FIELD: metallurgy.
SUBSTANCE: invention proposes low-alloy steel with enhanced strength comprising the following ratio of components, wt.-%: carbon, 0.17-0.24; manganese, 0.35-0.65; silicon, 0.17-0.37; niobium, 0.05-0.08; chrome, 0.20-0.50; nickel, 0.20-0.50, and iron, the balance in the following ratio: {[manganese] + 0.3 x [chrome] + 0.5 x [nickel] + 0.7 [copper]}/[niobium] = 10-20. Invention provides improving impact viscosity indices in combination with enhancing strengthening properties of metal-rolling productions in hot and thermally treated state, enhancing structural strength and exploitation indices of electric arc welded straight-seamed oil and gas pipelines. The proposed composition of steel can be used in making electric arc welded straight-seamed pipelines of large diameter with the prolonged exploitation work life.
EFFECT: improved and valuable properties of steel.
2 tbl, 1 ex
| Title | Year | Author | Number |
|---|---|---|---|
| METHOD OF PRODUCTION OF ROLLED SHEETS | 2005 |
|
RU2270872C1 |
| PROCEDURE FOR MANUFACTURE OF FLAT | 2010 |
|
RU2430978C1 |
| METHOD FOR PRODUCTION OF PLATE STEEL FROM LOW ALLOYED STEEL FOR PIPES | 2018 |
|
RU2702171C1 |
| STEEL OF IMPROVED CORROSION RESISTANCE AND ELECTRIC WELDED PIPES MADE FROM IT | 2009 |
|
RU2433198C2 |
| STEEL OF HIGHER RUSTPROOF QUALITIES AND ELECTRIC-WELDED PIPES MADE THEREOF | 2013 |
|
RU2520170C1 |
| METHOD OF PRODUCING SHEET ROLLED PRODUCTS FROM LOW-ALLOY PIPE STEEL | 2017 |
|
RU2696186C2 |
| METHOD OF PRODUCING SHEETS FROM LOW-ALLOY TUBE STEEL OF K65 STRENGTH CLASS | 2012 |
|
RU2492250C1 |
| METHOD OF PRODUCING ROLLED METAL FOR MAKING PIPES OF STRENGTH CATEGORY K48-K56, RESISTANT TO HYDROGEN SULPHIDE CRACKING AND GENERAL CORROSION, AND PIPE MADE FROM IT | 2018 |
|
RU2709077C1 |
| METHOD OF MANUFACTURING CORROSION ROLLED PRODUCT FROM LOW-ALLOY STEEL | 2018 |
|
RU2681074C1 |
| METHOD OF PRODUCTION OF LOW ALLOYED COLD-RESISTANT WELDED ROLLED PLATES WITH INCREASED CORROSION RESISTANT | 2014 |
|
RU2569619C1 |
