Steel for welding with large heat input and method for improving toughness of heat affected zone

A technology of large heat input welding and heat affected zone, which can be used in the improvement of process efficiency, metal rolling, temperature control, etc., and can solve problems such as low toughness in the zone

Active Publication Date: 2022-07-08
LONGYAN UNIV
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Problems solved by technology

[0004] In order to solve the problem of low toughness in the heat-affected zone of the existing high-heat-input welding steel, the present invention provides a method for improving the toughness of the high-heat-input welding steel and its heat-affected zone

Method used

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  • Steel for welding with large heat input and method for improving toughness of heat affected zone
  • Steel for welding with large heat input and method for improving toughness of heat affected zone

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Embodiment Construction

[0029] A method for improving the toughness of the heat-affected zone of steel for welding with large heat input, the chemical composition of which is as follows: C: 0.08%, Si: 0.23%, Mn: 1.80%, Al: 0.035%, P: ≤ 0.015%, S: ≤ 0.013 %, Ti: 0.07%, B: 0.002, the balance is Fe, and the balance of Fe contains a small amount of inevitable impurities.

[0030] The above-mentioned method for improving the toughness of the heat-affected zone of steel for welding with large heat input, the specific steps are as follows:

[0031] (1) Smelting: According to the design of the components contained in the welding steel with large heat input, various raw materials are alloyed at 1600 ° C, molten steel is smelted, and ingots are obtained by pouring;

[0032] (2) Rolling: The steel ingot was heated to 1200 °C and kept for 2 h. After fully austenitizing, the steel ingot was subjected to 2 passes of rough rolling. The rough rolling temperature was 1100 °C and the final rolling temperature was 1050...

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Abstract

The invention discloses a steel for welding with large heat input and a method for improving the toughness of the heat affected zone. The scheme is controlled by reasonable component design, pouring, rolling and cooling process links, so that it forms fine and dispersed particles in the base metal. The inclusions of (Ti, Si, Al, Mn)O and MnS types are mostly between 0.5 μm and 2 μm in size, and with such inclusions as the core, a large number of elongated acicular ferrite (AF) are formed. structure, so that the base metal has higher mechanical properties. After welding with a large heat input of 200~800kJ / cm, the AF structure in the weld-affected zone (HAZ) was transformed into an equiaxed ferrite structure. The low-temperature impact toughness of HAZ at ‑40℃ did not decrease, but increased slightly, and the HAZ toughness Not affected by welding heat input, HAZ also has stable mechanical properties while greatly improving welding efficiency.

Description

technical field [0001] The invention belongs to the low-alloy high-strength steel welding technical field, and particularly relates to a large heat input welding steel and a method for improving the toughness of the heat-affected zone, which can improve the welding efficiency and improve the toughness of the heat-affected zone. Background technique [0002] In the field of large-scale equipment and machinery manufacturing such as shipbuilding, offshore platforms, and oil storage tanks, welding has been paid more and more attention as an important part of production and processing. With the large-scale and high-strength processing components, in order to improve welding construction efficiency and reduce manufacturing cost. In this context, large heat input welding methods such as gas-electric vertical welding, electroslag welding, and submerged arc welding are widely used in the related manufacturing fields of medium and heavy plates. However, when the welding heat input is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B1/22B21B37/74C22C38/00C22C38/02C22C38/04C22C38/06C22C38/14
CPCB21B1/22B21B37/74C22C38/02C22C38/04C22C38/06C22C38/14C22C38/002B21B2001/225Y02P10/20
Inventor 宋峰雨
Owner LONGYAN UNIV
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