Large heat input welding 670MPa-grade steel plate and manufacturing method thereof

A large heat input welding and manufacturing method technology, applied in the field of steel and its manufacturing, can solve the problems of poor strength and toughness, welding cold cracks, etc.

Active Publication Date: 2021-09-10
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In order to improve the welding efficiency of large-scale engineering structures and ensure the safety and reliability of their use, single-sided submerged arc welding, gas-electric welding, electroslag welding and other high-input energy welding technol...

Method used

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  • Large heat input welding 670MPa-grade steel plate and manufacturing method thereof
  • Large heat input welding 670MPa-grade steel plate and manufacturing method thereof
  • Large heat input welding 670MPa-grade steel plate and manufacturing method thereof

Examples

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Effect test

Embodiment 1-6 and comparative example 1-4

[0047] The large heat input welding 670MPa grade steel plate of the present invention adopts the following steps to make:

[0048] (1) Smelting and casting;

[0049] (2) Rolling: heating the slab to 1050-1250°C for rolling, controlling the final rolling temperature to 900-1100°C, and cooling to below 400°C after rolling;

[0050] (3) Quenching + tempering heat treatment: the quenching heating temperature is 900-980°C, and then water quenching; the tempering heating temperature is 600-700°C.

[0051] The chemical composition and related process parameters of Examples 1-6 all meet the control requirements of the design specification of the present invention. Correspondingly, in Comparative Examples 1-4, the control arrangements have chemical components or related process parameters that fail to meet the design requirements of the invention.

[0052] Table 1 lists the mass percentage distribution of each chemical element in the high heat input welded 670MPa grade steel plates o...

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Abstract

The invention discloses a large heat input welding 670MPa-grade steel plate. The large heat input welding 670MPa-grade steel plate comprises the following chemical elements in percentage by mass: 0.08%-0.12% of C, 0.80%-1.20% of Mn, 0.2%-0.6% of Cr, 1.5%-1.9% of Ni, 0.3%-0.5% of Mo, 0.1%-0.3% of Cu, 0.02%-0.05% of V, 0.001%-0.01% of Al, 0.006%-0.012% of Ti, 0.0008%-0.0014% of B, 0.001%-0.006% of N and the balance of Fe and other inevitable impurities. In addition, the invention also discloses a manufacturing method of the large heat input welding 670MPa-grade steel plate. The manufacturing method comprises the following steps: (1) smelting and casting; (2) rolling; and (3) quenching and tempering thermal treatment, wherein the quenching heating temperature is 900-980 DEG C, and then water quenching is carried out; and the tempering heating temperature is 600-700 DEG C. The large heat input welding 670MPa-grade steel plate has good energy welding performance and aging impact performance, and can be effectively used as a welding structure material to be applied to the field of ocean engineering.

Description

technical field [0001] The invention relates to a metal material and a manufacturing method thereof, in particular to a steel material and a manufacturing method thereof. Background technique [0002] The offshore platform is a super-large welded steel structure located on the sea, and it is a landmark facility in marine resource development projects. Correspondingly, steel for offshore platforms plays the most important role in ensuring the safety of marine facilities as steel for engineering structures. Offshore platforms are used in severe marine working environments such as waves, sea tides, storms and extremely cold drift ice, and support drilling equipment with a total weight of more than hundreds of tons. These usage characteristics determine that steel for marine engineering needs to have performance indicators such as high strength, high toughness, fatigue resistance, good weldability, cold workability, and seawater corrosion resistance. [0003] The study found t...

Claims

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Application Information

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IPC IPC(8): C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46C22C38/50C22C38/54C21D1/25C21D8/02
CPCC22C38/04C22C38/44C22C38/42C22C38/46C22C38/50C22C38/54C22C38/06C22C38/001C21D1/25C21D8/0226C21D2211/002
Inventor 王毓男蒋晓放王睿之
Owner BAOSHAN IRON & STEEL CO LTD
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