Claims
- 1. A low-alloy steel product in the form of a block, bar, plate, or forged shape made from a steel comprising, in weight percent:
- ______________________________________Carbon 0.3 to 0.55Manganese 0.3 to 1.5Silicon from traces up to 1.0Chromium 0.75 to 1.8Nickel from traces up to 2.0Molybdenum 0.05 to 0.4Vanadium 0.05 to 0.15Phosphorus 0.03 maxSulphur from traces up to 0.05Aluminum 0.04 to 0.1 orTitanium 0.015 to 0.08, orAluminum and Titanium,______________________________________
- wherein the total amount of Al+2.times.Ti is about 0.04 to about 0.16, balance iron, the bulk of the steel having been melted in a furnace said aluminum and/or titanium having been added to the steel melt by microalloying after melting the bulk of the steel, the microalloyed steel having been subjected to superheating to at least 1625.degree. C. for at least two minutes prior to teeming, casting to ingots, and hot working the ingots to form said block, bar, plate or forged shape, said steel having a Jominy hardenability corresponding to a hardness of more than 50 HRC at a distance of 50 mm from the quenched end after austenitization at 875.degree. C. for 30 minutes.
- 2. A low-alloy steel product according to claim 1, wherein the steel comprises, in weight percent:
- ______________________________________Carbon 0.4 to 0.55Manganese 0.5 to 1.2Silicon from traces up to 1.0Chromium 1.1 to 1.8Nickel 0.2 to 1.2Molybdenum 0.15 to 0.4Vanadium 0.05 to 0.15Phosphorus 0.025 maxSulphur 0.005 to 0.05Aluminum 0.04 to 0.08 orTitanium 0.015 to 0.06 orAluminum and Titanium, wherein______________________________________
- the total amount of Al+2.times.Ti is about 0.04 to about 0.13, balance iron.
- 3. A low-alloy steel product according to claim 2, wherein the steel comprises, in weight percent:
- ______________________________________Carbon 0.42 to 0.49Manganese 0.6 to 1.0Silicon up to 0.4Chromium 1.4 to 1.7Nickel 0.2 to 0.8Molybdenum 0.15 to 0.30Vanadium 0.07 to 0.13Phosphorus 0.025 maxSulphur 0.025 to 0.045Aluminum 0.04 to 0.07 orTitanium 0.015 to 0.06 orAluminum and Titanium, wherein______________________________________
- the total amount of Al+2.times.Ti is about 0.04 to about 0.12, balance iron.
- 4. A low-alloy steel product according to claim 1, 2 or 3, wherein the steel product has been austenitized at a temperature of between 800.degree. and 900.degree. C., quenched in oil, and tempered at between 500.degree. and 700.degree. C.
- 5. A low-alloy steel product according to claim 4, wherein the product consists of a die block or other forged shape.
Parent Case Info
This is a divisional application of Ser. No. 867,566, filed May 28, 1986, now U.S. Pat. No. 4,673,433.
US Referenced Citations (3)
Foreign Referenced Citations (6)
Number |
Date |
Country |
0112220 |
Sep 1978 |
JPX |
0037156 |
Mar 1983 |
JPX |
0230965 |
Nov 1985 |
JPX |
0298685 |
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Divisions (1)
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Number |
Date |
Country |
Parent |
867566 |
May 1986 |
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