Continuous treatment of cold-rolled carbon manganese steel
AssigneeSignode Corporation
InventorsGeorge Krauss, Philip M. Roberts
Life of this patent
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Abstract
Cold-rolled, non-microalloyed carbon manganese steel (0.04% to 0.15% C, 0.25% to 0.70% Mn) is preheated at 700.degree. to 1000.degree. F., heated to 1625.degree. to 1725.degree. F., and quenched to 650.degree. to 750.degree. F. in a continuous process to develop minimum yield strength of 40,000 psi, minimum tensile strength of 50,000 psi, and 22% minimum elongation.
Claims8
A method of treating steel in a continuous process wherein the steel is cold reduced and has a composition of from about 0.04% to 0.15% by weight carbon and 0.25% to 0.70% by weight manganese, without the addition of microalloying agents for the purpose of achieving enhanced mechanical properties, comprising the steps of:
- (1) preheating the steel to a temperature in the range of 700.degree. to 1000.degree. F.;
- (2) heating the steel to a temperature in the range of 1625.degree. to 1725.degree. F.;
- and
- (3) quenching the steel at a temperature in the range of 650.degree. to 750.degree. F.;
- the treated steel having a minimum of 40,000 psi yield strength;
- 50,000 psi tensile strength;
- and 22% elongation.
A method for treating steel in a continuous process wherein the steel is cold reduced and has a composition of from about 0.10% to 0.15% by weight carbon and 0.25% to 0.70% by weight manganese, without the addition of microalloying agents for the purpose of achieving enhanced mechanical properties, comprising the steps of:
- (1) preheating the steel to a temperature in the range of 700.degree. to 1000.degree. F.;
- (2) heating the steel to a temperature in the range of 1625.degree. to 1725.degree. F.;
- and
- (3) quenching the steel at a temperature in the range of 650.degree. to 750.degree. F.;
- the treated steel having a minimum of 50,000 psi yield strength;
- 70,000 psi tensile strength;
- and 22% elongation.
A method of treating steel in a continuous process wherein the steel is cold reduced and has a composition of from about 0.04% to 0.07% by weight carbon and 0.25% to 0.40% by weight manganese, without the addition of microalloying agents for the purpose of achieving enhanced mechanical properties, comprising the steps of:
- (1) preheating the steel to a temperature in the range of 700.degree. to 1000.degree. F.;
- (2) heating the steel to a temperature in the range of 1625.degree. to 1725.degree. F.;
- and
- (3) quenching the steel at a temperature in the range of 650.degree. to 750.degree. F.;
- the treated steel having a minimum of 50,000 psi yield strength;
- 55,000 psi tensile strength;
- and 25% elongation.
A method of treating steel sheet and strip material in a continuous process wherein the steel material is cold reduced and has a composition of from about 0.04% to 0.15% by weight carbon and 0.25% to 0.70% by weight manganese, without the addition of microalloying agents for the purpose of achieving enhanced mechanical properties, comprising continuously passing the steel material through:
- a molten lead bath held at a temperature in the range of 700.degree. to 1000.degree. F.;
- a resistance heating stage wherein the material is heated to a temperature in the range of 1625.degree. to 1725.degree. F.;
- and
- a molten lead bath held at a temperature in the range of 650.degree. to 750.degree. F.;
- the treated material having a minimum of 40,000 psi yield strength;
- 50,000 psi tensile strength;
- and 22% elongation.
A method of treating steel sheet or strip material in a continuous process wherein the steel material is cold reduced aluminum killed steel having a composition of from about 0.04% to 0.15% by weight carbon and 0.25% to 0.70% by weight manganese, without the addition of microalloying agents for the purpose of achieving enhanced mechanical properties, comprising continuously passing the steel material through:
- a preheating bath held at a temperature in the range of 700.degree. to 1000.degree. F.;
- a resistance heating stage wherein the material is heated to a temperature in the range of 1625.degree. to 1725.degree. F.;
- and
- a quenching bath held at a temperature in the range of 650.degree. to 750.degree. F.;
- the treated material having a minimum of 40,000 psi yield strength;
- 50,000 psi tensile strength;
- and 22% elongation.
Dependencies are inferred from the claim text.