CN1093025C

CN1093025C - High-toughness anticorrosion welding wire for submerged are welding of steel pipeline

Info

Publication number: CN1093025C
Application number: CN99112925A
Authority: CN
Inventors: 钱百年; 国旭明; 李晶丽; 刘权
Original assignee: Institute of Metal Research of CAS
Current assignee: Institute of Metal Research of CAS
Priority date: 1999-05-14
Filing date: 1999-05-14
Publication date: 2002-10-23
Anticipated expiration: 2019-05-14
Also published as: CN1273897A

Abstract

The present invention relates to a welding wire with high toughness and corrosion resistance for submerged arc weld. The present invention is characterized in that the welding wire has main chemical components (weight %) as following: 0.01 to 0.08% of C, 1.20 to 1.80% of Mn, 0.05 to 0.5% of Si, 0.03 to 0.15% of Ti, 0.001 to 0.008% of B, 0.20 to 0.55% of Mo, 0.20 to 0.5% of Cu, 0.03 to 0.5% of Ni, no more than 0.005% of S, no more than 0.01% of P and balancing Fe. Weld metal obtained from the present invention has high strength and toughness and is suitable for welding a natural gas transportation pipeline containing hydrogen sulfide.

Description

A kind of pipe line steel anticorrosive welding wire for submerged-arc welding of high tenacity

The invention belongs to field of welding material, be mainly used in submerged-arc welding, welding petroleum, natural gas transmission pipeline steel.

Oil, natural gas are the material bases of social development, are the chief components of national economy.It is estimated, to next century main energy sources be day hot gas, but China will reach 200,000,000 tons/year at the breach aspect oil, the natural gas, therefore except continuing to survey the oil gas field in control and exploitation east China and western part, also must be from the external input energy, set up from abroad to domestic feed-line and the transmission pipeline network of building oil, natural gas at home.Because feed-line often reaches thousands of kilometers, the region complexity in order to reduce the conveying cost, adopts the pipeline of high pressure, big throughput rate, big caliber to carry on the way.This has just proposed the requirement of high strength, high tenacity to tubing.Simultaneously, also require feed-line to have anti-H ₂The ability of S corrosion.Consider that the submerged-arc welding method is the main technique of spiral welded pipe and ERW tubulation, therefore, the weld seam that welding wire that requirement is adopted and solder flux coupling are welded into also must have very high intensity, toughness and good anti-H ₂The ability of S corrosion.At present, at the welding wire for submerged-arc welding of pipe line steel welding, domestic two patent CN1077152A and the CN1068528A of disclosing.Though the welding wire of CN1077152A invention has very high intensity and toughness,, be not suitable for the welding of natural gas transmission pipeline, and the low-temperature flexibility of CN1068528A is relatively low because carbon, manganese content are higher.

The object of the present invention is to provide a kind of pipe line steel anticorrosive welding wire for submerged-arc welding of high tenacity, weld metal therefrom not only has higher intensity and toughness, and can be suitable for the welding of sulfide hydrogen natural gas transmission pipeline.

The invention provides a kind of pipe line steel anticorrosive welding wire for submerged-arc welding of high tenacity, the chemical composition of welding wire (weight %) is:

C 0.01～0.08%, and Mn 1.20～1.80%, and Si 0.05～0.5%, and Ti 0.03～0.15%, and B 0.001～0.008%, and Mo 0.20～0.55%, and Ni 0.03～0.5%, and Cu 0.20～0.5%, S≤0.005%, and P≤0.01%, all the other are Fe.

Now chemical composition design considerations of the present invention is described below:

Adopt very low carbon content, reduced the hardness and the crackle Sensitivity Index of weld metal, improved the low-temperature flexibility of weld metal and the ability of anti-hydrogen crackle on the one hand, improved the ability of the hydrogen sulfide corrosion resistant of weld metal on the other hand.

S in the welding wire, P are harmful elements, contain heavyly when higher, can obviously reduce the toughness of weld metal and the ability of hydrogen sulfide corrosion resistant, so want strict its content of control.In the welding wire of the present invention, S, P are controlled to be (weight %): S≤0.005%, P≤0.01%.

Adding Mn, Mo element have improved the intensity of weld metal on the one hand by solution strengthening, Mn, Mo element have been postponed austenitic transition temperature on the other hand, suppressed the formation of pro-eutectoid ferrite and ferrite side plate, promote the formation of intracrystalline acicular ferrite, improved the low-temperature flexibility of weld metal.

