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1400 MPa super-high strength alloy steel and manufacturing method thereof

A manufacturing method and alloy steel technology, applied in the field of smelting, can solve problems such as low remanence value, and achieve the effects of low remanence value, excellent low temperature impact toughness and easy welding

Inactive Publication Date: 2015-11-11
SHANDONG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The high-strength plate Q960 produced by the above method has a yield strength above 960Mpa and cannot meet the requirements of higher strength. Therefore, it is necessary to improve the existing steel plate rolling process to produce a steel plate with higher strength and good low-temperature impact toughness. , easy to weld, low remanence value, high hardness 1400MPa ultra-high strength alloy steel plate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The slab smelting composition is:

[0033] C: 0.18%; Si: 0.45%; Mn: 1.30%; P: 0.008%; S: 0.002%; Cr+Ni+Mo: 1.25%, the rest is Fe and unavoidable impurities.

[0034] Slab soaking temperature (°C): 1180; soaking time (hours): 3.9; rough rolling temperature (°C): 1030; finish rolling start temperature (°C): 980; finish rolling finish temperature (°C): 840 ; High-pressure water spraying times (times): 3; Quenching heating temperature (°C): 900; Cooling rate (°C / s): 32; Tempering temperature (°C): 255, Tempering time (minutes): 185;

[0035] The detailed steps are as follows:

[0036] (1) KR hot metal pretreatment: S content control is less than 0.002%;

[0037] (2) Converter smelting: BOF oxygen and argon top and bottom blowing off C, using hydraulic slide to stop slag;

[0038] (3) Refining outside the LF furnace: the heating time is about 16 minutes;

[0039] (4) RH vacuum degassing: process for 20 minutes at a vacuum degree of less than 200Pa, and softly blow with ...

Embodiment 2

[0048] The slab smelting composition is:

[0049] C: 0.20%, Si: 0.48%, Mn: 1.35%, P: 0.005%, S: 0.001%, Cr: 0.60%; Ni: 0.30%; Mo: 0.30%; B: 0.0018%; Ti: 0.030%, Cr+Ni+Mo: 1.20%, the rest is Fe and unavoidable impurities.

[0050] Slab soaking temperature (°C): 1200; soaking time (hours): 4.0; rough rolling temperature (°C): 1050; finish rolling start temperature (°C): 1000; finish rolling finish temperature (°C): 850 ; High-pressure water spraying times (times): 2; Quenching heating temperature (°C): 895; Cooling rate (°C / s): 35; Tempering temperature (°C): 280, Tempering time (minutes): 200

[0051] The specific steps are as follows:

[0052] (1) KR hot metal pretreatment: S content control is less than 0.002%;

[0053] (2) Converter smelting: BOF oxygen and argon top and bottom blowing off C, using hydraulic slide to stop slag;

[0054] (3) Refining outside the LF furnace: the heating time is about 15 minutes;

[0055] (4) RH vacuum degassing: treatment at a vacuum degr...

Embodiment 3

[0064] The slab smelting composition is:

[0065] C: 0.19%, Si: 0.50%, Mn: 1.40%, P: 0.007%, S: 0.001%, Cr: 0.55%; Ni: 0.45%; Mo: 0.29%; B: 0.0015%; Ti: 0.022%, Cr+Ni+Mo: 1.29%, the rest is Fe and unavoidable impurities.

[0066] Slab soaking temperature (°C): 1190; soaking time (hours): 3.9; rough rolling temperature (°C): 1035; finish rolling start temperature (°C): 995; finish rolling finish temperature (°C): 843 ; High-pressure water spraying times (times): 3; Quenching heating temperature (°C): 896; Cooling rate (°C / s): 33; Tempering temperature (°C): 260, Tempering time (minutes): 190;

[0067] The specific steps are as follows:

[0068] (1) KR hot metal pretreatment: S content control is less than 0.002%;

[0069] (2) Converter smelting: BOF oxygen and argon top and bottom blowing off C, using hydraulic slide to stop slag;

[0070] (3) Refining outside the LF furnace: the heating time is about 18 minutes;

[0071] (4) RH vacuum degassing: treatment at a vacuum degr...

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Abstract

The invention belongs to the technical field of smelting and particularly relates to 1400 MPa super-high strength alloy steel and a manufacturing method thereof. The 1400 MPa super-high strength alloy steel is characterized by comprising 0.18-0.25% of C, 0.40-0.65% of Si, 1.10-1.40% of Mn, not greater than 0.009% of P, not greater than 0.002% of S, 0.30-0.80% of Cr, 0.20-0.60% of Ni, 0.20-0.60% of Mo, 0.008-0.0025% of B, 0.020-0.035% of Ti and balance Fe and inevitable impurities. The 6-60 mm super-high strength alloy steel plates produced through the method is great in strength and toughness matching and good in impact toughness at the low temperature of -40 DEG C. By controlling rolling, quenching and temper heat treatment, the metallographic phase mainly is tempered martensite organizations, the strength of extension is higher than 1400 Mpa, the yield strength is higher than 1170 Mpa, the transverse low temperature ballistic work at -40 DEG C is larger than 50 J, the surface brinell hardness is larger than 430 HBW, and the surface residual magnetization is less than 15 GS.

Description

technical field [0001] The invention belongs to the technical field of smelting, and in particular relates to a 1400MPa grade ultra-high-strength alloy steel and a manufacturing method thereof. Background technique [0002] In recent years, more and more 1400MPa-grade ultra-high-strength alloy steel plates have been used in the manufacture of many large-scale national defense engineering equipment. In the past, most of them used Q960-grade steel plates that meet GB / T16270. The yield strength is greater than 960MPa, and the tensile strength is between 980- In the range of 1150MPa, the strength is far from meeting the requirements of ultra-high strength, and the steel plate is required to have low surface remanence and high wear resistance during manufacturing and use. Therefore, it is urgent to develop a 1400MPa class ultra-high-strength alloy steel plate with higher strength, good low-temperature impact toughness, easy welding, low remanence value, and high hardness. [0...

Claims

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Application Information

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IPC IPC(8): C22C38/54C21D8/02
Inventor 孙德民冯勇刘晓东侯登义贾希光谢晖张海民薛艳龙王南辉曹运涛
Owner SHANDONG IRON & STEEL CO LTD
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