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Ultrahigh steel Q960E thick plate and manufacturing method

A manufacturing method and ultra-high technology, applied in the field of ultra-high-strength steel Q960E thick plate and manufacturing, can solve the problems of ultra-high-strength steel without substantive reports, minimal practical engineering application of products, prone to engineering accidents, etc., so as to reduce overheating. Sensitivity, reduction of hardenability, effect of improving weldability

Inactive Publication Date: 2018-12-18
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Ultra-high-strength steel is a resource-saving and high-tech and high-value-added product. With the vigorous development of domestic large-scale projects, high-strength steel of Q890D and above grades is widely used in construction machinery, mining, and hoisting mines. Vehicles, offshore platforms, etc. have been vigorously applied. Its characteristics are: simple structure, light weight, high safety, capable of carrying large dynamic and static loads, and long service time; however, due to the thickness of domestic billets, Large-thickness structural parts can only be replaced by conventional Q345-Q6900 series low-alloy structural steels. Due to their low strength, such structural steels are not strong enough to be used under harsh service conditions and are prone to engineering accidents. Therefore, for large-scale For engineering structural steel parts, domestic enterprises can only import ultra-high-strength steel with large thickness at high prices;
[0003] Many domestic steel mills are studying the production process of Q960 and above ultra-high-strength steel, but there is no substantive report on large-thickness Q960E ultra-high-strength steel, and the actual engineering application of the products in the published patent documents is even less

Method used

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  • Ultrahigh steel Q960E thick plate and manufacturing method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A kind of ultra-high steel Q960E thick plate provided in this embodiment, its chemical composition and mass percentage are as follows: C: 0.16%, Si: 0.24%, Mn: 1.13%, P≤0.008%, S≤0.002%, Cr: 0.45 %, Mo: 0.50%, Ni: 0.91%, Ti: 0.020%, Nb: 0.025%, B: 0.0016%, and the rest are Fe and unavoidable impurities.

[0031] The manufacturing method of the above-mentioned steel plate comprises the following steps: hot metal desulfurization pretreatment-converter smelting-LF+RH refining-continuous casting-slab slow cooling-slab heating-phosphorus removal-rolling-air cooling-flaw detection-shot blasting-quenching-back Fire-straightening-cutting-sampling-printing logo-inspection-warehousing,

[0032]The molten steel smelted according to the ratio is vacuum degassed and then continuously cast. The thickness of the continuous casting slab is 320mm. The steel slab is heated to a furnace temperature of 1180°C and kept for 350 minutes. Rolling, in which the rolling in the recrystallization...

Embodiment 2

[0034] A kind of ultra-high steel Q960E thick plate provided in this embodiment, its chemical composition and mass percentage are as follows: C: 0.17%, Si: 0.28%, Mn: 1.24%, P≤0.008%, S≤0.002%, Cr: 0.43 %, Mo: 0.48%, Ni: 0.95%, Ti: 0.016%, Nb: 0.027%, B: 0.0017%, and the rest are Fe and unavoidable impurities.

[0035] The molten steel smelted according to the ratio is vacuum degassed and then continuously cast. The thickness of the continuous casting slab is 320mm. The steel slab is heated to a furnace temperature of 1200°C and kept for 345 minutes. Rolling, in which the rolling in the recrystallization area requires a pass reduction rate of more than 12%, the final rolling temperature in the recrystallization area is 1035°C, the rolling in the non-recrystallization area requires a cumulative reduction rate of more than 40%, and the starting rolling temperature is 930°C. ℃, the final rolling temperature is 900 ℃, the final rolling thickness of the steel plate is 90mm, air-coo...

Embodiment 3

[0037] A kind of ultra-high steel Q960E thick plate provided in this embodiment, its chemical composition and mass percentage are as follows: C: 0.16%, Si: 0.25%, Mn: 1.10%, P≤0.008%, S≤0.0015%, Cr: 0.44 %, Mo: 0.50%, Ni: 0.92%, Ti: 0.015%, Nb: 0.026%, B: 0.0016%, and the rest are Fe and unavoidable impurities.

[0038] The molten steel smelted according to the ratio is vacuum degassed and then continuously cast. The thickness of the continuous casting slab is 320mm. The steel slab is heated to a furnace temperature of 1220°C and kept for 345 minutes. Rolling, in which the rolling in the recrystallization area requires a pass reduction rate of more than 12%, the final rolling temperature in the recrystallization area is 1040°C, the rolling in the non-recrystallization area requires a cumulative reduction rate of more than 40%, and the starting rolling temperature is 915°C. ℃, the final rolling temperature is 890 ℃, the final rolling thickness of the steel plate is 90mm, air-co...

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Abstract

The invention discloses an ultrahigh steel Q960E thick plate, and relates to the field of ultrahigh-strength steel thick plate producing and manufacturing. The ultrahigh steel Q960E thick plate comprises chemical components including, by mass percent, 0.15%-0.18% of C, 0.20%-0.50% of Si, 0.80%-1.30% of Mn, smaller than or equal to 0.010% of P, smaller than or equal to 0.003% of S, 0.30%-0.50% of Cr, 0.40%-0.60% of Mo, 0.80%-1.0% of Ni, 0.008%-0.030% of Ti, 0.015%-0.050% of Nb, 0.0008%-0.0025% of B and the balance Fe and inevitable impurities. The medium-high carbon and alloying component design is adopted, controlled rolling and offline heat treatment methods are adopted for assistance, and the ultrahigh-strength steel thick plate with the thickness being 90 mm is provided.

Description

technical field [0001] The invention relates to the field of production and manufacture of ultra-high-strength steel thick plates, in particular to an ultra-high-strength steel Q960E thick plate and a manufacturing method. Background technique [0002] Ultra-high-strength steel is a resource-saving and high-tech and high-value-added product. With the vigorous development of domestic large-scale projects, high-strength steel of Q890D and above grades is widely used in construction machinery, mining, and hoisting mines. Vehicles, offshore platforms, etc. have been vigorously applied. Its characteristics are: simple structure, light weight, high safety, capable of carrying large dynamic and static loads, and long service time; however, due to the thickness of domestic billets, Large-thickness structural parts can only be replaced by conventional Q345-Q6900 series low-alloy structural steels. Due to their low strength, such structural steels are not strong enough to be used unde...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/44C22C38/48C22C38/50C22C38/54C21D8/02C21D1/18
CPCC21D1/18C21D8/0226C22C38/002C22C38/02C22C38/04C22C38/44C22C38/48C22C38/50C22C38/54
Inventor 姜在伟王升侯中华闫强军张仪杰姜辉
Owner NANJING IRON & STEEL CO LTD
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