Tin brass strip and manufacturing method thereof

Abstract

The invention discloses a tin brass strip and a manufacturing method thereof, and belongs to the technical field of copper alloy. The tin brass strip disclosed by the invention contains the following components in percentage by weight: 73-77% of copper, 0.5-1.5% of tin, less than or equal to 0.3% of iron, less than or equal to 0.3% of nickel, less than or equal to 0.01% of lead, and the balance of zinc. The tensile strength of the tin brass strip disclosed by the invention can be above 800 MPa; the yield strength of the tin brass strip can be above 760 MPa; the electric conductivity of the tin brass strip is about 25% AICS; furthermore, the cost of the tin brass strip is nearly 20,000 Yuan lower than that of C5210; the excellent characteristics of being high in tensile strength, yield strength and elasticity, excellent in electric conductivity, resistant in stress relaxation property and stress corrosion cracking property, low in cost and the like required by materials for electric and electronic parts can be completely satisfied.

Description

technical field

[0001] The invention discloses a tin brass strip and a manufacturing method thereof, belonging to the technical field of copper alloys. Background technique

[0002] In recent years, with the development of the electronics industry, the connectors of electrical and electronic components tend to be miniaturized and thinned. High electrical conductivity, anti-creep characteristics.

[0003] In the case of connectors, the bending part is required to have the strength not to be plastically deformed when plugging and unplugging. The tensile strength required for crimping and fitting of wires is above 650MPa, preferably above 700MPa, more preferably above 750MPa, and the yield strength is required to be above 600MPa, preferably above 650MPa, preferably above 700MPa.

[0004] In the past, copper alloys for connectors mostly used ordinary brass and tin phosphor bronze. Among them, brass is used as a low-price material, but the typical tensile strength and yield st...

Examples

Embodiment 1

[0019] A method for manufacturing a tin brass strip, comprising the steps of:

[0020] (1) Selection of raw materials: The raw materials are composed of tinned brass scraps, electrolytic copper, H70 brass scraps, and tin bars. Among them, the weight of electrolytic copper and tin bars accounts for 30% of the total weight of raw materials, and the balance is It is H70 brass scrap and tinned brass scrap, and the weight ratio between electrolytic copper, H70 brass scrap and tin bar is 50:55:1. (2) Melting, the temperature of the melting furnace converter is controlled at 1170±15°C; (3) Horizontal continuous casting; casting process: pull 10-15mm, push back one (0-1.6) mm and stop for 2-5 seconds, push back two ( 1-1.8mm), holding furnace drawing control temperature 1075±10℃, slab thickness 16mm, holding furnace liquid level difference less than 20cm, temperature difference of slab end surface controlled below 50℃; (4) milling (5) Winding (14.5→13.0mm); (6) First annealing; (7) R...

Embodiment 2

[0026] A method for manufacturing a tin brass strip, comprising the steps of:

[0027](1) Selection of raw materials: The raw materials are composed of tinned brass scraps, electrolytic copper, H70 brass scraps, and tin bars. Among them, the weight of electrolytic copper and tin bars accounts for 25% of the total weight of raw materials, and the balance is It is H70 brass scrap and tinned brass scrap, and the weight ratio between electrolytic copper, H70 brass scrap and tin bar is 50:55:1. (2) Melting, melting furnace converter control temperature 1180±15°C; (3) Horizontal continuous casting; casting process: pull 10-15mm, push back one (0-1.6) mm and stop for 2-5 seconds, push back two (1) -1.8mm), holding furnace drawing control temperature 1080±10°C, slab thickness 16mm, holding furnace liquid level difference less than 20 cm, and casting slab end face temperature difference below 50°C; (4) Face milling , milling off 0.7-0.8mm on the upper and lower sides; (5) coiling (14....

