Austenitic stainless steel and method
Abstract
Abstract A CHROMIUM-NICKEL-MOLYBDENUM AUSTENITIC STAINLESS STEEL, PRIMARILY FOR SUPERIOR CORROSION RESISTANCE FOR SPECIAL APPLICATION SUCH AS IN THE CHEMICAL AND PROCESS INDUSTRIES, HAS BEEN OBTAINED BY INITIAL FORGING (ROLLING) OF THE SAME ONLY BETWEEN CRITICAL TEMPERATURES OF 2050* TO 2200*F., WHEN SAID NOVEL STAINLESS STEEL HAS ESSENTIALLY THE FOLLOWING COMPOSITIONS ON WEIGHT BASIS: PERCENT CHROMIUM 20.00 TO 23.00 NICKEL 23.00 TO 26.00 MOLYBEDNUM 4.00 TO 5.00 SILICON (MAXIMUM) 1.00 MANGANESE (MAXIMUM) 2.00 COLUMBIUM 0.20 TO 0.40 CARBON (MAXIMUM) 0.04 IRON BALANCE AN ANNEALING STEP IS NOT REQUIRED TO AVOID INTERGRANULAR CORROSION IN WELDING THE NOVEL ALLOY. THE NOVEL ALLOY CAN BE EMPLOYED IN CHEMICAL APPARATUS USED, FOR EXAMPLE IN WET PHOSPHORIC ACID PROCESSES.
Inventors
- 👤 Roland E Groethe
Bibliographic Details
Claims Analysis
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-05 | 1974-10-05 | 1975-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-05 | 1978-10-05 | 1979-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-05 | 1982-10-05 | 1983-04-06 | $7700.00 | Window Closed / Lapsed |