Ultrahigh tough steel with tensile strength of 1100 Mpa and manufacturing method thereof
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A technology of tensile strength and ultra-high toughness, applied in the field of ultra-high-strength steel, can solve problems such as low-temperature impact work difference, high dislocation density, and fracture failure, and achieve good strength, good low-temperature impact toughness, and tensile properties. The effect of reducing production costs and carbon emissions
Inactive Publication Date: 2019-01-04
BAOSHAN IRON & STEEL CO LTD
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Problems solved by technology
High-strength steel mainly composed of martensite, due to the strain storage energy reaching 1000J / mol, the dislocation density is high, resulting in poor low-temperature impact energy
There are high-density dislocations and sub-grain boundaries inside the martensitic high-strength steel, and it will break and fail rapidly when tiny defects such as microcracks appear during the stretching process, and the elongation is low
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Embodiment 1
[0055] Smelt in electric furnace or converter according to the chemical composition shown in Table 1, and cast into continuous casting slab or steel ingot, heat the continuous casting slab or steel ingot to 1050°C, finish rolling temperature at 800°C, intermediate billet size 220*220mm. The intermediate billet is heated to 1070°C, the final rolling temperature is 760°C, and the specification of the finished bar is Cool in air after rolling. The quenching heating temperature is 840°C, and the heating time is 30 minutes; the tempering temperature is 500°C, and the tempering time is 30 minutes, and air-cooled after tempering.
Embodiment 2
[0057] The implementation method is the same as that in Example 1, wherein the heating temperature is 1080°C, the finish rolling temperature is 840°C, and the size of the intermediate billet is 215*215mm. The intermediate billet is heated to 1100°C, the final rolling temperature is 830°C, and the specification of the finished bar is Cool in air after rolling. The quenching heating temperature is 870°C, the heating time is 100 minutes, the tempering temperature is 530°C, the tempering time is 60 minutes, and air cooling after tempering.
Embodiment 3
[0059] The implementation is the same as in Example 1, wherein the heating temperature is 1120°C, the finish rolling temperature is 920°C, and the finished bar specification is Cool in air after rolling. The quenching heating temperature is 900°C, the heating time is 150 minutes, the tempering temperature is 550°C, the tempering time is 100 minutes, and air-cooled after tempering.
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Abstract
The invention discloses ultrahigh tough steel with tensile strength of 1100 Mpa and a manufacturing method thereof. Chemical components of the tough steel comprises, by weight, 0.245-0.350% of C, 0.10-0.50% of Si, 0.20-1.20% of Mn, P less than or equal to 0.015%, S less than or equal to 0.003%, 0.30-1.20% of Cr, 0.20-0.80% of Mo, 2.00-3.70% of Ni, 0-0.30% of Cu, 0-0.08% of Nb, 0-0.12% of V, 0.01-0.08% of Al, 0.003-0.06% of Ti, Ca less than or equal to 0.005%, H less than or equal to 0.002%, N less than or equal to 0.0120%, O less than or equal to 0.0030%, Fe and inevitable impurities. The preparation method adopts quenching plus tempering heat treatment, and tempered martensites plus tempered bainites and residual austenite tissue are obtained. The yield strength of steel is greater than or equal to 900 Mpa, the tensile strength is greater than or equal to 1100 Mpa, the charpy impact energy Akv (-20 DEG C) is greater than or equal to 70 J, the elongation rate is greater than or equal to 15%, the shrinkage rate of a fracture surface is greater than or equal to 50%, good strength, low-temperature toughness and plasticity are achieved, and the ultrahigh tough steel can be used for manufacturing high-performance ocean platform mooring cables of R6 grade and the like.
Description
technical field [0001] The invention relates to an ultra-high-strength steel material with good low-temperature toughness, in particular to an ultra-high-strength tough steel with a tensile strength of 1100 MPa and a manufacturing method thereof. Background technique [0002] High-strength and tough steel bars are used in the production of mooring chains on offshore platforms and high-safety mechanical and structural components. With the development of marine resources in the deep sea, the scale of the offshore platform, the complexity of the structure and function, the requirements for the mooring chain of the offshore platform are also increasing. Offshore platform mooring chains are used in harsh environments and are subjected to high tensile loads, seawater impacts during wave motion, seawater erosion and microbial corrosion. The steel used for mooring chains on offshore platforms mainly includes R3, R3S, R4, R4S, R5, etc. The corresponding tensile strengths are 690MPa...
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