Low-cost non-quenched and tempered high-strength wear-resistant steal plate with yield strength of 780 MPa grade and manufacturing method thereof

A yield strength, low-cost technology, applied in the field of hot-rolled high-strength steel production, can solve the problems of complex process, high manufacturing cost, and many alloys, and achieve the effects of significantly reducing costs, reducing yield ratio, and improving strength

Inactive Publication Date: 2011-01-26
SHANDONG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The steel is a heat-treated plate with complex process, Ni, Mo, etc.

Method used

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  • Low-cost non-quenched and tempered high-strength wear-resistant steal plate with yield strength of 780 MPa grade and manufacturing method thereof
  • Low-cost non-quenched and tempered high-strength wear-resistant steal plate with yield strength of 780 MPa grade and manufacturing method thereof
  • Low-cost non-quenched and tempered high-strength wear-resistant steal plate with yield strength of 780 MPa grade and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example

[0027]Example 1: The chemical composition of selected high-strength steel, the weight percentage is: C: 0.1%, Si: 0.30%, Mn: 1.80%, Nb: 0.05%; Ti: 0.15%; Cr: 0.6%; P: 0.008%; S: 0.006%; the rest is iron Fe and unavoidable impurities. The above-mentioned prepared raw materials were smelted on a 120-ton converter, and continuously cast into a continuous casting slab of 160mm×1230mm×11800mm, the continuous casting slab was heated to 1230°C for 150 minutes, and rolled on a hot continuous rolling mill. The rolling start temperature is controlled at 1150°C, the rough rolling finish rolling temperature is controlled at 1050°C, the rough rolling is carried out for 5 passes, the intermediate billet thickness is 31mm, the finish rolling start rolling temperature is controlled at 1020°C, and the finish rolling finish rolling temperature is controlled at 880°C , 6 passes of finish rolling, the average reduction of each pass of finish rolling is controlled at 25%, and water cooling is used...

Example

[0030] Example 2: The chemical composition of selected high-strength steel, the weight percentage is: C: 0.12%, Si: 0.2%, Mn: 1.7%, Nb: 0.04%; Ti: 0.15%; Cr: 0.8%; P: 0.008%; S: 0.003%; the rest is iron Fe and unavoidable impurities.

[0031] The above-mentioned prepared raw materials were smelted on a 120-ton converter, and continuously cast into a continuous casting slab of 160mm×1230mm×11800mm, the continuous casting slab was heated to 1230°C for 145 minutes, and the rough rolling start temperature was controlled at 1180°C , the rough rolling finish rolling temperature is controlled at 1050°C, the rough rolling is carried out for 5 passes, and the thickness of the intermediate billet is 40mm. After that, the intermediate billet is finished rolling, the finish rolling start temperature is controlled at 1020°C, and the finish rolling finish rolling temperature is controlled at 900°C. 5 passes of finish rolling, the average reduction of each pass of finish rolling is controlle...

Example

[0034] Example 3: The chemical composition of selected high-strength steel, the weight percentage is: C: 0.10%, Si: 0.3%, Mn: 1.8%, Nb: 0.05%; Ti: 0.12%; Cr: 0.9%; P: 0.008%; S: 0.003%; the rest is iron Fe and unavoidable impurities.

[0035] The above-mentioned prepared raw materials were smelted on a 120-ton converter, and continuously cast into a continuous casting slab of 160mm×1230mm×11800mm, the continuous casting slab was heated to 1220°C for 150 minutes, and the rough rolling start temperature was controlled at 1160°C , the rough rolling finish rolling temperature is controlled at 1030°C, the rough rolling is 5 passes, the middle billet thickness is 41mm, after that, the middle billet is finished rolling, the finish rolling start temperature is controlled at 1000°C, the finish rolling finish rolling temperature is controlled at 890°C, 5 passes of finish rolling, the average reduction of each pass of finish rolling is controlled at 23%, and water cooling is adopted betw...

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Abstract

The invention discloses a low-cost non-quenched and tempered high-strength wear-resistant steal plate with a yield strength of 780 MPa grade, which comprises the following chemical components in percentage by weight: 0.08 to 0.13 percent of C, less than or equal to 0.5 percent of Si, 1.6 to 1.9 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.01 percent of S, 0.6 to 1.0 percent of Cr, 0.1 to 0.15 percent of Ti, 0.02 to 0.06 percent of Nb, less than or equal to 0.005 percent of N, less than or equal to 0.002 percent of O, and the balance of iron (Fe) and inevitable impurities. A manufacturing method of wear-resistant steel comprises the steps of electric furnace or converter smelting, refining, continuous casting, continuous casting bloom heating, hot continuous rolling, laminar flow cooling, coiling, decoiling and cutting to obtain a finished plate. A high-strength steel strip of the invention can achieve the following combination properties that: the ReL is 780 to 840 MPa, the Rm is 850 to 930 MPa, delta is more than or equal to 16 percent, the high-strength steel strip meets high wear resistance, and compared with Q345B, the wear resistance is improved by more than 2 times.

Description

technical field [0001] The invention relates to a method for manufacturing a low-cost non-quenched and tempered high-strength wear-resistant steel plate with a yield strength of 780 MPa, and belongs to the technical field of hot-rolled high-strength steel production. Background technique [0002] At present, among the steel used in construction machinery, high-strength steel accounts for a certain proportion, mainly used in the manufacture of crane cantilever, forklift front baffle and other parts, and the use requirements and conditions are very strict. There are many cases where it cannot withstand long-term use due to severe local wear. The main requirements for the use of this type of construction machinery steel are wear resistance, so the requirements for the manufacturing materials are both high strength and certain wear resistance. [0003] In this regard, many patents involve the manufacture of high-strength wear-resistant steel plates, and there are differences in...

Claims

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Application Information

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IPC IPC(8): C22C38/38C22C33/04C21D8/02
Inventor 赵培林孙新军刘洪成王学新张桂南周平张佩王建景路峰王金秀张明金刘莱萌亓伟伟王奉县
Owner SHANDONG IRON & STEEL CO LTD
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