FIELD: metallurgy, in particular, production of rolled parts of specifically complex shape from low-carbon steel.
SUBSTANCE: method involves melting steel in electric furnace; providing processing beyond furnace; pouring into casting molds while providing protection of flow; hot rolling of ingots and obtaining blank; providing controlled rolling of blank; winding rolled product into rolls; gauging rolled products at deformation extent of 15-20% and providing spheroidizing annealing process; melting steel at following ratio of components, wt%: carbon 0.27-0.32; manganese 0.30-0.65; silicon 0.01-0.25; sulfur 0.005-0.020; niobium 0.005-0.02; calcium 0.001-0.010; iron the balance, with following ratios being provided:12/C - Mn/0.03 equal to or exceeding 20; Ca/S equal to or exceeding 0.065. Process of microalloying of steel with niobium inhibits steel recrystallization process at rolling finishing temperature of 950-1,0000C to allow controlled rolling on existing equipment and formation of fine-grained structure. Spheroidizing annealing process is performed by high-speed heating of cold deformed metal at intercritical temperature range, followed by regulated cooling within temperature range of 650-7300C at cooling rate of 1.0-1.50C/min and further cooling in thermal chamber at temperature of cooling medium of 100-1500C. Method allows spheroidizing process time to be reduced by 5-10 times.
EFFECT: increased efficiency and provision for producing of rolled bars having structure providing adequate conditions for cold bulk pressing of compound profiled high-strength fastening parts from steel with improved ductility and toughness.
2 cl, 1 ex
Title | Year | Author | Number |
---|---|---|---|
METHOD FOR PRODUCING OF SPHEROIDIZED ROLLED BARS FROM BORON STEEL FOR COLD BULK PRESSING OF HIGH-STRENGTH FASTENING PARTS | 2003 |
|
RU2238335C1 |
METHOD FOR PRODUCING OF ROLLED BARS FROM LOW CARBON STEEL FOR COLD BULK PRESSING OF COMPOUND-SHAPED FASTENING PARTS | 2003 |
|
RU2238337C1 |
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 |
METHOD FOR PRODUCING OF ROLLED BARS FROM BORON STEEL FOR COLD BULK PRESSING OF HIGH-STRENGTH FASTENING PARTS | 2003 |
|
RU2238333C1 |
ROUND-PROFILED ROLLED IRON FROM LOW-ALLOYED STEEL FOR COLD DIE FORGING OF HIGH-STRENGTH GEOMETRICALLY COMPLEX FASTENING MEMBERS | 2003 |
|
RU2249624C1 |
ROUND MERCHANT SHAPES MADE FROM LOW-CARBON HIGH-DUCTILITY STEEL FOR COLD DIE FORGING OF INTRICATE-SHAPE FASTENING PARTS | 2003 |
|
RU2262538C1 |
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 FROM CONTINUOUSLY CAST ROLLED BAR OF LOW-CARBON STEEL FOR COLD BULK PRESSING OF COMPOUND-SHAPED FASTENING PARTS | 2003 |
|
RU2238336C1 |
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 MICROALLOYED HIGH-PLASTICITY STEEL FOR COLD DIE FORGING OF HIGH-STRENGTH FASTENING MEMBERS | 2003 |
|
RU2249627C1 |
Authors
Dates
2004-10-20—Published
2003-08-05—Filed