High-toughness gas protective welding wire for large-linear energy welding low-alloy steel

Abstract

The invention relates to a high-toughness gas protective welding wire for large-linear energy welding low-alloy steel. The technical scheme is that the welding wire comprises the following chemical components in percentage by weight: 0.02-0.12 percent by weight of C, 1.00-2.50 percent by weight of Mn, 0.05-0.50 percent by weight of Si, 0.03-0.30 percent by weight of Ti, 0.001-0.004 percent by weight of B, less than or equal to 0.50 percent by weight of Cr, less than or equal to 0.5 percent by weight of Mo, less than or equal to 0.025 percent by weight of S, less than or equal to 0.025 percentby weight of P, 0.03-0.3 percent by weight of two or three kinds of Ca, Mg and Ba and the balance of Fe and inevitable impurities. The high-toughness gas protective welding wire is manufactured by thefollowing steps: carry out steel making on molten iron or scrap steel or the molten iron and the scrap steel by adopting a converter or an electric arc furnace, and then refining and adjusting molteniron components, casting into square billets, and then rolling into coil rods and cold-drawing into welding wires by conventional processes. The prepared welding material has good metal welding toughness and high tensile strength and is suitable for the welding of low-alloy high-strength steel under the condition of large-linear energy welding condition of 100-800kj / cm.

Description

technical field

[0001] The invention belongs to the technical field of gas shielded welding wire. Specifically relates to a high-toughness gas-shielded welding wire for welding low-alloy steel with large input energy. Background technique

[0002] In the past 30 years, in order to improve the welding efficiency of large-scale engineering structures and ensure the safety and reliability of their use, single-side submerged arc welding, gas-electric welding, electroslag welding and other high-energy welding technologies with high welding efficiency have been adopted one after another. The traditional low-alloy high-strength steel has brought new problems, that is, the strength and toughness of the weld and the heat-affected zone (HAZ) of the welded coarse grain are deteriorated, and defects such as welding cold cracks are prone to occur. Therefore, the improvement of weld seam and HAZ toughness has become a hot spot and focus in the research and development of high-input energ...

Examples

Embodiment 1

[0018] A high-toughness gas-shielded welding wire for welding low-alloy steel with large input energy. The chemical composition and content of the gas shielded welding wire are: C is 0.02-0.06wt%, Mn is 2.00-2.50wt%, Si is 0.05-0.50wt%, Ti is 0.03-0.30wt%, and B is 0.001-0.004wt%. %, Cr≤0.5wt%, Mo≤0.5wt%, S≤0.025wt%, P≤0.025wt%, Ca and Mg are 0.03-0.1wt%, and the balance is Fe and unavoidable impurities.

[0019] According to the above composition, the molten iron is refined and adjusted by the converter after steelmaking, and then cast into a billet, then hot rolled into a wire rod according to the conventional process, and cold drawn into a welding wire.

[0020] The welding wire manufactured in this embodiment is used for high heat input welding of low alloy steel with a tensile strength of 700-800 MPa. The welding method is gas electric vertical welding, and the shielding gas is 80% Ar+20% CO 2 , The welding input energy is 600~800kJ / cm, and no heat treatment is performe...

Embodiment 2

[0022] A high-toughness gas-shielded welding wire for welding low-alloy steel with large input energy. The chemical composition and content of the gas shielded welding wire are: C is 0.08-0.12wt%, Mn is 1.50-2.00wt%, Si is 0.05-0.50wt%, Ti is 0.03-0.30wt%, and B is 0.001-0.004wt%. %, Cr≤0.5wt%, Mo≤0.5wt%, S≤0.025wt%, P≤0.025wt%, Mg and Ba are 0.05-0.15wt%, and the balance is Fe and unavoidable impurities.

[0023] According to the above composition, the electric arc furnace is used to refine the molten iron after steelmaking and adjust the composition of the molten steel, and then cast it into a billet, then hot roll it into a wire rod according to the conventional process, and cold draw it into a welding wire.

[0024] The welding wire manufactured in this embodiment is used for high heat input welding of low alloy steel with a tensile strength of 700-800 MPa. The welding method is submerged arc welding, and the shielding gas is 80% Ar+20% CO 2 , The welding input energy is...

Embodiment 3

[0026] A high-toughness gas-shielded welding wire for welding low-alloy steel with large input energy. The chemical composition and content of the gas shielded welding wire are: C is 0.04-0.08wt%, Mn is 1.00-1.50wt%, Si is 0.05-0.50wt%, Ti is 0.03-0.30wt%, and B is 0.001-0.004wt%. %, Cr≤0.5wt%, Mo≤0.5wt%, S≤0.025wt%, P≤0.025wt%, Ca and Ba are 0.1-0.2wt%, and the balance is Fe and unavoidable impurities.

