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Machining process of Qquaternary marine mooring chain steel with large specification and high performance

A processing technology and mooring chain technology, which is applied in the field of large-scale high-performance grade 4 marine mooring chain steel and its processing technology, can solve the problems of unsatisfactory heat treatment process and insufficient performance of mooring chain steel, and achieve high and low temperature toughness , low yield ratio, good welding performance

Active Publication Date: 2013-05-29
NANJING IRON & STEEL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to propose a large-scale high-performance four-grade marine mooring chain steel and its processing technology in view of the above shortcomings of the existing technology, which can solve the insufficient performance and heat treatment process of the existing mooring chain steel Unsatisfactory problems, comprehensively improve the performance of mooring chain steel after overall heat treatment, tensile strength ≥ 860MPa, yield ratio ≤ 0.92, elongation ≥ 12%, reduction of area ≥ 50%, Charpy impact energy Akv at -20°C ≥50J

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The large-scale high-performance four-grade marine mooring chain steel in this embodiment has a wt.% component content: C: 0.25%, Si: 0.369%, Mn: 1.74%, Cr: 1.34 %, Mo: 0.33%, Ti: 0.018%, S: 0.005%, P: 0.010%, and the balance is Fe.

[0033] The processing technology of the large-scale high-performance four-grade marine mooring chain steel of this embodiment includes smelting, forging and heat treatment,

[0034] (1) Smelting: Smelting in a vacuum intermediate frequency induction furnace, maintaining a high vacuum degree during the smelting process, and the vacuum degree is generally controlled at 0.13Pa. To prevent the entry of harmful elements, it is necessary to limit the smelting parameters, the refining temperature is controlled at 1590°C, and the refining time is about 12 minutes; compared with electric arc furnace smelting, vacuum induction furnace smelting has low cost, high efficiency, simple operation, and the furnace Temperature can be accurately controlled....

Embodiment 2

[0039] The large-scale high-performance four-grade marine mooring chain steel in this embodiment has a composition content wt.% of: C: 0.22%, Si: 0.33%, Mn: 1.58%, Cr: 0.87%, Mo: 0.32%, Ti : 0.03%, Nb: 0.03%, Al: 0.019%, S: 0.002%, P: 0.008%, and the balance is Fe.

[0040] (1) Smelting: Smelting in a vacuum intermediate frequency induction furnace, maintaining a high vacuum degree during the smelting process, and the vacuum degree is generally controlled at 0.45Pa. To prevent the entry of harmful elements, it is necessary to limit the smelting parameters, the refining temperature is controlled at 1600°C, and the refining time is about 15 minutes; compared with electric arc furnace smelting, vacuum induction furnace smelting has low cost, high efficiency, simple operation, and the furnace Temperature can be accurately controlled. Vacuum intermediate frequency induction furnace smelts steel types, achieves degassing, alloying, adjusting components, etc., and can produce high-q...

Embodiment 3

[0045] The large-scale high-performance four-grade marine mooring chain steel of this embodiment has a composition content wt.% of: C: 0.21%, Si: 0.32%, Mn: 1.49%, Cr: 1.18%, Mo: 0.36%, Ti : 0.0197%, Nb: 0.02%, Al: 0.035%, S: 0.002%, P: 0.010%, and the balance is Fe.

[0046] (1) Smelting: Smelting in a vacuum intermediate frequency induction furnace, maintaining a high vacuum degree during the smelting process, and the vacuum degree is generally controlled at 0.67Pa. To prevent the entry of harmful elements, the smelting parameters need to be limited, the refining temperature is controlled at 1620°C, and the refining time is about 17 minutes; compared with electric arc furnace smelting, vacuum induction furnace smelting has low cost, high efficiency, simple operation, and the furnace Temperature can be accurately controlled. Vacuum intermediate frequency induction furnace smelts steel types to achieve degassing, alloying, and composition adjustment. Continuous casting slabs...

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Abstract

The present invention is a low -carbon and low alloy steel field, involving a large -scale high -performance four -level section of marine bang chain steel and its processing technology.Mn: 1.40%~ 1.80%, CR: 0.80%to 1.40%, MO: 0.30%~ 0.40%, TI: 0.01%~ 0.02%, AL: 0.02%~ 0.06%, CU ≤ 0.25%, S ≤ 0.006%, S ≤ 0.006%,, S ≤ 0.006%,, S ≤ 0.006%,, S ≤ 0.006%.P ≤ 0.010%, the balance is Fe.The invention is optimized by composition and adopts the alloy system of MNCRMOSICU to reduce the total amount of alloy elements. The specific measures are: without Ni, reduce MO, increase MN and SI, and add CU design ideas.Monograph using frequency induction furnaces in vacuum to ensure that it has a high degree of vacuum and purity.Forging and processing the generous blank obtained by smelting into φ150mm, it can get the same performance as the rolling state.The round steel produced by the present invention has high quenchability. At the same time, its carbon volume and cold crack sensitive parameters are not much different from the series of steel (Ni content of 0.6 to 1.2%), but the cost is greatly reduced.

Description

technical field [0001] The invention belongs to the field of low-carbon and low-alloy steels, and in particular relates to a large-scale high-performance grade four marine mooring chain steel and a processing technology thereof. Background technique [0002] In recent years, with the in-depth development of marine resources, the number of marine facilities for deep-sea oil extraction and marine exploration has increased globally, and the demand for large-diameter mooring chains of 60mm to 160mm to moor these facilities has also increased. On the other hand, because the mooring chain steel is mainly used in the marine environment, it has been immersed in seawater for a long time, and the service conditions are extremely harsh. Therefore, the steel for mooring chains requires not only high strength and good toughness, but also seawater corrosion resistance, Anti-fatigue, wear resistance and other properties. At present, in order to ensure its high performance, the four-stage ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/28C22C38/38C22C33/04C21D8/00
Inventor 李英奎袁晓敏李旭何宜柱王发仓斯松华
Owner NANJING IRON & STEEL CO LTD