Add microalloy element Ti, B.The affinity of Ti and oxygen is very big, forms TiO in weld seam, hinders on the one hand growing up of austenite crystal, refinement crystal grain, as the forming core particle of acicular ferrite, promoted the formation of acicular ferrite on the other hand.And the atomic radius of B is very little, and is very easily poly-partially to austenite grain boundary, reduced crystal boundary energy, the forming core that has suppressed pro-eutectoid ferrite with grow up, impel the generation acicular ferrite, improved the toughness of weld metal.Ti protects B not oxidized in weld seam.

Add minor N i, Cu and can stop hydrogen, reduced the sensitiveness of hydrogen being brought out crackle (HIC), improved anti-H to the weld metal internal penetration ₂The ability of S corrosion.

Welding wire of the present invention compared with prior art has following advantage:

1. welding wire of the present invention and alkalescent sintered flux coupling, the gained weld metal has very high intensity and low-temperature impact toughness, and is especially better with high basicity solder flux matching performance;

2. not preheating before the wire welding of the present invention, postwelding is applicable to single or multiple lift without heat treatment, the welding process requirement of single face or multiaspect;

3. the deposited metal combination property that welding wire of the present invention welded: σ _a=510～590MPa, σ _b=580～670MPa is with the CVN of the weld metal of high basicity solder flux coupling _{-10 ℃}=160J.

Embodiment

The chemical composition scope of welding wire according to the present invention adopts vacuum induction furnace smelting, and casting routinely then is rolled into φ 8.0 wire rods, after the annealing draw becomes the welding wire of 3.2mm.Four kinds of welding wires are listed in table 1 with the chemical composition of the deposited metal of solder flux SJ101 and SJ102 coupling gained respectively, and the mechanical performance of deposited metal is listed in table 2.

The chemical composition of table 1 embodiment welding wire deposited metal

Solder flux	The welding wire numbering	C	Si	Mn	Mo	Ti	B	Ni	Cu	S	P
Solder flux	The welding wire numbering	C	Si	Mn	Mo	Ti	B	Ni	Cu	S	P	SJ101	E1	0.056	0.47	1.59	0.30	0.006	0.0016	0.03	0.24	0.006	0.0017
E2	0.057	0.45	1.53	0.30	0.005	0.0016	0.05	0.37	0.0048	0.015			E1	0.056	0.47	1.59	0.30	0.006	0.0016	0.03	0.24	0.006	0.0017
E2	0.057	0.45	1.53	0.30	0.005	0.0016	0.05	0.37	0.0048	0.015	E3		0.035	0.37	1.58	0.29	0.004	0.0014	0.25	0.24	0.006	0.014
E4	0.045	0.40	1.39	0.29	0.002	0.0014	0.41	0.23	0.006	0.015	E3		0.035	0.37	1.58	0.29	0.004	0.0014	0.25	0.24	0.006	0.014
E4	0.045	0.40	1.39	0.29	0.002	0.0014	0.41	0.23	0.006	0.015	SJ102		E2	0.048	0.25	1.84	0.30	0.009	0.0010	0.06	0.37	0.0040	0.016
E3	0.025	0.09	1.85	0.32	0.009	0.0012	0.24	0.27	0.0047	0.015			E2	0.048	0.25	1.84	0.30	0.009	0.0010	0.06	0.37	0.0040	0.016

The mechanical performance of table 2 embodiment welding wire deposited metal

Solder flux	The welding wire numbering	σ _a(MPa)	σ _b(MPa)	δ(％)	ψ(％)	AKV _-10℃(J)
Solder flux	The welding wire numbering	σ _a(MPa)	σ _b(MPa)	δ(％)	ψ(％)	AKV _-10℃(J)	SJ101	E1	538	615	26	73	147
E2	547	620	24	72	153			E1	538	615	26	73	147
E2	547	620	24	72	153	E3		536	580	24	66	132.2
E4	506	586	24	74	134.4	E3		536	580	24	66	132.2
E4	506	586	24	74	134.4	SJ102		E2	586	668	24	71	174.4
E3	524	587	23	71	168.6			E2	586	668	24	71	174.4

Annotate: impact flexibility AKV is the mean value of five samples

Claims

1. a pipe line steel is with the anticorrosive welding wire for submerged-arc welding of high tenacity, and it is characterized in that: its main chemical compositions (weight %) is

C 0.01～0.08%, and Mn 1.20～1.80%, and Si 0.05～0.5%, and Ti 0.03～0.15%, and B 0.001～0.008%, and Mo 0.20～0.55%, and Cu 0.2～0.5%, and Ni 0.03～0.5%, S≤0.005%, and P≤0.01%, all the other are Fe.

2. the application of the anticorrosive welding wire for submerged-arc welding of the described pipeline usefulness high tenacity of claim 1 is characterized in that: use with alkaline agglutinant coupling.