FIELD: metallurgy.
SUBSTANCE: method involves melting steel in electric furnace; processing beyond furnace; pouring in casting molds while protecting metal flow; hot rolling of ingot for producing of blank, with following rolling thereof and controlled cooling and winding of rolled product into rolls; melting steel containing, wt%: carbon 0.17-0.25; manganese 0.30-0.65; silicon 0.01-0.17; sulfur 0.005-0.020; vanadium 0.005-0.07; niobium 0.005-0.02; calcium 0.001-0.010, with following ratio being met: 12/C-Mn/0.02≥27; 0.46≥6xV+8xNb≥0.22; Ca/S≥0.065. Steel microalloying with niobium inhibits steel recrystallization processes at rolling final temperature of 1,000-1,0500C. Hot rolling of bars is completed at temperature of 1,000-1,0500C, with following accelerated cooling to temperature of 750-8500C and rolling at deformation extent of at least 30% with following cooling in air to temperature of 3000C.
EFFECT: provision for producing of rolled bars with structure allowing adequate cold bulk pressing conditions to be created without additional spheroidizing annealing process and improved steel deformability characteristics.
2 cl, 2 ex
| Title | Year | Author | Number |
|---|---|---|---|
| ROUND-PROFILED ROLLED IRON FROM LOW-CARBON STEEL FOR COLD DIE FORGING OF HIGH-STRENGTH ESPECIALLY HIGH-PROFILED FASTENING MEMBERS | 2003 |
|
RU2249628C1 |
| METHOD FOR PRODUCING OF ROLLED BARS FROM BORON STEEL FOR COLD BULK PRESSING OF HIGH-STRENGTH FASTENING PARTS | 2003 |
|
RU2238333C1 |
| ROUND MERCHANT SHAPES MADE FROM LOW-CARBON HIGH-DUCTILITY STEEL FOR COLD DIE FORGING OF INTRICATE-SHAPE FASTENING PARTS | 2003 |
|
RU2262538C1 |
| ROUND MERCHANT SHAPES MADE FROM ALLOYED STEEL FOR COLD DIE FORGING OF INTRICATE-SHAPE PROFILES FOR HIGH-STRENGTH FASTENING PARTS | 2003 |
|
RU2262539C1 |
| ROUND-PROFILED ROLLED IRON FROM LOW-ALLOYED STEEL FOR COLD DIE FORGING OF HIGH-STRENGTH FASTENING MEMBERS | 2003 |
|
RU2249625C1 |
| ROUND-PROFILED ROLLED IRON FROM MEDIUM-CARBON HIGH-PLASTICITY STEEL FOR COLD DIE FORGING OF HIGH-STRENGTH ESPECIALLY HIGH-PROFILED FASTENING MEMBERS | 2003 |
|
RU2249629C1 |
| ROUND-PROFILED ROLLED IRON FROM MEDIUM-CARBON BORON-CONTAINING STEEL FOR COLD DIE FORGING OF HIGH-STRENGTH FASTENING MEMBERS | 2003 |
|
RU2249626C1 |
| METHOD FOR PRODUCING OF SPHEROIDAL ROLLED BAR FROM LOW-CARBON STEEL FOR COLD BULK PRESSING OF COMPOUND-PROFILED FASTENING PARTS | 2003 |
|
RU2238339C1 |
| METHOD FOR PRODUCING FROM CONTINUOUSLY CAST ROLLED BAR WITH SPHEROIDAL STRUCTURE OF LOW-CARBON STEEL FOR COLD BULK PRESSING OF HIGH-STRENGTH FASTENING PARTS OF COMPOUND SHAPE | 2003 |
|
RU2238338C1 |
| ROUND-PROFILED ROLLED IRON FROM LOW-ALLOYED STEEL FOR COLD DIE FORGING OF HIGH-STRENGTH GEOMETRICALLY COMPLEX FASTENING MEMBERS | 2003 |
|
RU2249624C1 |
