Self-protection flux-cored wire suitable for ultralow-temperature high manganese steel

Abstract

The invention relates to a self-protection flux-cored wire suitable for ultralow-temperature high manganese steel. According to the technical scheme, the self-protection flux-cored wire is composed of a carbon steel strip, a single-strand alloy welding wire and flux-cored powder. The carbon steel strip comprises the following chemical components: 0.03-0.05 wt% of C, 0.05-0.08 wt% of Si, 0.5-0.8 wt% of Mn, less than or equal to 0.005 wt% of P, less than or equal to 0.005 wt% of S and the balance of Fe. The single-strand alloy welding wire comprises the following chemical components: 0.3-0.6 wt% of C, 0.05-0.2 wt% of Si, 24-33 wt% of Mn, less than or equal to 0.003 wt% of P, less than or equal to 0.003 wt% of S and 4-7 wt% of Ni. The flux core powder comprises the following chemical components in percentage by weight: 40 to 50 percent of barium fluoride, 10 to 17 percent of rutile, 4 to 7 percent of aluminum powder and 2 to 6 percent of sodium fluoroaluminate. Among the three chemical components, the balance is Fe and inevitable impurities. Weld metal formed by the self-protection flux-cored wire suitable for the ultralow-temperature high-manganese steel has the characteristic of high toughness under the ultralow-temperature service condition, and the strength of the weld metal is matched with that of the ultralow-temperature high-manganese steel.

Description

technical field

[0001] The invention belongs to the technical field of flux-cored welding wire suitable for ultra-low temperature high manganese steel. It specifically relates to a self-shielding flux-cored welding wire suitable for ultra-low temperature high manganese steel. Background technique

[0002] Ultra-low temperature high manganese steel is based on the C-Mn-Cr main component system to obtain a highly stable austenite structure, with high elongation, low yield ratio, excellent low temperature performance at -196°C, non-magnetic and low welding costs, etc. , is a cutting-edge material for low-temperature service environments, and is expected to be widely used in liquid cargo tanks of LNG carriers, fuel tanks of LNG fuel ships, etc., and can realize Ni-reduced steel plates and greatly reduce construction costs.

[0003] Existing self-shielded flux-cored wire technology for ultra-low temperature high manganese steel has a problem of insufficient toughness, such as th...

Examples

Embodiment 1

[0039] A self-shielding flux-cored wire suitable for ultra-low temperature high manganese steel. The self-shielding flux-cored welding wire suitable for ultra-low temperature high manganese steel is composed of carbon steel strip, single-strand alloy welding wire and flux core powder; flux core powder is filled between the single-strand alloy welding wire and carbon steel strip, and the single-strand alloy welding wire The centerline of the carbon steel strip coincides with the centerline of the carbon steel strip.

[0040] The thickness of the ultra-low temperature high manganese steel plate described in this embodiment is 20mm. The chemical composition of the ultra-low temperature high manganese steel is: C 0.42wt%; Si 0.14wt%; Mn 23wt%; N 0.04wt%; P 0.003wt%; S 0.003wt%. The mechanical properties of the 25Mn ultra-low temperature steel are: the yield strength is 480MPa, the tensile strength is 760MPa, and the elongation is 40%; the impact energy at -196°C is 114J.

[0041...

Embodiment 2

[0047] A self-shielding flux-cored wire suitable for ultra-low temperature high manganese steel. The self-shielding flux-cored welding wire suitable for ultra-low temperature high manganese steel consists of a carbon steel strip, a single-strand alloy welding wire and flux core powder, the flux core powder is filled between the single-strand alloy welding wire and the carbon steel strip, and the single-strand alloy welding wire The centerline of the carbon steel strip coincides with the centerline of the carbon steel strip.

[0048] The thickness of the ultra-low temperature high manganese steel plate described in this embodiment is 20mm. The chemical composition of the ultra-low temperature high manganese steel is: C 0.44wt%; Si 0.15wt%; Mn 25wt%; N 0.05wt%; P 0.002wt%; S 0.002wt%. The mechanical properties of the 25Mn ultra-low temperature steel are: the yield strength is 493MPa; the tensile strength is 782MPa; the elongation is 42%; and the impact energy at -196°C is 125J....

Embodiment 3

[0055] A self-shielding flux-cored wire suitable for ultra-low temperature high manganese steel. The self-shielding flux-cored welding wire suitable for ultra-low temperature high manganese steel consists of a carbon steel strip, a single-strand alloy welding wire and flux core powder, the flux core powder is filled between the single-strand alloy welding wire and the carbon steel strip, and the single-strand alloy welding wire The centerline of the carbon steel strip coincides with the centerline of the carbon steel strip.

