CN105499836B

CN105499836B - Extraordinary carbon steel with middle carbon content deposited metal

Info

Publication number: CN105499836B
Application number: CN201410490944.1A
Authority: CN
Inventors: 傅卫; 乔国荣; 乔萍; 陈国喜; 浦海军
Original assignee: Shanghai Baosteel Industry Technological Service Co Ltd
Current assignee: Shanghai Baosteel Industry Technological Service Co Ltd
Priority date: 2014-09-24
Filing date: 2014-09-24
Publication date: 2019-04-23
Anticipated expiration: 2034-09-24
Also published as: CN105499836A

Abstract

The invention discloses a kind of extraordinary carbon steels with middle carbon content deposited metal, i.e. this welding rod includes core wire and coating, the core wire is medium carbon steel core, the recipe ingredient of the coating is rutile 7-12wt%, marble 42-48wt%, fluorite 18-22wt%, ferrosilicon 9-12wt%, electrolytic manganese 5-8wt%, high carbon ferro-chrome 1.5-2.8wt%, nickel powder 2-4wt%, ferrotianium 0.8-1.5wt%, molybdenum-iron 0.3-1.0wt%, surplus Fe.This welding rod is applied to the workpiece that substrate is medium carbon steel and is welded to connect, so that weld hardness is consistent with workpiece substrate after the thermally treated quenching of workpiece, it ensure that deposited metal has enough carbon contents, and there is preferable toughness and anti-crack ability, ensure that the welding quality of workpiece.

Description

Extraordinary carbon steel with middle carbon content deposited metal

Technical field

The present invention relates to welding material of metal more particularly to a kind of extraordinary carbon steel welderings with middle carbon content deposited metal Item.

Background technique

Welding rod is widely used in the welding of metal component, needs the occasion of surface hardening, such as steel in certain welded steel structures The technique roller of iron enterprise rolling mill production line, body of roll material is usually 45# steel or 50# steel, with such model roll of steel plate plate circle circle After weld, since usual wlding is generally low-carbon or ultralow carbon material, so that the structural constituent of weld seam differs very with body of roll substrate Greatly, weld hardness and the body of roll have a larger difference after causing the body of roll to quench, subsequent when implementing surface coated treatment to the body of roll, weld seam table There is obvious color difference in face, will affect the product quality of production.Therefore must use special wlding so that deposited metal have compared with High carbon content just can guarantee hardness and substrate basic one after weld seam quenching under certain welding procedure and heat treatment process It causes.And currently on the market and there is no the medium high carbon alloy wlding of such purposes, existing medium high carbon alloy wlding is only suitable for The surfacing welding in the wear-resisting field of surface overlaying, such as rich chromium cast iron welding rod.

Summary of the invention

Technical problem to be solved by the invention is to provide a kind of extraordinary carbon steel with middle carbon content deposited metal, This welding rod is applied to the workpiece that substrate is medium carbon steel and is welded to connect, so that weld hardness and workpiece base after the thermally treated quenching of workpiece Material is consistent, ensure that deposited metal has enough carbon contents, and have preferable toughness and anti-crack ability, ensure that workpiece Welding quality.

In order to solve the above technical problems, the present invention has the extraordinary carbon steel of middle carbon content deposited metal, the welding rod Including core wire and coating, the core wire is medium carbon steel core, and the recipe ingredient of the coating is rutile 7-12wt%, marble 42- 48 wt %, fluorite 18-22 wt %, ferrosilicon 9-12 wt %, electrolytic manganese 5-8 wt %, high carbon ferro-chrome 1.5-2.8 wt %, nickel powder 2-4 wt %, ferrotianium 0.8-1.5 wt %, molybdenum-iron 0.3-1.0 wt %, surplus Fe.

Further, the medium carbon steel core is 45# steel core or medium carbon alloy steel core.

Further, the medium carbon alloy steel core is the carbon constructional quality steel of trade mark 45Mn.

Since there is the present invention the extraordinary carbon steel of middle carbon content deposited metal to use above-mentioned technical proposal, i.e. this weldering Item includes core wire and coating, and the core wire is medium carbon steel core, and the recipe ingredient of the coating is rutile 7-12wt%, marble 42-48 wt %, fluorite 18-22 wt %, ferrosilicon 9-12 wt %, electrolytic manganese 5-8 wt %, high carbon ferro-chrome 1.5-2.8 wt %, Nickel powder 2-4 wt %, ferrotianium 0.8-1.5 wt %, molybdenum-iron 0.3-1.0 wt %, surplus Fe.This welding rod is applied to during substrate is The workpiece of carbon steel is welded to connect, so that weld hardness is consistent with workpiece substrate after the thermally treated quenching of workpiece, ensure that deposition gold Accessory has enough carbon contents, and has preferable toughness and anti-crack ability, ensure that the welding quality of workpiece.

Specific embodiment

The present invention has the extraordinary carbon steel of middle carbon content deposited metal, and the welding rod includes core wire and coating, described Core wire is medium carbon steel core, and the recipe ingredient of the coating is rutile 7-12wt%, marble 42-48 wt %, fluorite 18-22 Wt %, ferrosilicon 9-12 wt %, electrolytic manganese 5-8 wt %, high carbon ferro-chrome 1.5-2.8 wt %, nickel powder 2-4 wt %, ferrotianium 0.8- 1.5 wt %, molybdenum-iron 0.3-1.0 wt %, surplus Fe.

