Heat treatment process for lowering yield ratio of ultra-high-strength marine steel

An ultra-high-strength, marine steel technology, applied in the field of ultra-high-strength marine steel heat treatment, can solve the problem of reducing the yield-strength ratio and high yield-strength ratio of ultra-high-strength marine steel, and achieve lower yield ratio and lower yield. Intensity, high intensity effect

Active Publication Date: 2016-03-30
SUQIAN NANGANG JINXIN STEEL ROLLING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This technology improves properties by controllably cooling certain materials during manufacturing processes such as hot rolling mills. By adjusting specific parameters like processing conditions (pressure), heat treatment levels, etc.) these techniques help prevent damage from thermal stress cracking caused when forming steels with higher tensiles than usual due to their lower yield ratios compared to traditional methods involving prolonged exposures to elevated temperatures. Additionally, this method allows for controlled formation of different types of structures called austinites, which improve its overall performance over conventional ways.

Problems solved by technology

This patented technical problem addressed in this patent relates to improving the performance of advanced materials called hypertontic Structure Thick Plate(HTPS). These alloys offer unique fracture behavior at extremely low tensiles undergoes severe deformation when subjected to stress loads during use or storage conditions due to their ability to resist damage from environmental factors like saltwater environments without increasing costs associated therewith. Existing methods involve multiple steps involving different types of thermal treatments, resulting in decreased productivity efficiency.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] This embodiment is a heat treatment process for reducing the yield ratio of ultra-high-strength marine steel, using critical temperature quenching + high temperature short-time tempering, that is, the quenching temperature is Ac3±20°C, and the holding time is 1.4-1.8min / mm; The tempering temperature is Ac1?(120-150)℃, and the holding time is 0.5-1.0min / mm; the quenching heating is carried out in the normalization furnace, and the water cooling process is completed, and the tempering heating is carried out in the tempering furnace, and the air cooling process completed. The tensile and impact properties of the ultra-high-strength marine steel produced in this embodiment meet the requirements of classification societies and GB712-2011, and the yield ratio is 0.91-0.93.

Embodiment 2

[0021] This embodiment is a manufacturing method of a heat treatment process for reducing the yield ratio of ultra-high-strength marine steel, which adopts critical temperature quenching + high temperature short-time tempering, that is, the quenching temperature is Ac3±20°C, and the holding time is 1.4-1.8min / mm; tempering temperature is Ac1? (100-120) ℃, holding time is 1.0-1.5min / mm; quenching heating is carried out in the normalization furnace, the water cooling process is completed, and tempering heating is carried out in the tempering furnace , completed during air cooling. The tensile and impact properties of the ultra-high-strength marine steel produced in this embodiment meet the requirements of classification societies and GB712-2011, and the yield ratio is 0.90-0.920.

Embodiment 3

[0023] This embodiment is a manufacturing method of a heat treatment process for reducing the yield ratio of ultra-high-strength marine steel, which adopts critical temperature quenching + high temperature short-time tempering, that is, the quenching temperature is Ac3±20°C, and the holding time is 1.4-1.8min / mm; tempering temperature is Ac1? (80-100) ℃, holding time is 1.5-2.0min / mm; quenching heating is carried out in the normalization furnace, the water cooling process is completed, and tempering heating is carried out in the tempering furnace , completed during air cooling. The tensile and impact properties of the ultra-high-strength marine steel produced in this embodiment meet the requirements of classification societies and GB712-2011, and the yield ratio is 0.88-0.91.

[0024]The ultra-high-strength marine steel with low yield ratio produced in Example 1-3 is quenched at critical temperature + tempered at high temperature for a short time, that is, the quenching temp

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Abstract

Disclosed is a heat treatment process for lowering the yield ratio of ultra-high-strength marine steel. Critical temperature quenching and high temperature short time tempering are adopted to obtain the low-yield-ratio ultra-high-strength marine steel, that is to say, the quenching temperature is Ac3+/-20 DEG C, the heat preservation time for quenching is 1.4-1.8 min/mm, the tempering temperature is Acl-(80-150) DEG C, and the heat preservation time for tempering is 0.5-2.0 min/mm. According to the heat treatment process, under the circumstance that matching of the strength and toughness of a steel plate is ensured, the yield ratio of the ultra-high-strength marine steel is significantly lowered, thereby completely meeting the requirements of a ship structure, an ocean platform, etc. which need the ultra-high-strength marine steel of the 420 MPa-690 MPa level or above the 690 MPa level.

Description

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Claims

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Application Information

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Owner SUQIAN NANGANG JINXIN STEEL ROLLING CO LTD
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