percent of carbon does not exceed about 0.12%, the weight percent of sulfur does not exceed 0.015%, the weight percent of phosphorous does not exceed about 0.020%, the weight percent of chromium does not exceed about 1.30%, the weight percent of molybdenum does not exceed about 0.60%, and the combined weight percent of phosphorous and sulfur does not exceed about 0.025%. 10. The method of claim 8, the low-carbon steel consisting essentially of, by weight, about 0.07% to about 0.20% carbon, up to about 1.60% manganese, up to about 0.030% phosphorous, up to about 0.025% sulfur, about 0.06% to about 0.35% silicon, up to about 0.1.20% chromium, up to about 0.65% nickel, up to about 0.70% molybdenum, up to about 0.35% copper, about 0.02% to about 0.06% aluminum, up to about 0.10% vanadium, up to about 0.25% residual elements, and the balance iron. 11. The method of claim 10, the low-carbon steel member having a tensile strength of at least about 130,000 psi, a yield strength of at least about 104,000 psi, and an elongation at break of at least about 14%. 12. An apparatus comprising a cold worked induction heated low-carbon steel tube, the low-carbon steel tube yielding plastically more than about 5% before fracturing at temperatures down to about-100° C. when stress sufficient to cause the low-carbon steel tube to so yield is applied to the low-carbon steel tube. 13. The apparatus of claim 12, the low-carbon steel tube comprising an SAE-AISI 1010 grade carbon steel wherein the composition is controlled so that the weight percent of carbon does not exceed about 0.12%, the weight percent of sulfur does not exceed about 0.015%, the weight percent of phosphorous does not exceed about 0.020%, the weight percent of chromium does not exceed about 1.30%, the weight percent of molybdenum does not exceed about 0.60%, and the combined weight percent of phosphorous and sulfur does not exceed about 0.025%. 14. The apparatus of claim 12, the low-carbon steel tube consisting essentially of, by weight, about 0.07% to about 0.20% carbon, up to about 1.60% manganese, up to about 0.030% phosphorous, up to about 0.025% sulfur, about 0.06% to about 0.35% silicon, up to about 1.20% chromium, up to about 0.65% nickel, up to about 0.70% molybdenum, up to about 0.35% copper, about 0.02% to about 0.06% aluminum, up to about 0.10% vanadium, up to about 0.25% residual elements, and the balance iron. 15. The apparatus of claim 14, the low-carbon steel tube having a tensile strength of at least about 130,000 psi, a yield strength of at least about 104,000 psi, and an elongation at break of at least about 14%. 16. A method comprising the steps of: casting a billet of low-carbon steel, the billet of low-carbon steel having a first diameter; reducing the diameter of the billet of low-carbon steel by hot-rolling the billet; forming a tube having an annular wall by piercing the billet; reducing the thickness of the annular wall to a first thickness by cold drawing the tube; induction heating the tube to a temperature of at least about 900° to form a low-carbon steel tube that yields plastically more than about 5% before fracturing at temperatures down to about-100° C. when stress sufficient to cause the low-carbon steel tube to so yield is applied to the low-carbon steel tube. 17. The method of claim 16, the low-carbon steel comprising an SAE-AISI 1010 grade carbon steel wherein the composition is controlled so that the weight percent of carbon does not exceed about 0.12%, the weight percent of sulfur does not exceed about 0.015%, the weight percent of phosphorous does not exceed about 0.020%, the weight percent of chromium does not exceed about 1.30%, the weight percent of molybdenum does not exceed about 0.60%, and the combined weight percent of phosphorous and sulfur does not exceed about 0.025%. 18. The method of claim 16, the low-carbon steel consisting essentially of, by weight, about 0.07% to about 0.20% carbon, up to about 1.60% manganese, up to about 0.030% phosphorous, up to about 0.025% sulfur, about 0.06% to about 0.35% silicon, up to about 1.20% chromium, up to about 0.65% nickel, up to about 0.70% molybdenum, up to about 0.35% copper, about 0.02% to about 0.06% aluminum, up to about 0.10% vanadium, up to about 0.25% residual elements, and the balance iron. 19. The method of claim 18, the low-carbon steel tube having a tensile strength of at least about 130,000 psi, a yield strength of at least about 104,000 psi, and an elongation at break of at least about 14%.
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