After the welding of this welding rod, the weight percent of obtained deposited metal main chemical compositions are as follows: C 0.25~ 0.55%, Si 0.3~1.5%, Mn 0.8~2.5%, Mo 0.2-1.4%, Ni 0.3-2.0%, Cr≤1.0%, S≤0.02%, P≤ 0.02%, 0.01~0.04% Ti, remaining is Fe；Wherein Cr, Mo, Ti, Ni can only have one or more of them and exist simultaneously. From obtained deposited metal composition as it can be seen that carbon content and the phosphorus content phase of workpiece substrate medium carbon steel in deposited metal Match, the scaling loss amount of carbon is considered under different welding procedures, deposited metal carbon content can be adjusted according to different demands, so that deposition is golden Belong to carbon content and is in 0.25%~0.55%.Silicon is effective deoxidant element in welding process, when deposited metal silicone content is less than When 0.3%, it is impossible to which abundant deoxidation makes in weld seam that there may be the welding defects such as stomata, slag inclusion, this is under such working condition Welding workpiece in absolutely not allow；When silicone content is excessively high, the toughness of Resistance of Weld Metal has damage, while suitable silicon Element and the cooperation of other elements are so that weld metal obtains a certain amount of syringe needle ferrite, bainite, stable retained austenite Tissue, so that weld seam be made to keep preferable toughness.Manganese is good deoxidization desulfuration element, and a certain amount of manganese content is beneficial to prevent The generation of HOT CRACK FOR WELDING P.The nickel being added in this welding rod can be improved by reducing dislocation low temperature skid resistance, refinement crystal grain The toughness of deposited metal, conducive to extremely stable retained austenite is formed in weld seam and reach toughening and improve crack resistance mesh 's.Titanium is strong deoxidant element, it and nitrogen, oxygen have very strong affinity, and being formed by TiN, TiO particle can be used as crystalline substance Core equally has the function of refining crystal grain, raising welding seam toughness, in deposited metal the content of titanium elements can be controlled in 0.01%~ In the range of 0.04%.Sulphur, P elements all have very big damaging effect to the toughness of deposited metal, contain so it should be reduced as far as possible It measures, sulphur, phosphorus content can be controlled in 0.02% or less in deposited metal.

As a specific embodiment, for this welding rod using 45# steel core as core wire, the specific chemical composition of the core wire is as follows Table: (weight percent)

Element

C

Si

Mn

S

P

Ni

Cr

Mo

Ti

Fe

Content

0.46

0.18

0.71

0.014

0.02

-

?

Surplus

The formula of electrode coating is as follows: (weight percent)

Composition	Rutile	Marble	Fluorite	Ferrosilicon	Electrolytic manganese	High carbon ferro-chrome	Nickel powder	Ferrotianium	Molybdenum-iron	Other (Fe)
											Content	9	45	20	10	6	1.5	3	1	0.4	Surplus

The preparation of welding rod is suppressed on common oil pressure type electrode extrusion press, is then dried through low temperature drying and high temperature.Weldering Before connecing again by welding rod after 350 DEG C × 3h baking for test piece for welding, test piece for welding is 45# steel plate, with a thickness of 20mm, welding slope Mouth size, sample position and test method etc. are implemented by standard GB/T/T5118 regulation.Welding condition is electric current Reverse power connection polarity, 17.5~20KJ/cm of weld heat input, 200 DEG C of preheating temperature or more, interlayer temperature is not less than preheating temperature Degree.Postwelding takes deposited metal to carry out ingredient inspection, and the chemical component of deposited metal is as follows: (weight percent)

Element	C	Si	Mn	S	P	Ni	Cr	Mo	Ti	Fe
											Content	0.45	0.51	1.02	0.008	0.001	0.35	0.3	0.21	0.02	Surplus

The test piece for welding is quenched after processing that weld hardness and matrix hardness are almost the same, while can be led to according to product requirement It crosses adjustment quenching technical and obtains different hardness, this quenching hardness is in HRC58 ± 2.

Weld hardness is unmatched with matrix after this welding rod solves the problems, such as welding structure quenching, the deposition gold welded The toughness and anti-crack ability of category can satisfy quenching demand.In addition, the welding rod applies also for the part of all kinds of medium carbon steel forge pieces Defect repair welding occasion has preferable application market demand.

Claims

1. a kind of extraordinary carbon steel with middle carbon content deposited metal, the welding rod includes core wire and coating, and feature exists In: the core wire is medium carbon steel core, and the recipe ingredient of the coating is rutile 7-12wt%, marble 42-48 wt %, fluorite 18-22 wt %, ferrosilicon 9-12 wt %, electrolytic manganese 5-8 wt %, high carbon ferro-chrome 1.5-2.8 wt %, nickel powder 2-4 wt %, titanium Iron 0.8-1.5 wt %, molybdenum-iron 0.3-1.0 wt %, surplus Fe；After the welding of this welding rod, obtained deposited metal composition Weight percent are as follows: C 0.25~0.55%, Si 0.3~1.5%, Mn 0.8~2.5%, Mo 0.2-1.4%, Ni 0.3- 2.0%, Cr≤1.0%, S≤0.02%, P≤0.02%, Ti 0.01~0.04%, remaining is Fe；Wherein Cr, Mo, Ti, Ni can only have Standby one or more of them exists simultaneously.

2. the extraordinary carbon steel according to claim 1 with middle carbon content deposited metal, it is characterised in that: in described Carbon steel core is 45# steel core or medium carbon alloy steel core.

3. the extraordinary carbon steel according to claim 2 with middle carbon content deposited metal, it is characterised in that: in described Carbon alloy steel core is the carbon constructional quality steel of trade mark 45Mn.