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Anti-bullet steel with ultrahigh-strength being 1760 MPa and manufacturing method thereof

A 1760mpa, manufacturing method technology, applied in the field of iron and steel smelting, can solve the problems of large equipment space, manpower, increased time cost, time-consuming, etc., and achieve the effect of excellent strength and toughness matching, and excellent low-temperature impact toughness

Inactive Publication Date: 2017-05-31
SHANDONG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The above-mentioned steel plates are forged and rolled coils, and the second step is stamping and forming. Using this process to manufacture ultra-high-strength bulletproof steel plates requires investment in equipment, large sites, and manpower, which will inevitably increase costs. In addition, the process is relatively Time-consuming, will increase time cost
[0011] In addition, the thickness of the steel plate targeted by the above process is less than 6mm. If it is aimed at a steel plate thicker than 6mm, it is not applicable.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The slab smelting composition is:

[0033] C: 0.28%; Si: 0.45%; Mn: 0.63%; P: 0.013%; S: 0.002%; Cr: 0.97%; Ni: 0.55%; Mo: 0.25%; Cr+Ni+Mo: 1.77%, the rest is Fe and unavoidable impurities.

[0034] The manufacture method of 1760MPa ultra-high-strength ballistic steel of the present invention specifically comprises the following steps:

[0035] KR hot metal pretreatment→converter smelting→deoxidation alloying→CAS stirring→LF refining→RH vacuum degassing secondary refining→CCM slab continuous casting→cutting and sizing inspection→slab stacking and slow cooling for 48 hours→ Slab heating→high pressure water descaling→rough rolling→finish rolling→straightening→shot blasting→quenching→tempering→straightening→cutting, sampling→inspection→finished product.

[0036] The main process parameters are as follows:

[0037] (1) KR hot metal pretreatment: S content control is less than 0.002%;

[0038] (2) Converter smelting: BOF oxygen and argon top and bottom blowing off C, usi...

Embodiment 2

[0057] The slab smelting composition is:

[0058] C: 0.31%, Si: 0.48%, Mn: 0.66%, P: 0.015%, S: 0.001%, Cr: 0.99%; Ni: 0.38%; Mo: 0.30%; B: 0.0018%; Ti: 0.030%, Cr+Ni+Mo: 1.67%, the rest is Fe and unavoidable impurities.

[0059] The smelting steps are the same as in Example 1, but the specific process parameters are different, slab soaking temperature (°C): 1200; soaking time (hours): 4.0; rough rolling temperature (°C): 1050; finish rolling start temperature (°C): 1000; finishing rolling temperature (°C): 850; high-pressure water spraying times (times): 2; quenching heating temperature (°C): 900; cooling rate (°C / s): 33; tempering temperature (°C): 220, tempering time (minutes): 200;

[0060] Steel plate properties:

[0061] Specifications: steel plate thickness 12mm; yield strength (MPa): 1420; tensile strength (MPa): 1770; elongation after fracture (%): 9; V-shaped transverse impact energy (-40°C): 27J, 29J, 28J ( Sample size 10*10*55mm); surface Brinell hardness (HBW)...

Embodiment 3

[0063] The slab smelting composition is:

[0064] C: 0.34%, Si: 0.50%, Mn: 0.71%, P: 0.015%, S: 0.001%, Cr: 1.04%; Ni: 0.40%; Mo: 0.27%; B: 0.0015%; Ti: 0.022%, Cr+Ni+Mo: 1.71%, the rest is Fe and unavoidable impurities.

[0065] Slab soaking temperature (°C): 1190; soaking time (hours): 4.2; rough rolling temperature (°C): 1040; finish rolling start temperature (°C): 990; finish rolling finish temperature (°C): 851 ; High-pressure water spraying times (times): 3; Quenching heating temperature (°C): 896; Cooling rate (°C / s): 33; Tempering temperature (°C): 200, Tempering time (minutes): 190;

[0066] Steel plate properties:

[0067] Specifications: steel plate thickness 25mm; yield strength (MPa): 1320; tensile strength (MPa): 1786; elongation after fracture (%): 10; V-shaped transverse impact energy (-40°C): 31J, 36J, 35J ( Sample size 10*10*55mm); surface Brinell hardness (HBW): 495; steel plate surface remanence (GS): 10.

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Abstract

The invention discloses a manufacturing method for ultrahigh-strength alloy steel with the tensile strength being more than 1760 MPa or applied to protection. The method comprises the following main steps of KR molten iron pre-treatment, converter smelting, refining outside an LF converter, RH vacuum degassing secondary refining outside the converter, plate blank continuous casting, plate blank reheating, rough rolling through a roughing mill, finish rolling through a finishing mill and quenching and tempering test. By adoption of the manufacturing method for poduction, an obtained ultrahigh-strength alloy steel plate with the thickness being 6-25 mm achieves excellent high-toughness matching and good low-temperature impact toughness at the temperature being minus 40 DEG C. By controlling rolling, quenching and tempering heat treatment, the metallurgical structure is mainly a tempered martensite, the tensile strength is equal to or more than 1760 MPa, the yield strength is equal to or more than 1270 MPa, the transverse low-temperature impact work at the temperature being minus 40 DEG C is equal to or more than 20 J, and the surface Brinell hardness is equal to or more than 490 HBW.

Description

technical field [0001] The invention belongs to the technical field of iron and steel smelting, and in particular relates to a method for manufacturing ultra-high-strength alloy steel with a tensile strength greater than 1760 MPa for anti-ballistic or protective applications. Background technique [0002] In recent years, 1760MPa ultra-high-strength bullet-resistant steel has been used more and more in the manufacture of many civilian cash transport vehicles, bank warehouse doors, military personnel carriers, police armor and army armored vehicles and other national defense engineering equipment. In the past, most of them were made of imported materials, or domestically produced Q690 grade steel plates. The yield strength was only about 690MPa, and the tensile strength was in the range of 780-950MPa. The strength was far from meeting the requirements of ultra-high-strength bullet-resistant steel. The steel plate is required to have low surface remanence. Therefore, it is ur...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/44C22C38/50C22C38/54C21D1/18C21D8/02
CPCC22C38/02C21D1/18C21D8/0226C21D2211/008C22C38/04C22C38/44C22C38/50C22C38/54
Inventor 冯勇孙德民周兰聚侯登义贾希光
Owner SHANDONG IRON & STEEL CO LTD
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