[0027] According to the above composition, the scrap steel is refined and the composition of the molten steel is adjusted after steelmaking by a converter, and then cast into a billet, then hot rolled into a wire rod according to the conventional process, and cold drawn into a welding wire.

[0028] The welding wire manufactured in this embodiment is used for high heat input welding of low alloy steel with a tensile strength of 600-700 MPa. The welding method is gas electric vertical welding, and the shielding gas is 80% Ar+20% CO 2 , The welding input energy is 100~300kJ / c...

technical field

[0001] The invention belongs to the technical field of gas shielded welding wire. Specifically relates to a high-toughness gas-shielded welding wire for welding low-alloy steel with large input energy. Background technique

[0002] In the past 30 years, in order to improve the welding efficiency of large-scale engineering structures and ensure the safety and reliability of their use, single-side submerged arc welding, gas-electric welding, electroslag welding and other high-energy welding technologies with high welding efficiency have been adopted one after another. The traditional low-alloy high-strength steel has brought new problems, that is, the strength and toughness of the weld and the heat-affected zone (HAZ) of the welded coarse grain are deteriorated, and defects such as welding cold cracks are prone to occur. Therefore, the improvement of weld seam and HAZ toughness has become a hot spot and focus in the research and development of high-input energ...

Examples

Embodiment 1

[0018] A high-toughness gas-shielded welding wire for welding low-alloy steel with large input energy. The chemical composition and content of the gas shielded welding wire are: C is 0.02-0.06wt%, Mn is 2.00-2.50wt%, Si is 0.05-0.50wt%, Ti is 0.03-0.30wt%, and B is 0.001-0.004wt%. %, Cr≤0.5wt%, Mo≤0.5wt%, S≤0.025wt%, P≤0.025wt%, Ca and Mg are 0.03-0.1wt%, and the balance is Fe and unavoidable impurities.

[0019] According to the above composition, the molten iron is refined and adjusted by the converter after steelmaking, and then cast into a billet, then hot rolled into a wire rod according to the conventional process, and cold drawn into a welding wire.

[0020] The welding wire manufactured in this embodiment is used for high heat input welding of low alloy steel with a tensile strength of 700-800 MPa. The welding method is gas electric vertical welding, and the shielding gas is 80% Ar+20% CO 2 , The welding input energy is 600~800kJ / cm, and no heat treatment is performe...

Embodiment 2

[0022] A high-toughness gas-shielded welding wire for welding low-alloy steel with large input energy. The chemical composition and content of the gas shielded welding wire are: C is 0.08-0.12wt%, Mn is 1.50-2.00wt%, Si is 0.05-0.50wt%, Ti is 0.03-0.30wt%, and B is 0.001-0.004wt%. %, Cr≤0.5wt%, Mo≤0.5wt%, S≤0.025wt%, P≤0.025wt%, Mg and Ba are 0.05-0.15wt%, and the balance is Fe and unavoidable impurities.

[0023] According to the above composition, the electric arc furnace is used to refine the molten iron after steelmaking and adjust the composition of the molten steel, and then cast it into a billet, then hot roll it into a wire rod according to the conventional process, and cold draw it into a welding wire.

[0024] The welding wire manufactured in this embodiment is used for high heat input welding of low alloy steel with a tensile strength of 700-800 MPa. The welding method is submerged arc welding, and the shielding gas is 80% Ar+20% CO 2 , The welding input energy is...

Embodiment 3

[0026] A high-toughness gas-shielded welding wire for welding low-alloy steel with large input energy. The chemical composition and content of the gas shielded welding wire are: C is 0.04-0.08wt%, Mn is 1.00-1.50wt%, Si is 0.05-0.50wt%, Ti is 0.03-0.30wt%, and B is 0.001-0.004wt%. %, Cr≤0.5wt%, Mo≤0.5wt%, S≤0.025wt%, P≤0.025wt%, Ca and Ba are 0.1-0.2wt%, and the balance is Fe and unavoidable impurities.

[0027] According to the above composition, the scrap steel is refined and the composition of the molten steel is adjusted after steelmaking by a converter, and then cast into a billet, then hot rolled into a wire rod according to the conventional process, and cold drawn into a welding wire.

[0028] The welding wire manufactured in this embodiment is used for high heat input welding of low alloy steel with a tensile strength of 600-700 MPa. The welding method is gas electric vertical welding, and the shielding gas is 80% Ar+20% CO 2 , The welding input energy is 100~300kJ / c...