CN102554496A

CN102554496A - Metal powder flux-cored wire for high-strength steel

Info

Publication number: CN102554496A
Application number: CN2010105961740A
Authority: CN
Inventors: 蔡鸿祥; 庄石城
Original assignee: KUNSHAN GINTUNE WELDING CO Ltd
Current assignee: KUNSHAN GINTUNE WELDING CO Ltd
Priority date: 2010-12-20
Filing date: 2010-12-20
Publication date: 2012-07-11

Abstract

The invention discloses a metal powder flux-cored wire for high-strength steel, which comprises carbon steel sheath and a flux core with the filling ratio of 10-20%. The metal powder flux-cored wire is characterized in that in the overall weight percent of the wire, components in the flux core include 1.00-3.00% of Mn (manganese), 0.20-1.50% of Si (silicon), 0.005-0.050% of F (fluorine), 0-0.1% of Ti (titanium) and 0-0.004% of B (boron). The flux-cored wire is applicable to backing weld of the high-strength steel of an X80 pipeline, and when in welding, deposition efficiency is high, speed is high, arc is stable, splash is little, a welding bead is smooth and beautiful in appearance, and post-welding slag is little.

Description

High strength steel is used the metal powder type flux-cored wire

Technical field

The invention belongs to field of welding material, relate to the protective gas flux-cored wire used for welding, be specially adapted to the welding of X80 pipe line steel and use.

Background technology

Pipeline is carried and mainly to be used for the long-distance transportation oil and natural gas, has economy, safely, uninterruptedly and the distinguishing feature little to the environmental disruption degree, and therefore, countries in the world are all being greatly developed.For adapting to the complex geological condition and the climatic environment of carrying on the way, its development trend is high strength, high tenacity.

And in the welding of transfering natural gas from the west to the east two wires X80 steel, because this steel grade intensity is high, cold crack sensitiveness is bigger, does not allow to adopt cellulose type electrode to carry out the welding bead bottoming.

Summary of the invention

In order to address the above problem; The invention provides a kind of high strength steel and use the metal powder type flux-cored wire; This flux-cored wire is applicable to the bottoming welding of X80 pipeline high strength steel, and deposition efficiency is high when welding, speed is fast, arc stability, few, the smooth-going grace of welding bead outward appearance of splashing, postwelding slag are few.

The present invention for the technical scheme that solves its technical problem and adopt is: a kind of high strength steel is used the metal powder type flux-cored wire; Comprise carbon steel crust and medicine core; The packing ratio of medicine core is 10～20%, it is characterized in that: each composition is respectively with respect to the percentage composition of the gross mass of welding wire in the said medicine core: Mn:1.00～3.00%; Si:0.20～1.50%; F:0.005～0.050%; Ti:0～0.1%; B:0～0.004%.

As further technical scheme of the present invention:

In the said carbon steel crust, be benchmark with the steel band gross weight, C≤0.02%, P≤0.015%, S≤0.015%;

The protective gas of said flux-cored wire when welding is 75% Ar by volume content ₂With 25% CO ₂Form;

The protective gas of said flux-cored wire when welding is 95% Ar by volume content ₂With 5% O ₂Form.

The function analysis of each composition is following in the welding wire:

The Mn desulfurization, deoxidation, transition alloy elements improves weld strength and toughness simultaneously.

The main of Si is through the silicomanganese combined deoxidation with effect, the while transition alloy elements, and silicon also can improve slag fluidity, makes that the welding ripple is fine and smooth.

Ti is strong deoxidier, can be combined into solid-state form with N, reduces the gas in the weld seam, reduces the possibility of hardening of steel, can improve toughness by crystal grain thinning simultaneously.

Ti and the B's of trace can synergy; The less oxidation of Ti protection B; Form small oxide simultaneously, as the particle of heterogeneous nucleation, crystal grain thinning; B can suppress thick pro-eutectoid ferrite and promote tiny acicular ferrite to form, thereby on the basis of improving weld strength, does not reduce toughness.

The invention has the beneficial effects as follows:

1. adopt the lower steel band of low-carbon (LC) and impurity content to make flux-cored wire, can improve the degree of purity of weld metal, improve hot-cracking resistance, reduce weld fumes and splashing amount.

2. weld the deposition efficiency height, cost is low, and the ratio of alloyed powder and iron powder reaches more than 95% in the medicine core prescription, makes it have higher welding deposition efficiency and deposition rate, and when welding, does not have slag, can the multiple tracks welding.

The specific embodiment

A kind of high strength steel is used the metal powder type flux-cored wire, and it adopts the mild steel steel band of low P, S is welding wire parcel skin, utilizes medicine core transition alloy, uses general flux-cored wire to make production technology and makes, and packing ratio is 10%-20%.

Select cold-rolled strip for use, and adopt proportioning welding wire total quality composition like table 1:

Table 1: embodiment is drug core component 1.～6.

The welding wire line directly is 1.2mm, after above-mentioned flux-cored wire is processed, adopts dc reverse connection, voltage 28V, electric current 250A, stem elongation degree 18mm, translational speed 250mm/min.The weld seam mechanical performance is seen table 2.

Table 2 embodiment is gained weld seam mechanical performance 1.～6.

Claims

1. a high strength steel is used the metal powder type flux-cored wire, comprises carbon steel crust and medicine core, and the packing ratio of medicine core is 10～20%, it is characterized in that: each composition is respectively with respect to the percentage composition of the gross mass of welding wire in the said medicine core: Mn:1.00～3.00%; Si:0.20～1.50%; F:0.005～0.050%; Ti:0～0.1%; B:0～0.004%.

2. high strength steel according to claim 1 is used the metal powder type flux-cored wire, it is characterized in that: in the said carbon steel crust, be benchmark with the steel band gross weight, and C≤0.02%, P≤0.015%, S≤0.015%.

3. high strength steel according to claim 1 and 2 is used the metal powder type flux-cored wire, it is characterized in that: the protective gas of said flux-cored wire when welding is 75% Ar by volume content ₂With 25% CO ₂Form.

4. high strength steel according to claim 1 and 2 is used the metal powder type flux-cored wire, it is characterized in that: the protective gas of said flux-cored wire when welding is 95% Ar by volume content ₂With 5% O ₂Form.