Gas protective flux cored wire for welding vanadium-containing heat resistant steel

Abstract

The invention belongs to a metal powder type gas protective flux cored wire for welding vanadium-containing heat resistant steel. The metal powder type gas protective flux cored wire comprises low-carbon steel skin and a flux core, wherein the low-carbon steel skin comprises the following components in percentage by weight: 0.01 to 0.1 percent of C, 0.1 to 0.4 percent of Mn, 0.01 to 0.03 percent of Si, 0.005 to 0.015 percent of S, 0.005 to 0.015 percent of P and the balance of iron; the flux core accounts for 14 to 25 percent of the total weight of the welding wire and comprises the following components in percentage by weight: 1.2 to 3.0 percent of medium-carbon ferromanganese, 0.20 to 2.0 percent of ferrosilicon powder, 0.05 to 0.5 percent of magnesium powder, 1.5 to 2.0 percent of metal chromium powder, 0.2 to 2.0 percent of ferromolybdenum powder, 0.1 to 1 percent of ferrovanadium, 0.05 to 0.2 percent of electrically fused magnesia, 0.01 to 0.2 percent of fluoride and 7 to 15 percent of iron powder; and the components are mixed uniformly, the mixture is coiled on a thin steel strip to form strips, and the strips are drawn to form wires. The metal powder type gas protective flux cored wire has the characteristics of no molten slag on deposited metal after welding, capability of performing continuous multi-layer welding without slag removal, high welding speed, high efficiency and welding process property, stable electric arcs, small splatter, attractive appearance and the like, and vertical downward welding can be realized by short circuiting transfer.

Description

technical field

[0001] The invention belongs to welding wire for metal material welding production, in particular to a metal powder type gas shielded welding flux-cored welding wire for welding heat-resistant steel containing vanadium; the flux-cored welding wire is especially suitable for welding heat-resistant steel for 12Cr1MoVR type low-alloy containers And multi-layer continuous welding without cleaning slag. Background technique

[0002] 12Cr1MoVR steel is a pearlitic heat-resistant steel widely used all over the world. Its chemical composition: C: 0.08-0.15%, Mn: 0.40-0.70%, Si: 0.15-0.40%, Cr: 0.90-1.20%, Mo: 0.25- 0.35%, V: 0.15-0.30%, S≤0.010%, P≤0.025%, the balance is iron and unavoidable impurities; mechanical properties: tensile strength Rm: 440-590Mpa, yield strength ReL≥245Mpa, elongation Rate A≥19%, 20℃kv≥34J, it is the main steel grade used for superheater, header and main steam pipeline of high pressure, ultra high pressure and subcritical power station bo...

Examples

Embodiment 1

[0018] Embodiment 1: In this embodiment, a steel strip of (width×thickness) 14*0.9mm is used to make a metal sheath, and its chemical composition is C 0.04wt%, Mn 0.25wt%, Si 0.015wt%, S 0.01wt%, P 0.01wt% %, the surplus is iron, taking the preparation and production of 100Kg welding wire as an example, the present embodiment flux core accounts for 15wt% of the whole welding wire weight, and each composition in the flux core is: medium carbon ferromanganese 2.4Kg, ferrosilicon powder 1.0Kg, magnesium ( Mg) powder 0.2Kg, metal chromium (Cr) powder 1.5Kg, molybdenum iron powder 0.9Kg, vanadium iron powder 0.4Kg, fused magnesia 0.1Kg, fluoride (calcium fluoride) 0.2Kg, plus reduced iron powder 8.3Kg Until the total weight of the drug core ingredients is 15Kg; then mix the ingredients in the drug core evenly and set aside;

[0019] Put the steel strip in the welding wire forming machine, inject the ready-to-use flux core mixture into the groove of the steel strip that is bent tran...

Embodiment 2

[0026] Embodiment 2: the sheath of welding wire is identical with embodiment 1, is example with preparation and production 100Kg welding wire, and the flux core of present embodiment accounts for 20wt% of whole welding wire weight, and each composition is in the flux core: medium carbon ferromanganese 2.4Kg, ferrosilicon Powder 1.0Kg, magnesium (Mg) powder 0.2Kg, metal chromium (Cr) powder 1.5Kg, molybdenum iron powder 0.9Kg, vanadium iron powder 0.4Kg, fused magnesia 0.1Kg, calcium fluoride and potassium fluotitanate 0.2Kg (each 0.1Kg), add iron powder 13.3Kg to medicine core batching gross weight 20Kg; Stand-by after each composition in the medicine core is mixed then; All the other are identical with embodiment 1, it:

[0027] Chemical composition of deposited metal (%)

[0028] C

mn

Si

S

P

Cr

Mo

V

0.07

0.9

0.3

0.007

0.010

1.15

0.45

0.14

[0029] Mechanical properties o...