Embodiment 3

[0033] A method for manufacturing a tin brass strip, comprising the steps of:

[0034] (1) Selection of raw materials: The raw materials are composed of tinned brass scraps, electrolytic copper, H70 brass scraps, and tin bars. Among them, the weight of electrolytic copper and tin bars accounts for 22% of the total weight of raw materials, and the balance is It is H70 brass scrap and tinned brass scrap, and the weight ratio between electrolytic copper, H70 brass scrap and tin bar is 50:55:1. (2) Melting, melting furnace converter control temperature 1185±15°C; (3) Horizontal continuous casting; casting process: pull 10-15mm, push back one (0-1.6) mm and stop for 2-5 seconds, push back two (1) -1.8mm), holding furnace drawing control temperature 1085±10°C, slab thickness 16mm, holding furnace liquid level difference is controlled at less than 20 cm, and the temperature difference at the end face of the slab is controlled below 50°C; (4) Face milling , milling off 0.7-0.8mm on t...

technical field

[0001] The invention discloses a tin brass strip and a manufacturing method thereof, belonging to the technical field of copper alloys. Background technique

[0002] In recent years, with the development of the electronics industry, the connectors of electrical and electronic components tend to be miniaturized and thinned. High electrical conductivity, anti-creep characteristics.

[0003] In the case of connectors, the bending part is required to have the strength not to be plastically deformed when plugging and unplugging. The tensile strength required for crimping and fitting of wires is above 650MPa, preferably above 700MPa, more preferably above 750MPa, and the yield strength is required to be above 600MPa, preferably above 650MPa, preferably above 700MPa.

[0004] In the past, copper alloys for connectors mostly used ordinary brass and tin phosphor bronze. Among them, brass is used as a low-price material, but the typical tensile strength and yield st...

Examples

Embodiment 1

[0019] A method for manufacturing a tin brass strip, comprising the steps of:

[0020] (1) Selection of raw materials: The raw materials are composed of tinned brass scraps, electrolytic copper, H70 brass scraps, and tin bars. Among them, the weight of electrolytic copper and tin bars accounts for 30% of the total weight of raw materials, and the balance is It is H70 brass scrap and tinned brass scrap, and the weight ratio between electrolytic copper, H70 brass scrap and tin bar is 50:55:1. (2) Melting, the temperature of the melting furnace converter is controlled at 1170±15°C; (3) Horizontal continuous casting; casting process: pull 10-15mm, push back one (0-1.6) mm and stop for 2-5 seconds, push back two ( 1-1.8mm), holding furnace drawing control temperature 1075±10℃, slab thickness 16mm, holding furnace liquid level difference less than 20cm, temperature difference of slab end surface controlled below 50℃; (4) milling (5) Winding (14.5→13.0mm); (6) First annealing; (7) R...

Embodiment 2

[0026] A method for manufacturing a tin brass strip, comprising the steps of:

[0027](1) Selection of raw materials: The raw materials are composed of tinned brass scraps, electrolytic copper, H70 brass scraps, and tin bars. Among them, the weight of electrolytic copper and tin bars accounts for 25% of the total weight of raw materials, and the balance is It is H70 brass scrap and tinned brass scrap, and the weight ratio between electrolytic copper, H70 brass scrap and tin bar is 50:55:1. (2) Melting, melting furnace converter control temperature 1180±15°C; (3) Horizontal continuous casting; casting process: pull 10-15mm, push back one (0-1.6) mm and stop for 2-5 seconds, push back two (1) -1.8mm), holding furnace drawing control temperature 1080±10°C, slab thickness 16mm, holding furnace liquid level difference less than 20 cm, and casting slab end face temperature difference below 50°C; (4) Face milling , milling off 0.7-0.8mm on the upper and lower sides; (5) coiling (14....

Embodiment 3

[0033] A method for manufacturing a tin brass strip, comprising the steps of:

[0034] (1) Selection of raw materials: The raw materials are composed of tinned brass scraps, electrolytic copper, H70 brass scraps, and tin bars. Among them, the weight of electrolytic copper and tin bars accounts for 22% of the total weight of raw materials, and the balance is It is H70 brass scrap and tinned brass scrap, and the weight ratio between electrolytic copper, H70 brass scrap and tin bar is 50:55:1. (2) Melting, melting furnace converter control temperature 1185±15°C; (3) Horizontal continuous casting; casting process: pull 10-15mm, push back one (0-1.6) mm and stop for 2-5 seconds, push back two (1) -1.8mm), holding furnace drawing control temperature 1085±10°C, slab thickness 16mm, holding furnace liquid level difference is controlled at less than 20 cm, and the temperature difference at the end face of the slab is controlled below 50°C; (4) Face milling , milling off 0.7-0.8mm on t...

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