Low-cost high-strength non-quenched and tempered steel plate with yield strength of 690 MPa and manufacturing method thereof

A yield strength, low-cost technology, applied in the direction of temperature control, metal rolling, elongation control, etc., can solve the problems of complex production process, many types of alloy elements, and high manufacturing cost, so as to simplify the production process and reduce the cost of alloy , The effect of reducing manufacturing costs

Pending Publication Date: 2021-09-24
BAOSTEEL ZHANJIANG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The above two disclosed patents, from the perspective of production process and alloy composition design, have many types of alloy elements, high content, complex production process, and high manufacturing cost.

Method used

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  • Low-cost high-strength non-quenched and tempered steel plate with yield strength of 690 MPa and manufacturing method thereof
  • Low-cost high-strength non-quenched and tempered steel plate with yield strength of 690 MPa and manufacturing method thereof
  • Low-cost high-strength non-quenched and tempered steel plate with yield strength of 690 MPa and manufacturing method thereof

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Embodiment Construction

[0019] A low-cost high-strength non-quenched and tempered steel plate with a yield strength of 690MPa in the present invention, the weight percentage of its chemical composition is: C: 0.06-0.09%; Si: 0.1-0.5%; Mn: 1.3-2.0%; P≤0.015%; S ≤0.002%; Nb: 0.03-0.06%; Ti: 0.01-0.02%; Al: 0.025-0.045%; B: 0.001-0.0016%; the rest are Fe and unavoidable impurities.

[0020] The yield strength of the steel plate is ≥690MPa, the tensile strength is 770MPa, the elongation after fracture is ≥14%, and the longitudinal and transverse impact energy at -20°C is ≥47J.

[0021] The manufacturing method of the above-mentioned low-cost high-strength non-quenched and tempered steel plate with a yield strength of 690 MPa comprises the following steps:

[0022] (1) Smelting and casting: smelting is carried out according to the chemical composition and proportion of the low-cost high-strength non-quenched and tempered steel plate with a yield strength of 690MPa. After the steel is tapped from the conve...

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Abstract

The invention discloses a low-cost high-strength non-quenched and tempered steel plate with the yield strength of 690 MPa and a manufacturing method thereof. The steel plate comprises the following chemical components in percentage by weight: 0.06%-0.09% of C, 0.1%-0.5% of Si, 1.3%-2.0% of Mn, less than or equal to 0.015% of P, less than or equal to 0.002% of S, 0.03%-0.06% of Nb, 0.01%-0.02% of Ti, 0.025%-0.045% of Al, 0.001%-0.0016% of B, and the balance of Fe and inevitable impurities. The manufacturing method of the steel plate comprises the steps of smelting and casting, heating, two-stage rolling, cooling and slow cooling. According to the invention, a pure DQ cooling process and an after-cooling heap slow cooling self-tempering process are specifically adopted, the effect of alloy elements is fully exerted, and the performance required by the steel plate is achieved in a controlled rolling and reinforced cooling mode.

Description

technical field [0001] The invention belongs to the technical field of manufacturing 690Mpa high-strength steel plates, and in particular relates to a low-cost high-strength steel plate with a yield strength greater than 690 MPa and a manufacturing method thereof. Background technique [0002] At present, the production of 690MPa high-strength structural steel is mainly used in coal mining machinery, construction machinery and other industries. The production process generally adopts quenched and tempered state or TMCP+T state production, but the manufacturing cost of this process is relatively high. [0003] For example, the patent of publication number CN109055657A-"690MPa grade low-cost high-strength toughness bainitic steel plate and its production process" has a chemical composition weight percentage of C. The present invention discloses a 690MPa low-cost high-strength toughness bainitic steel plate and its production. Process, chemical composition and mass percentage o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C21D1/18C21D6/00C21D8/02C22C33/04B21B1/26B21B37/56B21B37/74B21C37/02
CPCC22C38/02C22C38/04C22C38/12C22C38/14C22C38/06C22C38/002C22C33/04C21D1/18C21D6/005C21D6/008C21D8/0205C21D8/0221B21C37/02B21B1/26B21B37/74B21B37/56
Inventor 刘卫航刘卫丽钟滨
Owner BAOSTEEL ZHANJIANG IRON & STEEL CO LTD
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