Embodiment 3

[0032] Embodiment 3: the sheath of welding wire is identical with embodiment 1, is example with preparation and production 100Kg welding wire, and the flux core of present embodiment accounts for 20wt% of whole welding wire weight, and each composition is in the flux core: medium carbon ferromanganese 2.4Kg, ferrosilicon Powder 1.0Kg, magnesium (Mg) powder 0.2Kg, metal chromium (Cr) powder 1.5Kg, molybdenum iron powder 0.9Kg, vanadium iron powder 0.4Kg, fused magnesia 0.1Kg, sodium fluoride and potassium fluotitanate 0.26Kg (each 0.13Kg), add atomized iron powder 13.24Kg to 20Kg of medicine core batching gross weight; Then each composition in the medicine core is mixed and stand-by;

[0033] Put the steel strip in the welding wire forming machine, inject the ready-to-use flux core mixture into the groove of the steel strip that is bent transversely into a "U" shape, and then roll it into a strip, and then draw it to the wire of Φ2.0mm. become.

[0034] In this embodiment, wel...

technical field

[0001] The invention belongs to welding wire for metal material welding production, in particular to a metal powder type gas shielded welding flux-cored welding wire for welding heat-resistant steel containing vanadium; the flux-cored welding wire is especially suitable for welding heat-resistant steel for 12Cr1MoVR type low-alloy containers And multi-layer continuous welding without cleaning slag. Background technique

[0002] 12Cr1MoVR steel is a pearlitic heat-resistant steel widely used all over the world. Its chemical composition: C: 0.08-0.15%, Mn: 0.40-0.70%, Si: 0.15-0.40%, Cr: 0.90-1.20%, Mo: 0.25- 0.35%, V: 0.15-0.30%, S≤0.010%, P≤0.025%, the balance is iron and unavoidable impurities; mechanical properties: tensile strength Rm: 440-590Mpa, yield strength ReL≥245Mpa, elongation Rate A≥19%, 20℃kv≥34J, it is the main steel grade used for superheater, header and main steam pipeline of high pressure, ultra high pressure and subcritical power station bo...

Examples

Embodiment 1

[0018] Embodiment 1: In this embodiment, a steel strip of (width×thickness) 14*0.9mm is used to make a metal sheath, and its chemical composition is C 0.04wt%, Mn 0.25wt%, Si 0.015wt%, S 0.01wt%, P 0.01wt% %, the surplus is iron, taking the preparation and production of 100Kg welding wire as an example, the present embodiment flux core accounts for 15wt% of the whole welding wire weight, and each composition in the flux core is: medium carbon ferromanganese 2.4Kg, ferrosilicon powder 1.0Kg, magnesium ( Mg) powder 0.2Kg, metal chromium (Cr) powder 1.5Kg, molybdenum iron powder 0.9Kg, vanadium iron powder 0.4Kg, fused magnesia 0.1Kg, fluoride (calcium fluoride) 0.2Kg, plus reduced iron powder 8.3Kg Until the total weight of the drug core ingredients is 15Kg; then mix the ingredients in the drug core evenly and set aside;

[0019] Put the steel strip in the welding wire forming machine, inject the ready-to-use flux core mixture into the groove of the steel strip that is bent tran...

Embodiment 2

[0026] Embodiment 2: the sheath of welding wire is identical with embodiment 1, is example with preparation and production 100Kg welding wire, and the flux core of present embodiment accounts for 20wt% of whole welding wire weight, and each composition is in the flux core: medium carbon ferromanganese 2.4Kg, ferrosilicon Powder 1.0Kg, magnesium (Mg) powder 0.2Kg, metal chromium (Cr) powder 1.5Kg, molybdenum iron powder 0.9Kg, vanadium iron powder 0.4Kg, fused magnesia 0.1Kg, calcium fluoride and potassium fluotitanate 0.2Kg (each 0.1Kg), add iron powder 13.3Kg to medicine core batching gross weight 20Kg; Stand-by after each composition in the medicine core is mixed then; All the other are identical with embodiment 1, it:

[0027] Chemical composition of deposited metal (%)

[0028] C

mn

Si

S

P

Cr

Mo

V

0.07

0.9

0.3

0.007

0.010

1.15

0.45

0.14

[0029] Mechanical properties o...

Embodiment 3

[0032] Embodiment 3: the sheath of welding wire is identical with embodiment 1, is example with preparation and production 100Kg welding wire, and the flux core of present embodiment accounts for 20wt% of whole welding wire weight, and each composition is in the flux core: medium carbon ferromanganese 2.4Kg, ferrosilicon Powder 1.0Kg, magnesium (Mg) powder 0.2Kg, metal chromium (Cr) powder 1.5Kg, molybdenum iron powder 0.9Kg, vanadium iron powder 0.4Kg, fused magnesia 0.1Kg, sodium fluoride and potassium fluotitanate 0.26Kg (each 0.13Kg), add atomized iron powder 13.24Kg to 20Kg of medicine core batching gross weight; Then each composition in the medicine core is mixed and stand-by;

[0033] Put the steel strip in the welding wire forming machine, inject the ready-to-use flux core mixture into the groove of the steel strip that is bent transversely into a "U" shape, and then roll it into a strip, and then draw it to the wire of Φ2.0mm. become.

[0034] In this embodiment, wel...

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