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High-strength steel sheet with yield strength of 1100MPa and manufacturing method thereof

A high-strength steel plate and yield strength technology, applied in the field of ultra-high-strength steel plates, can solve the problems of low-temperature impact energy of high-strength steel plates, and achieve ultra-high strength, good toughness, and loose process window effects

Active Publication Date: 2012-10-24
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The larger defect density is the source of micro-cracks, which can form micro-cracks under the action of force. The growth of micro-cracks makes the steel plate break rapidly along the grain boundary. Therefore, the low-temperature impact of high-strength steel plates with martensitic structure low power

Method used

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  • High-strength steel sheet with yield strength of 1100MPa and manufacturing method thereof
  • High-strength steel sheet with yield strength of 1100MPa and manufacturing method thereof
  • High-strength steel sheet with yield strength of 1100MPa and manufacturing method thereof

Examples

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Effect test

Embodiment 1

[0070] The chemical composition shown in Table 2 is smelted by electric furnace or converter, and cast into continuous casting billets or ingots. The continuous casting billets or ingots are heated to 1050 °C, the rolling temperature is 1020 °C, and the pass deformation rate is 5 to 30%. The finish rolling temperature is 860°C, and the thickness of the finished steel sheet is 8mm. Air-cooled after rolling. The quenching heating temperature is 850°C. The tempering temperature is 350°C.

Embodiment 2

[0072] The implementation is the same as in Example 1, wherein the heating temperature is 1080°C, the rolling temperature is 1060°C, the pass deformation rate is 5-30%, the final rolling temperature is 870°C, and the thickness of the finished steel plate is 10 mm. Air-cooled after rolling. The quenching heating temperature is 880°C. The tempering temperature is 320°C.

Embodiment 3

[0074] The implementation is the same as in Example 1, wherein the heating temperature is 1110°C, the rolling temperature is 1100°C, the pass deformation rate is 5-30%, the final rolling temperature is 930°C, and the thickness of the finished steel plate is 12 mm. Air-cooled after rolling. The quenching heating temperature is 900°C. The tempering temperature is 280°C.

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Abstract

A high-strength steel sheet with yield strength of 1100MPa and a manufacturing method thereof. The high-strength steel sheet comprises, based on the weight percentage, 0.15-0.25% of C, 0.10-0.50% of Si, 0.60-1.20% of Mn, no more than 0.013% of P, no more than 0.003% of S, 0.20-0.55% of Cr, 0.20-0.70% of Mo, 0.60-2% of Ni, 0-0.07% of Nb, 0-0.07% of V, 0.0006-0.0025% of B, 0.01-0.08% of Al, 0.003-0.06% of Ti, no more than 0.00018% of H, no more than 0.0040% of N, no more than 0.0030% of O, and the balance of Fe and inevitable impurities; and the carbon equivalent CEQ is no more than 0.60%. A quenching and a tempering heat treatment are employed to obtain a tempered martensite tissue. The steel provided by the present invention has yield strength no less than 1100MPa, tensile strength no less than 1250MPa, Charpy ballistic work Akv (-40 DEG C) no less than 50J, and good strength and toughness.

Description

technical field [0001] The invention relates to an ultra-high-strength steel plate with good low-temperature toughness, in particular to a high-strength steel plate with a yield strength of 1100 MPa and a manufacturing method thereof. Background technique [0002] High-strength steel plates are used in coal mining machinery such as coal mine hydraulic supports, construction machinery such as crawler cranes, construction cranes and concrete pump trucks, and marine large floating cranes. Mechanical structures usually serve in large loads and complex environments, so high-strength steel plates for mechanical structures require high strength and good low-temperature toughness. At present, the high-strength steel plates involved in the European standard EN10025 and the national standard 16270 have a maximum yield strength of 960MPa. At present, super-large construction machinery, such as large-tonnage crawler cranes and construction cranes, all need to use steel plates with a yi...

Claims

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Application Information

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IPC IPC(8): C22C38/54C21D8/02C21D1/18
Inventor 赵四新姜洪生姚连登
Owner BAOSHAN IRON & STEEL CO LTD
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