A high-strength wire rod with excellent low-temperature performance and its manufacturing method

A low-temperature performance and manufacturing method technology, which is applied in the field of high-strength wire rod and its manufacturing, can solve the problems of inability to guarantee engineering safety and reduced plasticity and toughness, and achieve the effect of improving safety reliability and low-temperature plasticity and toughness

Active Publication Date: 2017-08-25
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] As the strength of steel wire continues to increase, its plasticity and toughness decrease, especially in low-temperature application environments. Or how to further improve the strength of the steel wire

Method used

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  • A high-strength wire rod with excellent low-temperature performance and its manufacturing method
  • A high-strength wire rod with excellent low-temperature performance and its manufacturing method
  • A high-strength wire rod with excellent low-temperature performance and its manufacturing method

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Embodiment Construction

[0038] The present invention will be further described below in conjunction with embodiment.

[0039] Table 1 shows the chemical compositions of the wire rods of Examples 1-9 of the present invention and comparative alloys.

[0040]

[0041] The manufacture method of the wire rod of embodiment 1-9 is as follows:

[0042] Embodiment 1, 2, 5, 7, 9 and comparative example 1 adopt electric furnace+LF+VD smelting, embodiment 3, 4, 6, 8 and comparative example 2, 3 adopt converter+LF+RH process to smelt, control steel The S element content is lower than 0.01%, while the O content in the steel is controlled to be lower than 20ppm, the N content is lower than 45ppm, and the H content is lower than 2ppm. Feed Si-Ca wire before tapping. VD or RH vacuum treatment times were 35 and 40 minutes, respectively. A billet continuous casting machine is used to cast the alloy into a bloom, and the section size of the billet is 250-500×250-500mm. The casting temperature of the tundish of Ex...

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Abstract

A high-strength wire rod with excellent low-temperature performance and a manufacturing method thereof, the composition weight percent of which is: C: 0.82-0.90%, Si: 0.20-0.40%, Mn: 0.76-1.2%, Ni: 0.52-1.3%, Cu: 0.01‑0.35%, Cr: 0.15‑0.30%, Mo: 0.01‑0.20%, V: 0.01‑0.15%, Nb: 0.01‑0.06%, Al: 0.012‑0.045%, Ca: 0.0005‑0.003%, S :≤0.01%, the rest is Fe and unavoidable impurities; among them, Ni+0.95Mn+0.75Cu≥1.30%, Ni / Cu≥2.0, Cr+1.2Mo≤0.40%, (Cr+1.2Mo)×(V+ 1.5Nb) ≥ 0.005, and Ca / S ≥ 0.1, the proportion of sorbite pellets with a lamellar spacing of 90-250nm in the wire rod structure is higher than 95%, and the diameter of the pellets is 15-55um. The steel wire processed by the invention still has good plasticity and toughness at low temperature, and can meet the application requirements of the low temperature environment.

Description

technical field [0001] The invention relates to low-alloy steel wire rods, in particular to a high-strength wire rod with excellent low-temperature performance and a manufacturing method thereof, a low-alloy steel wire rod for cold-drawing high-strength steel wires, and the cold-drawn steel wires produced have Good low temperature performance, can be used in petrochemical and construction projects under low temperature environment. Background technique [0002] High-strength steel wire is widely used in the construction of bridges, viaducts, tunnels, petrochemical, nuclear power and other projects. At present, the strength is mainly improved by cold drawing of hot-rolled wire rods, alloy strengthening and work hardening. The higher the strength of the steel wire, the less materials used in engineering construction, which can achieve the purpose of saving costs. Domestic and foreign iron and steel production enterprises, steel wire processing enterprises and research institu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/48C22C33/04C21D8/02
Inventor 姚赞张忠铧金峰
Owner BAOSHAN IRON & STEEL CO LTD
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