ROUND-PROFILED ROLLED IRON FROM LOW-CARBON STEEL FOR COLD DIE FORGING OF HIGH-STRENGTH ESPECIALLY HIGH-PROFILED FASTENING MEMBERS Russian patent published in 2005 - IPC

Abstract RU 2249628 C1

FIELD: ferrous metallurgy.

SUBSTANCE: invention provides round-profiled iron smelted from low-carbon steel composed of, 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, iron and unavoidable impurities - the balance. When following relationships are fulfilled: 12/C-Mn/0.02 ≥ 27; 0.46 ≥ 6V+8Nb ≥ 0.22; Ca/S ≥ 0.065, rolled iron has following characteristics: maximum degree of pollution with nonmetal inclusions, in particular sulfides, oxides, silicates, and nitrides, does not exceed 3 points for each type of inclusions; longitudinally uniform spheroidized structure composed of at least 80% grainy perlite; effective grain size 5-10 points; diameter 10-25 mm; carbon-free layer not exceeding 1.5% of diameter; cold setting value at least 1/3 height; point of maximum load not higher than 550 MPa; relative elongation at least 20%; and relative contraction at least 60%.

EFFECT: ensured optimal conditions for cold die forging of high-strength geometrically complex fastening members and simultaneously ensured improved characteristics of in-process plasticity and low level of stray hardening.

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RU 2 249 628 C1

Authors

Bobylev M.V.

Ugarov A.A.

Shljakhov N.A.

Potapov I.V.

Gontaruk E.I.

Lekhtman A.A.

Kulapov A.N.

Stepanov N.V.

Dates

2005-04-10Published

2003-12-26Filed