FIELD: metallurgy.
SUBSTANCE: workpiece is made from steel with the specified chemical composition and heated to 1190-1220°C during 5-6 hours; preliminary deformation with regulated swaging of not less than 12% is performed at temperature of 1020-1120°C; final deformation is performed at temperature of 800-840°C; at that, each next swaging is larger than the previous one by 1-2%; then, hot straightening of strip and cooling is performed in quick cooling plant to temperature of 500-560°C at the rate of 16-20% with further slow cooling to temperature of not more than 150°C and then, in the air.
EFFECT: providing yield strength of not less than 570 for steel with strength class K65 and 590 for steel with strength class K70, ultimate resistance of not less than 650 for steel with strength class K65, and 690 for steel with strength class K70 and high crack resistance at maintaining high manufacturability.
3 tbl, 1 ex
| Title | Year | Author | Number |
|---|---|---|---|
| METHOD OF PRODUCTION OF ROLLED PLATES WITH STRENGTH CLASS K65, X80, L555 TO MANUFACTURE ARC WELDED PIPES OF MAIN PIPELINES | 2013 |
|
RU2549023C1 |
| METHOD FOR MANUFACTURE OF PLATE-ROLLED PRODUCT WITH HIGH DEFORMATION CAPACITY, PLATE-ROLLED PRODUCT | 2017 |
|
RU2654121C1 |
| METHOD OF PRODUCING HOT-ROLLED SHEETS OF LOW-ALLOYED STEEL OF K65 STRENGTH GRADE FOR LONGITUDINAL ELECTRIC-WELDED PIPES | 2015 |
|
RU2615667C1 |
| PROCEDURE FOR PRODUCTION OF PLATE IRON LOW-ALLOYED STRIP | 2009 |
|
RU2393238C1 |
| METHOD FOR PRODUCTION OF HOT-ROLLED SHEETS FROM LOW-ALLOY STEEL OF STRENGTH CLASS K65 FOR ELECTRIC-WELDED LONGITUDINAL PIPES WITH HIGH STRAIN CAPACITY | 2022 |
|
RU2790840C1 |
| METHOD OF PRODUCING SHEETS FROM LOW-ALLOY TUBE STEEL OF K65 STRENGTH CLASS | 2012 |
|
RU2492250C1 |
| METHOD OF PRODUCING SHEET ROLLED PRODUCTS FROM LOW-ALLOY PIPE STEEL | 2017 |
|
RU2696186C2 |
| METHOD OF PRODUCTION OF ROLLED PLATES WITH STRENGTH CLASS K80, X100, L690 TO MANUFACTURE ARC WELDED PIPES OF MAIN PIPELINES | 2017 |
|
RU2635122C1 |
| METHOD OF HOT ROLLED SHEETS MANUFACTURING FROM K60 DURABILITY CLASS LOW-ALLOYED STEEL WITH THE THICKNESS OF UP TO 40 mm | 2018 |
|
RU2675891C1 |
| PIPE WITH HIGH STRAIN CAPACITY OF STRENGTH CLASS K65 AND METHOD FOR ITS PRODUCTION | 2022 |
|
RU2790721C1 |
