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1300MPa-grade hot continuous rolling ultrahigh-strength steel plate and manufacturing method thereof

A manufacturing method and hot continuous rolling technology, applied in manufacturing tools, heat treatment process control, heat treatment equipment and other directions, can solve the problems of high cost, large amount of alloy addition, long process flow, etc.

Active Publication Date: 2021-08-06
MAANSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On January 12, 2018, the publication number is CN107574370 B. The patent of NM400 wear-resistant steel with a thickness of 2-10 mm and its production method is designed with Cr, Ni, Nb, Ti, and B microalloying components. The amount of alloy added is large and the cost is high. Moreover, the overall process adopts the design idea of ​​direct quenching and online heat treatment (tempering), and the process is long.

Method used

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  • 1300MPa-grade hot continuous rolling ultrahigh-strength steel plate and manufacturing method thereof
  • 1300MPa-grade hot continuous rolling ultrahigh-strength steel plate and manufacturing method thereof
  • 1300MPa-grade hot continuous rolling ultrahigh-strength steel plate and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] A 1300MPa grade hot-rolled ultra-high-strength steel plate specifically includes the following chemical components in mass percentages:

[0059]C:0.17%;Si:1.15%;Mn:1.77%;P:0.010%;S:0.002%;Nb:0.028%,Ti:0.020%;Als:0.39%;B:0.0012%;H:0.00014%; N: 0.0025%; O: 0.0019%; the rest is Fe and inevitable inclusions.

[0060] The manufacturing method of the above-mentioned 1300MPa grade hot-rolled ultra-high-strength steel plate comprises the following steps:

[0061] 1) Hot metal pretreatment, converter smelting, alloy fine-tuning station, LF refining, RH refining: hot metal pretreatment requires pre-slagging and post-slagging, after hot metal desulfurization [S] = 0.0049%; refining adopts LF+RH dual process Control according to the chemical composition in the above formula, RH refining control deep degassing time is 15min and molten steel H content = 0.00014%;

[0062] 2) Continuous casting and heating: continuous casting adopts full protection pouring, adopts special medium-car...

Embodiment 2

[0068] A 1300MPa grade hot-rolled ultra-high-strength steel plate, including the following chemical components in mass percentage: C: 0.16%; Si: 1.01%; Mn: 1.81%; P: 0.008%; S: 0.001%; ​​Nb: 0.020%, Ti: 0.035%; Als: 0.45%; B: 0.0013%; H: 0.00012%; N: 0.0020%; O: 0.0016%; the rest is Fe and inevitable inclusions.

[0069] The manufacturing method of the above-mentioned 1300MPa grade hot rolling ultra-high-strength steel plate, the technological process is: molten iron pretreatment, converter smelting, alloy fine-tuning station, LF refining, RH refining, continuous casting, heating, rolling, direct quenching, coiling, leveling, Kaiping process, specifically:

[0070] 1) Hot metal pretreatment, converter smelting, alloy fine-tuning station, LF refining, RH refining: hot metal pretreatment requires pre-slagging and post-slagging, after hot metal desulfurization [S] = 0.0047%; refining adopts LF+RH dual process Control according to the chemical composition of the above formula, RH...

Embodiment 3

[0077] A 1300MPa grade hot-rolled ultra-high-strength steel plate, including the following chemical components in mass percentage: C: 0.18%; Si: 0.89%; Mn: 1.90%; P: 0.007%; S: 0.002%; Nb: 0.030%, Ti: 0.031%; Als: 0.40%; B: 0.0015%; H: 0.00013%; N: 0.0010%; O: 0.0019%; the rest is Fe and inevitable inclusions.

[0078] The manufacturing method of the above-mentioned 1300MPa grade hot rolling ultra-high-strength steel plate, the technological process is: molten iron pretreatment, converter smelting, alloy fine-tuning station, LF refining, RH refining, continuous casting, heating, rolling, direct quenching, coiling, leveling, Kaiping process, specifically:

[0079] 1) Hot metal pretreatment, converter smelting, alloy fine-tuning station, LF refining, RH refining: hot metal pretreatment requires pre-slagging and post-slagging, and [S]=0.0045% after hot metal desulfurization; refining adopts LF+RH dual process Control according to the chemical composition of the above formula, th...

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Abstract

The invention provides a 1300MPa-grade hot continuous rolling ultrahigh-strength steel plate and a manufacturing method thereof. The 1300MPa-grade hot continuous rolling ultrahigh-strength steel plate comprises the following components: 0.15-0.30% of C, 0.20-1.20% of Si, 1.5-2.5% of Mn, less than or equal to 0.015% of P, less than or equal to 0.008% of S, 0.020-0.050% of Nb, 0.020-0.050% of Ti, 0.10-0.50% of Als, 0.0010-0.0020% of B, less than or equal to 0.00015% of H, less than or equal to 0.0030% of N, less than or equal to 0.0030% of O and the balance of Fe and inevitable impurities. By adopting a TMCP and direct quenching process technology, a quenching and tempering or tempering heat treatment process is not needed, industrial production of the 1300MPa-grade hot continuous rolling ultrahigh-strength steel plate is achieved on a hot continuous rolling strip production line, and the 1300MPa-grade hot continuous rolling ultrahigh-strength steel plate has the characteristics of being short in process flow, low in production cost, high in product strength and hardness, good in wear resistance, good in cold bending forming property, good in plate shape and the like.

Description

technical field [0001] The invention relates to the technical field of advanced high-strength steel production technology, in particular to a 1300MPa grade hot-rolled ultra-high-strength steel plate and a manufacturing method thereof. Background technique [0002] As one of the most direct and effective means of lightweighting, high-strength steel is widely used in mining, metallurgy, electric power, construction machinery and other fields. The strength level of hot-rolled high-strength steel produced in batches at home and abroad is mainly concentrated below 1000MPa. As the country advocates low-carbon emissions, energy saving and emission reduction, green environmental protection and other policies, and the development trend of lightweight construction machinery and equipment is becoming more and more urgent, 1000MPa and above The demand for hot-rolled ultra-high-strength steel plates of strength grades is increasing day by day. [0003] At present, ultra-high-strength st...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/12C22C38/14C22C38/06C22C33/04C21D8/02C21D1/18C21D11/00C21D6/00
CPCC22C38/02C22C38/04C22C38/12C22C38/14C22C38/06C22C33/04C22C38/002C21D8/0205C21D8/0226C21D8/0247C21D1/18C21D11/005C21D6/008C21D6/005C21D2211/008C21D2211/005
Inventor 胡学文彭欢朱涛张建王海波舒宏富闻成才张宇光崔宇轩王承剑吴志文何博
Owner MAANSHAN IRON & STEEL CO LTD
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