Chromium-molybdenum low-alloy prestress aluminum-cladding steel wire manufacturing method

Abstract

The present invention discloses a chromium-molybdenum low-alloy prestress aluminum-cladding steel wire manufacturing method, wherein the chromium-nickel-molybdenum alloy structure steel is adopted as a billet material and comprises, by mass, 0.28-0.38% of carbon, 0-0.35% of silicon, 0-0.90% of manganese, 0.80-1.50% of chromium, 3.00-4.00% of nickel, 0.40-0.60% of molybdenum, 0-0.015%of phosphorus, 0-0.015% of sulfur, 0-2.0 ppm of hydrogen, 0.10-0.20% of vanadium, 0-0.025% of titanium, 0-0.20% of copper, 0-0.05% of aluminum, 0-0.50% of residual elements, and the balance of Fe. According to the chromium-molybdenum low-alloy prestress aluminum-cladding steel wire manufacturing method designed by the present invention, strength and toughness of the steel wire can be substantially increased, a corrosion resistance degree of the steel wire can be enhanced, and a service life can be prolonged.

Description

technical field

[0001] The invention relates to a method for manufacturing chromium-molybdenum low-alloy prestressed aluminum-clad steel wire. Background technique

[0002] The prestressed steel wire belongs to the bimetal composite material, and is mainly used in the manufacture of bridge cables. In the prior art, the prestressed steel strand with a smooth surface is often used, which has the problems of serious corrosion and short service life.

[0003] At the same time, the atomic activity of carbon and nitrogen elements in the steel raw material composition is low, and the air mass formed by each atom cannot form a strong interaction with the dislocation, and the dislocation can be activated without providing a large external stress, thus making the performance very unstable. , while the hydrogen content in the steel strand is above 2.0ppm, the steel strand is prone to cracks, thereby inducing hydrogen-induced cracks and hydrogen-induced delayed hysteresis cracks. [00...

Examples

Embodiment 1

[0028] A method for manufacturing chromium-molybdenum low-alloy prestressed aluminum-clad steel wire provided in this embodiment includes the following specific steps:

[0029] Step (1): Using chromium-nickel-molybdenum alloy structural steel as a blank, the chromium-nickel-molybdenum alloy structural steel includes the following components in mass percentages: carbon: 0.28%, silicon: 0%, manganese: 0%, chromium: 0.80%, Nickel: 3.00%, Molybdenum: 0.40%, Phosphorus: 0%, Sulfur: 0%, Hydrogen: 1.0ppm, Vanadium: 0.10%, Titanium: 0%, Copper: 0%, Aluminum: 0%, 0% residual elements, The rest is Fe;

[0030] Smelt and finish-roll the above-mentioned billet to a steel wire billet of the required size, the smelting temperature is 800°C;

[0031] Step (2): Perform hydrogen expansion heat treatment on the steel wire blank obtained in step (1), which specifically includes: heating the steel wire blank obtained in step (1) to 870°C and keeping it for 360 minutes, air cooling to 290°C and k...

Embodiment 2

[0039] This embodiment provides a method for manufacturing chromium-molybdenum low-alloy prestressed aluminum-clad steel wire, including the following specific steps:

[0040] Step (1): Using chromium-nickel-molybdenum alloy structural steel as a blank, the chromium-nickel-molybdenum alloy structural steel includes the following components in mass percentages: carbon: 0.38%, silicon: 0.35%, manganese: 0.90%, chromium: 1.50%, Nickel: 4.00%, Molybdenum: 0.60%, Phosphorus: 0.015%, Sulfur: 0.015%, Hydrogen: 2.0ppm, Vanadium: 0.20%, Titanium: 0.025%, Copper: 0.20%, Aluminum: 0.05%, 0-0.50% residual element, the rest is Fe;

[0041]Smelt and finish-roll the above-mentioned billet to a steel wire billet of the required size, the smelting temperature is 850°C;

[0042] Step (2): Perform hydrogen expansion heat treatment on the steel wire blank obtained in step (1), which specifically includes: heating the steel wire blank obtained in step (1) to 890°C for 360 minutes, air cooling to ...

