Steel for manufacturing large forged parts
US4689095A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 5, 1985 |
| Grant date | Aug 25, 1987 |
| Priority date | — |
| Expiry date | Jun 5, 2005 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22C38/54
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The present invention provides a steel containing, by mass: PA1 from 0.16% to 0.22% carbon (C) PA1 less than 0.3% silicon (Si) PA1 less than 0.5% manganese (Mn) PA1 from 0.6% to 0.9% nickel (Ni) PA1 from 10.7% to 12.3% chromium (Cr) PA1 from 0.8% to 1.1% molybdenum (Mo) PA1 from 0.2% to 0.35% vanadium (V) PA1 from 0.07% to 0.20% niobium (Nb) PA1 from 0.05% to 0.11% nitrogen (N.sub.2) PA1 less than 0.008% boron (B) and not more than the following residual percentages by mass: 0.020% sulfur, 0.020% phosphorous, 0.025% cobalt, 0.010% aluminum, 0.02% titanium, 0.02% tin, 0.10% copper, 0.015% tungsten, 0.020% arsenic, and 0.0025% antimony; the remainder of the alloy being iron; said steel having a nickel equivalent calculated using the formula: EQU Ni eq=30C+0.5Mn+2Ni+25N.sub.2 +40B, lying in the range 9 to 10.2; and a chromium equivalent calculated using the formula: EQU Cr eq=Cr+2Si+1.5Mo+5V+1.75Nb lying in the range 14.5 to 15.5; the ratio between the chromium equivalent and the nickel equivalent lying in the range 1.49 to 1.65.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.