A non-quenched and tempered high-strength steel plate resistant to large heat input welding and its manufacturing method

Abstract

The invention discloses a non-quenched-tempered high-strength steel plate resistant to large heat input welding and a manufacturing method thereof, and belongs to the field of low-alloy steel. According to the technical scheme adopted by the invention, the non-quenched-tempered high-strength steel plate resistant to large heat input welding is prepared from the following chemical components: Fe, C, Si, Mn, Ni, Nb, V, Ti, Ca, N, O and inevitable impurities, wherein in percentage by mass of the elements, 11.9-5.3C-0.91Mn-0.54Ni+0.46Si-0.73Nb+1.76V is greater than or equal to 9.92, and is smallerthan or equal to 10.68, and C / Nb+Ti / N is greater than or equal to 5.4, and is smaller than or equal to 6.9. The non-quenched-tempered high-strength steel plate has the beneficial effects that: the steel plate components are scientific and are reasonable in proportion, the process is easily controlled, performances of the produced steel plate are stable, comprehensive mechanical properties are excellent, low-temperature toughness of a welding heat affected zone during large heat input is excellent, welding efficiency is improved in a multiplying mode, energy consumption is relatively low, economical efficiency is good, the cost is low, industrial production is adapted, and the applied range is wide.

Description

technical field [0001] The invention belongs to the field of low-alloy steel, and in particular relates to a non-quenched and tempered high-strength steel plate resistant to large heat input welding and a manufacturing method thereof. Background technique [0002] With the continuous improvement of modern industrial level, steel structures such as bridges, buildings, ships, and containers are increasingly developing in the direction of large-scale, safety, durability, and economy. In steel structure manufacturing technology, the importance of efficient and economical high heat input welding technology is particularly prominent. This technology is mainly realized by welding methods such as multi-wire submerged arc welding, gas-electric vertical welding, electroslag welding, and narrow-gap submerged arc welding, among which multi-wire submerged arc welding and gas-electric vertical welding are the most common applications. Gas electric vertical welding is a new method of gas ...

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Problems solved by technology

[0004] In order to solve the current technical problem of poor toughness of steel plates after welding with high heat input, the present invention provides a non-quenched and tempered high-strength steel plate resistant to high heat input welding and its manufacturing method. The content of different alloy elements is scientifically proportioned to control the C, Nb , Ti, N and other contents, the technical scheme of manufacturing steel plates through smelting, thermomechanical rolling and cooling and tempering processes has achieved excellent mechanical properties of the manufactured steel plates, and can be welded under the conditions of high heat input of 50~200kJ / cm , still has good low temperature toughness, can be widely used in industrial fields such as containers, bridges, offshore platforms, etc., and the production process is simple and low cost

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