Embodiment 3

[0049] This embodiment provides a method for manufacturing chromium-molybdenum low-alloy prestressed aluminum-clad steel wire, including the following specific steps:

[0050] Step (1): Using chromium-nickel-molybdenum alloy structural steel as a blank, the chromium-nickel-molybdenum alloy structural steel includes the following components in mass percentages: 0.3% carbon, 0.3% silicon, 0.80% manganese, 1.20% chromium, 3.50% nickel, 0.50% molybdenum, 0.01% phosphorus, 0.01% sulfur, 1.0ppm hydrogen, 0.15% vanadium, 0.02% titanium, 0.15% copper, 0.03% aluminum, 0-0.50% residual elements, the rest is Fe;

[0051] Smelt and finish roll the above-mentioned billet to the steel wire billet of the required size, the smelting temperature is 825°C;

[0052] Step (2): Perform hydrogen expansion heat treatment on the steel wire blank obtained in step (1), which specifically includes: heating the steel wire blank obtained in step (1) to 880°C for 360 minutes, air cooling to 300°C for 180 m...

technical field

[0001] The invention relates to a method for manufacturing chromium-molybdenum low-alloy prestressed aluminum-clad steel wire. Background technique

[0002] The prestressed steel wire belongs to the bimetal composite material, and is mainly used in the manufacture of bridge cables. In the prior art, the prestressed steel strand with a smooth surface is often used, which has the problems of serious corrosion and short service life.

[0003] At the same time, the atomic activity of carbon and nitrogen elements in the steel raw material composition is low, and the air mass formed by each atom cannot form a strong interaction with the dislocation, and the dislocation can be activated without providing a large external stress, thus making the performance very unstable. , while the hydrogen content in the steel strand is above 2.0ppm, the steel strand is prone to cracks, thereby inducing hydrogen-induced cracks and hydrogen-induced delayed hysteresis cracks. [00...

Examples

Embodiment 1

[0028] A method for manufacturing chromium-molybdenum low-alloy prestressed aluminum-clad steel wire provided in this embodiment includes the following specific steps:

[0029] Step (1): Using chromium-nickel-molybdenum alloy structural steel as a blank, the chromium-nickel-molybdenum alloy structural steel includes the following components in mass percentages: carbon: 0.28%, silicon: 0%, manganese: 0%, chromium: 0.80%, Nickel: 3.00%, Molybdenum: 0.40%, Phosphorus: 0%, Sulfur: 0%, Hydrogen: 1.0ppm, Vanadium: 0.10%, Titanium: 0%, Copper: 0%, Aluminum: 0%, 0% residual elements, The rest is Fe;

[0030] Smelt and finish-roll the above-mentioned billet to a steel wire billet of the required size, the smelting temperature is 800°C;

[0031] Step (2): Perform hydrogen expansion heat treatment on the steel wire blank obtained in step (1), which specifically includes: heating the steel wire blank obtained in step (1) to 870°C and keeping it for 360 minutes, air cooling to 290°C and k...

Embodiment 2

[0039] This embodiment provides a method for manufacturing chromium-molybdenum low-alloy prestressed aluminum-clad steel wire, including the following specific steps:

[0040] Step (1): Using chromium-nickel-molybdenum alloy structural steel as a blank, the chromium-nickel-molybdenum alloy structural steel includes the following components in mass percentages: carbon: 0.38%, silicon: 0.35%, manganese: 0.90%, chromium: 1.50%, Nickel: 4.00%, Molybdenum: 0.60%, Phosphorus: 0.015%, Sulfur: 0.015%, Hydrogen: 2.0ppm, Vanadium: 0.20%, Titanium: 0.025%, Copper: 0.20%, Aluminum: 0.05%, 0-0.50% residual element, the rest is Fe;

[0041]Smelt and finish-roll the above-mentioned billet to a steel wire billet of the required size, the smelting temperature is 850°C;

[0042] Step (2): Perform hydrogen expansion heat treatment on the steel wire blank obtained in step (1), which specifically includes: heating the steel wire blank obtained in step (1) to 890°C for 360 minutes, air cooling to ...

Embodiment 3

[0049] This embodiment provides a method for manufacturing chromium-molybdenum low-alloy prestressed aluminum-clad steel wire, including the following specific steps:

[0050] Step (1): Using chromium-nickel-molybdenum alloy structural steel as a blank, the chromium-nickel-molybdenum alloy structural steel includes the following components in mass percentages: 0.3% carbon, 0.3% silicon, 0.80% manganese, 1.20% chromium, 3.50% nickel, 0.50% molybdenum, 0.01% phosphorus, 0.01% sulfur, 1.0ppm hydrogen, 0.15% vanadium, 0.02% titanium, 0.15% copper, 0.03% aluminum, 0-0.50% residual elements, the rest is Fe;

[0051] Smelt and finish roll the above-mentioned billet to the steel wire billet of the required size, the smelting temperature is 825°C;

[0052] Step (2): Perform hydrogen expansion heat treatment on the steel wire blank obtained in step (1), which specifically includes: heating the steel wire blank obtained in step (1) to 880°C for 360 minutes, air cooling to 300°C for 180 m...