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Two-time quenching process of R6-grade mooring chain

A mooring chain, re-quenching technology, applied in the field of marine mooring chains, can solve problems such as performance fluctuations, and achieve the effect of improving mechanical properties

Inactive Publication Date: 2020-04-10
JIANGSU ASIAN STAR ANCHOR CHAIN +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the R6 mooring chain has certain heat treatment sensitivity, a slight difference in process design or execution will lead to performance fluctuations

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0014] 1. Heat the chain to 930-980°C for quenching, keep it warm for 150-200 minutes, and then carry out water cooling. The running speed of the chain during quenching is 0.12-0.20m / min.

[0015] After the chain enters the quenching furnace, it firstly uses the rising furnace gas to preheat the chain link through the preheating zone to make the temperature reach 300~500°C; then enters the rapid heating zone to raise the temperature to above 700°C, and finally enters the heat preservation zone The uniform temperature is equivalent to the heat preservation of ordinary chamber furnaces or trolley furnaces.

[0016] The quenching temperature is higher than the general quenching temperature by more than 100°C, which not only improves the strength of the chain, but also makes the composition of the chain weld more uniform, improves the toughness and fracture toughness of the chain weld, and reduces the performance between the ring back and the weld difference to meet the requiremen...

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Abstract

Provided is a two-time quenching process of a R6-grade mooring chain. The first quenching process is set as the heating zone at the temperature of 950-1,000 DEG C, and the heat preservation zone is atthe temperature of 930-980 DEG C; and the second quenching process is set as the heating zone at the temperature of 930-980 DEG C, and the heat preservation zone is at the temperature of 900-950 DEGC. In the manufacturing process of the R6-grade mooring chain, the quenching and tempering temperatures is controlled, so that the mechanical properties of the material and the chain ring manufacturedby the material are greatly improved. In order to meet the requirement of the R 6-stage mooring chain heat treatment, the heating temperature and the movement speed of the chain are strictly controlled, enough heat can be absorbed in the quenching process of the chain, and the transformation of austenite is fully realized; meanwhile, when the tempering treatment is guaranteed, the chain can achieve the expected transition of the internal tissue of the material. The two-time quenching process of the R6-grade mooring chain can be widely applied to the batch production and manufacturing processof the R6 mooring chain on a deep sea drilling platform.

Description

technical field [0001] The invention relates to a marine mooring chain, in particular to an R6 grade mooring chain and its heat treatment process. Background technique [0002] With the development of ocean development and offshore industry, the market puts forward higher requirements for mooring chains. R6 grade mooring chain is a newly developed mooring chain with high strength and toughness. Its tensile strength is ≥1110MPa, the V-notch impact value of the ring back is ≥60J, and the weld seam is ≥44J. Since R6 grade mooring chains have certain heat treatment sensitivity, slight differences in process design or execution will lead to performance fluctuations. It can be seen that the heat treatment process is one of the key technologies in the manufacturing process of R6 mooring chains. Therefore, it is necessary to control the strength of the weld seam and the base metal of the R6 mooring chain link through a reasonable heat treatment process, so that it meets the requir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/18C21D9/00
CPCC21D1/18C21D9/0087
Inventor 曾强徐立新张明陶安祥陶良凤陶兴张卫新李剑
Owner JIANGSU ASIAN STAR ANCHOR CHAIN
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