High strength cold finished bars
AssigneeJones & Laughlin Steel Corporation
InventorsJohn H. Bucher, John F. Butler, John F. Held
Life of this patent
Estimating the term…
Abstract
High strength, cold finished steel bars strengthened through the addition of from 0.05% to 0.15% vanadium and 0.001% to 0.025% nitrogen are produced by a series of steps involving hot rolling, cold drawing, and heat-treatment.
Claims11
A method for producing a high strength, cold finished steel bar, comprising:
- a. hot rolling a killed steel consisting essentially of 0.30% to 0.65% carbon, 0.30% to 1.65% manganese, 0.05% maximum sulfur, 0.01% to 0.35% silicon, 0.01% maximum aluminum, 0.07% to 0.15% vanadium, 0.008% to 0.025% nitrogen, balance iron, to form a bar having a yield strength between about 70 and 100 k.s.i.;
- and
- b. cold drawing said bar to effect from 4% to 25% reduction in its area and thereby obtain a minimum yield strength 125 k.s.i., a minimum total elongation of 5%, a minimum reduction in area of 15%, good toughness, and good abrasion resistance.
A method for producing a high strength, cold finished steel bar, comprising:
- a. hot rolling a killed steel consisting essentially of 0.45% to 0.65% carbon, 0.30% to 1.65% manganese, 0.05% maximum sulfur, 0.01% to 0.35% silicon, 0.01% maximum aluminum, 0.07% to 0.15% vanadium, 0.008% to 0.025% nitrogen, balance iron, to form a bar having a yield strength between about 70 and 100 k.s.i.;
- and
- b. cold drawing said bar to effect from 20% to 25% reduction in its area and thereby obtain a minimum yield strength 150 k.s.i., a minimum total elongation of 5%, a minimum reduction in area of 15%, good toughness, and good abrasion resistance.
A method for producing a high strength, cold finished steel bar, comprising:
- a. hot rolling a killed steel consisting essentially of 0.30% to 0.65% carbon, 0.30% to 1.65% manganese, 0.05% maximum sulfur, 0.01% to 0.35% silicon, 0.01% maximum aluminum, 0.05% to 0.15% vanadium, 0.001% to 0.025% nitrogen, up to 3.0% nickel, up to 1.5% chromium, up to 0.5% molybdenum, balance iron, to form a bar having a yield strength in excess of about 100 k.s.i.;
- b. annealing said hot rolled bar for 5 to 20 hours at a temperature between about 1150.degree. F. to 1350.degree. F. to lower the yield strength to between about 90 k.s.i. and 115 k.s.i.;
- and
- c. cold drawing said bar to effect from 4% to 25% reduction in its area and thereby obtain a minimum yield strength of 125 k.s.i., a minimum total elongation of 10%, a minimum reduction in area of 35%, good toughness, and good abrasion resistance.
A method for producing a high strength, cold finished steel bar, comprising:
- a. hot rolling a killed steel consisting essentially of 0.30% to 0.65% carbon, 1.35% to 1.65% manganese, 0.07% to 0.4% sulfur, 0.01% to 0.35% silicon, 0.01% maximum aluminum, 0.05% to 0.15% vanadium, 0.001% to 0.025% nitrogen, up to 3.0% nickel, up to 1.5% chromium, up to 0.5% molybdenum, balance iron, to form a bar having a yield strength in excess of about 100 k.s.i.;
- b. annealing said hot rolled bar for 5 to 20 hours at a temperature between about 1150.degree. F. to 1350.degree. F. to lower the yield strength to between about 90 k.s.i. and 115 k.s.i.;
- and
- c. cold drawing said bar to effect from 4% to 25% reduction in its area and thereby obtain a minimum yield strength of 125 k.s.i., a minimum total elongation of 10%, a minimum reduction in area of 35%, good toughness, and good abrasion resistance.
A method for producing a high strength, cold finished steel bar, comprising:
- a. hot rolling a killed steel consisting essentially of 0.30% to 0.65% carbon, 0.30% to 1.65% manganese, 0.05% maximum sulfur, 0.01% to 0.35% silicon, 0.01% maximum aluminum, 0.07% to 0.15% vanadium, 0.008% to 0.025% nitrogen, up to 3.0% nickel, up to 1.5% chromium, up to 0.5% molybdenum, balance iron, to form a bar having a yield strength in excess of about 100 k.s.i.;
- b. annealing said hot rolled bar for 5 to 20 hours at a temperature between about 1150.degree. F. to 1350.degree. F. to lower the yield strength to between about 90 k.s.i. and 115 k.s.i.;
- and
- c. cold drawing said bar to effect from 15% to 25% reduction in its area and thereby obtain a minimum yield strength of 150 k.s.i., a minimum total elongation of 5%, a minimum reduction in area of 10%, good toughness, and good abrasion resistance.
A high strength steel bar in the cold drawn metallurgical condition consisting essentially of 0.30% to 0.65% carbon, 0.30% to 1.65% manganese, 0.05% maximum sulfur, 0.01% to 0.35% silicon, 0.01% maximum aluminum, 0.07% to 0.15% vanadium, 0.008% to 0.025% nitrogen, balance iron;
- said steel bar having a minimum yield strength of 125 k.s.i., a minimum total elongation of 5%, a minimum reduction in area of 15%, good toughness, and good abrasion resistance.
A high strength steel bar in the cold drawn metallurgical condition consisting essentially of 0.30% to 0.65% carbon, 0.30% to 1.65% manganese, 0.05% maximum sulfur, 0.01% to 0.35% silicon, 0.01% maximum aluminum, 0.07% to 0.15% vanadium, 0.008% to 0.025% nitrogen, up to 3.0% nickel, up to 1.5% chromium, up to 0.5% molybdenum, balance iron, said steel bar having a minimum yield strength of 150 k.s.i., a minimum total elongation of 5%, a minimum reduction in area of 10%, good toughness, and good abrasion resistance.
Dependencies are inferred from the claim text.