[0056] The thickness of the ultra-low temperature high manganese steel plate described in this embodiment is 20mm. The chemical composition of the ultra-low temperature high manganese steel is: C 0.48wt%; Si 0.20wt%; Mn 27wt%; N 0.07wt%; P 0.003wt%; S 0.002wt%. The mechanical properties of the 25Mn ultra-low temperature steel are: the yield strength is 507MPa, the tensile strength is 802MPa, the elongation is 44%; the impact energy at -196°C is 145J.

...

technical field

[0001] The invention belongs to the technical field of flux-cored welding wire suitable for ultra-low temperature high manganese steel. It specifically relates to a self-shielding flux-cored welding wire suitable for ultra-low temperature high manganese steel. Background technique

[0002] Ultra-low temperature high manganese steel is based on the C-Mn-Cr main component system to obtain a highly stable austenite structure, with high elongation, low yield ratio, excellent low temperature performance at -196°C, non-magnetic and low welding costs, etc. , is a cutting-edge material for low-temperature service environments, and is expected to be widely used in liquid cargo tanks of LNG carriers, fuel tanks of LNG fuel ships, etc., and can realize Ni-reduced steel plates and greatly reduce construction costs.

[0003] Existing self-shielded flux-cored wire technology for ultra-low temperature high manganese steel has a problem of insufficient toughness, such as th...

Examples

Embodiment 1

[0039] A self-shielding flux-cored wire suitable for ultra-low temperature high manganese steel. The self-shielding flux-cored welding wire suitable for ultra-low temperature high manganese steel is composed of carbon steel strip, single-strand alloy welding wire and flux core powder; flux core powder is filled between the single-strand alloy welding wire and carbon steel strip, and the single-strand alloy welding wire The centerline of the carbon steel strip coincides with the centerline of the carbon steel strip.

[0040] The thickness of the ultra-low temperature high manganese steel plate described in this embodiment is 20mm. The chemical composition of the ultra-low temperature high manganese steel is: C 0.42wt%; Si 0.14wt%; Mn 23wt%; N 0.04wt%; P 0.003wt%; S 0.003wt%. The mechanical properties of the 25Mn ultra-low temperature steel are: the yield strength is 480MPa, the tensile strength is 760MPa, and the elongation is 40%; the impact energy at -196°C is 114J.

[0041...

Embodiment 2

[0047] A self-shielding flux-cored wire suitable for ultra-low temperature high manganese steel. The self-shielding flux-cored welding wire suitable for ultra-low temperature high manganese steel consists of a carbon steel strip, a single-strand alloy welding wire and flux core powder, the flux core powder is filled between the single-strand alloy welding wire and the carbon steel strip, and the single-strand alloy welding wire The centerline of the carbon steel strip coincides with the centerline of the carbon steel strip.

[0048] The thickness of the ultra-low temperature high manganese steel plate described in this embodiment is 20mm. The chemical composition of the ultra-low temperature high manganese steel is: C 0.44wt%; Si 0.15wt%; Mn 25wt%; N 0.05wt%; P 0.002wt%; S 0.002wt%. The mechanical properties of the 25Mn ultra-low temperature steel are: the yield strength is 493MPa; the tensile strength is 782MPa; the elongation is 42%; and the impact energy at -196°C is 125J....

Embodiment 3

[0055] A self-shielding flux-cored wire suitable for ultra-low temperature high manganese steel. The self-shielding flux-cored welding wire suitable for ultra-low temperature high manganese steel consists of a carbon steel strip, a single-strand alloy welding wire and flux core powder, the flux core powder is filled between the single-strand alloy welding wire and the carbon steel strip, and the single-strand alloy welding wire The centerline of the carbon steel strip coincides with the centerline of the carbon steel strip.

[0056] The thickness of the ultra-low temperature high manganese steel plate described in this embodiment is 20mm. The chemical composition of the ultra-low temperature high manganese steel is: C 0.48wt%; Si 0.20wt%; Mn 27wt%; N 0.07wt%; P 0.003wt%; S 0.002wt%. The mechanical properties of the 25Mn ultra-low temperature steel are: the yield strength is 507MPa, the tensile strength is 802MPa, the elongation is 44%; the impact energy at -196°C is 145J.

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